Allometric Growth, Sexual Maturity, and Adult Male Chelae Dimorphism in Aegla Franca (Decapoda: Anomura: Aeglidae)

Bueno, Sérgio Luiz de Siqueira; Shimizu, Roberto Munehisa

doi:10.1651/07-2973.1

Cited by 45 publications

(49 citation statements)

References 40 publications

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“…1). Nevertheless, the same pattern regarding cumulative life stage transition at puberty molt described for A. franca (Bueno & Shimizu, 2009), can also be found in A. paulensis. In both sexes, most of the juveniles that bulked the sampled population in late winter 2009, presented itself as the youngest as well as the second most conspicuous and coexisting cohort of adults by late summer 2010.…”

Section: Discussionsupporting

confidence: 68%

Population size of Aegla paulensis (Decapoda: Anomura: Aeglidae)

Cohen

Takano

Shimizu

et al. 2013

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ABSTRACT. We used the Schumacher-Eschmeyer method for closed populations to estimate and compare the population size of adults of Aegla paulensis, from Jaraguá State Park (São Paulo, Brazil), in two periods of the year with contrasting climatic conditions (late winter and late summer). The calculated density of adult individuals was considerably higher in the summer (11.5 ind m -2 ) than in the winter (6.7 ind m -2 ). This density difference of adult individuals was attributed to variation in the population structure of coexisting cohorts of adults at each sampling season of the year, due to dissimilarities in the cumulative abundance of recruits that effectively become adults after puberty molt, and difference in longevity between sexes. Keywords: freshwater decapods, Aeglidae, population structure, mark and recapture, close population, Brazil.Tamaño poblacional de Aegla paulensis (Decapoda: Anomura: Aeglidae) RESUMEN. Se utilizó el método Schumacher-Eschmeyer para poblaciones cerradas, para estimar y comparar el tamaño poblacional de adultos de Aegla paulensis, de Jaraguá State Park (São Paulo, Brasil), durante dos períodos del año, con condiciones climáticas contrastantes (fines de invierno y fines de verano). La densidad de adultos fue considerablemente más alta en verano (11,5 ind m -2 ) que en el invierno (6,7 ind m -2). Esta diferencia en la densidad de individuos adultos fue atribuido a variaciones en la estructura poblacional de cohortes coexistentes durante cada una de las estaciones del año. Estas variaciones fueron debido a disimilaridades en la abundancia acumulativa de reclutas que efectivamente serán adultos, después de la muda de pubertad, y a diferencias en la longevidad entre los sexos. Palabras clave: decápodos de agua dulce, Aeglidae, estructura poblacional, marcaje y recaptura, población cerrada, Brasil.

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Section: Discussionsupporting

confidence: 68%

Population size of Aegla paulensis (Decapoda: Anomura: Aeglidae)

Cohen

Takano

Shimizu

et al. 2013

lajar

View full text Add to dashboard Cite

show abstract

“…Bivariate dataset (selected dependent variable vs. independent variable) were grouped according to major and minor chelae criterion. The procedure to separate data into juvenile and adult groups differed for each sex and followed the analytical procedures described in detail by Bueno and Shimizu (2009) …”

Section: Discussionmentioning

confidence: 99%

“…After all points associated with larger chelae dimensions (= morphotype II group, sensu Bueno and Shimizu, 2009) have been identified and isolated, all remaining data were used in the separation of points into juveniles and morphotype I adults (sensu Bueno and Shimizu, 2009). This time, the K-means clustering and the discriminant analysis were performed on ln[chela dimension] vs. lnCL data points.…”

Section: Allometric Growth and Sexual Maturity In Aegla Castromentioning

confidence: 99%

“…The former is associated with the puberty molt and marks the transition from the juvenile into the adult phase, whereas the latter refers to sexually matured individuals that successfully take part in the reproductive process (see López-Greco and Rodríguez, 1999 for review on sexual maturity in decapods). Allometric growth analysis has been often employed in determining the average size at the onset of morphometric maturity of aeglids species (Colpo et al, 2005;Viau et al, 2006;Bueno and Shimizu, 2009;Oliveira and Santos, 2011;Trevisan and Santos, 2012;Copatti et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Based on significant change in the allometric growth coefficient during adulthood, Bueno and Shimizu (2009) recognized two sequential adult male morphotypes (I and II) in a population of Aegla franca Schmitt, 1942: Morphotype II differed from the previous morphotype in having larger and more robust pair of chelae. Temporal variation in the proportions between morphotypes in relation to the reproductive cycle of the species indicated that morphotype II males were associated with the acquisition of functional maturity in that sex.…”

Section: Introductionmentioning

confidence: 99%

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