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Ross, Jason. "An investigation of the distribution patterns of aquatic vertebrates across four sites in the upper Parramatta River catchment /". View thesis View thesis, 2000. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030429.115844/index.html.
Pełny tekst źródła"A thesis submitted in part-fulfilment of the requirements for the degree of Master of Science (Honours)" Bibliography : leaves 131-152.
Giles, Jacqueline. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga". Thesis, Giles, Jacqueline (2005) The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga. PhD thesis, Murdoch University, 2005. https://researchrepository.murdoch.edu.au/id/eprint/39/.
Pełny tekst źródłaGiles, Jacqueline. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga". Giles, Jacqueline (2005) The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga. PhD thesis, Murdoch University, 2005. http://researchrepository.murdoch.edu.au/39/.
Pełny tekst źródłaBoomker, Jacob Diederik Frederik. "Parasites of some free-living wild animals and freshwater fish species in South Africa". Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-12032009-194518/.
Pełny tekst źródłaWishart, Marcus J. "A comparative phylogeographic approach toward defining functional units for the conservation of biodiversity in lotic ecosystems". Connect to this title online, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031125.103610/.
Pełny tekst źródłaScheuerell, Mark David. "Environmental drivers of spatial and temporal variability in lakes /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5144.
Pełny tekst źródłaSchilling, Emily Gaenzle. "Effects of Fish Introductions on the Geographic Distribution and Native Invertebrate Biodiversity of Naturally Fishless Lakes in Maine". Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/SchillingEG2008.pdf.
Pełny tekst źródłaRogers, Megan Bryn. "Woody debris and macroinvertebrate community structure of low-order streams in Colville National Forest, Washington". Connect to this title online, 2003. http://www.dissertations.wsu.edu/Thesis/Fall2003/m%5Frogers%5F121503.pdf.
Pełny tekst źródłaDe, Moor Irene J. "Methods for assessing the susceptibility of freshwater ecosystems in Southern Africa to invasion by alien aquatic animals". Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005145.
Pełny tekst źródłaJokela, Anneli. "Factors affecting the impact of invasive mussels on native freshwater mussels". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101146.
Pełny tekst źródłaCosta, Shirley Famelli da. "Ecologia reprodutiva e análise de viabilidade de uma população do cágado Hydromedusa maximiliani (Testudines, Chelidae) no Parque Estadual Carlos Botelho". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-26062009-150529/.
Pełny tekst źródłaThe reproductive strategies of Hydromedusa maximiliani at the Carlos Botelho State Park, SP, was verified by X-ray in females and juveniles between September 2007 and December 2008. Throughout the study two reproductive seasons were detected, both beginning in September. From a total of 33 X-rayed females, only 19 showed eggs, and three of them showed eggs in the two reproductive seasons. Clutch size varied from 1 to 3 eggs, but only one female presented one egg and another female presented three eggs. Clutch volume was 22128.01 ± 4939.8 mm³ (10493.422136.12 mm³; N = 44). Female body size was positively correlated to clutch volume, a pattern usually detected in chelonians. Reproductive information acquired in the present study together with population data available for H. maximiliani in the study site makes it possible a population viability analysis using the software VORTEX (version 9.92). A principal scenario (Real Population) was created based on life-history data collected throughout 10 years. In order to compare the protected area with an unprotected hypothetical area regarding the persistence of the population, this scenario was modified by altering some variables (10% increasing of mortality rate, 10% increasing of inbreeding depression, decreasing of carrying capacity), which generates a scenario named Hypothetical Isolated Population. Results were compared and sensitivity tests were carried out to verify the influence of variation in mortality ratio, catastrophes and inbreeding depression. There was a significant difference between the two scenarios (p = 0.0005). The extinction risk was 31% for Real Population and 90% for Hypothetical Isolated Population. The sensitivity analysis indicated that mortality ratio, deforestation, forest fires and inbreeding depression strongly influence the population survival. Long-term studies and biological information on species inhabiting areas subjected to anthropogenic impacts, like the Atlantic Rainforest, are vital to conservation actions, since they make it possible population viability analyses and the design of management strategies to threatened populations.
Hanson, John Mark 1955. "Patterns of animal abundance in lakes : the role of competition in the fish-macroinvertebrate relationship". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71975.
Pełny tekst źródłaWildsmith, Michelle Deanne. "Relationships between benthic macroinvertebrate assemblages and habitat types in nearshore marine and estuarine waters along the lower west coast of Australia /". Access via Murdoch University Digital Theses Project, 2007. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20081029.93910.
Pełny tekst źródłaBennett, Jewel Kay. "Bioassessment of irrigation drainwater effects on aquatic resources in the Klamath Basin of California and Oregon /". Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/5476.
Pełny tekst źródłaMabidi, Annah. "Freshwater invertebrate assemblages of the Eastern Cape Karoo region (South Africa) earmarked for shale gas exploration". Thesis, Nelson Mandela University, 2017. http://hdl.handle.net/10948/13713.
Pełny tekst źródłaChan, Matthew D. "Fish ecomorphology predicting habitat preferences of stream fishes from their body shape /". Diss., Connect to this title online, 2001. http://scholar.lib.vt.edu/theses/available/etd-05242001-183326.
Pełny tekst źródłaDoran, Bruce R. "The macroinvertebrate community of vernal pools in southwestern Québec /". Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29883.
Pełny tekst źródłaSeymour, Karen. "The influence of salmon presence on benthic communities in three Puyallup-White River tributaries". Online pdf file accessible through the World Wide Web, 2007. http://archives.evergreen.edu/masterstheses/Accession86-10MES/Seymour_K%20MESThesis.pdf.
Pełny tekst źródłaBeattie, Molly C. "Diet and familiarity influence on predator recognition by chemical cues in crayfish". Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1521577265172544.
Pełny tekst źródłaTörnblom, Johan. "A landscape approach towards ecological integrity of catchments and streams /". UUppsala : Dept. of Forest Products, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200870.pdf.
Pełny tekst źródłaKuehnl, Kody F. "Exploring Levels of Genetic Variation in the Freshwater Mussel Genus Villosa (Bivalvia Unionidae) at Different Spatial and Systematic Scales: Implications for Biogeography, Taxonomy, and Conservation". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253565660.
Pełny tekst źródłaCosta, Fabiano Gonçalves. "Testículo de Astyanax altiparanae Garutti e Britski, 2000. Estudo morfológico, ultraestrutural e imuno-histoquímico". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/42/42134/tde-26012012-111709/.
Pełny tekst źródłaThe Astyanax altiparanae (Characiformes, Characidae), popularly known as lambari, is a fish that has ecologic and economic importance. Morphological studies on testis of South American teleost species are not frequently found in the appropriated literature. The aim of this work was to show the changes in the morphology of the testis of Astyanax altiparanae occurred through the gonadal cycle. It was found five stages of the gonadal cycle: regressed, early maturation, mid maturation, late maturation and regression. Ultrastructural study, reveals that secretory cells showed a great amount of organelles responsible for macromolecules synthesis, and lipids droplets. Immunohistochemical studies reveal details of the distribution of androgen receptor, claudin-1, actin, cytokeratin, type I collagen fibers, laminin and fibronectin in this organ. This work demonstrated that males of Astyanax altiparanae were able to develop the intersex, once oocytes were found in the testis of some individuals.
Purrenhage, Jennifer Lyn. "Importance of Habitat Structure for Pond-Breeding Amphibians in Multiple Life Stages". Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1240957514.
Pełny tekst źródłaGinger, Luke J. "ONTOGENETIC CHANGES IN THE STOICHIOMETRY OF BLUEGILL UNDER CONTRASTING LIGHT AND NUTRIENT REGIMES". Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407430829.
Pełny tekst źródłaSoler, Vilaplana Patricia M. "Efectos de la contaminación sobre la biología y el comportamiento de dos ciprínidos autóctonos de la Península Ibérica". Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/674025.
Pełny tekst źródłaMediterranean rivers are subject to intense pollution of anthropic origin. Among the most frequent pollutants are ammonia and emerging compounds such as endocrine system disruptors (EDCs). This thesis has analyzed the effects of some of these pollutants on the reproduction and physiological stress of the Catalan chub (Squalius laietanus) and on the behavior of the Mediterranean barbel (Barbus meridionalis), two cyprinids native to the Iberian Peninsula. In field studies carried out in S. laietanus (Besòs river basin), EDCs such as benzotriazole and benzothiazole (coming from a textile industry) could be responsible for both a decrease in the gonadosomatic index (in both sexes) and a lower fecundity and spawn desynchronization (in females), as well as a smaller diameter in the seminiferous tubules of males. Higher levels of stress (cortisol) found in both blood and epidermal mucus, as well as the abnormalities detected in red and white blood cells of S. laietanus, were attributable to urban pollution from sewage treatment plants. In B. meridionalis, through experimental laboratory studies, it was shown that ammonia (at sublethal concentrations) altered feeding behavior (voracity and satiety), but not swimming activity. However, in fish that had been pre-exposed to ammonia (in the natural environment), these alterations occurred in absence of this compound. In another experiment, also carried out in B. meridionalis and aimed at investigating the effect of ammonia on the cognition, exposed fish were found to have poorer memory retention than non exposed ones. After a learning experience, individuals of this species were able to retain memory for at least 16 days, which is considered long-term memory.
Fabré, Mitjans Noëlle. "Comportamiento reproductor en el blenio de río (Salaria fluviatilis): aspectos relacionados con la estrategia reproductiva del macho". Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284359.
Pełny tekst źródłaThe river blenny (Salaria fluviatilis) is a freshwater fish inhabiting the circum-Mediterranean region that has been described as threatened in many of the countries where it occurs. In order to provide useful information for its conservation, in the present thesis, different aspects related to behaviour were approached: reproductive strategies, embryo development related to parental care, personality and learning capacity. Results concerning reproductive strategies show that the absence of larger dominant males promotes the secondary sexual characteristics (SSCs) development and the parental status acquisition in young males, while their presence inhibits these processes. Nest limitation, meanwhile, stimulates the cephalic crest growth. Embryo development study reveals that embryos maintained with progenitors have a major yolk sac volume, a minor head height and a minor jaw length at birth than the embryos maintained without progenitors. This suggests that the presence of both parents (specially the male, who has a close contact with clutches and exhibit parental care) could affect embryo development and therefore should be maintained in captivity programs. In the study about personality, it is explored if the time to emerge from a refuge when exposed to a novel environment is related to SSCs development. Males that emerge faster from the refuge present later, during reproductive period, a major development of the cephalic crest, and those who exit completely the refuge grow more in body length. Finally, in the spatial learning study, it is observed that males learn faster the task than females and their rapidity to learn is associated to the cephalic crest development. All these observations allow us to understand better how this species adapts to the environment and might provide relevant information for the conservation in situ, captive breeding and reintroduction programs.
Ligocki, Isaac Young. "Expanding Scales of Influence: Behavioral, Physiological, and Reproductive Implications of Relative Power within Social Groups". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428601259.
Pełny tekst źródłaRicciardi, Anthony. "The role of the zebra mussel (Dreissena polymorpha) in structuring benthic macroinvertebrate communities in the St. Lawrence River /". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34438.
Pełny tekst źródłaThe capacity for Dreissena to displace native freshwater mussels (Family Unionidae) in the St. Lawrence River was examined over a four year period by quadrat sampling at selected sites. Dreissena preferentially colonized unionid mussels in the river. Mean infestation loads (number of zebra mussels per unionid mussel) in the St. Lawrence were 10-100 times lower than in the Great Lakes,.but resulted in similar high mortality. Severe declines in unionid species richness and abundance occurred in areas of the river that supported dense Dreissena populations ($>$4,000 mussels/m$ sp2).$ Analysis of data from the Great Lakes-St. Lawrence River system suggests that mass mortality and extirpation of unionid populations typically occurs within 4-5 years following initial colonization of unionids by Dreissena, and that Dreissena infestation will increase the future tate of extinction of North American unionids by nearly 10-fold.
au, turtle111@aapt net, i Jacqueline Giles. "The underwater acoustic repertoire of the long-necked, freshwater turtle Chelodina oblonga". Murdoch University, 2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061121.103729.
Pełny tekst źródłaHellmann, Jennifer K. "Neighbor Effects: The Influence of Colony-level Social Structure on Within-group Dynamics in a Social Fish". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1464129648.
Pełny tekst źródłaMacKenzie, Wendy Marlene. "The effects of acid-base disturbances on branchial and renal calcium fluxes in the freshwater rainbow trout (Oncorhynchus mykiss)". Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9995.
Pełny tekst źródłaKitano, Shiori. "Effect of antidepressant fluoxetine on personality in the freshwater isopod Asellus aquaticus". Thesis, Linköpings universitet, Biologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148696.
Pełny tekst źródłaBannon, Henry James. "Effects of Water Quality Parameters on Prolonged Swimming Ability of Freshwater Fishes". The University of Waikato, 2006. http://hdl.handle.net/10289/2618.
Pełny tekst źródłaVenâncio, Fabrízio Alves. "Population biology of the freshwater crab Trichodactylus petropolitanus in the Córrego da Mina, Caçapava, SP: environmental monitoring from animal population studies". Universidade de Taubaté, 2005. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=216.
Pełny tekst źródłaO caranguejo de água doce Trichodactylus petropolitanus (Göldi, 1886), é uma espécie endêmica do Brasil com ocorrência nos Estados de Minas Gerais, Rio de Janeiro, São Paulo, Paraná e Santa Catarina, sendo que sua distribuição coincide amplamente com os domínios da quase extinta Mata Atlântica. Apesar de sua importância na cadeia trófica de sistemas lóticos (rios e riachos), pouco se conhece sobre a biologia dos caranguejos de água doce no Brasil. O conhecimento das necessidades básicas da fauna e as características peculiares de cada sistema e microhabitat ocupado podem gerar subsídios para o estabelecimento de planos de manejo e monitoramento ambiental. Dessa forma, o presente trabalho visa gerar informações sobre aspectos da biologia populacional e sobre o microhabitat ocupado por esta espécie em um pequeno riacho (231037S e 454128W), localizado em zona rural do município de Caçapava, SP. Coletas mensais foram realizadas de fevereiro de 2003 a janeiro de 2004 no período diurno. Estes caranguejos foram encontrados junto à vegetação marginal do córrego, principalmente entre os rizomas de Hedychium coronarium (lírio-do-brejo), uma macrófita aquática introduzida e considerada invasora de ambientes degradados. No presente trabalho foi detectado alguns aspectos da biologia destes caranguejos como: comportamento diferencial (jovens são mais ativos durante o dia), taxas de crescimento diferencial entre os sexos, sendo que machos alcançam a maturidade sexual (15┤18mm LC) em tamanhos menores que as fêmeas (> 21mm LC). Maior abundância da espécie foi observada nos meses mais quentes e chuvosos do ano, período em que pode estar concentrada as atividades reprodutivas devido à maior disponibilidade de água e áreas alagadas junto ao córrego. Como conclusão do presente trabalho, pode-se dizer que a população de T. petropolitanus apresenta-se estável no local de estudo e as macrófitas aquáticas parecem estar servindo de ferramenta ecológica para a manutenção da biodiversidade de rios e riachos, contribuindo para o estabelecimento de novos nichos.
Ontkos, Alex T. "Habitat Use of Three Abundant Predatory Fish Species in the Freshwater Marshes of the Florida Everglades". FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3873.
Pełny tekst źródłaVasconi, M. "FRESHWATER FISH OF NORTHERN ITALY: FROM THE VALORIZATION OF WILD UNEXPLOITED SPECIES TO NEW FARMING PERSPECTIVES". Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/232724.
Pełny tekst źródłaWaites, Anna R. "Plant-animal interactions and seed output of two insectpollinated herbs". Doctoral thesis, Umeå University, Ecology and Environmental Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-576.
Pełny tekst źródłaI combined comparative and experimental studies in the field and in the greenhouse to examine factors influencing reproductive success in two insect-pollinated herbs, the tristylous, selfincompatible perennial Lythrum salicaria and the self-compatible, biennial Pedicularis palustris. More specifically, I explored (i) the effects of plant population characteristics on the intensity and outcome of interactions with pollinators and seed predators, (ii) whether flower morphology affects duration of stigma receptivity, and (iii) whether damage-induced reduction in floral display reduces pollinator visitation and increases pollen limitation.
As predicted, the rate of pollinator visitation tended to increase and the number of flowers probed per plant tended to decrease with increasing population size in L. salicaria, but these relationships only approached statistical significance. By taking advantage of the pollen size polymorphism that is typical of many heterostylous plants, I could show that the number of compatible pollen grains received increased with population size, and that this was associated with a reduction in pollen limitation and increased seed output per flower. The deposition of high numbers of incompatible conspecific and heterospecific pollen grains did not appear to reduce seed set.
In P. palustris, fruit set and seed predation varied markedly among populations and years, but this variation could only partly be explained by variation in population size. Fruit set was positively related to population size, and seed predation was negatively related to population size, in one of three years. Similarly, the level of pollen limitation, which was quantified in two years, varied among populations, but was not related to population size, density or isolation.
In L. salicaria, both the duration of stigma receptivity and the effect of prior self-pollination on seed output varied among style morphs. These differences may contribute to morph-specific differences in pollen limitation and seed production documented in the field.
The results of a field experiment demonstrated that damage to the shoot apex may markedly reduce fruit production in L. salicaria, and suggested that this is mainly because damage reduces flower number. I found no evidence that a reduced floral display increased the severity of pollen limitation.
Taken together, the results show that interactions with both pollinators and herbivores may markedly affect reproductive output in the two plant species, and that the intensity of both mutualistic and antagonistic interactions vary considerably in space and time. Moreover, they are consistent with the hypothesis that pollination success should depend less on population size in selfcompatible than in self-incompatible plants.
Blawut, Bryan Joseph. "Assisted Reproduction Techniques’ Effects on Sperm Physiology of the Freshwater Fish, Sauger (Sander canadensis)". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1607012858031537.
Pełny tekst źródłaBurnham, Quinton. "Systematics and biogeography of the Australian burrowing freshwater crayfish genus Engaewa Riekk (Decapoda: Parastacidae)". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2014. https://ro.ecu.edu.au/theses/1278.
Pełny tekst źródłaPopejoy, Traci Glyn. "Zooarchaeology and Biogeography of Freshwater Mussels in the Leon River During the Late Holocene". Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801918/.
Pełny tekst źródłaDaniels, Savel R. (Savel Regan). "Systematics and population genetics of the South African freshwater crab fauna (Decapoda: Potamonautidae: Potamonautes)". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53078.
Pełny tekst źródłaENGLISH ABSTRACT: In the present study, the systematic status, aspects of the evolutionary biology and phylogenetic relationships among species of the African freshwater crab genus Potamonautes in South Africa are examined. Systematic research between allopatric populations of P. brincki, using allozyme and morphometric data has revealed the existence of a new undescribed freshwater crab species occurring in mountain streams of the Cape Peninsula. This species is described in the present study. In addition, the diagnostic value of carapace dentition patterns in the taxonomy of freshwater crabs is explored among two toothed river crab species from South Africa. The latter study utilized P. warreni and P. unispinus where considerable variation in the dentition pattern of the former species has been recorded. Fixed differences in allozyme loci demonstrated that these two taxa should indeed be considered separate, yet closely related species, while the morphometric data failed to reveal this taxonomic separation. The holotype of P. warreni is re-described. The relationship of hybrid taxa between P. depressus and P. clarus populations are investigated. Evident from this study is that populations that occur equidistant from the two parental taxa have undergone extensive introgressive hybridization. Considering the pronounced sequence divergence and the occurrence of fixed allozyme loci between populations, it is postulated that the hybrid populations should be considered to be on a unique evolutionary trajectory worthy of conservation. The population genetic structure of P. calcaratus is examined as this species is unique in its occupation of water holes. Results demonstrate that the genetic population structure is the result of recent colonization and moderate gene flow among populations. Phylogenetic relationships between the southern African freshwater crab fauna is investigated with the use of sequence data from two mitochondial genes (12 S rRNA and 16 S rRNA), allozymes and morphology in an attempt to firstly, test the usefulness of freshwater crabs as biogeographic indicators, secondly to explore the relationship among hybrid taxa, and thirdly to examine Bott's (1955) subgeneric divisions. Results demonstrated that freshwater crabs can be used as biogeographic indicators, that hybrid taxa are phylogenetic ally closely related and that Bott's subgeneric divisions have no systematic basis. Among the three data sets, the sequence data provided the best resolution, while the phylogenetic inferences derived from the allozyme data and the morphology was limited.
AFRIKAANSE OPSOMMING: In hierdie studie word die sistematiek, aspekte van die evolusionêre biologie en filogenetiese verwantskappe tussen spesies van die varswater krap genus Potamonautes ondersoek in Suid Afrika. Navorsing op geografies geisoleerde populasies van P. brincki word met behulp van allosieme en morfometriese data ondersoek en dui daarop dat daar 'n nuwe onbeskryfde spesie op die berge van die Kaapse Skiereiland voorkom. Die nuwe spesies word beskryf in hierdie studie. Die diagnostiese waarde van tand patrone in varswater krappe word tussen twee spesies P. warreni en P. unispinus ondersoek. Genetiese data dui daarop dat alhoewel P. warreni morfologies baie naverwant is aan P. unispin us, is genoegsame verskille in allosiem lokusse wat daarop dui dat die twee taksa volwaardige spesies is. Die holotipe van P. warreni word herbeskryf. Die verwantkap tussen populasies van twee hibried taksa, P. depressus en P. clarus, word ondersoek. Resultate van hierdie studie dui daarop dat noemenswaardige verskille voorkom tussen die twee hibridie taxa en dat die hibriede populasies geneties verskillend is. 'n Argument word aangevoer vir die beskerming van hibriede taksa. Die populasie genetika van P. calcaratus word ondersoek en vergelyk met vorige studies. Die data dui daarop dat minimale geen vloei tusses populasies is en dat die populasie struktuur waarskynlik die resultaat is van onlangse kolonisasie. Die filogenetiese verwantskap tussen die suider Afrikaanse krappe word ondersoek met DNA, allosieme en morfologiese karakters met drie hoofdoele. Eerstens om die gebruik van varswater krappe as biografiese indikatore te toets. Tweedens om die verwantskap van hibriede taksa te ondersoek, en derdens om die status van Bott (1955) se subgenera te bepaal. Resultate dui daarop aan dat varswater krappe wel gebruik kan word as biografiese indikatore. Hibridieserende taxa naverwant is derdens en dat Bott se subgenera geen taksonomiese basis het nie. Die DNA data het die beste resolusie gebied vir die filogenetiese vrae, terwyl die allosieme en morfologiese data 'n laer resolusie bedied het, en meer beperk was.
Mazzone, Angelica <1992>. "New advances in molecular epidemiology of emerging enteric parasites in farmed gilthead sea bream (Sparus aurata) and insights into zoonotic parasites of new relevance in Italian freshwater fish". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9665/1/angelica_mazzone_tesi.pdf.
Pełny tekst źródłaMagoba, Rembuluwani Norman Nicholas. "Effect of invasion and clearing of alien riparian vegetation on benthic macroinvertebrate and adult odonata assemblages in Soutpansberg rivers". Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1800.
Pełny tekst źródłaBenthic macroinvertebrates (sampled using South African Scoring System, SASS5) and adult male Odonata (sampled with close-focus binoculars) were recorded on two streams and a river of Soutpansberg, with the aim of determining the effect of invasion and removal of alien riparian vegetation on their assemblages. A secondary aim was to establish the importance of dragonflies as indicators of degree of disturbance in rivers. Forty two aquatic macroinvertebrate families and 33 adult Odonata species were recorded at a total of 71 sampling units. Three distinct riparian vegetation types were selected (natural, alien and cleared). Cleared vegetation refers to clearing of invasive alien trees, allowing regrowth of natural vegetation. Natural and cleared vegetation supported more benthic macroinvertebrate families compared to alien vegetation. Certain families that were lost to alien vegetation were recorded from natural vegetation. The highest SASS5 score was recorded from natural vegetation, followed by cleared vegetation, and the lowest was from alien vegetation. The highest number of adult Odonata was recorded at cleared vegetation, with alien and natural vegetation supporting the least number of Odonata species. Vegetation type, stream flow and microhabitats were statistically identified as the most influential variables for benthic macroinvertebrate assemblages. For adult Odonata assemblages, vegetation type, shade and temperature were the most important environmental variables. Species assemblages of adult Odonata can be used as indicators of environmental condition of rivers. The clearing of alien riparian vegetation clearly benefits the indigenous benthic macroinvertebrates as conditions are restored to their natural state. It also benefits dragonfly species richness, but if natural succession proceeds to a shaded tree canopy, the effect becomes similar to that of habitat shaded by alien vegetation. The impact of alien vegetation is to reduce sun-loving invertebrate species, especially dragonflies, with lesser impact on shade-loving species.
Oliveira, Ana Maria Barretto de Menezes Sampaio de. "Substituição de fontes protéicas de origem animal por fontes protéicas de origem vegetal em rações para o "Black Bass" Micropterus salmoides". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-25092003-082811/.
Pełny tekst źródłaCommercial farming of carnivorous fish demands the use of a complex group of practices of production and feeding management, the reduction of the environmental impact of the feeds and the minimization of the use of animal protein sources in the diets. The present study investigated the use of feed stimulants in diets formulated exclusively out of plant protein, and their effects in growth performance, body composition and digestibility of the feeds for the carnivore largemouth bass, Micropterus salmoides, conditioned to accept dry feed. Nine hundred juvenile largemouth bass (26.54 ± 1.53 g) were stocked in 60, 90-L polyethylene aquaria (15 fish/aquarium), in a totally randomized experimental design (n=3). Fish were fed ad libitum two daily meals (0700 and 1700), for 13 days, with a basal diet (100% plant protein) containing increasing levels of fish soluble protein FSP (0.5, 1.0, 1.5, 2.0, 2.5, and 3.0%); Fisharom TM FA (0.02, 0.04, 0.06, 0.08, 0.10 and 0.12%); fish silage FS (1.0, 2.0, 3.0, 4.0, 5.0 and 6.0%); a positive control (10% of fish meal) and a negative control (basal diet without stimulants). Fish fed the diet containing 0.02%FA presented better growth rate, weight gain and feed conversion rate, but did not differ from the other treatments (P>0,05). Fish fed diets containing FS as stimulant presented the poorest performance. Next, the effect of different levels of dietary plant protein in the performance and body composition of the species was evaluated. Five hundred and sixty juvenile largemouth bass (3.06 ± 0.20 g) were stocked in 60-L cages, inside 1,000-L polyethylene tanks, installed at a laboratory with closed water-recirculating system and controled temperature (27 o C ± 1.07 o C) and photoperiod (14L:10D). Fish were fed ad libitum two daily meals (0700 and 1700), for 43 days, with 7 isonitrogenous (40% of PB) and isoenergetic (3,500 kcal/kg) diets, containing decreasing levels of plant protein: 100PP:00AP; 100PP + 0.02% Fisharom®; 80PP:20AP; 60PP:40AP; 40PP:60AP; 50PP:50AP (without fish meal); and a control diet (commercial feed). Inclusion of fish meal and feathers meal was limited to 7%; the inclusion of poultry by-product meal and meat and bone meal to 15%. DL methionine (98%) and L-lysine (80%) were added automatically through feed formulation software matrix. Trial was set up in a totally randomized experimental design (n=4). Finally, digestibility of the diets used in the experiment 2 was studied. One thousand, nine hundred and eighty juvenile largemouth bass (14.0 ± 1.0 cm) conditioned to accept artificial, dry feed were confined in polypropilene cages and fed, for 40 days, in day time, with the seven experimental diets added of 0.5% of cromic oxide. In the night, cages were transferred to cylindrical-conical bottomed, 200-L aquaria, where feces were collected by sedimentation into refrigerated containers. Data were submitted to the ANOVA and Tukeys test of comparison of means through statistical software package SAS (P=0.05). Soybean meal can be used as partial substitute of animal protein in diets for largemouth bass; the poultry by-product meal shows as a good option as animal protein source in these rations. Best performances were related to the control treatments and 50PP:50AP; the need for the use of fishmeal in the formulation of diets for carnivorous species is, at least, questionable. Results of the digestibility trials demonstrated the importance of determining the digestibility of the rations, if precision in the formulation of least-cost feeds for carnivorous fish is the ultimate goal.
Almeida, Leah Zoe. "Legacies of early-life experiences on individual, cohort, and population performance of Lake Erie Walleye". The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1614019841185563.
Pełny tekst źródłaDairiki, Jony Koji. "Exigência em lisina pelo "black bass" Micropterus salmoides". Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-19072005-144759/.
Pełny tekst źródłaAdequate nutrition of fish stocks interconnects fish feeding efficiency, profitability and mitigation of environmental impact of fish farming. Knowledge on amino acids requirement of farmed fish boosts rationalization and profitability of fish farming systems. This study compares estimation of amino acids requirements of largemouth bass Micropterus salmoides from data of lysine dose-response trials, analyzed through different statistical models: polynomial regression, broken-line analysis and specific mathematical modeling. Amino acids requirements were estimated through the A/E relationship [A/E = (essential amino acid ÷ total essential amino acids + cystine + tyrosine) x 1.000]. Groups of 25, feed-conditioned largemouth bass fingerlings (1.29 ± 0.03 g; 4.35 ± 0.17 cm), were stocked in 60-L cages (5 mm mesh) placed in 1,000-L plastic, indoor tanks, closed circulation system, and fed diets containing 1.0, 1.5, 2.0, 2.5, 3.0, or 3.5% lysine, in a totally randomized experimental design trial (n = 4). The broken-line analysis method yielded more reliable and precise estimations of lysine requirements 2.1% of diet or 4.9% dietetic protein for final weight, weight gain and specific growth rate. Best feed conversion ratio was attained with 1.69% lysine in the diet or 4.9% lysine in dietetic protein. Body amino acids profile was an adequate reference for estimation of largemouth bass amino acids requirements.
Al-Saffar, Mohammed Abdullah. "Conservation Biology in Poorly Studied Freshwater Ecosystems: From Accelerated Identification of Water Quality Bioindicators to Conservation Planning". Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1456926241.
Pełny tekst źródłaVogel, Carina. "Estratégias de história de vida de peixes neotropicais em diferentes tipos de habitat". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/60554.
Pełny tekst źródłaReproduction represents one of the most important aspects of species biology, because the maintenance of viable populations depends on its success. The success achieved by fishes in different environments is partially related to the diverse reproductive strategies developed by this group. In aquatic environments, the expression of the reproductive strategy of a species depends upon the interactions between intrinsic factors (physiological) and extrinsic factors such as the habitat quality, interspecific relationships, physical factors and hydrological regime. The habitat template theory proposes that the temporal and spatial variability of the physical habitat influences evolution of the combination of behavior, physiology and life history characteristics of species. The habitat is the model against which the evolutionary pressures shape the ecological strategy of a species. In contrast, historical and phylogenetic traits limit some specific characteristics regardless of habitat type. Life-history theory deals with constraints among demographic variables and traits associated with reproduction and the way these constraints, or trade-offs, (i.e., investments in one trait leaving fewer resources available for investment in another), shape strategies for dealing with different kinds of environments. Studies seeking to link biological traits of fishes to environmental characteristics of habitat suggest the existence of a gradient between three primary strategies in freshwater fishes: opportunistic, equilibrium and periodic. However, it has been observed that closely related species exhibit different life-history strategies, while phylogenetically distant species converge independently to similar strategies. Within this context, the goal of this study is to address the relationship in life-history strategies of Neotropical freshwater fishes against different types of habitat. The first chapter deals with the reproductive strategies of Characidae species with different distributions within the basin at a local scale. The second chapter examines at a larger scale the relationships between life history strategies of neotropical fishes of South America and four habitat types and the influence of taxonomy based on morphological and reproductive traits of the species. If the functional characteristics (a set of traits) of organisms are predictable from environmental characteristics would be expected a convergence of these traits in organisms inhabiting the same environment. The second chapter analyses the relationships among life-history strategies of Neotropical fish at different types of habitat and the taxonomic influence using a trait-based approach across large spatial scale. This type of study is important in the search for patterns in distribution and understanding which characteristics allows species to remain in a particular environment or in the colonization of a new one. This knowledge is also important in fisheries management and stocks conservation and endangered species. The trait-based approach allows comparison among geographically distant areas and phylogenetically distant species and support research in evolutionary patterns. The results suggest conservation of some attributes within lower taxonomic groups and it is possible to observe a greater affinity with some families and life-history strategies. It is possible to notice that there is a continuum of species among the strategies showing that some attributes are more versatile than others and may experience greater variation between populations than between species. Taking into account the diversity of neotropical fish species, there are few studies on basic information about the biology of these organisms and the representativeness of the studies focus on a few taxonomic groups. The partial descriptions and imprecisely characterization of reproductive characteristics among studies difficult their use in future studies.
Delgado, Patrick Mathews. "Detecção sorológica de infecção por Toxoplasma gondii e Leptospira spp. em peixes-bois (Trichechus inunguis) de dois centros de preservação da Amazônia brasileira". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/42/42135/tde-04082011-154854/.
Pełny tekst źródłaThis study aimed to evaluate the occurrence of anti-T. gondii and Leptospira spp. in manatees (Trichechus inunguis) from two preservation centers located in the Brazilian Amazon. Blood samples from 74 manatees were taken. For detecting antibodies to T. gondii, sera were diluted 1:25, 1:50 and 1:500 and precense of antibodies was determined by the modified agglutination test (MAT). To Leptospira spp. sera were diluted 1:100 and tested against a collection of 24 antigenic serovars and presence of antibodies was determined by microscopic agglutination test (MAT). Of the 74 manatees 29 (39.2%) were positive to T. gondii with titre at 25. For Leptospira spp. 23 (31.1%) samples were kacted with four serotypes with titers ranging from 100 to 1600. The serovars reagents were Patoc, Castellonis, Icterohaemorrhagiae and Butembo. In one sample, coaglutination of serovars Patoc, Castellonis and Icterohaemorrhagiae (titres 100 and 200) was observed. This is the first report of the occurrence of T. gondii and Leptospira spp. in manatees in the Brazilian Amazon.
Mazancourt, Valentin de. "Diadromie, dispersion et histoire évolutive des complexes "Caridina nilotica" et "Caridina weberi" (Crustacea - Decapoda - Atyidae) dans les systèmes insulaires de l’Indo-Pacifique". Thesis, Paris, Muséum national d'histoire naturelle, 2018. http://www.theses.fr/2018MNHN0021/document.
Pełny tekst źródłaRivers of tropical islands harbor organisms that have developped a diadromous lifecycle, shared between a freshwater adult phase and a marine larval phase: amphidromy. Among these organisms, in the Indo-Pacific area are found shrimps of the genus Caridina H. Milne Edwards, 1837. With more than 300 described species it is the most speciose genus of the infra-order Caridea, with a most confused and complicated taxonomy. Within this genus, two species complexes are particularly well-represented in insular systems of the Indo-Pacific, the C. nilotica complex and the C. weberi complex. Thanks to the development of new sequencing techniques, new methods of integrative taxonomy appeared, allowing to resolve part of the taxonomic complexity of these taxa. The aim of the thesis was to apply an integrative taxonomy approach to species belonging to C. nilotica and C. weberi complexes in order to clarify their taxonomy and have a better understanding of their biology and provide tools to managers for establishing a better conservation of these species and their environments. After showing that some morphological characters traditionally used to describe species were influenced by the environment and so, highly variable, the integrative taxonomy was led on 92 species, allowing to obtain 1,682 sequences to which are added 32 complete and 97 partial mitochondrial genomes, highlighting 43 new species, some of them described during the thesis. Phylogenetic relationships among the species of the two complexes were reconstructed from a large molecular dataset, allowing to show that the complexes are monophyletic groups, with habitat differences. Finally, the feasibility of a sclerochronological study of amphidromy in a species of the C. weberi complex (C. multidentata) was tested on the eyestalk cuticle, with a study of the ultrastructure of the cuticle, described for the first time in this species