A Remarkable Anomuran: The Taxon Aegla Leach, 1820. Taxonomic Remarks, Distribution, Biology, Diversity and Conservation

Bueno, Sérgio Luiz de Siqueira; Shimizu, Roberto Munehisa; Moraes, Juliana Cristina Bertacini

doi:10.1007/978-3-319-42527-6_2

Cited by 23 publications

(26 citation statements)

References 114 publications

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“…Testing those alternative scenarios is feasible in freshwater crabs of the genus Aegla (Decapoda, Aeglidae). They rarely swim (<1% of the time, Trevisan, Marochi, & Masunari, 2014) and spend most of the time crawling under rocks and leaves in headwater streams, fighting whenever they encounter a conspecific (Bueno, Shimizu, & Moraes, 2016). Hence, walking and fighting are important in aeglid life-history, and should thus influence both the size of the male claw and walking performance.…”

Section: Introductionmentioning

confidence: 99%

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Underwater compensation for exaggerated weaponry: The role of morphology and environment on crab locomotor performance

2019

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Exaggerated morphologies may increase fitness, but they might be costly to bear; heavy weight, for instance, might hinder locomotion. Evidence supporting these costs are sparse because animals that move on land or swim have traits reducing those costs, called compensatory traits. Animals that walk underwater, however, are under different environmental pressures than land animals. Buoyancy, for instance, reduces the effective weight of any object, which could decrease the locomotion costs of carrying exagerrated traits. Hence, underwater species might maintain performance without compensation. To test this, we compared males of the freshwater anomuran Aegla longirostri that bear an exaggerated claw to females (the natural control). We first tested whether the exaggerated claw decreased male locomotor performance. Next, we tested if sexual dimorphism in performance is associated with differences in leg asymmetry, length, and muscle size. Lastly, we tested if large males have proportionally heavier legs than smaller males. Unexpectedly, females are faster than males while also having relatively longer legs than males. Therefore, females might walk faster because of the longer legs, which might be unrelated to the male exaggerated claw. Furthermore, larger males did not have proportionally heavier legs than smaller males, further suggesting no compensation. Hence, even though aeglid's claw weigh ~25% of their total body weight, we did not find evidence for burden or compensation on males. The environment might thus decrease the costs of exaggerated traits.

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Section: Introductionmentioning

confidence: 99%

“…First, males' left claw is enlarged and used during fights, males' right claw is smaller and usually used for feeding (Trevisan, Marochi, Costa, Santos, & Masunari, 2012). Females, on the other hand, have smaller claws (Bueno et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Underwater compensation for exaggerated weaponry: The role of morphology and environment on crab locomotor performance

2019

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“…In recent decades, the IUCN Red List guidelines have been used to assess different taxa in a wide variety of habitats (Aars, Lunn, & Derocher, ; Malak et al, ; Nowell & Jackson, ; Oldfield, ; Squeo et al, ; Vreugdenhil et al, ), although few freshwater invertebrate species have been evaluated compared with other taxonomic groups. For example, approximately 4% of the total number of species assessed by IUCN are crustaceans (Bahamonde et al, ; Bueno, Shimizu, & Moraes, ), but at least 28% of these species are classified as being at high risk of extinction. This designation is mainly linked to habitat destruction, flow modification, sedimentation, pollution, overharvesting, introduced species, agriculture and aquaculture activities (Cumberlidge et al, ; Dudgeon et al, ; IUCN, ; Magris et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Although other researchers have assessed both the species diversity and the conservation status of the species of Aegla in southern South America (Bond‐Buckup et al, ; Bueno et al, ; Pérez‐Losada et al, ; Santos et al, ), they did not include all the species and populations analysed in the present study, nor implement the combination of approaches used here. The updated distribution of the species of Aegla includes six putative new species and was studied to set conservation priorities applying biogeographical, phylogenetic and conservation methods.…”

Section: Introductionmentioning

confidence: 99%

Selecting and ranking areas for conservation ofAegla(Crustacea: Decapoda: Anomura) in southern South America integrating biogeography, phylogeny and assessments of extinction risk

Tumini

Giri

Williner

et al. 2019

Aquatic Conservation

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1. The rapid degradation of freshwater habitats in southern South America may cause the extinction of the endemic species of Aegla, as well as other freshwater species and components of riverside environments related to them. Information on the distribution of species and their conservation status is essential for developing conservation strategies.2. The updated distribution of Aegla in its southernmost distribution was analysed in order to prioritize freshwater ecoregions, applying biogeographical, phylogenetic and conservation status and complementarity approaches. 3. The distributions of the species of Aegla were delineated on maps and plotted against freshwater ecoregions. A data matrix of areas versus species was constructed and a taxon-area cladogram was created. Ecoregions were ranked, based on their species richness and using a complementarity criterion, to create a list of those considered important for conservation. The conservation status of Aegla species was assessed on the basis of the categories and criteria of the International Union for Conservation of Nature (IUCN) to produce a decreasing order of the risk of species extinction. These assessments were combined to define a consensus ranking of the priority areas for conservation. 4. The areas of maximum species richness and endemicity, and consequently highest priority of conservation, were the Lower Parana and Patagonia ecoregions. The Cuyan Desaguadero and Mar Chiquita Salinas Grandes ecoregions were the areas of second priority, and the Chaco and Lower Uruguay ecoregions were the areas with the third priority for conservation. Ten out of the 20 species analysed fall within the threat categories of the IUCN. Sixty per cent of the species of Aegla analysed have at least one population contained in protected areas.5. The results obtained may be used to design strategies for implementing conservation policies on freshwater species, generate biogeographical atlases and contribute to selecting Ramsar sites.

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“…Aegla Leach, 1820 is the only taxon of Anomura that is fully adapted to freshwater environments (Schmitt, 1942;Bond-Buckup and Buckup, 1994;Bueno et al, 2016). As of 2016, eighty-three nominal species and subspecies have been described , all of them endemic to temperate and subtropical regions of continental South America .…”

mentioning

confidence: 99%

A new species of stygobitic aeglid from lentic subterranean waters in southeastern Brazil, with an unusual morphological trait: short pleopods in adult males

Bueno

Camargo²,

Moraes

2017

Nauplius

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A Remarkable Anomuran: The Taxon Aegla Leach, 1820. Taxonomic Remarks, Distribution, Biology, Diversity and Conservation

Cited by 23 publications

References 114 publications

Underwater compensation for exaggerated weaponry: The role of morphology and environment on crab locomotor performance

Underwater compensation for exaggerated weaponry: The role of morphology and environment on crab locomotor performance

Selecting and ranking areas for conservation ofAegla(Crustacea: Decapoda: Anomura) in southern South America integrating biogeography, phylogeny and assessments of extinction risk

A new species of stygobitic aeglid from lentic subterranean waters in southeastern Brazil, with an unusual morphological trait: short pleopods in adult males

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