Publication Date: 2015.
Allocosa brasiliensis is a sand-dwelling wolf spider that constructs burrows along the coasts of rivers, lakes and the Atlantic Ocean in Argentina, Brazil and Uruguay. This species shows a reversal in typical sex roles in spiders: females wander searching for males and initiate courtship, while both females and males are selective when taking mating decisions. Females prefer to mate with males that show long burrows. As burrow digging in the sand seems to be an energetically expensive activity, we would expect differences in burrow characteristics according to developmental stage and selection pressures. Our aim was to describe female and juvenile digging behavior in A. brasiliensis and report burrow dimensions, comparing the results with data available for males of this species. We placed each individual (n = 30 of each category) in glass cages with sand as substrate and recorded burrow construction under laboratory conditions. Only five females and nine juveniles constructed burrows after 72 hours. Burrow dimensions did not show significant differences between females or juveniles, but burrow length was markedly lower that reports for males of this species. Burrow digging was stereotyped both in females and juveniles, following a sequence of behavioral units repeated in a cycle. Digging behavior would be highly conserved in A. brasiliensis. However, variations in burrow digging behavior and final burrow dimensions would reflect differences in strategies according to sex and stage.
Author affiliation: de Simone, Gabriel Alejandro. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biologia Experimental y Aplicada; Argentina
Author affiliation: Aisenberg, Anita Diana. Inst. Investigaciones Biológicas Clemente Estable;
Author affiliation: Peretti, Alfredo Vicente. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
Repository: CONICET Digital (CONICET). Consejo Nacional de Investigaciones Científicas y Técnicas