Academic literature on the topic 'Mesohabitat'
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Journal articles on the topic "Mesohabitat"
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Gorni, Guilherme R., and Roberto da G. Alves. "Oligochaetes (Annelida, Clitellata) in a neotropical stream: a mesohabitat approach." Iheringia. Série Zoologia 102, no. 1 (March 2012): 106–10. http://dx.doi.org/10.1590/s0073-47212012000100015.
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This paper analyses the relationship among mesohabitat and aquatic oligochaete species in the Galharada Stream (Campos do Jordão State Park, state of São Paulo, Brazil). Between August 2005 and May 2006 a total of 192 samples were obtained in areas of four different mesohabitats: riffle leaf litter (RL), pool leaf litter (PL), pool sediment (PS) and interstitial sediment from rocky beds in riffle areas (IS). In the mesohabitats sampled, 2007 specimens were identified, belonging to two families (Naididae and Enchytraeidae). Among the oligochaetes identified Naididae was represented by six genera (Allonais, Chaetogaster, Nais, Pristina, Aulodrilus and Limnodrilus). Principal components analysis (PCA) revealed the first two axes explained 85.1% of the total variance of the data. Limnodrilus hoffmeisteri Claparede, 1862 and Aulodrilus limnobius Bretscher, 1899 were associated with the pool areas (PL and PS). Most species of genera Pristina and Nais demonstrated apparent affinity with the riffle mesohabitats. The Indicator Species Analysis (IndVal) revealed that Nais communis Piguet, 1906, Pristina leidyi Smith, 1896 and Pristina (Pristinella) jenkinae (Stephenson, 1931) are indicative of RL mesohabitat, while family Enchytraeidae was considered indicative of PL mesohabitat.
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Casatti, Lilian, and Fabrício Barreto Teresa. "A multimetric index based on fish fauna for the evaluation of the biotic integrity of streams at a mesohabitat scale." Acta Limnologica Brasiliensia 24, no. 4 (February 20, 2013): 339–50. http://dx.doi.org/10.1590/s2179-975x2013005000003.
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AIM: In this study, we evaluated the ability of the Index of Biotic Integrity (IBI), based on fish fauna, to discriminate between reference streams and degraded streams at a mesohabitat scale. METHODS: We sampled the ichthyofauna of 96 mesohabitats (runs, riffles and pools) with electrofishing gear in six streams (three reference and three degraded) of comparable volume, width, and depth. Twelve attributes were tested separately for different mesohabitat types. RESULTS: Ten of the metrics tested were used to obtain the IBI for runs, six for riffles and ten for pools. The IBI indicated poor conditions for runs and riffles and very poor conditions for pools. CONCLUSIONS: These results indicate that the IBI may be useful for distinguishing among environments with contrasting conservation status at a mesohabitat scale. Differences were obtained not only in the sets of metrics valid for each mesohabitat but also in the final scores and rankings of the mesohabitat types assessed. These results emphasize the importance of considering the structural and biological variability of aquatic environments to capture the significance of losses of integrity due to human influence.
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Doretto, Alberto, Paolo Espa, Francesca Salmaso, Giuseppe Crosa, and Silvia Quadroni. "Considering mesohabitat scale in ecological impact assessment of sediment flushing." Knowledge & Management of Aquatic Ecosystems, no. 423 (2022): 2. http://dx.doi.org/10.1051/kmae/2021037.
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Benthic macroinvertebrates respond to several factors characterizing the physical habitats, as water depth, current and streambed substrate. Thus, anthropogenic disturbances altering these factors may have different effects on benthos, also depending on mesohabitats. These disturbances include sediment flushing operations, commonly carried out to recover reservoir capacity, and investigating their effects at mesohabitat scale could be relevant for an adequate ecological impact assessment of these operations. Here, we compared benthic macroinvertebrate communities sampled before and after a controlled sediment flushing operation in three different mesohabitats (a pool, a riffle and a step-pool) of an Alpine stream. Contrary from expectations, the composition of macroinvertebrate assemblages was not significantly different among mesohabitats. Moreover, the impact of sediment flushing was more significant in terms of density rather than in richness. Two stressor-specific indices were tested, but only one (the Siltation Index for LoTic EcoSystems − SILTES) clearly detected the impact of sediment flushing on the macroinvertebrate community structure. Finally, some differences in the temporal trajectories and recovery times to pre-flushing conditions were observed among mesohabitats, both if the three mesohabitats were considered separately and if all their possible combinations were accounted for. Particularly, riffle was the most sensitive mesohabitat, not fully recovering one year after the sediment disturbance.
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Sedighkia, Mahdi, Bithin Datta, and Asghar Abdoli. "Reducing the conflict of interest in the optimal operation of reservoirs by linking mesohabitat hydraulic modeling and metaheuristic optimization." Water Supply 22, no. 2 (October 28, 2021): 2269–86. http://dx.doi.org/10.2166/ws.2021.373.
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Abstract The present study proposes a novel framework to optimize the reservoir operation through linking mesohabitat hydraulic modeling and metaheuristic optimization to mitigate environmental impact downstream of the reservoir. Environmental impact function was developed by mesohabitat hydraulic simulation. Then, the developed function was utilized in the structure of the reservoir operation optimization. Different metaheuristic algorithms including practice swarm optimization, invasive weed optimization, differential evolution and biogeography-based algorithm were used to optimize reservoir operation. Root mean square error (RMSE) and reliability index were utilized to measure the performance of algorithms. Based on the results in the case study, the proposed method is robust for mitigating downstream environmental impacts and sustaining water supply by the reservoir. RMSE for mesohabitats is 8%, which indicates the robustness of proposed method to mitigate environmental impacts at downstream. It seems that providing environmental requirements might reduce the reliability of water supply considerably. Differential evolution algorithm is the best method to optimize reservoir operation in the case study.
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Sertić Perić, Mirela, Renata Matoničkin Kepčija, Ines Radanović, Biserka Primc, and Ivan Habdija. "Freshwater reefs as mesohabitats for the assessment of diel invertebrate drift patterns." Natura Croatica 29, no. 2 (March 31, 2021): 185–203. http://dx.doi.org/10.20302/nc.2020.29.26.
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Freshwater reefs (known as tufa barriers) are special karst features recognized for highly heterogeneous habitat structures, complex hydrogeological features, and unique macrozoobenthos drift (downstream dispersal) patterns. Our study objective was to investigate diel and seasonal drift patterns between barriers and pools, both composed of moss-rich and fishless mesohabitat types, aligned on a small spatial scale within the karst, tufa-precipitating Plitvice Lakes hydrosystem. We monthly sampled drift at the two mesohabitat types (barriers and pools) during midday and dusk and examined quantitative and qualitative drift compositions, including drifting invertebrates, moss, and associated particulate organic and inorganic matter (APOIM). Barriers displayed higher invertebrate drift densities than those of pools. The same pattern was observed for moss and APOIM. At both mesohabitat types, invertebrate drift showed peak but highly variable densities during late spring and summer (mean >100 individuals m-3), whereas during late winter and early spring the drift densities were 5-fold lower than those densities. The nonmetric multidimensional scaling analysis revealed that invertebrate drift seasonality was influenced by seasonal drift patterns of aquatic moss and moss-dwelling invertebrate taxa. Adult and/or larval Riolus spp. and larval Hemerodromia spp. were found to be the most significant for the separation of midday and dusk within the NMDS ordination of barriers and pools. At barriers, midday drift densities of invertebrates, moss, and APOIM were higher than the respective dusk records. Within pools, invertebrate drift was largely aperiodic. We suggest that increased midday and/or aperiodic drift are a consequence of the lack of fish between barrier- and pool-mesohabitats. Our results further indicated that aquatic invertebrates inhabiting fast-flowing barriers and slow-flowing pools mostly exhibit “passive drift” mediated by transport agents such as water flow and dislodged aquatic vegetation. The observed spatio-temporal drift patterns are also likely influenced by ontogenetic shifts in drift periodicity (i.e., shifts depending on the development stage and morphological characteristics of the individual taxa) as well as benthic distribution of moss-dwelling invertebrate taxa. We can conclude that biotic (vs. abiotic) controls of drift are likely minimized in the fishless case of the freshwater reefs and associated barrier–pool sequences within Plitvice Lakes hydrosystem.
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Souza, João Luiz de Caíres, Vitor Manuel Barros Ferreira, and Maíra Moraes. "Levantamento de insetos aquáticos em um trecho do rio Tijuca, Floresta da Tijuca – Rio de Janeiro, Brasil." Research, Society and Development 9, no. 1 (January 1, 2020): e148911847. http://dx.doi.org/10.33448/rsd-v9i1.1847.
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A comunidade de insetos aquáticos é extremamente abundante e diversa em riachos neotropicais, apresentando grande importância para estudos de riachos nos dias atuais. Sendo assim o presente estudo tem como objetivo analisar e identificar a comunidade de insetos aquáticos de um trecho do rio Tijuca – Floresta da Tijuca (Rio de Janeiro, RJ). A coleta foi realizada em 2017, utilizando um surber (30x30 cm, malha de 250 μm), com o qual foram coletadas 12 amostras, em 3 habitats (folhiço, pedra e areia) e 2 mesohabitats distintos (poça ou remanso e corredeira). Foram encontrados 1.836 insetos aquáticos, sendo o substrato folhiço o com a maior abundância (1.084), seguido pela areia (434) e pedra (318). Portanto, o estudo concluiu que há grande abundância e variedade de insetos aquáticos presente no trecho do rio Tijuca, onde o tipo de substrato e o mesohabitat são determinantes para entender a distribuição dos indivíduos ao longo do corpo hídrico.
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Gosselin, M. P., G. E. Petts, and I. P. Maddock. "Mesohabitat use by bullhead (Cottus gobio)." Hydrobiologia 652, no. 1 (July 11, 2010): 299–310. http://dx.doi.org/10.1007/s10750-010-0363-z.
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Kennard, Mark J., Bradley J. Pusey, Bronwyn D. Harch, Elli Dore, and Angela H. Arthington. "Estimating local stream fish assemblage attributes: sampling effort and efficiency at two spatial scales." Marine and Freshwater Research 57, no. 6 (2006): 635. http://dx.doi.org/10.1071/mf06062.
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As part of a wider study to develop an ecosystem-health monitoring program for wadeable streams of south-eastern Queensland, Australia, comparisons were made regarding the accuracy, precision and relative efficiency of single-pass backpack electrofishing and multiple-pass electrofishing plus supplementary seine netting to quantify fish assemblage attributes at two spatial scales (within discrete mesohabitat units and within stream reaches consisting of multiple mesohabitat units). The results demonstrate that multiple-pass electrofishing plus seine netting provide more accurate and precise estimates of fish species richness, assemblage composition and species relative abundances in comparison to single-pass electrofishing alone, and that intensive sampling of three mesohabitat units (equivalent to a riffle–run–pool sequence) is a more efficient sampling strategy to estimate reach-scale assemblage attributes than less intensive sampling over larger spatial scales. This intensive sampling protocol was sufficiently sensitive that relatively small differences in assemblage attributes (<20%) could be detected with a high statistical power (1-β > 0.95) and that relatively few stream reaches (<4) need be sampled to accurately estimate assemblage attributes close to the true population means. The merits and potential drawbacks of the intensive sampling strategy are discussed, and it is deemed to be suitable for a range of monitoring and bioassessment objectives.
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Severo-Neto, Francisco, Fabrício B. Teresa, and Otávio Froehlich. "Ecomorphology and diet reflect the spatial segregation between two Siluriformes species inhabiting a stream of the Bodoquena Plateau, in Central Brazil." Iheringia. Série Zoologia 105, no. 1 (March 2015): 62–68. http://dx.doi.org/10.1590/1678-4766201510516268.
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Pimelodella taenioptera Miranda Ribeiro, 1914 and Imparfinis schubarti (Gomes, 1956) are two of the most common fish species in Bodoquena Plateau streams, Paraguay basin. These species have benthic habits and subaquatical observations suggested that they present differentiation in their preference for mesohabitat types. Pimelodella taenioptera shows preference for slow waters, such as pools, while I. schubarti is associated to riffles. In this study we investigated if the known patterns of mesohabitat use of P. taenioptera and I. schubarti can be predict by their ecomorphological and trophic traits. We described the dietary habits and ecomorphological attributes of P. taenioptera and I. schubarti individuals, captured in the Parque Nacional da Serra da Bodoquena (PNSB), Mato Grosso do Sul state, central Brazil. Pimelodella taenioptera presented a more generalist diet, consuming a total of 23 different food items. Imparfinis schubarti have a diet based exclusively on aquatic insects. The ecomorphological analysis revealed that the species differed in relation to five morphological traits associated to habitat use (p <0.01). The results of this study reveal a clear functional dissimilarity between P. taenioptera and I. shubarti. The observed trophic and ecomorphological patterns are congruent with the known habitat use for these species and probably reflect the spatial and temporal variability on conditions and resources present in riffles and pools. Therefore, as expected, the morphological and feeding attributes represent predictive information related to mesohabitat use.
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Wegscheider, Bernhard, Tommi Linnansaari, and R. Allen Curry. "Mesohabitat modelling in fish ecology: A global synthesis." Fish and Fisheries 21, no. 5 (June 15, 2020): 927–39. http://dx.doi.org/10.1111/faf.12477.
Full textDissertations / Theses on the topic "Mesohabitat"
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Melo, Ana Liz Uchida. "Estrutura das comunidades de macroinvertebrados bentônicos de riachos de cabeceira sob a influência de diferentes estados de conservação da mata ripária." Botucatu, 2018. http://hdl.handle.net/11449/153559.
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Orientador: Virginia Sanches UiedaResumo: Os ecossistemas aquáticos servem de habitat e local de alimentação para uma fauna bastante diversificada. Apesar da grande importância desses ambientes, o crescente aumento das populações humanas e o uso da terra para diferentes fins têm levado a uma intensa alteração desses locais e trazido diversos impactos para a fauna de invertebrados bentônicos. O objetivo deste trabalho foi analisar a possível influência de diferentes estados de conservação da mata ripária sobre a estrutura do habitat e da fauna de macroinvertebrados bentônicos. O trabalho foi realizado em 36 riachos localizados em quatro microbacias, na área suburbana e rural do município de Avaré, SP, sendo em cada microbacia estudados 3 riachos apresentando mata ripária nas duas margens (denominado perfil Mata), 3 com a mata totalmente excluída (perfil Pasto) e 3 com mata somente em uma das margens (perfil Intermediário). Entre outubro e dezembro de 2015 foi realizada a caracterização dos riachos utilizando um protocolo de análise física do habitat, que possibilita uma análise quantitativa ampla e, assim, uma caracterização detalhada do riacho, e a coleta dos invertebrados com amostrador surber (malha 250 µm). A análise dos dados ambientais mostrou uma separação nítida entre os riachos de mata e pasto, em função do substrato e mesohabitat, com os riachos de mata sendo caracterizados pelo substrato grosseiro e abrigo de folhas e os riachos de pasto pelo substrato fino e abrigo de macrófitas. Para a análise da composiç... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Aquatic ecosystems serve as habitat and feeding place for a diversified fauna. Despite the great importance of these environments, the increase in human population and the use of land for different purposes had led to an intense alteration of these places and brought diverse impacts to the fauna of benthic invertebrates. This study aims to analyze the possible influence of different states of riparian vegetation conservation on the habitat and the structure of benthic invertebrates. The work was carried out in 36 streams located in four microbasins, in the suburban and rural area of the municipality of Avaré, SP. In each microbasin was studied 3 streams presenting riparian vegetation on both banks (Forest profile), 3 with forest completely excluded (Pasture profile) and 3 with this vegetation only in one margin (Intermediate profile). Between October and December 2015, the characterization of the streams was carried out using a protocol of physical analysis of the habitat, which allows a comprehensive quantitative analysis and, thus, a detailed stream characterization, and the invertebrates were sampled with a surber sampler (250 µm net). The analysis of the environmental data showed a clear separation between forest and pasture streams, as a function of the substrate and mesohabitat, with forest streams represented by coarse substrate and leaves shelter and pasture streams represented by fine substrate and macrophyte shelter. In the analysis of the fauna composition (presenc... (Complete abstract click electronic access below)
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Della, Bella Valentina. "COMPOSIZIONE TASSONOMICA, ORGANIZZAZIONE FUNZIONALE E STRUTTURA IN TAGLIA DELLA MACROFAUNA A INVERTEBRATI DI BIOTOPI TEMPORANEI E PERMANENTI DEL LITORALE TIRRENICO - TAXONOMIC COMPOSITION, FUNCTIONAL ORGANIZATION AND SIZE STRUCTURE OF MACROINVERTEBRATE COMMUNITIES IN TEMPORARY AND PERMANENT PONDS OF THE TYRRHENIAN COAST." Doctoral thesis, La Sapienza, 2005. http://hdl.handle.net/11573/916841.
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Hansen, Jonathan Ford. "Long-term implications of dam removal for mesohabitat and macroinvertebrate communities in Michigan and Wisconsin rivers." Diss., Connect to online resource - MSU authorized users, 2008.
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Ferro, Michael Leslie. "The ephemeroptera, plecoptera, and trichoptera of Missouri state parks with notes on biomonitoring, mesohabitat associations, and distribution." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4273.
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Thesis (M.S.) University of Missouri-Columbia, 2005.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 10, 2006) Includes bibliographical references.
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Bertolucci, Maria Paula Barchi [UNESP]. "O tipo de mesohabitat (corredeira e remanso) e a complexidade do substrato afetam a fauna de macroinvertebrados aquáticos de riacho." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/99453.
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Os diferentes tipos de mesohabitat e a complexidade do substrato podem ser um importante fator na determinação da riqueza, abundância e distribuição das comunidades bentônicas. Neste sentido, no presente trabalhos fizemos um experimento em um riacho do Parque Estadual Intervales, Estado de São Paulo, com o objetivo de responder as seguintes questões: 1) a abundância, riqueza e composição da fauna de macroinvertebrados aquáticos são afetadas pelo tipo de mesohabitat (corredeira e remanso)? 2) a abundância, riqueza e composição da fauna são afetadas por substratos com diferentes complexidades fractais? 3) A fauna é afetada pela interação entre o tipo de mesohabitat e a complexidade do substrato? Para responder esses questionamentos, coletamos dados experimentais em um riacho de Mata Atlântica do Sudeste do Brasil. Foram coletados 2.223 indivíduos. O primeiro eixo da DCA explicou 48,5% da variabilidade e separou a fauna coletada em remanso daquela coletada em corredeira. O segundo eixo explicou 15,9% e não pôde ser interpretado. A DCA não mostrou nenhum padrão que pudesse ser explicado pelas diferentes dimensões fractais. A maior abundância dos macroinvertebrados aquáticos foi observada em corredeiras. O tipo de mesohabitat e a complexidade do substrato não afetaram a riqueza padronizada. Por outro lado, o tipo de mesohabitat afetou significativamente a composição faunística, DCA I
The richness, abundance and distribution of benthic communities may be affected by the different types of mesohabitat and by substrate complexity. In this sense, in the present work, we made a experiment in a stream located in the Intervales State Park, São Paulo State, with the aim to answer the following questions: 1) are abundance, richness and the faunal composition of aquatic macroinvertebrates affected by the type of mesohabitat (riffle and pool)? 2) Are abundance, richness and the faunal composition affected by the substrates with different fractal complexity? 3) Does the interaction between mesohabitat type and substrate complexity affect the fauna? To answer these questions, we collected experimental data in an Atlantic Rainforest stream in the Southeastern of Brazil. We collected 2.223 individuals. The first axis of DCA explained 48.5% of the variability and segregated the fauna of riffle from that of pool. The second axis explained 15,9% and could not be interpreted. The DCA analyses did not show any pattern that could be explained by the different fractal dimensions. The greatest aquatic macroinvertebrate abundance was observed in riffles. The mesohabitat type and the substrates complexity did not affect the standardized richness. On the other hand, the mesohabitat type affected significantly the faunal composition, DCA I
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Bertolucci, Maria Paula Barchi. "O tipo de mesohabitat (corredeira e remanso) e a complexidade do substrato afetam a fauna de macroinvertebrados aquáticos de riacho /." Botucatu : [s.n.], 2012. http://hdl.handle.net/11449/99453.
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Orientador: Ricardo Cardoso BenineBanca: Virginia Sanches Uieda
Banca: Alaide Aparecida Fonseca Gessner
Resumo: Os diferentes tipos de mesohabitat e a complexidade do substrato podem ser um importante fator na determinação da riqueza, abundância e distribuição das comunidades bentônicas. Neste sentido, no presente trabalhos fizemos um experimento em um riacho do Parque Estadual Intervales, Estado de São Paulo, com o objetivo de responder as seguintes questões: 1) a abundância, riqueza e composição da fauna de macroinvertebrados aquáticos são afetadas pelo tipo de mesohabitat (corredeira e remanso)? 2) a abundância, riqueza e composição da fauna são afetadas por substratos com diferentes complexidades fractais? 3) A fauna é afetada pela interação entre o tipo de mesohabitat e a complexidade do substrato? Para responder esses questionamentos, coletamos dados experimentais em um riacho de Mata Atlântica do Sudeste do Brasil. Foram coletados 2.223 indivíduos. O primeiro eixo da DCA explicou 48,5% da variabilidade e separou a fauna coletada em remanso daquela coletada em corredeira. O segundo eixo explicou 15,9% e não pôde ser interpretado. A DCA não mostrou nenhum padrão que pudesse ser explicado pelas diferentes dimensões fractais. A maior abundância dos macroinvertebrados aquáticos foi observada em corredeiras. O tipo de mesohabitat e a complexidade do substrato não afetaram a riqueza padronizada. Por outro lado, o tipo de mesohabitat afetou significativamente a composição faunística, DCA I
Abstract: The richness, abundance and distribution of benthic communities may be affected by the different types of mesohabitat and by substrate complexity. In this sense, in the present work, we made a experiment in a stream located in the Intervales State Park, São Paulo State, with the aim to answer the following questions: 1) are abundance, richness and the faunal composition of aquatic macroinvertebrates affected by the type of mesohabitat (riffle and pool)? 2) Are abundance, richness and the faunal composition affected by the substrates with different fractal complexity? 3) Does the interaction between mesohabitat type and substrate complexity affect the fauna? To answer these questions, we collected experimental data in an Atlantic Rainforest stream in the Southeastern of Brazil. We collected 2.223 individuals. The first axis of DCA explained 48.5% of the variability and segregated the fauna of riffle from that of pool. The second axis explained 15,9% and could not be interpreted. The DCA analyses did not show any pattern that could be explained by the different fractal dimensions. The greatest aquatic macroinvertebrate abundance was observed in riffles. The mesohabitat type and the substrates complexity did not affect the standardized richness. On the other hand, the mesohabitat type affected significantly the faunal composition, DCA I
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Paciencia, Gabriel de Paula. "Avaliando os efeitos do tamanho do riacho, do tipo de mesohabitat e da estação do ano sobre a fauna de Ephemeroptera, Plecoptera e Trichoptera." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/59/59131/tde-05052013-121602/.
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Na presente tese investigamos o papel de alguns dos fatores mais importantes na estruturação da fauna de EPT em riachos. No primeiro capítulo, abordamos os efeitos do tamanho do riacho, do tipo de mesohabitat (corredeira e remanso) e da estação do ano (seca e chuva) sobre a abundância, riqueza e composição de Ephemeroptera, Plecoptera e Trichoptera (EPT). Segundo os nossos resultados, a abundância respondeu de forma significativa às interações entre o tipo de mesohabitat e o tamanho do riacho; e entre estação do ano e o tamanho do riacho. A riqueza foi influenciada significativamente pelo tamanho do riacho. Adicionalmente, tanto o tipo de mesohabitat quanto o tamanho do riacho afetaram significativamente a composição faunística (DCA I). O tipo de mesohabitat pode ser considerado um bom preditor da fauna de EPT, mesmo em um sistema altamente sazonal como é o caso dos riachos aqui estudados. No segundo capítulo, apresentamos equações representativas da relação tamanho corpóreo (comprimento do corpo e largura da cápsula cefálica) para táxons de EPT. Considerando os dados obtidos, recomendamos, sempre que possível, a utilização do comprimento do corpo e apenas as equações com o R2 acima de 0,65, as quais podem ser úteis em trabalhos onde informações gerais sobre a biomassa de EPT são necessárias. Este capítulo serviu de base para o capítulo III. No terceiro capítulo, abordamos os padrões de distribuição de frequência do tamanho corpóreo e a relação entre tamanho corpóreo e abundância de EPT. Os nossos resultados mostraram que independente do riacho, do tipo de mesohabitat e da estação do ano, no geral, as distribuições se encaixaram em uma distribuição normal. Considerando as relações entre o tamanho corpóreo e abundância, os dados de 50% das assembleias de EPT analisadas individualmente se encaixaram numa forma piramidal. Em nenhum dos casos, observamos relações lineares negativas, portanto, os nossos dados discordam da Regra de Equivalência Energética. Nossos resultados sugerem que um único fator (e.g. balanço energético) é insuficiente para explicar a relação tamanho-abundância de EPT em ambientes altamente variáveis como os riachos aqui estudados.In this thesis we investigate the role of some of the most important factors in structuring EPT fauna in streams. In the first chapter, we discuss the effects of stream size, type of mesohabitat (riffles and pools) and season (rainy and dry) on the abundance, richness and composition of Ephemeroptera, Plecoptera and Trichoptera (EPT). According to our results, the abundance responded significantly to the interactions between mesohabitat type and size of the stream, and between season and size of the stream. Richness was significantly influenced by the size of the stream. Additionally, both the mesohabitat type and size of the stream significantly affected the faunal composition (DCA I). The type of mesohabitat can be considered a good predictor of EPT fauna, even in a highly seasonal system like the streams studied here. In the second chapter, we present equations representing the relative body size (body length and width of head capsule) for EPT taxa. Considering the data obtained, it is recommended, where possible, using the length of the body and only equations with R2 above 0.65, which may be useful when general information on the EPT biomass is necessary. This chapter supported the Chapter III. In third chapter we discuss the patterns of frequency distribution of body size and the relationship between body size and abundance of EPT. Our results show that regardless of the stream, the type of mesohabitat and the season, in general, the data on body size fit the normal distribution. Considering the relations between body size and abundance, the data of 50% of EPT assemblages analyzed individually fit the pyramidal shape. In any case, we observed negative linear relationship, therefore, our data disagree with the Energy Equivalence Rule. Our results suggest that a single factor (e.g. energy balance) is insufficient to explain the relationship between size and abundance of EPT in highly variable environments such as streams studied here.
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Mazão, Gustavo Rincon. "A complexidade do substrato e o mesohabitat (remanso e corredeira) são farores que influenciam a fauna de Chironomidae (Diptera) em riachos do Brasil Central?" Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/59/59131/tde-24082009-084058/.
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O presente trabalho teve o objetivo testar os efeitos da complexidade do substrato e do tipo de mesohabitat (remanso e corredeira) sobre a riqueza, a abundância e a composição de Chironomidae (Diptera) em riachos. O experimento foi realizado em 12 riachos do Brasil Central, onde em cada mesohabitat (remanso e corredeira) foram colocadas duas bandejas de plástico, uma contendo substrato com alta complexidade e outra contendo substrato com baixa complexidade. Estes substratos permaneceram no riacho durante 20 dias. Os efeitos da complexidade do substrato e dos mesohabitats não foram significativos nem sobre a riqueza padronizada nem sobre a abundância, por outro lado, o efeito do mesohabitat foi significativo sobre a composição faunística. O primeiro eixo da DCA (33% da variabilidade) separou claramente a fauna de remansos da de corredeiras. A análise de espécies indicadoras mostrou que Chironomus sp., Ablabesmyia sp.1, Ablabesmyia sp.2, Djalmabatista sp., Fittkauimyia sp., Labrundinia sp. indicaram o remanso, e Paratendipes sp., Polypedilum sp.2, Pentaneura sp., Rheotanytarsus sp.1, Corynoneura sp.2, Cricotopus sp.2, Lopescladius sp., Nanocladius sp.2, Parametriocnemus sp. e Thienemanniella sp. indicaram a corredeira.The present study had the aim to test the effects of the substrate complexity and of the mesohabitat (pools and riffles) on the richness, abundance and composition of Chironomidae (Diptera) in streams. The experiment took place in 12 streams of Central Brazil. In each stream, two plastic trays were put in each one of the two studied mesohabitats (pool and riffle), one with higher complexity substrate and one with lower complexity substrate. These substrates were kept in the streams for 20 days. The effects of substrate complexity and of mesohabitat were not significative neither on the standarized richness nor on the abundance. On the other hand, the effect of mesohabitat was significative on the faunistic composition. The first axis of DCA (33% of variability) separated cleanly the fauna in pools from those in riffles. The indicator species analysis showed that Chironomus sp., Ablabesmyia sp.1, Ablabesmyia sp.2, Djalmabatista sp., Fittkauimyia sp., Labrundinia sp. indicated pools, and Paratendipes sp., Polypedilum sp.2, Pentaneura sp., Rheotanytarsus sp.1, Corynoneura sp.2, Cricotopus sp.2, Lopescladius sp., Nanocladius sp.2, Parametriocnemus sp. and Thienemanniella sp. indicated riffles.
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Boys, Craig Ashley, and n/a. "Fish-Habitat Associations in a Large Dryland River of the Murray-Darling Basin, Australia." University of Canberra. Resource, Environmental & Heritage Sciences, 2007. http://erl.canberra.edu.au./public/adt-AUC20070807.112943.
Full textAbstract:
Many aspects concerning the association of riverine fish with in-channel habitat remain
poorly understood, greatly hindering the ability of researchers and managers to address
declines in fish assemblages. Recent insights gained from landscape ecology suggest
that small, uni-scalar approaches are unlikely to effectively determine those factors that
influence riverine structure and function and mediate fish-habitat associations. There
appears to be merit in using multiple-scale designs built upon a geomorphologically-derived
hierarchy to bridge small, intermediate and large spatial scales in large rivers.
This thesis employs a hierarchical design encompassing functional process zones
(referred to hereafter as zones), reaches and mesohabitats to investigate fish-habitat
associations as well as explore patterns of in-channel habitat structure in one of
Australia's largest dryland river systems; the Barwon-Darling River.
In this thesis, empirical evidence is presented showing that large dryland rivers are
inherently complex in structure and different facets of existing conceptual models of
landscape ecology must be refined when applied to these systems. In-channel habitat
and fish exist within a hierarchical arrangement of spatial scales in the riverscape,
displaying properties of discontinuities, longitudinal patterns and patch mosaics. During
low flows that predominate for the majority of time in the Barwon-Darling River there
is a significant difference in fish assemblage composition among mesohabitats. There is
a strong association between large wood and golden perch, Murray cod and carp, but
only a weak association with bony herring. Golden perch and Murray cod are large
wood specialists, whereas carp are more general in there use of mesohabitats. Bony
herring are strongly associated with smooth and irregular banks but are ubiquitous in
most mesohabitats. Open water (mid-channel and deep pool) mesohabitats are
characterised by relatively low abundances of all species and a particularly weak
association with golden perch, Murray cod and carp. Murray cod are weakly associated
with matted bank, whereas carp and bony herring associate with this mesohabitat patch
in low abundance.
Nocturnal sampling provided useful information on size-related use of habitat that was
not evident from day sampling. Both bony herring and carp exhibited a variety of
habitat use patterns throughout the die1 period and throughout their lifetime, with
temporal partitioning of habitat use by juvenile bony herring and carp evident. Much of
the strong association between bony herring and smooth and irregular banks was due to
the abundance of juveniles (<100mm in length) in these mesohabitats. Adult bony
herring (>100mm length) occupied large wood more than smooth and irregular banks.
At night, juvenile bony herring were not captured, suggesting the use of deeper water
habitats. Adult bony herring were captured at night and occupjed large wood, smooth
bank and irregular bank. Juvenile carp (<200mm length) were more abundant at night
and aggregated in smooth and irregular banks more than any other mesohabitat patch.
Adult carp (>200mm length) occupied large wood during both day and night.
There is a downstream pattern of change in the fish assemblage among river zones, with
reaches in Zone 2 containing a larger proportion of introduced species (carp and
goldfish) because of a significantly lower abundance of native species (bony herring,
golden perch and Murray cod) than all other zones. In comparison, the fish assemblage
of Zone 3 was characterised by a comparatively higher abundance of the native species
bony herring, golden perch and Murray cod. A significant proportion of the amongreach
variability in fish assemblage composition was explained at the zone scale,
suggesting that geomorphological influences may impose some degree of top-down
constraint over fish assemblage distribution. Although mesohabitat composition among
reaches in the Barwon-Darling River also changed throughout the study area, this
pattern explained very little of the large-scale distribution of the fish assemblage, with
most of the variability in assemblage distribution remaining unexplained. Therefore,
although mesohabitat patches strongly influence the distribution of species within
reaches, they explain very little of assemblage composition at intermediate zone and
larger river scales. These findings suggest that small scale mesohabitat rehabilitation
projects within reaches are unlikely to produce measurable benefits for the fish
assemblage over intermediate and large spatial scales in the Barwon-Darling River. This
indicates the importance taking a holistic approach to river rehabilitation that correctly
identifies and targets limiting processes at the correct scales.
The variable nature of flow-pulse dynamics in the Barwon-Darling River creates a
shifting habitat mosaic that serves to maintain an ever-changing arrangement of habitat
patches. The inundation dynamics of large wood habitat described in this thesis
highlights the fragmented nature of mesohabitat patches, with the largest proportion of
total in-channel large wood remaining unavailable to fish for the majority of the time.
At low flows there is a mosaic of large wood habitat and with increasing discharge more
potential large wood habitat becomes available and does so in a complex spatial
manner. What results in this dryland river is a dynamic pattern of spatio-temporal
patchiness in large wood habitat availability that is seen both longitudinally among
different river zones and vertically among different heights in the river channel. Water
resource development impacts on this shifting habitat mosaic.
Projects undertaking both fish habitat assessment and rehabilitation need to carefully
consider spatial scale since the drivers of fish assemblage structure can occur at scales
well beyond that of the reach. Fish-habitat associations occurring at small spatial scales
can become decoupled by process occurring across large spatial scales, making
responses in the fish assemblage hard to predict. As rivers become increasingly
channelised, there is an urgent need to apply research such as that conducted in this
thesis to better understand the role that in-channel habitats play in supporting fish and
other ecosystem processes. Habitat rehabilitation projects need to be refined to consider
the appropriate scales at which fish assemblages associate with habitat. Failure to do so
risks wasting resources and forgoes valuable opportunities for addressing declines in
native fish populations. Adopting multi-scalar approaches to understanding ecological
processes in aquatic ecosystems, as developed in this thesis, should be a priority of
research and management. To do so will enable more effective determination of those
factors that influence riverine structure and function at the approariate scale.
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Ostby, Brett John Kaste. "Characterization of Suitable Habitats for Freshwater Mussels in the Clinch River, Virginia and Tennessee." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/42179.
Full textAbstract:
With a new focus on flow regulation by the Tennessee Valley Authority (TVA) in reservoir tailwaters, it is now possible to recover many mussel species that once occurred in these reaches. Before flows can be modified to create habitat for freshwater mussels, suitable microhabitat conditions must be defined. In this study, I used multiple approaches to define suitable microhabitats for species in the free-flowing upper Clinch River, Virginia and Tennessee, where reproducing mussel populations persist.
During summer low flows in 2003 and 2004, I measured flow and substrate conditions in over 1000 microhabitat patches (0.25 m2 quadrat samples) across five river reaches. Flow characteristics and embeddedness were significantly different between microhabitats occupied and unoccupied by the most abundant species (MRPP, p < 0.05). Comparison of simple and multiple logistic regression models with Akaikeâ s Information Criteria (AIC) demonstrated that increasing Fleisswasserstammtisch (FST) hemisphere number (a measure of shear stress), decreasing degree of embeddedness, and increasing mean column velocity best explained species occurrences in a microhabitat patch. Subtle differentiation in habitat use among species was
observed; however, most species appeared to be microhabitat generalists. Species were grouped into three habitat guilds using corresponding canonical analysis and cluster analysis: fast-flow specialists (FFS), fast-flow generalists (FFG), and slow-flow tolerant (SFT).
I used the same data set to develop and test transferability of Habitat Suitability Criteria (HSC) for three habitat guilds and seven species of adult freshwater mussels. Nonparametric tolerance limits were used to define the range of suitable and optimal habitat during summer low flows. Optimal habitat was defined as those ranges of FST hemisphere number, mean column velocity, and embeddedness occupied by the central 50% of independent observations for a species or guild, whereas suitable habitat was defined by those ranges occupied by the central 90% of observations. The transferability of criteria to other reaches of the Clinch River was assessed using one-sided Chi-square tests. Criteria developed for the fast-flow specialist (FFS) and fast-flow generalist (FFG) guilds, as well as most criteria for species in those guilds, transferred to destination reaches. In contrast, criteria developed for the slow-flow tolerant (SFT) guild and individual constituent species consistently failed to transfer. Criteria for FFS and FFG guilds and their constituent species should be incorporated into flow simulation models such as PHABSIM to gauge the effect of minimum flows on mussel habitat quality and quantity. These criteria could also be used to determine suitable sites for mussel translocations. However, my criteria require further testing in other rivers before they can be transferred beyond the Clinch River.
Behavior and physiological responses to laboratory manipulations of flow velocity and substrate particle size were used to elucidate microhabitat preferences of Actinonaias pectorosa,
Potamilus alatus, and Ptychobranchus subtentum. These species appeared less stressed in the fastest flow treatment, demonstrating significantly higher oxygen consumption and oxygen-to-
nitrogen (O:N) ratios than in slower flow treatments. Only P. alatus demonstrated a preference for substrate particle size, and consistently selected finer particle sizes. Actinonaias pectorosa and P. subtentum demonstrated preference for fast-flow microhabitats by readily burrowing in those conditions, while abandoning slow-flow conditions. The lack of preference for substrate particle size demonstrated by A. pectorosa and P. subtentum supports conclusions of previous studies that substrate particle size is of little or secondary importance for explaining mussel microhabitat use.
These results, along with previous studies in the Clinch River, demonstrate that the stable habitats of riffles and runs; characterized by fast flows during summer low flows, low percent bedrock, and low embeddedness, are the most suitable habitats for mussel assemblages. To create and maintain suitable habitat conditions in tailwaters, releases should maintain flow over riffles at a minimum depth of no less than 30 cm in riffles that provide higher shear stress conditions (FST number > 7) and velocities (> 0.70 m/s). Periodic releases that are sufficient to transport silt and sand, but not high enough to transport larger substrate should be adequate to maintain substrates with a low degree of embeddedness. Doing so would create suitable habitat for all mussels, from the most to least specialized. Additionally, HSC developed for FFS and FFG guilds can be used to determine suitable destination sites for translocations of species belonging to these guilds.Master of Science
Books on the topic "Mesohabitat"
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Braun, Christopher L. Physical characteristics and fish assemblage composition at site and mesohabitat scales over a range of streamflows in the middle Rio Grande, New Mexico, winter 2011-12, summer 2012. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2015.
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Braun, Christopher L. Baseline assessment of physical characteristics, aquatic biota, and selected water-quality properties at the reach and mesohabitat scale for reaches of Big Cypress, Black Cypress, and Little Cypress bayous, Big Cypress Basin, northeastern Texas, 2010-2011. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2013.
Find full textBook chapters on the topic "Mesohabitat"
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"Propagated Fish in Resource Management." In Propagated Fish in Resource Management, edited by MAUREEN G. WALSH and DANA L. WINKELMAN. American Fisheries Society, 2004. http://dx.doi.org/10.47886/9781888569698.ch35.
Full textAbstract:
<em>Abstract.</em>—Rainbow trout <em>Oncorhynchus mykiss </em>have been widely stocked throughout the United States as a popular sport fish. Our study was initiated to evaluate potential effects of rainbow trout introduction on native fishes to inform future decisions about trout stocking in northeastern Oklahoma streams. We sampled fish assemblages in pools, glides, and riffles in Brush Creek, Delaware County, Oklahoma, from February 2000 to September 2002, and experimentally stocked rainbow trout into the stream from November 2000 to March 2001 and November 2001 to March 2002. We used a combination of multivariate analyses to evaluate seasonal and habitat effects on native fish assemblages and to compare assemblage structure between prestocking, the first year of stocking, and the second year of stocking. Mesohabitat type significantly affected assemblage structure among years, whereas we did not detect an effect of season. We did not detect differences in assemblage structure among years in glide or riffle habitats. Native fish assemblage structure in pool habitats before rainbow trout introduction differed from assemblage structure in both the first and second year of stocking. Declines in seven species, including two native game fish (smallmouth bass <em>Micropterus dolomieu </em>and bluegill <em>Lepomis machrochirus</em>), contributed to assemblage dissimilarity in pool habitats between prestocking conditions and the second year of stocking. Our results indicate that stocking rainbow trout may cause local disruption in assemblage structure in pool habitats.
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"Managing Centrarchid Fisheries in Rivers and Streams." In Managing Centrarchid Fisheries in Rivers and Streams, edited by Travis R. Ingram, Steven M. Sammons, Adam J. Kaeser, Rachel A. Katz, and Sean C. Sterrett. American Fisheries Society, 2019. http://dx.doi.org/10.47886/9781934874523.ch11.
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<em>Abstract.</em>—Shoal Bass <em> Micropterus cataractae </em>are fluvial specialists endemic to the Apalachicola-Chattahoochee-Flint River Basin that are considered to be in decline throughout their native range. Effective conservation requires a comprehensive understanding of the migratory behavior and multi-scale habitat associations of Shoal Bass with riverine shoals, the critical mesohabitat upon which the species depends. We assessed movement patterns and habitat use of Shoal Bass using radio telemetry in the lower 24 km of Ichawaynochaway Creek, a 6th-order tributary of the Flint River and one of the few relatively undisturbed streams inhabited by this species. In general, Shoal Bass exhibited relatively low movement rates with increased movement in the spring, and no tagged Shoal Bass migrated from the creek into the Flint River during the study period. Most study fish preferred moderate depths (<2 m) and swift velocities during the year, and higher velocities in the winter, potentially reflecting seasonal changes in flow. These conditions were routinely satisfied through occupation of a 9-km reach with a network of large shoal complexes. Shoal Bass exhibited a distinct preference for close proximity to large shoals, and an affinity for greater depth variability associated with edge and boundary conditions within discrete shoal complexes. Despite previous studies that have documented high movement of this species in other systems, these findings suggest that the Ichawaynochaway Creek Shoal Bass population may be relatively sedentary and associate to specific areas that provide suitable habitat. This may have implications for assessing the integrity, distribution, and abundance of suitable Shoal Bass habitat in small karst limestone streams, designing projects for restoration or enhancement of existing habitat, and gauging the species vulnerability to threats such as habitat loss, introgression, and hybridization.
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"Black Bass Diversity: Multidisciplinary Science for Conservation." In Black Bass Diversity: Multidisciplinary Science for Conservation, edited by Michael D. Tringali, Brandon L. Barthel, Seifu Seyoum, and John R. Knight. American Fisheries Society, 2015. http://dx.doi.org/10.47886/9781934874400.ch33.
Full textAbstract:
<em>Abstract</em>.—While investigating hybridization in Shoal Bass <em>Micropterus cataractae</em> in the Chipola River, Florida, we encountered a distinctive genetic signature from an unknown taxon. We soon determined that the signature originated from a novel bass that inhabits Gulf Coastal Plain rivers and streams in Florida. Superficially, these bass resemble Spotted Bass <em>M. punctulatus</em> and historically have been considered as such. Cladistically, they are diagnosable through four autapomorphies at two nuclear gene introns and one mitochondrial DNA gene; phenetically, by various clustering techniques using 17 microsatellite loci. In nuclear-gene phylogenies based on 10 sequenced introns, this taxon is reciprocally monophyletic and shares a common ancestor with a clade comprising Spotted Bass and Guadalupe Bass <em>M. treculii</em>. Morphologically, its members differ from Spotted Bass, Alabama Bass <em>M. henshalli</em>, and Guadalupe Bass in mean/modal counts of soft anal-fin and dorsal-fin rays. They further appear to differ from Guadalupe Bass in mean/modal counts of scales above and below the lateral line and around the caudal peduncle. Little is known yet about the biology and life history of this new taxon. It appears to occupy different mesohabitats than those occupied by sympatric congeners, although its habitat preferences seem to be most similar to those of the Guadalupe Bass. Operational requirements were satisfied for 11 of 15 applicable species concepts, providing a foundation for taxonomic recognition under the fundamental evolutionary species concept. For operational concepts in which requirements were not satisfied, analogous shortfalls occur in all recognized micropterids. We therefore recommend that this taxon, designated herein as the Choctaw Bass, be elevated to species rank. Undetected, native populations of Choctaw Bass could be susceptible to negative ecological and genetic impacts and/or serve as vectors of similar damage to congeneric populations.
Conference papers on the topic "Mesohabitat"
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Negro, Giovanni, Mauro Carolli, Andrea Andreoli, David Farò, Guido Zolezzi, Stefano Fenoglio, Paolo Lo Conte, and Paolo Vezza. "Transferability Of Mesohabitat Suitability Criteria In Northern Italy." In Proceedings of the 39th IAHR World Congress From Snow to Sea. Spain: International Association for Hydro-Environment Engineering and Research (IAHR), 2022. http://dx.doi.org/10.3850/iahr-39wc2521711920221044.
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"Hydrological implications at mesohabitat scale on aquatic macroinvertebrates communities of Andean rivers of southern Ecuador: towards the determination of environmental flow." In 21st Century Watershed Technology Conference and Workshop Improving Water Quality and the Environment. American Society of Agricultural and Biological Engineers, 2016. http://dx.doi.org/10.13031/wtcw.2016015.
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Costarrosa, Anna, Dídac Jorda-Capdevila, Andreu Porcar, Julio C. López-Doval, Quim Pou-Rovira, Albert Herrero, Giovanni Negro, Roberta Colucci, Beatrice Pinna, and Paolo Vezza. "Suitability Models at Mesohabitat Scale of Native Freshwater Fish and Mussels for Their Application in Environmental Flows Assessment in the NE of the Iberian Peninsula." In SIBIC 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/blsf2022013138.
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Tota, A., A. B. M. Baki, A. D. Christian, A. Golpira, I. Montgomery, A. Falkenstein, and N. Orellana. "Experimental Investigation of Flow Characteristics within Mussel’s Mesohabiats." In World Environmental and Water Resources Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484258.029.
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Quadroni, Silvia, Alberto Doretto, Francesca Salmaso, Livia Servanzi, Giuseppe Crosa, and Paolo Espa. "WHAT DOES IT HAPPEN TO MESOHABITATS OF AN UPLAND STREAM AFTER A CONTROLLED SEDIMENT FLUSHING OPERATION?" In Proceedings of the 39th IAHR World Congress From Snow to Sea. Spain: International Association for Hydro-Environment Engineering and Research (IAHR), 2022. http://dx.doi.org/10.3850/iahr-39wc252171192022173.
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