Foregut ossicles morphology and feeding of the freshwater anomuran crab <i>Aegla uruguayana</i> (Decapoda, Aeglidae)

Williner, Verónica

doi:10.1111/j.1463-6395.2009.00416.x

Cited by 13 publications

(15 citation statements)

References 48 publications

(63 reference statements)

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“…As mentioned above, A. uruguayana has a preference—within its omnivorous diet—for plant remains and algae (Williner, ), which could justify the great amylase activity recorded in second place, after lipase activity. Amylase is a carbohydrase that hydrolyses the α‐D (1,4) glycosidic linkages in polysaccharides such as starch, amylopectin, and glycogen, releasing oligomers and glucose monomers.…”

Section: Discussionmentioning

confidence: 99%

“…Within these, although the anomuran crab Aegla uruguayana and the prawn Macrobrachium borellii are omnivores; both have preferences for different items. Plant remains and algae are preferred for A. uruguayana , while M. borellii prefers oligochaetes and dipterous larvae (Collins & Paggi, ; Williner, ). Both species cohabit in inland waters of the Paraná River system; however each one seems to have a preference for different sectors.…”

Section: Introductionmentioning

confidence: 99%

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Development of enzymes during ontogeny of two freshwater Decapoda:Aegla uruguayana(Aeglidae) andMacrobrachium borellii(Palaemonidae)

et al. 2018

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The similarities or differences among species of the same family or among different families suggest a relationship with their feeding habits or a preference for the various types of food. The aim of this study was to identify the presence of digestive enzymes lipases, total protease, amylases and cellulose, and the effects of sex and size in these activities in two decapod freshwater crustaceans. Specimens of different sizes and sexes of Aegla uruguayana and Macrobrachium borellii were collected in the natural environment. In laboratory, enzymatic preparation consisted in homogenising the digestive gland in a buffer Tris‐HCl. The homogenates were centrifuged and the lipid layer was removed. Enzyme activities were determined using standard protocols. There were no statistically significant differences between sexes in any of the species under study. However, there were changes in the activity of amylases during the ontogeny of A. uruguayana, indicating that in juveniles the values of said activity are significantly higher than in the rest of the groups. M. borellii showed ontogenetic differences in total proteinase activity: organisms of range 2 (intermediate sizes) presented enzymatic activities much smaller than organisms of range 4 (larger sizes). The comparisons of enzymatic activities between both species yielded significant differences, being higher the values in the species A. uruguayana with respect to M. borellii. The results obtained in this work indicate that although both species are omnivorous and consume similar items, the activity of these digestive enzymes could be an evidence of different strategies of utilisation of the resource.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of enzymes during ontogeny of two freshwater Decapoda:Aegla uruguayana(Aeglidae) andMacrobrachium borellii(Palaemonidae)

et al. 2018

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“…The food should be providing the necessary nutrients to allow growth, storage, and reproduction (Karasov & Martinez del Río 2007). While, the variation of the trophic spectrum due to conductivity was not significant at the functional level, it could be reflected at the species levels that were used as prey or food, or at the significance level according to the method used (Williner 2010). Stomach content analysis revealed no significant diet differences between juvenile and adult prawns that fed on a variety of food comprised mainly of plant remains, algae, zooplankton, oligochaeta, insect larvae and detritus.…”

Section: Discussionmentioning

confidence: 99%

“…This characteristic regulates the flow of energy and the recycling of nutrients (Evans-White et al 2001, Buck et al 2003, Williner 2010. Omnivory was observed in other decapods of freshwater environments in the same region, such as the prawns M. borellii and P. argentinus, the freshwater crab Dilocarcinus pagei (Stimpson, 1861), and the freshwater anomuran Aegla uruguayana (Schmitt, 1942) (Collins & Paggi 1998, Collins 1999, Williner & Collins 2002, Williner 2010. All these species live in environments with abundant organic matter mainly it come from to aquatic plants.…”

Section: Discussionmentioning

confidence: 99%

“…quantity of produced waste. By including plants as a food source, decapods display a strategy that utilizes readily available food in the environment and eliminates the need to search for other food sources (Wolcott & O'Connor 1992, Williner 2010). This abundant energy resource could be available immediately to the upper levels of the food web.…”

Section: Discussionmentioning

confidence: 99%

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Trophic ecology of the freshwater prawn, <i>Pseudopalaemon bouvieri</i> (Decapoda: Palaemonidae) in Northeastern Argentina, with remarks on population structure.

Carnevali

Collins

Neiff

2012

RBT

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Abstract:Freshwater decapod crustaceans are important components of food webs in these environments, but little is known about the diet of species that live in tropical waters. We studied the feeding ecology of the prawn Pseudopalaemon bouvieri and its population structure in two different areas with six lagoons, with a different composition and abundance of aquatic macrophytes. At each site of macrophytes banks, 18 prawns sample was collected with a hand net (1mm mesh size) from 1m². In the laboratory, prawns cephalothorax length was measured, sex determined, and a total of 208 stomachs were examined for food items. Our results showed that the population abundance varied between 10 ind/m 2 and 1 411 ind/m 2 . The cephalothorax length ranged between 6mm and 21mm, and the male:female ratio varied between 0.3 and 1.0, with a higher proportion of ovigerous females (21%) in area one than area two. P. bouvieri is omnivorous, and its diet was principally based on algae, plant remains, Protozoa, Rotifera, Oligochaeta, Crustacea, Insecta, detritus and other items. The analysis of the stomach content did not reveal any significant difference in the diet between juveniles and adults, and males and females of both areas consumed a similar diet (Kruskal-Wallis test p=0.8273). We concluded that the dietary items consumed by prawns and the niche breadth were similar between the two areas, although the proportion of items consumed varied between lagoons of both areas. The density of P. bouvieri was different between areas, but the size of cephalothorax (CL) was similar. Rev. Biol. Trop. 60 (1): 305-316. Epub 2012 March 01.

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Selecting and ranking areas for conservation of Aegla (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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Foregut ossicles morphology and feeding of the freshwater anomuran crab Aegla uruguayana (Decapoda, Aeglidae)

Cited by 13 publications

References 48 publications

Development of enzymes during ontogeny of two freshwater Decapoda:Aegla uruguayana(Aeglidae) andMacrobrachium borellii(Palaemonidae)

Development of enzymes during ontogeny of two freshwater Decapoda:Aegla uruguayana(Aeglidae) andMacrobrachium borellii(Palaemonidae)

Trophic ecology of the freshwater prawn, <i>Pseudopalaemon bouvieri</i> (Decapoda: Palaemonidae) in Northeastern Argentina, with remarks on population structure.

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

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