Geometric morphometrics of carapace of<i>Macrobrachium australe</i>(Crustacea: Palaemonidae) from Reunion Island

Zimmermann, Gabrielle; Bosc, Pierre; Valade, Pierre; Cornette, Raphäel; Améziane, Nadia; Debat, Vincent

doi:10.1111/j.1463-6395.2011.00524.x

Cited by 35 publications

(27 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fishing efficiency can also explain that we observed weak preferences for A. innocous , which is an excellent swimmer and very reactive in the presence of predators (Covich et al ., ; Hein and Crowl, ) or when disturbed by electrofishing (Fiévet et al ., ). Regarding the shrimp M. australe , its weak regional preferences can be explained by its sheltering behaviour during the day and variation due to its morphological plasticity (Zimmermann et al ., ). The grouping of juveniles of different species of Macrobrachium is probably not very appropriate because we observed that the adults of M. faustinum and M. heterochirus have different preferences (forces and directions) regarding velocity and depth.…”

Section: Discussionmentioning

confidence: 97%

Hydraulic Preferences of Shrimps and Fishes in Tropical Insular Rivers

Girard

Monti²,

Valade³

et al. 2013

River Res. Applic.

View full text Add to dashboard Cite

Hydraulic habitat models based on the preferences of species for the hydraulic characteristics of their microhabitats are frequently used to evaluate the impact on the habitat of a change in river flow regime. Their application in a tropical insular environment is still limited as little is known about the hydraulic preferences of species. Hydraulic preference models have been developed for 15 taxa (diadromous shrimps and fishes) sampled in 52 rivers in the Caribbean (the French West Indies) and the Indian Ocean (the Reunion island). Five datasets were used and group 8353 samples collected by electrofishing during 320 surveys (reach × date) performed between 1999 and 2011. Generalized additive models were used to link variations of taxa density within surveys to the hydraulic characteristics of the microhabitat (velocity, depth and substrate). Hydraulic preferences within each region (Caribbean and Indian Ocean) are significant for most of the taxa and vary little between rivers and surveys. The hydraulic variables explain up to 18.1% (univariate models) and 30.0% (multivariate models) of the deviance of densities within survey. Of the taxa selected, Atya scabra, Macrobrachium heterochirus, Xiphocaris elongata and the Sicydiinae are the most demanding. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Section: Discussionmentioning

confidence: 97%

Hydraulic Preferences of Shrimps and Fishes in Tropical Insular Rivers

Girard

Monti²,

Valade³

et al. 2013

River Res. Applic.

View full text Add to dashboard Cite

show abstract

“…A pattern of shape variation according to water velocity was reported by Giri & Loy () for A. neuquensis and Zimmermann et al . () for Macrobrachium australe . In the present study, considering the whole population, we did not find any environmental pattern in A. uruguayana .…”

Section: Discussionmentioning

confidence: 99%

Clinal variation in carapace shape in the South American freshwater crab,Aegla uruguayana(Anomura: Aeglidae)

Giri

Collins

2014

Biol J Linn Soc Lond

View full text Add to dashboard Cite

South America has been influenced by different geoclimatic events ever since its separation from Africa. The inland water fauna has evolved in response to the changing landscape. Currently, there are indications of variations in populations, occurring to different degrees that would indicate a clinal pattern in morphology. Among South America's fauna, the freshwater anomuran, Aegla, is an enigmatic group as a result of its endemicity and is composed of only one genus. Of all the species in this family, Aegla uruguayana has the broadest distribution. Its native habitats have been influenced by several marine transgressions during the Miocene-Quaternary Periods; thus, it is likely that their current distribution has been more recent. Its habitat spreads across a number of isolated basins and sub-basins that display distinct degrees of isolation/connection, making clinal variation patterns in the morphology of this species possible. The present study aimed to evaluate the pattern of carapace shape variation in A. uruguayana and how it relates to the isolation and/or connection of populations from different basins and sub-basins, allowing the determination of any extant clinal patterns. The specimens studied belong to 25 separate populations, representing all areas in which the species currently exists. A total of 523 crabs were analyzed. We identified 13 landmarks and four semi-landmarks in the carapace. The aeglids were divided into seven size intervals to avoid an allometry effect. In each size category, shape relationships analyzed by principal component analysis suggest a geographical pattern corresponding to the distribution of the populations studied. An evaluation of covariation between body shape and geographical coordinates reveals a strong pattern and shows that population distribution had a significant effect on species morphology. Additionally, according to covariance analysis, the variation in shape was not associated with the environmental variables studied. We observed a clinal pattern throughout the species distribution, which could be attributed to genetic drift. It is possible that this process is being amplified by the geographical isolation of the basins, differences in environmental characteristics, and low dispersal ability.

show abstract

“…Previous studies have used GM to compare populations of several species of freshwater decapods (Giri and Collins 2004;Giri and Loy 2008;Barrı´a et al 2011;Idaszkin et al 2013). However, the use of GM to study prawns is still rare (Bissaro et al 2012;Zimmermann et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Geometric morphometric analysis of the freshwater prawn Macrobrachium borellii (Decapoda: Palaemonidae) at a microgeographical scale in a floodplain system

Torres

Giri

Collins

2014

Ecological Research

View full text Add to dashboard Cite

Morphometric studies are useful for delineating the shapes of various populations and species over geographical ranges and as evidence of regional differences in crustaceans. Hydrological fluctuations in a floodplain system modulate the dispersal and presence of decapods among habitats and constitute an important macrofactor that regulate other environmental variables and which could explain the richness, distribution and abundance of organisms that live in these systems. Morphological variations among populations of the freshwater prawn Macrobrachium borellii in a floodplain system at a microgeographical scale were studied using geometric morphometrics. Carapace structure was represented using 16 digitised landmarks. Allometry and sexual dimorphism was tested. Variation in shape was explored via Principal Component Analysis. Canonical Variate Analyses was applied to compare the differences in shape between species’ populations. The correlations and covariations among shapes and hydrometric level, current velocity, geographical location and hydrologic distances were analysed. The average carapace shape was different between sexes in all sites. Populations that were near each other in terms of hydrological distance had similar shapes, but all of the populations differed in shape from the farthest population. The environmental variables were not good predictors of the carapace shape. Instead, the shape was strongly related to the hydrologic distance and geographical location. The swimming characteristics of these prawns and their passive movements, together with the dynamics of a floodplain system, explain the low morphological variation between populations in this study. The dynamic characteristics of the system influence the dispersal of the prawns and allow populations to remain connected.

show abstract

Geometric morphometrics of carapace ofMacrobrachium australe(Crustacea: Palaemonidae) from Reunion Island

Cited by 35 publications

References 31 publications

Hydraulic Preferences of Shrimps and Fishes in Tropical Insular Rivers

Hydraulic Preferences of Shrimps and Fishes in Tropical Insular Rivers

Clinal variation in carapace shape in the South American freshwater crab,Aegla uruguayana(Anomura: Aeglidae)

Geometric morphometric analysis of the freshwater prawn Macrobrachium borellii (Decapoda: Palaemonidae) at a microgeographical scale in a floodplain system

Contact Info

Product

Resources

About