Effect of Environmental Variables on the Distribution of Two Freshwater Crabs (Anomura: Aeglidae)

Bücker, Francielle; Bond‐Buckup, Georgina; Gonçalves, Raoni da Silva; Melo, Adriano S.

doi:10.1163/20021975-99990371

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…Several studies showed that the assemblages and distribution of the benthic macroinvertebrates, and their species richness, were usually extremely dependent on habitat heterogeneity (Fiévet et al, 2001;Able et al, 2002;Fossati et al, 2002;Arimoro et al, 2007, Bücker et al, 2008.…”

Section: Discussionmentioning

confidence: 99%

Ecology and diversity of freshwater shrimps in Banco National Park, Côte d’Ivoire (Banco River Basin)

Camara

Konan

Diomande

et al. 2009

Knowl. Managt. Aquatic Ecosyst.

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Shrimps are an important component of river invertebrate assemblages in tropical freshwater where they are a controlling group in food webs. In order to determine shrimp diversity in the Banco Basin (Côte d'Ivoire, West Africa) and examine whether the patterns of species distribution were related to environmental conditions, six sites were monitored. Sampling was conducted in 2008 during February, May, September and November using a long-handled net (25-cm diameter, 2-mm mesh). For each site, we measured environmental variables (conductivity, pH, water temperature, dissolved oxygen, turbidity, current speed, and water depth and width). Three shrimp species, Macrobrachium thysi (Powell 1980), Macrobrachium dux (Lenz 1910) and Desmocaris trispinosa (Aurivillius 1898) were identified. D. trispinosa was the largest distributed (more than 50% of occurrence) and the most abundant (67% of total number of specimens caught). It was followed by M. thysi with 47% and 32% of occurrence and abundance, respectively. Canonical correspondence analysis (CCA) showed a spatial distribution of the shrimp community, significantly influenced by width, depth, conductivity, type of substrate, turbidity and dissolved oxygen. Due to the fact that the Banco River hosts an endemic species in Côte d'Ivoire (Macrobrachium thysi), the conservation of integrity of this basin was recommended. canonique des correspondances montre que la distribution spatiale des crevettes dans le bassin du Banco est fortement influencée par la largeur, la profondeur, la conductivité, le type de substrat, la turbidité et l'oxygène dissous. Compte tenu du fait que la rivière Banco héberge une espèce endémique à la Côte d'Ivoire (Macrobrachium thysi), la conservation de l'intégrité de ce bassin est fortement recommandée. RÉSUMÉ

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Section: Discussionmentioning

confidence: 99%

Ecology and diversity of freshwater shrimps in Banco National Park, Côte d’Ivoire (Banco River Basin)

Camara

Konan

Diomande

et al. 2009

Knowl. Managt. Aquatic Ecosyst.

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“…As an adaptation to the freshwater environment, aeglids have direct development, without larval phases after hatching, and live approximately 2.5 years (Bond‐Buckup, Bueno & Keunecke, ; Cohen et al ., ). These animals are usually found hidden under stones, in well‐oxygenated water bodies, and the presence of coarse particulate organic matter and fragmented leaves also contributes to the occurrence of Aegla (Bücker et al ., ; Dalosto & Santos, ). Individuals of A. longirostri can use the leaves available in the stream for consumption, suggesting their participation on the processing of allochthonous plant material, and also feed on larvae and adults of insects and other animals (Santos et al ., ; Cogo & Santos, ).…”

Section: Methodsmentioning

confidence: 98%

Intraspecific variation inAegla longirostri(Crustacea: Decapoda: Anomura) revealed by geometric morphometrics: evidence for ongoing speciation?

Marchiori

Bartholomei-Santos

Santos

2014

Biol J Linn Soc Lond

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Genetic divergences among populations of Aegla longirostri suggest that this group may be formed by cryptic species. In this study, we analysed the carapace shape of six populations of A. longirostri from southern Brazil, using a geometric morphometric approach, to better elucidate the species' systematics. Our results were congruent with the genetic data, meaning that genetically differentiated populations were also morphogeometrically differentiated. The geometric morphometric descriptors showed significant differences in carapace shape among all populations. Geographical distance and isolation may be affecting the gene flow between populations, leading to divergence in both genetic and morphometric traits. Our data indicate the possible existence of cryptic species within A. longirostri, or an incomplete process of speciation. Geometric morphometric methods were efficient in differentiating among populations that do not show divergence in diagnostic characters.

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“…There are more than 80 species identified for the genus Aegla , many of which inhabit headwaters and present a high level of endemism (Moraes et al, ; Santos et al, ; Santos et al, ; Santos, Jara, Bartholomei‐Santos, Pérez‐Losada, & Crandall, ). In addition, aeglids are indicators of good environmental conditions owing to their role in allochthonous material fragmentation (Bücker, Gonçalves, Bond‐Buckup, & Melo, ; Cogo & Santos, ) and their high demand for oxygenated water (Dalosto & Santos, ). These characteristics make the family a good candidate for identifying priority areas for freshwater conservation at a local scale.…”

Section: Introductionmentioning

confidence: 99%

Priority areas for conservation within four freshwater ecoregions in South America: A scale perspective based on freshwater crabs (Anomura, Aeglidae)

Gonçalves

Costa

Bond‐Buckup

et al. 2018

Aquatic Conservation

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1. Although freshwater ecosystems contain high biodiversity and provide valuable ecosystem services, they are severely threatened worldwide. Many broad-scale approaches to conserve freshwater environments have been proposed, but as headwaters tend to host higher levels of biodiversity, identifying priority areas for conservation at a local scale is essential.2. An integrative three-step framework is proposed to recognize such areas, using anomuran crabs of the family Aeglidae as biodiversity indicator taxa, within four freshwater ecoregions in South America. First, the knowledge on the distribution of species occurring within the study area was updated and the species conservation status assessed. Second, species distribution modelling was used to identify areas of high richness and endemism. Third, these areas were compared with the existing protected area network, in addition to land-use and urban information, to indicate priority areas for conservation within four freshwater ecoregions (Laguna dos Patos, Upper Uruguay, Lower Uruguay, Tramandaí and Mampituba) studied at a local scale.3. Analysis of the distribution of species of the genus Aegla showed that the present protected area network poorly covers freshwater habitats within the study region.Three priority areas for conservation were identified, with high levels of endemism and richness of aeglid species. These areas are mainly located close to current protected areas, and we suggest, therefore, that the enlargement of some protected areas, through the establishment of corridors, would better protect several species with distributions restricted to headwaters, such as macroinvertebrates and fishes, some of which are threatened with extinction.

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Effect of Environmental Variables on the Distribution of Two Freshwater Crabs (Anomura: Aeglidae)

Cited by 12 publications

References 17 publications

Ecology and diversity of freshwater shrimps in Banco National Park, Côte d’Ivoire (Banco River Basin)

Ecology and diversity of freshwater shrimps in Banco National Park, Côte d’Ivoire (Banco River Basin)

Intraspecific variation inAegla longirostri(Crustacea: Decapoda: Anomura) revealed by geometric morphometrics: evidence for ongoing speciation?

Priority areas for conservation within four freshwater ecoregions in South America: A scale perspective based on freshwater crabs (Anomura, Aeglidae)

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