Summary of Abstract Submission

Abstract Submission No. IO50-09-0069PresentationPoster

ALLOMETRIC RELATIONSHIPS IN TWO ROCK CRABS (FAMILY OZIIDAE AND PILUMNIDAE) FROM GOA, WEST COAST OF INDIA

Deepeeka Kaullysing*1, Vinay P Padate2, Chandrashekher U Rivonker3

1 University of Mauritius, Mauritius
2 Goa University, India
3 Goa university, India

ABSTRACT :

Brachyuran crabs are among the major faunal groups occurring in aquatic ecosystems. Among the brachyuran, crabs of the Families Oziidae and Pilumnidae occupy varied niches in the coastal and inshore habitats and exhibit diverse feeding strategies. The study of body dimensions and their inter-relations (allometry) enables to differentiate between cryptic species, assessment of population structure, temporal variations in population, social behaviour, and the influence of environmental conditions on different species. This work attempts to study the allometric relations among the body dimensions of two rock crabs - Epixanthus frontalis and Heteropanope glabra - collected from Cacra beach, Goa, India. Identification was based on conventional methods employing adult morphology and Scanning Electron Microscopy (SEM) of the male first gonopod (G1). Morphometric parameters of the crabs such as carapace width (CW), carapace length (CL), overall length of major cheliped (ChL) and third maxilliped ischium length (IL) were used to determine allometric relationships among the body dimensions. A linear relationship among body parameters of specimens of both sexes was obtained suggesting a proportionate growth in body dimensions. In decapods, the allometric growth of different body parts is often related to a change of their function through ontogenesis. This was evident from the significant positive correlation between all the morphological parameters in the case of E. frontalis. However, in case of H. glabra, the lesser significant correlation between the dimensions of chelipeds and carapace suggests differential growth rates of body parts either due to post-ecdysis regeneration or regeneration of autotomized parts.