Estrutura populacional de Aegla schmitti (Crustacea: Anomura: Aeglidae) nos reservatórios dos Mananciais da Serra, Piraquara, Paraná, Brasil

Teodósio, Érico Augusto Oliveira; Masunari, Setuko

doi:10.1590/s1984-46702009000100004

Cited by 25 publications

(21 citation statements)

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“…Thus, our data agree with the pattern known for other Brazilian species of Aegla, where the reproduction is either year-round with peaks in the colder months , COLPO et al 2005, or just concentrated in the colder months (TEODÓSIO & MASUNARI 2009, GRABOWSKI et al 2013, including GB. The frequency of juveniles also follows a similar pattern: juveniles were captured year-round, being more abundant in the spring following the peak of the reproductive season (BUENO & BOND-BUCKUP 2000) (Fig.…”

Section: Bond-buckupsupporting

confidence: 90%

“…Once again, the effect of the sampling method makes it difficult to distinguish between actual differences between the species/populations, and the effects of the different sampling methods chosen by each author. The tendency to capture more large adult males using traps had already been demonstrated in crayfish surveys (BEATTY et al 2004(BEATTY et al , 2011, and it is relatively safe to infer that the same is true for aeglids (BUENO et al 2007, TEODÓSIO & MASUNARI 2009, GRABOWSKI et al 2013. In this study, however, when analyzing the sex ratio of aeglids captured by hand-net and by traps (Fig.…”

Section: Bond-buckupsupporting

confidence: 47%

“…Nevertheless, these characteristics are shared by most Aegla species studied so far (e.g., FRANSOZO et al 2003, GONÇALVES et al 2006, TEODÓSIO & MASUNARI 2009, and thus, cannot be considered a species-specific characteristic. Conversely, the maximum size, sexual dimorphism, sex ratio and population density clearly differed between the two populations.…”

Section: Bond-buckupmentioning

confidence: 99%

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Population biology of Aegla platensis (Decapoda: Anomura: Aeglidae) in a tributary of the Uruguay River, state of Rio Grande do Sul, Brazil

Dalosto

Palaoro

Oliveira

et al. 2014

Zoologia (Curitiba)

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ABSTRACT. Aeglids are freshwater anomurans that are endemic from southern South America. While their population biology at the species-level is relatively well understood, intraspecific variation within populations has been poorly investigated. Our goal was to investigate the population biology of Aegla platensis Schmitt, 1942 from the Uruguay River Basin, and compare our data with data from other populations. We estimated biometric data, sex ratio, population density and size-class frequencies, and frequencies of ovigerous females and juveniles, from the austral spring of 2007 until autumn 2008. Sexual dimorphism was present in adults, with males being larger than females. Furthermore, males and females were significantly larger than previously recorded for the species. The overall sex ratio was 1.33:1 (male:female), and population density ranged from 1.8 (spring) to 3.83 ind.m -² (winter). Data from this population differ from published information about A. platensis in almost all parameters quantified except for the reproductive period, which happens in the coldest months, and a population structure with two distinct cohorts. Difference among studies, however, may be in part due to methodological differences and should be further investigated in order to determine their cause. In addition to different methodologies, they may result from ecological plasticity or from the fact that the different populations actually correspond to more than one species.

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Section: Bond-buckupsupporting

confidence: 90%

Section: Bond-buckupsupporting

confidence: 47%

Section: Bond-buckupmentioning

confidence: 99%

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Population biology of Aegla platensis (Decapoda: Anomura: Aeglidae) in a tributary of the Uruguay River, state of Rio Grande do Sul, Brazil

Dalosto

Palaoro

Oliveira

et al. 2014

Zoologia (Curitiba)

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“…The size difference between the larger males and the smaller females is the most common feature of aeglid populations from southeastern and southern Brazil: Aegla laevis laevis Latreille, 1818 (Bahamonde andLópez, 1961), Aegla paulensis Schmitt, 1942(López, 1965Cohen et al, 2011), Aegla perobae Rodrigues, 1977 (Rodrigues andHebling, 1978) Rossi, 1977 (Noro andBuckup, 2003), Aegla longirostri Bond- Buckup, 1994 (Colpo et al, 2005), Aegla franciscana Rossi, 1977 (Gonçalves et al, 2005), Aegla schmitti Hobbs III, 1979 (Teodósio andMasunari, 2009) and Aegla manuinflata Bond- Santos, 2009 (Trevisan and. The sole exception to this pattern is Aegla platensis Schmitti, 1942 from Rio Grande do Sul State (Bueno et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Sexual dimorphism in Aegla marginata (Decapoda: Anomura)

et al. 2012

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A study on sexual dimorphism in Aegla marginata was conducted using geometric morphometric methods. The carapace of 47 females and 75 males and the left and right cheliped propodus of 29 females and 40 males were analyzed. Eighteen landmarks were established in the carapace and 10 in the cheliped propodus. A Generalized Procrustes Analysis based on landmark configurations was used to separate the components of size and shape. A Student t-test was used to determine whether statistically significant sexual dimorphism was shown by the carapace and the cheliped propodus. The variation in the shape of the structures was evaluated with a discriminant analysis. Our results show that there is no sexual dimorphism in the carapace of A. marginata. However, the size of the propodus differed statistically between the sexes. The carapace shape differed between the sexes: the females showed a wider posterior area and a narrower anterior area than the males. The shape of the cheliped propodus also differed between the sexes: overall, the females had a longer and narrower cheliped propodus than the males. The variations in the carapace shape found in this study confirm the results of other studies on aeglid morphology; however, the information presented by this study regarding variation in the shape of the cheliped propodus is new to the literature. The geometric morphometric approach applied in this study provided useful tools for achieving the proposed objectives.

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“…We measured the following morphological structures: carapace length (CL) and carapace width (CW), length of the right (RCL) and left chelae (LCL), height of the right (RCH) and left chelae (LCH), and abdomen length (ABL) (length of the somites 5 and 6, including the telson) ( Fig. 1) (Colpo et al, 2005;Teodósio and Masunari, 2009;.…”

Section: Measurementsmentioning

confidence: 99%

Allometry and sexual dimorphism of the Neotropical freshwater anomuran Aegla marginata Bond-Buckup & Buckup, 1994 (Crustacea, Anomura, Aeglidae)

Silva

Paciencia²,

Bispo

et al. 2017

Nauplius

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Th is study analyzes ontogenetic allometry in Aegla marginata Bond-Buckup & Buckup, 1994, a freshwater crustacean, in order to evaluate the growth patt ern and the presence of sexual dimorphism, using a multivariate approach. Th e specimens were sampled from streams in Intervales State Park, São Paulo State, Brazil. For each specimen, we measured the following structures: carapace length and width, chelae height and length, and abdomen length. Allometry was evaluated using Jolicoeur's multivariate allometric coeffi cient. Our results showed that for females, ABL (abdomen length) and LCH (left chelae heigh) presented positive allometry; LCL (left chelae length) and RCH (right chelae heigh) isometry; and CL (carapace length), CW (carapace width), and RCL (right chelae length) negative allometry. For males, RCH, LCH, and LCL presented positive allometry; RCL (right chelae length) isometry; and CL, CW, and ABL negative allometry. In addition, sexual dimorphism was amplifi ed with body size. keY wordsMultivariate allometric coeffi cient, relative growth, energy investment, sexual selection. Silva et al. 2Allometry and sexual dimorphism of Aegla marginata Nauplius, 25: 2017016

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Estrutura populacional de Aegla schmitti (Crustacea: Anomura: Aeglidae) nos reservatórios dos Mananciais da Serra, Piraquara, Paraná, Brasil

Cited by 25 publications

References 1 publication

Population biology of Aegla platensis (Decapoda: Anomura: Aeglidae) in a tributary of the Uruguay River, state of Rio Grande do Sul, Brazil

Population biology of Aegla platensis (Decapoda: Anomura: Aeglidae) in a tributary of the Uruguay River, state of Rio Grande do Sul, Brazil

Sexual dimorphism in Aegla marginata (Decapoda: Anomura)

Allometry and sexual dimorphism of the Neotropical freshwater anomuran Aegla marginata Bond-Buckup & Buckup, 1994 (Crustacea, Anomura, Aeglidae)

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