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Rogers, Jean Beyer, i Ellen K. Pikitch. "Numerical Definition of Groundfish Assemblages Caught Off the Coasts of Oregon and Washington Using Commercial Fishing Strategies". Canadian Journal of Fisheries and Aquatic Sciences 49, nr 12 (1.12.1992): 2648–56. http://dx.doi.org/10.1139/f92-293.
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Numerical definition of species caught together by the groundfish trawl fishery operating off the Oregon and Washington coasts during 1985–87 indicated six major assemblages of species. Observers on commercial vessels recorded data allowing estimation of the weights of commercially important species caught in each tow. Assemblages were selected based on consistencies in three types of analysis of the species weights: detrended correspondence ordination, two-way indicator species clustering, and Bray–Curtis group average clustering. Two of the assemblages were dominated by a single species, one consisting largely of smooth pink shrimp (Pandalus jordani) and the other primarily of widow rockfish (Sebastes entomelas). The other assemblages identified were a deepwater rockfish assemblage, a deepwater Dover sole assemblage, a nearshore mixed-species assemblage, and a bottom rockfish assemblage. These assemblages of commercially cooccurring species may be treated as units in developing mixed-species management plans. The deepwater rockfish assemblage we identify has not been previously described.
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Dinnis, Rob, i Damien Flas. "Trou du Renard and the Belgian Aurignacian". Proceedings of the Prehistoric Society 82 (13.05.2016): 1–25. http://dx.doi.org/10.1017/ppr.2016.4.
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A wealth of cave sites makes southern Belgium the most important area for understanding the north-western European Early Upper Palaeolithic. However, despite their abundance, the interpretation of many assemblages remains problematic. Here we present a new study of lithic material from layer B of Trou du Renard (Furfooz, Namur Province) and consider its place in the Belgian Aurignacian. The assemblage is typical of Late Aurignacian assemblages found across western Europe, underscoring the contrast between the Aurignacian and the periods that pre- and post-date it, when we instead see profound differences between north and south. The assemblage is apparently unmixed, distinguishing Trou du Renard from other key Belgian Aurignacian cave sites. A large proportion of the site’s lithic assemblage documents the production of small bladelets from carinated/busquéburin cores, suggesting that Trou du Renard served as a short-term hunting camp. Radiocarbon dating cannot pinpoint the assemblage’s age, though here it is argued to be c. 32–33,000bp(c. 36–37,000 calbp) on the basis of its similarity to the well-dated Aurignacian assemblage from Maisières Canal (Atelier de Taille de la Berge Nord-Estarea). For the same reason a third assemblage – Trou Walou layer CI-1 – is also argued to be contemporaneous. Trou du Renard, Maisières Canal and Trou Walou may represent three points in the same Late Aurignacian landscape. Differences between their lithic assemblages can be explained by the acquisition and transport of flint, and by a desire to produce small bladelets of highly standardised form irrespective of the size and shape of available blanks.
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Ito, Yoichi, Yuko Iijima, Naoyuki Itoh i Yuya Kimura. "Multilocus genotyping of Giardia duodenalis isolates from breeding cattery cats in Japan". Journal of Feline Medicine and Surgery Open Reports 3, nr 2 (lipiec 2017): 205511691774523. http://dx.doi.org/10.1177/2055116917745237.
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Objectives The present study reports the multilocus genotyping of Giardia duodenalis isolates from cats maintained in breeding catteries in Japan and discusses their potential for zoonotic transmission. Methods A total of 41 faecal samples positive for Giardia-specific antigen were procured from cats maintained in five breeding catteries and subjected to PCR to amplify four gene loci, namely small subunit ribosomal RNA ( SSU rRNA), glutamate dehydrogenase ( gdh), beta-giardin ( bg) and triose phosphate isomerase ( tpi ). The PCR-amplified DNA fragments were sequenced to determine the G duodenalis genotypes (synonym for assemblages). Results The most commonly occurring single assemblage was assemblage F (68.3%; n = 28/41), followed by assemblage A (12.2%; n = 5/41) and assemblage C (2.4%; n = 1/41). The mixed assemblages were identified as follows: assemblages F and A (9.8%; n = 4/41), assemblages F and C (4.9%; n = 2/41) and assemblages C and D (2.4%; n = 1/41). Additional sub-genotyping of assemblage A isolates based on three of the sequenced loci ( gdh, bg and tpi ) revealed that all eight isolates were identified as sub-assemblage AI and/or AII. Conclusions and relevance The present study is the first to report the detection of dog-adapted assemblages C and D in feline isolates from Japan. In addition, zoonotic sub-assemblage AI and human-adapted sub-assemblage AII were also identified. Thus, we concluded that the risk of transmission of G duodenalis from breeding cattery cats to humans is considerable and cannot be ignored.
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Mahon, Robin, Stephen K. Brown, Kees CT Zwanenburg, D. Bruce Atkinson, Kenneth R. Buja, Larry Claflin, Geoffrey D. Howell, Mark E. Monaco, Robert N. O'Boyle i Michael Sinclair. "Assemblages and biogeography of demersal fishes of the east coast of North America". Canadian Journal of Fisheries and Aquatic Sciences 55, nr 7 (1.07.1998): 1704–38. http://dx.doi.org/10.1139/f98-065.
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This study describes and maps demersal fish assemblages for the east coast of North America from Cape Hatteras, North Carolina, to Cape Chidley, Labrador, evaluates evidence for interannual shifts in assemblage distribution, and examines the relationship of the assemblages to accepted biogeographical boundaries. Demersal trawl survey data collected from 1975 to 1994 were analyzed. Visual classification of distribution maps for the 108 most abundant demersal species revealed nine species groups, based on both geography and depth distribution. Eighteen assemblage groups were identified using principal components analysis (PCA) and mapped. Assemblage groups were also identified by cluster analysis. Fish assemblages identified by both methods were spatially coherent. Assemblage distribution patterns were not consistent with accepted biogeographical boundaries. The PCA explained only 56.3% of the variance in distribution of the species, indicating that the assemblages should be interpreted as indeterminate, potentially adaptable entities rather than as rigid ecological constructs. Assemblages were persistent in composition through time but appeared to shift in location. The apparent looseness of the assemblages and their persistence through time in spite of severe impacts from fishing suggest that single-species management approaches may not be entirely inappropriate for the major groundfish species in the study area.
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García-Rodríguez, Mariano, Pere Abelló, Angel Fernández i Antonio Esteban. "Demersal Assemblages on the Soft Bottoms off the Catalan-Levante Coast of the Spanish Mediterranean". Journal of Marine Biology 2011 (2011): 1–16. http://dx.doi.org/10.1155/2011/976396.
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The analysis of 255 bottom trawl samples obtained in annual experimental surveys (2007–2010) along the western Mediterranean shows the existence of five well-defined demersal assemblages that follow a depth distribution: (a) upper shelf assemblages, including two assemblages differentiated by the type of substrate (sand-muddy and terrigenous muddy bottoms); (b) a middle shelf assemblage; (c) an upper slope assemblage; (d) a middle slope assemblage. Faunally, they are dominated by fish (37% of 452 total species), followed by crustaceans (22%), molluscs (17%), echinoderms (9%), and other invertebrates (15%). The assemblages identified showed major alterations on the shelf and shelf edge and less pronounced ones on the upper and middle slope. The average diversity values were more or less high, evidencing the high species richness in the western Mediterranean. The identified assemblages may facilitate future multispecies fisheries management based on an ecosystem approach.
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Pabis, Krzysztof, i Magdalena Błażewicz-paszkowycz. "Distribution and diversity of cumacean assemblages in Admiralty Bay, King George Island". Polish Polar Research 32, nr 4 (1.01.2011): 341–54. http://dx.doi.org/10.2478/v10183-011-0024-6.
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Distribution and diversity of cumacean assemblages in Admiralty Bay, King George IslandEleven species of cumaceans were found in 105 samples collected in Admiralty Bay (King George Island) in the summers of 1984/85 and 1985/86, from 20 to 500 m depth range. Four cumacean assemblages were distinguished using the multivariate analysis. They were characterized by the dominance of one or two species often with low density values. Two assemblages were found in open waters of Admiralty Bay. The first inhabited on sandy-clay-silt and silty-clay-sand bottom deposits in the depth range from 140 to 330 m, withCampylaspis maculata(1.6 ± 2.1 ind./0.1m2; F = 72.4%) andLeuconsp. (1.4 ± 1.6 ind./0.1m2; F = 68.9%) as key species. The second assemblage was found in the depth range from 50 to 120 m with silty-sand sediments, and it was characterized by the presence of Vauthompsonia inermis (6.5 ± 6.6 ind./0.1m2; F = 92.0%). A third assemblage was found in shallow waters influenced by glaciers in the bottom area of Ezcurra Inlet. It was characterized by sandy-clay-silt sediments and the presence ofEudorella splendida(14.6 ± 9.4 ind./0.1m2; F = 100.0%) as a core species. The last assemblage was found in the shallow sublittoral (50-100 m) of Ezcurra Inlet and the central basin, withDiastylis anderssoni armata(1.5 ± 1.1 ind./0.1m2; F = 85.7%) andDiastylopsis goekei(1.1 ± 1.0 ind./0.1m2; F = 71.4%) as the most frequent and abundant species.V. inermisis considered a eurytopic species with high frequency in the whole material, and was present in all four distinguished assemblages.E. splendidaandD. goekeiwere also recorded in each of the assemblages, but their total frequency was lower.
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Frezza, Virgilio, i Letizia Di Bella. "Distribution of recent ostracods near the Ombrone River mouth (Northern Tyrrhenian Sea, Italy)". Micropaleontology 61, nr 1-2 (2015): 101–14. http://dx.doi.org/10.47894/mpal.61.1.08.
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Ostracod assemblages of 52 samples, collected between 15 and 50m water depth on the Southern Tuscany continental shelf (Northern Tyrrhenian Sea), were analysed. A total of 68 species and 39 genera was determined. Q-mode cluster analysis performed on the 22 most abundant species (>5% in at least one sample) led to identification of clusters (and subclusters) corresponding to four distinct ostracod assemblages. The first assemblage is characterised by the high dominance of Cytheridea neapolitana and is probably linked to an organic matter enrichment, in silty clay bottom; the other three assemblages are more diversified and are dominated, with lower percentages, by species typical of infralittoral and circalittoral environments: C. neapolitana, Cytheropteron ruggierii and Loxoconcha subrugosa assemblage (on silty clay sediments), Pontocythere turbida assemblage (silty sand and silty clay substrates) and Loxoconcha ovulata assemblage (sandy clay and vegetated bottoms). The distribution of ostracod assemblages shows a good correlation with the benthic foraminiferal assemblages founded in the investigated area. Nevertheless, the recognised low diversity can be related to an organic matter enrichment.
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Siddon, Elizabeth C., Janet T. Duffy-Anderson, Kathryn L. Mier, Morgan S. Busby i Lisa B. Eisner. "Seasonal, interannual, and spatial patterns of community composition over the eastern Bering Sea shelf in cold years. Part II: ichthyoplankton and juvenile fish". ICES Journal of Marine Science 75, nr 1 (13.08.2017): 87–101. http://dx.doi.org/10.1093/icesjms/fsx123.
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Abstract Climate-mediated oceanographic changes have led to protracted periods of above- or below-average water temperatures over the eastern Bering Sea shelf since the early 2000s. Ecosystem components, from phytoplankton to marine birds, have shown dichotomous responses to these temperature stanzas. Understanding within-stanza responses is fundamental to modelling efforts that project ecosystem responses under future climate scenarios. This study describes fish communities associated with Walleye Pollock during the age-0 period and also examines within-stanza homogeneity of assemblages. Spatial patterns of assemblage structure are compared with pre-defined ecoregions and environmental indices are assessed to determine potential mechanisms that delineate species assemblages. Walleye Pollock, rockfishes, Sand Lance, and Northern Rock Sole contributed to spring assemblages in every year. Assemblages were delineated by across-shelf gradients in 2008 and 2010 while 2009 assemblages showed less spatial structure. In summer, the diversity of fish assemblages increased across years but early-stage juvenile Walleye Pollock represented a small portion of the total abundance in 2009. Environmental gradients were related to fish assemblages, but patterns were along-shelf in 2008 and across-shelf in 2010. In fall, late-stage juvenile Walleye Pollock dominated the catch in 2008, but did not typify any assemblage in 2009. Overall, patterns of assemblage structure were not consistent with pre-defined ecoregions. Assemblage structure in 2009 was unique and indicates that within-stanza variability may complicate modelling projections based on ecosystem-level responses to climate changes.
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Robinson, Clifford L. K., i Jennifer Yakimishyn. "The persistence and stability of fish assemblages within eelgrass meadows (Zostera marina) on the Pacific coast of Canada". Canadian Journal of Fisheries and Aquatic Sciences 70, nr 5 (maj 2013): 775–84. http://dx.doi.org/10.1139/cjfas-2012-0339.
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The persistence and stability of fish assemblages found in 34 eelgrass (Zostera marina) meadows along the British Columbia coast was examined from 2004 to 2011. Assemblage persistence (nontrending species composition) and assemblage stability (constancy in abundance over time) were assessed using a time-lag regression method that tests for temporal turnover within short time series. Overall, 85% of the fish assemblages persisted, and 80% of the assemblages exhibited stability in abundance over the 8-year study. Environmental conditions in 33 of 34 meadows did not change substantially over the 8 years, and the low interannual variability may have contributed to the high persistence and stability of the fish assemblages. The lack of temporal turnover in relatively undisturbed eelgrass fish assemblage properties is a critical element for effective monitoring of coastal ecosystem integrity.
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Zhang, Hui, Weiwei Xian i Shude Liu. "Autumn ichthyoplankton assemblage in the Yangtze Estuary shaped by environmental factors". PeerJ 4 (19.04.2016): e1922. http://dx.doi.org/10.7717/peerj.1922.
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This study investigated the response of the ichthyoplankton community to environmental changes in the Yangtze Estuary using canonical correspondence analysis. Ichthyoplankton community and environmental data were recorded during the autumns of 1998, 2000, 2002, 2003, 2004, 2007 and 2009. Among the ichthyoplankton, the dominant larval and juvenile families were the Engraulidae, Gobiidae and Salangidae, and the most common eggs were fromTrichiurus lepturus. The ichthyoplankton was identified via canonical correspondence analysis to three assemblages: an estuary assemblage dominated byChaeturichthys stigmatias, a coastal assemblage dominated byEngraulis japonicusandStolephorus commersonii, and an offshore assemblage dominated byTrichiurus lepturus. Regarding environmental factors in the Yangtze Estuary, suspended matter and surface seawater salinity were the main factors influencing the distributions of the different assemblages, while sediment from the Yangtze River during the rainy season and chlorophyllawere the principle drivers of the annual variances in the distribution of ichthyoplankton assemblages. Our aims in this study were to provide detailed characterizations of the ichthyoplankton assemblage in the autumns of seven years, examine the long-term dynamics of autumn ichthyoplankton assemblages, and evaluate the influence of environmental factors on the spatial distribution and inter-annual variations of ichthyoplankton assemblages associated with the Yangtze Estuary.
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Hewson, Ian, Danielle M. Winget, Kurt E. Williamson, Jed A. Fuhrman i K. Eric Wommack. "Viral and bacterial assemblage covariance in oligotrophic waters of the West Florida Shelf (Gulf of Mexico)". Journal of the Marine Biological Association of the United Kingdom 86, nr 3 (10.04.2006): 591–603. http://dx.doi.org/10.1017/s0025315406013506.
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Viruses are hypothesized to cause enhanced diversity in bacterial communities by regulating the outcome of intertaxon competition. However, concomitant documentation of viral and bacterial assemblage composition in oligotrophic waters are rare, particularly in situ over time, and there is almost no information on the temporal variability in virioplankton assemblage composition in oligotrophic water masses. Assemblage composition of viruses (via pulsed-field gel electrophoresis, PFGE) and bacteria (via automated rRNA intergenic spacer analysis, ARISA) was compared during surface lagrangian drifter deployments in the oligotrophic Gulf of Mexico during summer 2001, 2002, and 2003. In vertical profile, viruses and bacteria both had maximum abundances in surface waters, which decreased with depth; however, the richness of their assemblages was not significantly different between depths, suggesting independence of biomass and diversity. Viral assemblages changed rapidly (0.17–0.32 Jaccard index d−1), which was similar to the rate of change in bacterial assemblages reported in surface waters. Patterns of viral and bacterial assemblage composition were significantly related (P<0.001, r=0.58 between node ranks), and both assemblages clustered primarily by year and then by depth. These cultivation-independent observations demonstrate relationships between viral and bacterial assemblages, which are dynamic in patches of open ocean water. Even at the relatively low phylogenetic resolution of the ARISA and PFGE methods, the results support the idea that viruses may influence the species composition of host assemblages.
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Lee, Sangmin, Duck K. Choi i G. R. Shi. "Pennsylvanian brachiopods from the Geumcheon-Jangseong Formation, Pyeongan Supergroup, Taebaeksan Basin, Korea". Journal of Paleontology 84, nr 3 (maj 2010): 417–43. http://dx.doi.org/10.1666/09-105.1.
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We provide the first detailed systematic taxonomy and paleoecological investigation of late Paleozoic brachiopod faunas from Korea. Specifically, we focus on the brachiopods from the Geumcheon-Jangseong Formation, the lower part of the Pyeongan Supergroup in the Taebaeksan Basin. The formation yields a variety of marine invertebrate fossils, including brachiopods, molluscs, echinoderms, corals, fusulinids, and conodonts. Diverse brachiopods are described from six siliciclastic horizons of the formation at three localities, including 23 species belonging to 20 genera with two new species: Rhipidomella parva n. sp. and Stenoscisma wooi n. sp. Three brachiopod assemblages of the late Moscovian (Pennsylvanian) age are recognized based on their species compositions and stratigraphic distributions, namely the Choristites, Rhipidomella, and Hustedia assemblages. The brachiopod faunal composition varies within each assemblage as well as between the Assemblages, most likely reflecting local paleoenvironmental and hence paleoecological differences. The Choristites Assemblage includes relatively large brachiopods represented by Derbyia, Choristites, and Stenoscisma and may have inhabited open marine to partly restricted marine environments, whereas the Rhipidomella and Hustedia Assemblages consist of a small number of small-sized brachiopods living in lagoonal environments. The Choristites Assemblage shows a close affinity with Moscovian brachiopod assemblages in the eastern Paleo-Tethys regions, especially the Brachythyrina lata-Choristites yanghukouensis-Echinoconchus elegans Assemblage of North China, whereas the Rhipidomella and Hustedia assemblages both exhibit strong endemism.
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Michael, Pamela E., Kathy M. Hixson, Jeffery S. Gleason, J. Christopher Haney, Yvan G. Satgé i Patrick G. R. Jodice. "Migration, breeding location, and seascape shape seabird assemblages in the northern Gulf of Mexico". PLOS ONE 18, nr 6 (23.06.2023): e0287316. http://dx.doi.org/10.1371/journal.pone.0287316.
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The Gulf of Mexico supports many seabird species, yet data gaps describing species composition and habitat use are prevalent. We used vessel-based observations from the Gulf of Mexico Marine Assessment Program for Protected Species to identify and characterize distinct seabird assemblages in the northern Gulf of Mexico (within the U.S. Exclusive Economic Zone; nGoM). Using cluster analysis of 17 seabird species, we identified assemblages based on seabird relative density. Vessel-based surveys documented the location, species, and number of seabirds across the nGoM between 2017–2019. For each assemblage, we identified the (co-)dominant species, spatial distribution, and areas of greater relative density. We also assessed the relationship of the total relative density within each assemblage with environmental, spatial, and temporal covariates. Of the species assessed, 76% (n = 13) breed predominantly outside the nGoM basin. We identified four seabird assemblages. Two assemblages, one dominated by black tern and the other co-dominated by northern gannet/laughing gull, occurred on the continental shelf. An assemblage dominated by sooty tern occurred along the continental slope into pelagic waters. The fourth assemblage had no dominant species, was broadly distributed, and was composed of observations with low relative density (‘singles’ assemblage). Differentiation of assemblages was linked to migratory patterns, residency, and breeding location. The spatial distributions and relationships of the black tern and northern gannet/laughing gull assemblages with environmental covariates indicate associations with river outflows and ports. The sooty tern assemblage overlapped an area prone to mesoscale feature formation. The singles assemblage may reflect commuting and dispersive behaviors. These findings highlight the importance of seasonal migrations and dynamic features across the seascape, shaping seabird assemblages. Considering the potential far-ranging effects of interactions with seabirds in the nGoM, awareness of these unique patterns and potential links with other fauna could inform future monitoring, research, restoration, offshore energy, and aquaculture development in this highly industrialized sea.
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van de Vijver, Bart, i Louis Beyens. "Freshwater diatom communities of the Strømness Bay area, South Georgia". Antarctic Science 8, nr 4 (grudzień 1996): 359–68. http://dx.doi.org/10.1017/s0954102096000533.
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Modern diatom samples were collected from 43 sites across the Strømness Bay area of South Georgia. From 115 taxa belonging to 22 six diatom assemblages were distinguished. A CCA-analysis indicated that the assemblages are linked to pH and conductivity ranges, and habitat structure. The Eunotia paludosa var. paludosa - Eunotia subarcuatoides assemblage occurs in small acid water bodies. Samples of the Fragilaria germainii - Pinnularia aff. anglica assemblage are found in pools with a relatively high conductivity. The Fragilaria neoproducta assemblage and the Achnanthes subatomoides - Navicula vitabunda assemblage are mainly found in larger pools and lakes. This relationship between the assemblages and pH was comparable with results found in the testate amoebae fauna of South Georgia.
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Cuff, Jordan P., Shlomi Aharon, Igor Armiach Steinpress, Merav Seifan, Yael Lubin i Efrat Gavish-Regev. "It’s All about the Zone: Spider Assemblages in Different Ecological Zones of Levantine Caves". Diversity 13, nr 11 (10.11.2021): 576. http://dx.doi.org/10.3390/d13110576.
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Caves possess a continuum of ecological zones that differ in their microhabitat conditions, resulting in a gradient of nutrients, climate, and illumination. These conditions engender relatively rapid speciation and diverse assemblages of highly specialised spider fauna. It is unclear, however, how zonation of these caves affects spider assemblage composition and structure. Surveys of 35 Levantine caves were conducted to compare the assemblages of spiders between their different ecological zones. The diverse spider assemblages of these caves differed between the entrance, twilight, and dark zones, with troglophiles and accidental species occupying the cave entrance, endemic troglobites occupying the dark zones, and hybrid assemblages existing in the twilight zones. The progression of assemblage composition and divergence throughout cave zones is suggestive of processes of ecological specialisation, speciation, and adaptation of cave-endemic troglobites in the deepest zones of caves, while cave entrance assemblages are composed of relatively common species that can also be found in epigean habitats. Moreover, the cave entrance zone assemblages in our study were similar in the different caves, while the cave dark zone assemblages were relatively distinct between caves. Cave entrance assemblages are a subset of the regional species pool filtered by the cave conditions, while dark zone assemblages are likely a result of adaptations leading to local speciation events.
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Shott, Michael J. "Size Dependence in Assemblage Measures: Essentialism, Materialism, and “She” Analysis in Archaeology". American Antiquity 75, nr 4 (październik 2010): 886–906. http://dx.doi.org/10.7183/0002-7316.75.4.886.
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"Assemblage" is a fundamental archaeological construct. By their composition, we interpret assemblages as expressions of activity or cultural identity. Yet they are not simple products of these factors alone but also of formation processes. Assemblages accumulated over varying spans, with varying combinations of tool types and discard rates. They are contexts for the playing out of complex relationships, not static types. This is a materialist view, against the essentialist view that assemblages are exemplars of ideal types (e.g., "base camps," "Quina Mousterian"). Materialism implies that their size and composition, fundamental assemblage characteristics, are correlated variables, not fixed properties, and that composition varies as size increases. I document size dependence consistent with materialism in Paleoindian and Paleolithic assemblages. Among ways to analyze size-dependent assemblage data, I apply "SHE analysis"—the joint study of assemblage richness, heterogeneity, and evenness—to gauge data’s fit to theoretical models. Archaeologists acknowledge size dependence, but we misapprehend it as a methodological bias of assemblage measures that must be suppressed when, in materialist perspective, it reveals meaningful relationships that an essentialist view cannot.
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Hann, Rachel. "Transgendering-assemblages: Sin Wai Kin’s trans techniques and acts of boybanding". Critical Studies in Fashion & Beauty 15, nr 1 (1.06.2024): 75–97. http://dx.doi.org/10.1386/csfb_00073_1.
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This article investigates the artist Sin Wai Kin’s (單慧乾) speculative approach to drag through the prism of ‘transgendering-assemblages’. Influenced by the assemblage theory of Manuel DeLanda and Jasbir Puar, I propose that transgendering-assemblages actualize the properties of transness (Marquis Bey) through particular trans techniques (Grace E. Lavery). I introduce Sin’s more-than-human trans techniques, from make-up to costume, and approach to nonbinary storytelling to investigate identity assemblages more broadly. With explicit attention to their engagement with Chinese opera and Taoism, the speculative boyband in Sin’s Turner Prize nominated work It’s Always You (2021) prompts my proposal for ‘boybanding’ as a technique for investigating identity assemblages. The final section is focused on the genderings of East Asian masculinities in Sin’s work to argue how all gender-assemblages are also ‘racializing assemblages’ (Alexander G. Weheliye). I conclude with a provocation on what assemblage as a nonbinary concept (defined by what it does rather than what it is) can offer studies of gender.
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Srivastava, S. C. "Palynological correlation of coal seams in Godavari Graben, Andhra Pradesh, India". Journal of Palaeosciences 35, nr (1-3) (31.12.1986): 281–96. http://dx.doi.org/10.54991/jop.1986.1542.
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The palynological study of various coal seams from Yellandu, Kothagudem, Belampalli, Ramakrishnapuram and Ramagundam coalfields of Godavari Graben has been done. The distributional pattern of various palyno-taxa has suggested the occurrence of six miospore assemblages. Miospore Assemblage E is marked by the association of Parasaccites and Scheuringipollenites. Assemblage D is characterised by the dominance of Brevitriletes. In assemblages C1, C2 and C3, Brevitriletes is associated with Hennellysporites. Indotriradites, although rare, occurs only in this assemblage. Horriditriletes and Latosporites characterise Assemblage B in association with Brevitriletes Primuspollenites gains significance only at this stage of palynofloral succession. In the youngest Assemblage A all the triletes decrease appreciably giving way to nonstriate-disaccates, Scheuringipollenites, so as to take up the dominance. The sporological succession shows only one change after Assemblage E (Upper Karharbari) was deposited. Miospore assemblages D to A represent the Lower Barakar palynoflora.
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Crellin, Rachel J. "Changing Assemblages: Vibrant Matter in Burial Assemblages". Cambridge Archaeological Journal 27, nr 1 (11.01.2017): 111–25. http://dx.doi.org/10.1017/s0959774316000664.
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In this paper the notion of assemblage, as derived from the work of Gilles Deleuze, is explored in order to consider change in prehistory. An assemblage-based approach that draws on the concept of ‘vibrant matter’ is implemented as the means of understanding change. In this approach all materials are viewed as vibrant and in flux. These ideas are used to create a heterogeneous view of change where assemblages, or parts of assemblages, may change at varying speeds and rhythms and at many different scales. These ideas are explored through the case study of changing burial practices between 3000 and 1500 cal bc on the Isle of Man. I suggest that this kind of thinking allows us to study change differently, and explore the advantages of this approach for archaeology.
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McReynolds, A. T., M. L. Hoff, A. A. Sikora, C. I. Nau, M. J. Pietraszek, C. M. Bartelme, M. L. Christie, S. P. Hoffman, C. Hayer i P. S. Forsythe. "Adult and larval fish assemblages vary among small tributary mouths of Green Bay, Lake Michigan". Canadian Journal of Zoology 99, nr 4 (kwiecień 2021): 319–29. http://dx.doi.org/10.1139/cjz-2020-0143.
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Small tributaries of the Great Lakes serve as important habitat during critical life stages of many fish species, though temporal and spatial dynamics of the assemblage that uses these systems are seldom investigated. This study quantifies larval and adult fish assemblages captured by fyke net and light traps among small tributary mouths of Green Bay, Lake Michigan. Ten tributaries harbored a total of 45 species representing 17 families, with the most abundant including spottail shiner (Notropis hudsonius (Clinton, 1824)) in adult assemblages and white sucker (Catostomus commersonii (Lacepède, 1803)) in larval assemblages. Larval fish assemblage structures differed over five biweekly sampling events in May and June. Adult fish assemblage structures varied among tributaries but not among spring, summer, and fall samples. Larval and adult species assemblages at these river mouths are likely influenced by hydrology, habitat structure, and species-specific ecology. Water movement may transport larvae into river mouths, as larval assemblages were dominated by species that spawn in coastal habitats. Adult species richness varied with longitude, with the greatest diversity in tributaries on the west shore. This investigation of fish assemblages highlights the spatial and temporal variation that occurs in these systems and their role in shaping fish populations in Green Bay.
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Conneller, Chantal. "Commentary: Materializing Assemblages". Cambridge Archaeological Journal 27, nr 1 (11.01.2017): 183–85. http://dx.doi.org/10.1017/s0959774316000652.
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This contribution contrasts ‘Assemblage theory’ with more traditional archaeological understandings of the term ‘assemblage’. It is argued that the flat ontology of assemblage theory is productive, particularly in relation to scale, enabling archaeologists to describe their own materials more precisely. However, more traditional ‘assemblages’, perhaps as a result of the more restrictive view they provide, should not be neglected, as they generate particularly archaeological perspectives and effects.
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McClure, Eva, Laura Richardson, Alexia Graba-Landry, Zoe Loffler, Garry Russ i Andrew Hoey. "Cross-Shelf Differences in the Response of Herbivorous Fish Assemblages to Severe Environmental Disturbances". Diversity 11, nr 2 (13.02.2019): 23. http://dx.doi.org/10.3390/d11020023.
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Cross-shelf differences in coral reef benthic and fish assemblages are common, yet it is unknown whether these assemblages respond uniformly to environmental disturbances or whether local conditions result in differential responses of assemblages at different shelf positions. Here, we compare changes in the taxonomic and functional composition, and associated traits, of herbivorous reef fish assemblages across a continental shelf, five years before and six months after two severe cyclones and a thermal bleaching event that resulted in substantial and widespread loss of live hard coral cover. Each shelf position maintained a distinct taxonomic assemblage of fishes after disturbances, but the assemblages shared fewer species among shelf positions. There was a substantial loss of species richness following disturbances within each shelf position. Total biomass of the herbivorous fish assemblage increased after disturbances on mid- and outer-shelf reefs, but not on inner-shelf reefs. Using trait-based analyses, we found there was a loss of trait richness at each shelf position, but trait specialisation and originality increased on inner-shelf reefs. This study highlights the pervasiveness of extreme environmental disturbances on ecological assemblages. Whilst distinct cross-shelf assemblages can remain following environmental disturbances, assemblages have reduced richness and are potentially more vulnerable to chronic localised stresses.
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Nilsson, I. "Upper Palaeozoic fusulinid assemblages, Wandel Sea Basin, North Greenland". Rapport Grønlands Geologiske Undersøgelse 161 (1.01.1994): 45–71. http://dx.doi.org/10.34194/rapggu.v161.8243.
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Eight fusulinid assemblages are recognized in the Mallemuk Mountain Group of North Greenland. They are of late Moscovian (Wedekindellina assemblage), late Kasimovian (Rauserites ex. gr. simplex assemblage), early-middle Gzhelian (Rauserites ex. gro rossicus assemblage), late Gzhelian – ?early Asselian (Schellwienia arctica assemblage), early Asselian (Sphaeroschwagerina aff. S. vulgaris assemblage), middle-late Asselian (Schwagerina ex. gro nathorsti assemblage), latest Asselian - earliest Sakmarian (Schwagerina aff. S. moelleri – S. ex. gro exuberate assemblage) and late Sakmarian (Schwagerina plicatissima assemblage) ages. These assemblages show close similarities to faunas described elsewhere in the present Arctic region, i.e. Arctic Russia, Southwest Barents shelf, Svalbard and Arctic Canada.
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Lorenzo, María Inés, Juan M. Díaz de Astarloa, Walter Norbis i María B. Cousseau. "Long term fish assemblages as units of management in a temperate estuary (Rio de La Plata - SW Atlantic Ocean)". Brazilian Journal of Oceanography 59, nr 1 (marzec 2011): 43–59. http://dx.doi.org/10.1590/s1679-87592011000100004.
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Demersal fish assemblages from trawl surveys in the Rio de la Plata estuary and its inner continental shelf were analyzed from 1975 to 1995. The first two factors of Principal Component Analysis explained 48% of the variance in species distribution, and they are consistent with the results of a cluster analysis. The analysis indicated the existence of three spatially and temporally distinct fish assemblages: internal and external estuarine and inner continental shelf (Uruguayan coastal assemblages). These assemblages were persistent considering the environmental characteristics and their species composition. Despite the changes registered in the species density during the period surveyed, the fish assemblages tend to persist over time. It was demonstrated that the assemblages can be considered as open systems and that there exists a reciprocal flow of organisms between adjacent associations. However, each assemblage showed high spatial and temporal persistence in accordance with the environmental characteristics of the system analyzed. Therefore, and according to the multispecies fisheries operating in the system, each assemblage defined could be considered a unit of management.
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Brinkman, Donald B., i John A. Tarduno. "A Late Cretaceous (TuronianConiacian) high-latitude turtle assemblage from the Canadian Arctic". Canadian Journal of Earth Sciences 42, nr 12 (1.12.2005): 2073–80. http://dx.doi.org/10.1139/e05-074.
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Three turtles are present in a TuronianConiacian age high-latitude vertebrate assemblage from Axel Heiberg Island: Borealochelys axelheibergensis gen. et sp. nov., a generically indeterminate eucryptodire, and a trionychid. The assemblage differs from most Late Cretaceous turtle assemblages from North America in that members of the Paracryptodira are absent. The absence of this group is interpreted as a result of latitudinal differentiation of turtle assemblages in North America during the Late Cretaceous. The level of diversity of turtles in the Axel Heiberg assemblage is comparable to that of mid-latitude assemblages associated with a mean annual paleotemperature of 14 °C, adding to the evidence for high mean annual temperatures at high latitudes during TuronianConiacian times.
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Jones, Faith A. M., Maria Dornelas i Anne E. Magurran. "Recent increases in assemblage rarity are linked to increasing local immigration". Royal Society Open Science 7, nr 7 (lipiec 2020): 192045. http://dx.doi.org/10.1098/rsos.192045.
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As pressures on biodiversity increase, a better understanding of how assemblages are responding is needed. Because rare species, defined here as those that have locally low abundances, make up a high proportion of assemblage species lists, understanding how the number of rare species within assemblages is changing will help elucidate patterns of recent biodiversity change. Here, we show that the number of rare species within assemblages is increasing, on average, across systems. This increase could arise in two ways: species already present in the assemblage decreasing in abundance but with no increase in extinctions, or additional species entering the assemblage in low numbers associated with an increase in immigration. The positive relationship between change in rarity and change in species richness provides evidence for the second explanation, i.e. higher net immigration than extinction among the rare species. These measurable changes in the structure of assemblages in the recent past underline the need to use multiple biodiversity metrics to understand biodiversity change.
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Aguiar, Juliana Martins, Sheila Oliveira Silva, Valdir Azevedo dos Santos, Sueli Akemi Taniwaki, Tricia Maria Ferreira de Sousa Oliveira, Helena Lage Ferreira, Lara Borges Keid, Fábio Gregori i Rodrigo Martins Soares. "Evidence of heterozygosity and recombinant alleles in single cysts of Giardia duodenalis". Revista Brasileira de Parasitologia Veterinária 25, nr 2 (7.06.2016): 187–95. http://dx.doi.org/10.1590/s1984-29612016031.
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Abstract Giardia duodenalis is divided into eight assemblages (named A to H). Isolates of assemblage A are divided into four sub-assemblages (AI, AII, AIII and AIV). While isolates of sub-assemblage AII are almost exclusively detected in human hosts, isolates of assemblage B are encountered in a multitude of animal hosts and humans. Here, we isolated single cysts of G. duodenalis from a human stool sample and found that one of them had overlaps of assemblage AII and B alleles and an unexpectedly high number of variants of the beta-giardin (Bg) and GLORF-C4 (OrfC4) alleles. In addition, one of the Bg alleles of that cyst had a fragment of sub-assemblage AII interspersed with fragments of assemblage B, thus indicating that this allele may be a recombinant between sequences A and B. Our results are unprecedented and put a check on the statement that different assemblages of G. duodenalis represent species with different host specificities.
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Miranda, L. E., J. M. Bies i D. A. Hann. "Land use structures fish assemblages in reservoirs of the Tennessee River". Marine and Freshwater Research 66, nr 6 (2015): 526. http://dx.doi.org/10.1071/mf14188.
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Inputs of nutrients, sediments and detritus from catchments can promote selected components of reservoir fish assemblages, while hindering others. However, investigations linking these catchment subsidies to fish assemblages have generally focussed on one or a handful of species. Considering this paucity of community-level awareness, we sought to explore the association between land use and fish assemblage composition in reservoirs. To this end, we compared fish assemblages in reservoirs of two sub-basins of the Tennessee River representing differing intensities of agricultural development, and hypothesised that fish assemblage structure indicated by species percentage composition would differ among reservoirs in the two sub-basins. Using multivariate statistical analysis, we documented inter-basin differences in land use, reservoir productivity and fish assemblages, but no differences in reservoir morphometry or water regime. Basins were separated along a gradient of forested and non-forested catchment land cover, which was directly related to total nitrogen, total phosphorous and chlorophyll-a concentrations. Considering the extensive body of knowledge linking land use to aquatic systems, it is reasonable to postulate a hierarchical model in which productivity has direct links to terrestrial inputs, and fish assemblages have direct links to both land use and productivity. We observed a shift from an invertivore-based fish assemblage in forested catchments to a detritivore-based fish assemblage in agricultural catchments that may be a widespread pattern among reservoirs and other aquatic ecosystems.
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Chen, Zhaomin, Qingqiang Ren, Chunlong Liu i Weiwei Xian. "Seasonal and Spatial Variations in Fish Assemblage in the Yangtze Estuary and Adjacent Waters and Their Relationship with Environmental Factors". Journal of Marine Science and Engineering 10, nr 11 (7.11.2022): 1679. http://dx.doi.org/10.3390/jmse10111679.
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In this work, we identified the seasonal and spatial variations in fish assemblages and their relation to environmental variables in the Yangtze Estuary and adjacent waters. A total of 61 fish species in 32 families were identified over four seasons; of these, 12 species were dominant and Harpadon nehereus was the most dominant species. Fish varied in abundance, biomass, and species composition in different seasons; both biomass and abundance were highest in autumn and lowest in spring. Fish can be spatially divided into high-salinity assemblages and low-salinity assemblages. The spatial variation in fish assemblages was caused by the selectivity and adaptability of species for the environmental conditions of the estuary and the seasonal variation in fish assemblage structure likely resulted from migrations of dominant taxa associated with fish spawning and foraging behavior as well as the environment. The results of CCA analysis showed that temperature, depth, salinity, dissolved oxygen, and chlorophyll were the major factors affecting the fish assemblage differences throughout the seasons. Of these, temperature drove the seasonal variation in assemblage structure, while salinity significantly affected the spatial distribution of assemblages. This paper revealed the relationship between the seasonal and spatial distribution patterns of the fish assemblage and environmental factors and the results could provide a scientific basis for the management and sustainable utilization of fishery resources in the Yangtze Estuary and adjacent waters.
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Mohammad Rahimi, Hanieh, Ehsan Javanmard, Ali Taghipour, Ali Haghighi i Hamed Mirjalali. "Multigene typing of Giardia Duodenalis isolated from tuberculosis and non-tuberculosis subjects". PLOS ONE 18, nr 3 (23.03.2023): e0283515. http://dx.doi.org/10.1371/journal.pone.0283515.
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Giardia duodenalis is a cryptic protozoan, which has eight assemblages (A-H). Assemblages A and B are the main genotypes reported from humans with probable anthroponotic and zoonotic transmission. The current study aimed to characterize G. duodenalis assemblages in tuberculosis (TB) patients and healthy subjects using multilocus genotyping (MLG). Thirty Giardia-positive stool samples, which were obtained from TB patients and healthy subjects were included in the study. After total DNA extraction, three β-giardin (bg), triosephosphate isomerase (tpi), glutamate dehydrogenase (gdh) genes were amplified and sequenced. Obtained sequences were compared to the GenBank database to characterize assemblages. Phylogenetic analysis using Maximum Likelihood (ML) and Tamura 3-parameter was performed for each gene. From 30 Giardia-positive subjects, 17 (57%) and 13 (43%) were from healthy and TB-infected subjects, respectively. There was no significant co-existence of Giardia and tuberculosis (P-value = 0.051). In addition, 14 (46.7%) and 16 (53.3%) of Giardia isolates were from asymptomatic and symptomatic subjects, respectively. PCR amplification was successful in 25 single samples (83.3%) consisted of 20 for tpi, 15 for bg, and 13 for gdh genes. Accordingly, 13/25 (52%) and 8/25 (32%) belonged to assemblage A and assemblages B, respectively, whereas 4/25 (16%) were either assemblage A or B with different genes at the same time. Significant correlation between assemblages and TB, age, and symptoms was not seen. The phylogenetic analyses represented no separation based on TB and gastrointestinal symptoms. Assemblage A was the predominant genotype in samples. The high frequency of assemblage AII indicated importance of anthroponotic transmission of Giardia in both healthy and TB patients. In addition, considering the exclusive reports of sub-assemblage AIII in wild ruminants, the presence of AIII in the current study have to be carefully interpreted. The inconsistency between the assemblage results of either bg or gdh loci with tpi gene signifies the insufficiency of single gene analysis and the necessity for MLG in molecular epidemiology of G. duodenalis.
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Eastwood, Paul D., Sami Souissi, Stuart I. Rogers, Roger A. Coggan i Craig J. Brown. "Mapping seabed assemblages using comparative top-down and bottom-up classification approaches". Canadian Journal of Fisheries and Aquatic Sciences 63, nr 7 (1.07.2006): 1536–48. http://dx.doi.org/10.1139/f06-058.
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Acoustic technologies yield many benefits for mapping the physical structure of seabed environments but are not ideally suited to classifying associated biological assemblages. We tested this assumption using benthic infauna data collected off the south coast of England by applying top-down (supervised) and bottom-up (unsupervised) classification approaches. The top-down approach was based on an a priori acoustic classification of the seabed followed by characterization of the acoustic regions using ground-truth biological samples. By contrast, measures of similarity between the ground-truth infaunal community data formed the basis of the bottom-up approach to assemblage classification. For both approaches, individual assemblages were mapped by first computing Bayesian conditional probabilities for ground-truth stations to estimate the probability of each station belonging to an assemblage. Assemblage distributions were then interpolated over a regular grid and characterized using an indicator value index. While the two methods of classification yielded assemblages and output maps that were broadly comparable, the bottom-up approach arrived at a slightly better defined set of biological assemblages. This suggests that acoustically derived seabed data are not ideally suited to class ifying biological assemblages over unconsolidated sediments, despite offering considerable advantages in providing rapid and low-cost assessments of seabed physical structure.
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Chiba, Tomoki, Masaaki Shirai i Shin'ichi Sato. "Recognizing cryptic environmental changes by using paleoecology and taphonomy of Pleistocene bivalve assemblages in the Oga Peninsula, northern Japan". Quaternary Research 81, nr 1 (styczeń 2014): 21–34. http://dx.doi.org/10.1016/j.yqres.2013.10.015.
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AbstractMultivariate analyses applied to Pleistocene bivalve assemblages from the Oga Peninsula (northern Japan) discriminate three distinct assemblages. The assemblages and their taphonomy were used to recognize environmental settings and changes. The Astarte–Cyclocardia–Glycymeris assemblage indicates shelf environment (below the storm wave base) where gravels and shells are transported from shallower settings. Supply of the exotic coarse sediment probably enabled epifaunal bivalves to inhabit the sea floor. The Glycymeris assemblage is characterized by dominance of G. yessoensis and represents current-swept shoreface environment (above the storm wave base). The Moerella assemblage is characterized by bivalves inhabiting bay to open-marine conditions and diverse deposit-feeders, indicating a moderately land-locked environment, such as an open bay or a bay mouth. Fine-grained substrata rich in organic matters in the bay were probably suitable for the deposit-feeders. Ordination also shows the assemblages along two environmental gradients, a bathymetrical one and the other related to open-marine and bay conditions. The environmental changes are explained mainly by glacio-eustatic sea-level changes and alternation of coastal geomorphology caused by local crustal movements. This study also suggests that fossil assemblages can be a powerful tool to reconstruct environments and depositional dynamics even in intensely bioturbated sedimentary facies.
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Bartley, Paul M., Beeke K. Roehe, Sarah Thomson, Hannah J. Shaw, Frederieke Peto, Elisabeth A. Innes i Frank Katzer. "Detection of potentially human infectious assemblages of Giardia duodenalis in fecal samples from beef and dairy cattle in Scotland". Parasitology 146, nr 9 (6.07.2018): 1123–30. http://dx.doi.org/10.1017/s0031182018001117.
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AbstractThis study aimed to determine the prevalence and assemblages of Giardia duodenalis present in Scottish beef and dairy cattle at different ages, to try to ascertain if cattle could play a role in the spread of zoonotic assemblages of Giardia. A total of 388 fecal samples (128 beef and 253 dairy, seven of unknown breed) were collected from 19 farms in Scotland. Samples were sub-divided by host age, 1, 2, 3, 4, 5 and 6, 7–24 and ⩾25 weeks. DNA was extracted and tested by PCR to detect G. duodenalis DNA. Of the 388 samples, 126 tested positive, giving an overall prevalence of 32.5%, with positive samples being observed in all age groups tested. The prevalence in dairy cattle was 44.7% (113/235), which was significantly higher (P < 0.001) than the prevalence in beef cattle 10.1% (13/128). Sequence analysis demonstrated the presence of assemblage E (77.2%, sequence types E-S1–E-S5), assemblage B (18.2%) and assemblage A (sub-assemblages AI-AII) (4.6%). These data demonstrate that G. duodenalis is found routinely in both dairy and beef cattle throughout Scotland; the presence of assemblages A and B also indicates that cattle may play a role in the spread of potentially zoonotic assemblages of Giardia.
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Šmit, Iva, Dalibor Potočnjak, Vesna Matijatko, Marin Torti, Ines Jović, Darko Grden, Martina Crnogaj i Relja Beck. "The Influence of Giardia duodenalis on the Occurrence of Clinical Signs in Dogs". Veterinary Sciences 10, nr 12 (7.12.2023): 694. http://dx.doi.org/10.3390/vetsci10120694.
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Giardia duodenalis infections are common in dogs and are mainly caused by assemblages C and D. The aim of this study was to investigate the correlation between the presence of Giardia duodenalis and different Giardia assemblages detected in symptomatic and asymptomatic dogs and the occurrence of certain clinical signs. All the dogs included (n = 82) were clinically examined, and fecal samples were examined for other parasites and Clostridium spp. Also, G. duodenalis assemblages were detected and the occurrence of certain clinical signs was assessed. A total of 42/82 (51.2%) dogs were symptomatic and had one or more gastrointestinal signs, and 40/82 (48.8%) dogs were asymptomatic. G. duodenalis was found in 25/82 (30.5%) dogs: assemblage C in 10/25 (40%) and assemblage D in 15/25 (60%). Only Cryptosporidium spp. showed a higher coinfection rate with G. duodenalis but that did not have an influence on clinical sign appearance. There was no correlation between the presence of different assemblages of G. duodenalis and the sex of the host or the duration and appearance of certain clinical signs, except the presence of mucus in feces, which was more frequent in dogs invaded with G. duodenalis assemblage C. Further research of other assemblages is needed.
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Malins, Peta. "Machinic Assemblages". Janus Head 7, nr 1 (2004): 84–104. http://dx.doi.org/10.5840/jh20047139.
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The body conceived of as a machinic assemblage becomes a body that is multiple. Its function or meaning no longer depends on an interior truth or identity, but on the particular assemblages it forms with other bodies. In this paper I draw on the work of Deleuze and Guattari to explore what happens to the drug using body when it is rethought as a machinic assemblage. Following an exploration of how the body of the drug user is put together and stratified as a subject, and a careful manoeuvre through the bleak conception of the ‘drugged body’ provided by Deleuze and Guattari, I begin to map out some ethical alternatives. I argue that a body should, ultimately, be valued for what it can do (rather than what is essentially ‘is’), and that assemblages should be assessed in relation to their enabling, or blocking, of a body’s potential to become other.
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BREATHNACH, A. S., T. D. McHUGH i P. D. BUTCHER. "Prevalence and clinical correlations of genetic subtypes ofGiardia lambliain an urban setting". Epidemiology and Infection 138, nr 10 (10.02.2010): 1459–67. http://dx.doi.org/10.1017/s0950268810000208.
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SUMMARYThe clinical significance of different genetic subtypes or assemblages ofGiardia lambliais uncertain. Cases of giardiasis in south-west London between 1999 and 2005 were studied, comparing molecular-typing results with clinical and epidemiological findings from routine surveillance. We identified 819 cases, of whom 389 returned surveillance questionnaires. A subset of 267 faecal samples was submitted for typing by sequencing of the triose phosphate isomerase (tpi) and ribosomal RNA genes, and/or a separate duplex PCR of thetpigene. Typing was successful in 199 (75%) samples by at least one of the molecular methods. Assemblage A accounted for 48 (24%) samples and Assemblage B for 145 (73%); six (3%) were mixed. Both assemblages had similar seasonality, age distribution and association with travel. Clinical features were available for 59 successfully typed cases: both assemblages caused similar illness, but Assemblage A was significantly more frequently associated with fever than Assemblage B.
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Brugam, Richard B., Eric C. Grimm i Nancy M. Eyster-Smith. "Holocene Environmental Changes in Lily Lake, Minnesota Inferred from Fossil Diatom and Pollen Assemblages". Quaternary Research 30, nr 1 (lipiec 1988): 53–66. http://dx.doi.org/10.1016/0033-5894(88)90087-7.
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A postglacial core was taken from Lily Lake, a soft-water lake, located on carbonate-poor till in eastern Minnesota. Pollen analysis allowed the reconstruction of watershed vegetation change. Diatom assemblages from the core were compared with 255 surface sediment assemblages from Minnesota, Maine, Labrador, and the Canadian arctic. Late-glacial assemblages were similar to Canadian arctic lakes. During the mid-postglacial period of warmer and drier climate, fossil diatom assemblages at Lily Lake were similar to those in the surface sediment of modern eutrophic hardwater lakes in Central Minnesota. The shift to hardwater diatom assemblages coincided with a shift to prairie species in fossil pollen assemblages at about 8000 yr B.P. At about 3400 year B.P. the fossil diatom assemblage that characterized presettlement times was established.
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Crook, David A., i Wayne M. Koster. "Temporal change in fish assemblages in the lower Goulburn River, south-eastern Australia: comment on Pollino et al. (2004)". Marine and Freshwater Research 57, nr 3 (2006): 303. http://dx.doi.org/10.1071/mf05066.
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A recent analysis of fish assemblages in the Goulburn River, south-eastern Australia, used fish survey data collected between 1970 and 2002 to examine spatial patterns in the compositions and relative abundances of fish assemblages in the catchment. Based on this analysis, it was concluded that the native fish fauna of the Goulburn River is in a stressed condition and that introduced species dominate the fish assemblages. Fish survey data collected in 1982–1983 are compared with data collected in 2003–2004 to examine whether fish assemblages in the lower Goulburn River were stable at the temporal scale at which the data were aggregated in the previous analysis. The results show significant differences in fish assemblage composition between the two surveys, suggesting that fish assemblage structure in the lower Goulburn River did not remain stable between 1982–1983 and 2003–2004. The aggregation of data collected over several decades has the potential to confound analysis of spatial variations in fish assemblages and is unlikely to provide a reliable means of assessing their current condition.
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Izuka, Scot K., i Roger L. Kaesler. "Biostratinomy of ostracode assemblages from a small reef flat in Maunalua Bay, Oahu, Hawaii". Journal of Paleontology 60, nr 2 (marzec 1986): 347–60. http://dx.doi.org/10.1017/s0022336000021867.
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Comparisons of biotopes based on ternary plots and cluster analyses of living ostracode assemblages with those from subfossil assemblages from a small reef flat show that biostratinomic processes modify the assemblages before they are incorporated into the sediment of the reef flat. Selective preservation changes the assemblages by preferentially preserving robust carapaces over fragile carapaces. The thin-shelled Paradoxostomatidae, which are abundant in the algae-dwelling assemblages, are largely destroyed by biostratinomic processes and are represented by only a few individuals in the subfossil assemblages.Mixing of algae-dwelling assemblages and sediment-dwelling assemblages results in a lower relative proportion of many species in the subfossil assemblages than in the living assemblages. The Leptocytheridae, which comprise a large portion of the sediment-dwelling fauna, are reduced in relative proportion in the subfossil assemblages as a result of dilution of the sediment-dwelling fauna with an abundant, algae-dwelling fauna.Transportation of ostracode remains by wave-induced currents removes the patchiness that is characteristic of the biotopes of the living ostracode assemblages but does not completely homogenize the assemblage despite the close spacing of sampling and the small areal extent of the biotopes studied.
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Glasgow, DM, MJM Reichert i J. Quattro. "Effects of environmental factors on reef fish assemblage structure in the southeastern US Atlantic". Marine Ecology Progress Series 671 (5.08.2021): 147–63. http://dx.doi.org/10.3354/meps13764.
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Environmental variation influences fish assemblage structure; however, fish assemblage composition shifts due to natural or anthropogenic stressors have been observed in marine ecosystems worldwide, altering ecosystem structure and function, and fisheries sustainability. Previous research in waters off North and South Carolina (USA) was limited in scope and repeatability or did not quantify fish assemblages at a scale suitable for monitoring composition shifts. Concurrent chevron traps, underwater video, and environmental data from an annual fishery-independent survey were used to characterize the environment and enumerate demersal reef fishes caught in the traps, and priority fish species observed in video in depths ~15-110 m. Multivariate analyses detected assemblage patterns and environmental influences. An 8-variable (distance to shelf edge, depth, consolidated substrate size, latitude, percent biotic cover, temperature, undercut height, biotic class) model predicted assemblages, while 4 variables explained the greatest variation (distance to shelf edge [19%], depth [15%], consolidated substrate vertical relief [4%], size [4%]). The largest number of discriminator species occurred in mid- to outer shelf areas with greater substrate complexity (i.e. increasing substrate size and relief). Assemblages dominated by Centropristis striata at depths (~15-40 m) with little substrate complexity transitioned towards assemblages dominated by Pagrus pagrus, higher prevalence of larger-bodied predators, and invasive Pterois spp. at depths (~40-110 m) with greater substrate complexity. Understanding baseline assemblage characteristics and natural drivers of variability in fish assemblage structure is vital to conservation and management efforts that monitor changes in population abundance, the presence/absence of key species, and stressor-induced modifications of local assemblages, which are all measures of ecological health that underpin comprehensive assessments and management.
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Huazhang, Pan. "Namurian (Lower Carboniferous) gastropod assemblages from Ningxia, China". Journal of Paleontology 71, nr 4 (lipiec 1997): 599–609. http://dx.doi.org/10.1017/s0022336000040087.
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The Namurian Tsingyuan Formation from Ningxia, China, is divided into three members. The remarkably well-preserved gastropods from the Tsingyuan Formation belong to three assemblages: the Angyomphalus longicostatus—Glabrocingulum tongxinensis assemblage from the Lower Member; an assemblage of some siliceous Bellerophon sp., and Naticopsis sp. from the Middle Member; and the Euphemites hindi—Turbonitella semisulcatus assemblage from the Upper Member. Based on the associated ammonoids and conodonts, these assemblages are considered equivalent to the Eumorphoceras, Homoceras2-Reticuloceras1 and Reticuloceras2 zones of West Europe respectively.
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JAROS, DOROTA, WOJCIECH ZYGNER, SŁAWOMIR JAROS i HALINA WĘDRYCHOWICZ. "Detection of Giardia intestinalis Assemblages A, B and D in Domestic Cats from Warsaw, Poland". Polish Journal of Microbiology 60, nr 3 (2011): 259–63. http://dx.doi.org/10.33073/pjm-2011-036.
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Giardia intestinalis is a complex species divided into 7 assemblages (A - G). Two of them (A and B) are infective for both humans and animals. In cats four assemblages can occur: A, B, D, and F Assemblages A and B infect either cats, dogs and humans, assemblage D infects cats and dogs and assemblage F only cats. The purpose of this study was to determine the prevalence and genotypes of G. intestinalis in cats from Warsaw. From November 2006 to March 2007 a hundred sixty samples of stool were collected and examined by light microscopy. G. intestinalis cysts were detected in 3.75% of samples. DNA extracted from positive samples was used as template for PCR-RFLP using Giardia specific primers and the amplicons were sequenced. A comparison of the obtained DNA sequences with the Giardia sequences in the GeneBank database revealed assemblage A in 1.25% of the investigated cats, assemblage B in 1.25% and D in 1.25%.
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Van Dijk, Alina, Gabriel Nakamura, Arthur V. Rodrigues, Renan Maestri i Leandro Duarte. "Imprints of tropical niche conservatism and historical dispersal in the radiation of Tyrannidae (Aves: Passeriformes)". Biological Journal of the Linnean Society 134, nr 1 (14.06.2021): 57–67. http://dx.doi.org/10.1093/biolinnean/blab079.
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Abstract Speciation events occurring within biogeographic regions, and historical dispersal between regions influence diversity patterns observed in present-day assemblages. Such assessment has been often performed based on the phylogenetic structure of local assemblages. We underline some issues with that approach, and show that more reliable evaluation of historical events influencing present-day diversity can be achieved by combining phylogenetic diversity to an estimate of species assemblage age based on ancestral range estimation. We apply the new approach to test two concurrent hypotheses—Tropical Niche Conservatism (TNC) and Out of The Tropics (OTT)—which provide alternative explanations to species richness gradients, as possible explanations to higher species richness in tropical assemblages of Tyrannidae birds in relation to temperate ones across the American continent. Tropical assemblages tended to be older and to show higher phylogenetic diversity than temperate ones, suggesting that recent events of historical dispersal carried out by few lineages likely drove species assembly in younger temperate assemblages. This finding provides support to TNC as the most probable explanation to species richness variation in tyrannid assemblages across the Americas. Combining phylogenetic structure measures with a flexible assemblage age metric calculated from ancestral range estimation allows deeper understanding of current diversity gradients.
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Allmon, Warren D., i W. Burleigh Harris. "A new species of turritelline gastropod from a turritelline-dominated limestone in the Paleocene of North Carolina". Journal of Paleontology 82, nr 2 (marzec 2008): 442–46. http://dx.doi.org/10.1666/06-005.1.
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Turritelline Gastropods (family Turritellidae, subfamily Turritellinae; sensu Marwick, 1957) are common components of many Cretaceous to Recent benthic marine assemblages worldwide. They are frequently the dominant or even the sole macrofossil in such assemblages (Allmon, 1988), termed “turritelline- dominated assemblages” (TDAs; Allmon and Knight, 1993). They are defined as macrofaunal assemblages in which turritelline gastropods: 1) comprise either at least 20% of the total actual or estimated biomass or at least 20% of the macroscopic individuals in the assemblage, and 2) are at least twice as abundant as any other macroscopic species in the assemblage (Allmon, 2007). TDAs have been widely reported from siliciclastic and carbonate sediments of the U.S. Gulf and Atlantic Coastal Plains, but turritelline-dominated limestones (sometimes referred to as “turritella limestone” or “turritella rock”) appear to be limited to the Cretaceous and Paleogene (Allmon and Knight, 1993; Allmon, 2007; Allmon and Cohen, 2007).
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Máñez-Crespo, Julia, Fiona Tomas, Yolanda Fernández-Torquemada, Laura Royo, Fernando Espino, Laura Antich, Néstor E. Bosch i in. "Variation in Fish Abundance, Diversity and Assemblage Structure in Seagrass Meadows across the Atlanto-Mediterranean Province". Diversity 14, nr 10 (28.09.2022): 808. http://dx.doi.org/10.3390/d14100808.
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Seagrasses worldwide provide key habitats for fish assemblages. Biogeographical disparities in ocean climate conditions and seasonal regimes are well-known drivers of the spatial and temporal variation in seagrass structure, with potential effects on associated fish assemblages. Whether taxonomically disparate fish assemblages support a similar range of ecological functions remains poorly tested in seagrass ecosystems. In this study, we examined variation in the abundance, diversity (from a taxonomic and functional perspective), and assemblage structure of fish community inhabiting nine meadows of the seagrass Cymodocea nodosa across three regions in the Mediterranean (Mallorca and Alicante) and the adjacent Atlantic (Gran Canaria), and identified which attributes typifying the structure of meadows, and large-scale variability in ocean climate, contributed most to explaining such ecological variation. Despite a similar total number of species between Mallorca and Gran Canaria, the latter region had more taxonomically and functionally diverse fish assemblages relative to the western Mediterranean regions, which translated into differences in multivariate assemblage structure. While variation in the abundance of the most conspicuous fish species was largely explained by variation in seagrass structural descriptors, most variation in diversity was accounted for by a descriptor of ocean climate (mean seasonal SST), operating at regional scales. Variation in fish assemblage structure was, to a lesser extent, also explained by local variability in seagrass structure. Beyond climatic drivers, our results suggest that lower temporal variability in the canopy structure of C. nodosa meadows in Gran Canaria provides a more consistent source of food and protection for associated fish assemblages, which likely enhances the more abundant and diverse fish assemblages there.
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Rewers, Ewa. "The Sewn-Together Humanities". Er(r)go. Teoria - Literatura - Kultura, nr 47 (28.11.2023): 45–63. http://dx.doi.org/10.31261/errgo.14620.
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The purpose of this paper is a straightforward one: to step back from the increasing use of assemblage in recent debates and to attempt to take stock of what assemblage thinking offers to humanities. I relate the answer to this question to the title concept of “sewn-together” humanities, which has a tentative and ad hoc character. The starting point is the analysis of the video installation realized by Angela Melitopoulos and Maurizio Lazzarato, entitled Assemblages, which relies upon the concept of assemblages proposed by Gilles Deleuze and Félix Guattari. Assuming that research practices and theories combine assemblages of ideas of both abstract and practical nature, I analyse examples of the application of assemblage thinking and action at the levels of a method, methodology, and onto-epistemology, tracing the goals that humanities achieve by means of this approach to research.
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Porcic, Marko. "De facto refuse or structured deposition? House inventories of the late neolithic Vinca culture". Starinar, nr 62 (2012): 19–43. http://dx.doi.org/10.2298/sta1262019p.
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The goal of this paper is to determine whether there are reasons to believe that inventories from the Late Neolithic Vinca culture houses do not represent systemic assemblages and to offer an interpretation of household assemblage variation. Pottery inventories from Vinca culture houses were compared to the ethnographically recorded range of variation in household inventory size. The discard equation was used to make projections of the accumulated assemblages from house assemblages for comparison with empirically observed accumulated assemblages. It is concluded that in general there is no reason to reject the assumption that Vinca household inventories reflect systemic assemblages. Moreover, the patterns of inventory variability can be meaningfully interpreted in social terms.
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Kusmer, Karla D. "Taphonomy of owl pellet deposition". Journal of Paleontology 64, nr 4 (lipiec 1990): 629–37. http://dx.doi.org/10.1017/s0022336000042669.
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Remains derived from owl pellets are a major source of small-animal remains in paleontological and archaeological sites. Pellet remains are examined here to further develop workable strategies for extracting taphonomic information from microvertebrate assemblages. Study of the remains of three wild owl species yielded characteristic patterns of bone fragmentation and skeletal element representation. At the assemblage level, owl-derived assemblages are shown to differ quantitatively from other assemblages. The possible variability to be expected in owl-derived assemblages is examined and the patterns are contrasted with those produced by other depositional agents. The patterns can be useful in the identification of owl-deposited remains in some assemblages; however, overlap with patterns produced by other mechanisms may complicate analysis.
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Andrews, Julian E. "Jurassic clay mineral assemblages and their post-depositional alteration: upper Great Estuarine Group, Scotland". Geological Magazine 124, nr 3 (maj 1987): 261–71. http://dx.doi.org/10.1017/s0016756800016289.
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AbstractClay minerals from Middle Jurassic lagoonal mudrocks, siltstones and silty fine-grained sandstones of the upper Great Estuarine Group (Bathonian) are divided into four assemblages. Assemblage 1, the most common assemblage, is rich in mixed-layer illite–smectite with attendant illite and kaolinite. Assemblage 2 is dominated by smectitic clay. These assemblages are indicative of primary Jurassic deposition. Illite and kaolinite were probably derived from the weathering of older rocks and soils in the basin hinterland and were deposited in the lagoons as river-borne detritus. The majority of smectite and mixed-layer illite–smectite is interpreted as the argillization product of Jurassic volcanic dust, also deposited in the lagoons by rivers. Near major Tertiary igneous intrusions these depositional clay mineral assemblages have been altered. Assemblage 3 contains smectite-poor mixed-layer illite–smectite, whilst Assemblage 4 contains no smectitic clay at all. Destruction of smectite interlayers occurred at relatively shallow burial depths (< 2500 m) due to enhanced geothermal gradients and local convective hot-water circulation cells associated with the major Tertiary igneous intrusions.
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Pearman, T. R. R., Paul E. Brewin, Alastair M. M. Baylis i Paul Brickle. "Deep-Sea Epibenthic Megafaunal Assemblages of the Falkland Islands, Southwest Atlantic". Diversity 14, nr 8 (10.08.2022): 637. http://dx.doi.org/10.3390/d14080637.
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Deep-sea environments face increasing pressure from anthropogenic exploitation and climate change, but remain poorly studied. Hence, there is an urgent need to compile quantitative baseline data on faunal assemblages, and improve our understanding of the processes that drive faunal assemblage composition in deep-sea environments. The Southwest Atlantic deep sea is an undersampled region that hosts unique and globally important faunal assemblages. To date, our knowledge of these assemblages has been predominantly based on ex situ analysis of scientific trawl and fisheries bycatch specimens, limiting our ability to characterise faunal assemblages. Incidental sampling and fisheries bycatch data indicate that the Falkland Islands deep sea hosts a diversity of fauna, including vulnerable marine ecosystem (VME) indicator taxa. To increase our knowledge of Southwest Atlantic deep-sea epibenthic megafauna assemblages, benthic imagery, comprising 696 images collected along the upper slope (1070–1880 m) of the Falkland Islands conservation zones (FCZs) in 2014, was annotated, with epibenthic megafauna and substrata recorded. A suite of terrain derivatives were also calculated from GEBCO bathymetry and oceanographic variables extracted from global models. The environmental conditions coincident with annotated image locations were calculated, and multivariate analysis was undertaken using 288 ‘sample’ images to characterize faunal assemblages and discern their environmental drivers. Three main faunal assemblages representing two different sea pen and cup coral assemblages, and an assemblage characterised by sponges and Stylasteridae, were identified. Subvariants driven by varying dominance of sponges, Stylasteridae, and the stony coral, Bathelia candida, were also observed. The fauna observed are consistent with that recorded for the wider southern Patagonian Slope. Several faunal assemblages had attributes of VMEs. Faunal assemblages appear to be influenced by the interaction between topography and the Falkland Current, which, in turn, likely influences substrata and food availability. Our quantitative analyses provide a baseline for the southern Patagonian shelf/slope environment of the FCZs, against which to compare other assemblages and assess environmental drivers and anthropogenic impacts.