Premium
Effects of the evolution of the S erra do M ar mountains on the shape of the geographically isolated populations of A egla schmitti H obbs III , 1979 ( D ecapoda: A nomura)
Author(s) -
Trevisan André,
Marochi Murilo Zanetti,
Costa Marcelo,
Santos Sandro,
Masunari Setuko
Publication year - 2016
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/azo.12102
Subject(s) - carapace , biology , structural basin , univariate , multivariate statistics , zoology , ecology , crustacean , paleontology , statistics , mathematics
The Aeglidae family is a useful model for evaluating the shape variation to present small geographically isolated populations and present a carapace structure that allows precise placement of landmarks. We analysed variations of the size and shape of the carapace of seven populations of A. schmitti . We used 18 bidimensional anatomical landmarks on the carapace of adult males. Size variation between the populations was analysed through a univariate analysis of variance, while the shape variation was analysed through a multivariate analysis of variance using the configurations aligned by the generalized Procrustes analysis. The ordination of the populations was investigated through a canonical variables analysis. Individuals from the populations differed in the carapace size, in this case, we observed the largest individuals in the Iguaçu river basin, followed by Ribeira do Iguape and the Coastal basin. Carapace shape also differed between the populations of A. schmitti , with the exception of the Mato Grande and Piraquara rivers: populations from the Iguaçu River presented a larger and rounder carapace when compared with the slenderer carapace of the Coastal basin, and the Ribeira do Iguape animals presented intermediate shapes. Data from the present study show great congruency with the draining pattern and geological history of the region.