Tropical Ecology and Conservation [Monteverde Institute]

Alternative Title

La evidencia de la conducta subsocial mediante el análisis de la captura de presas y la alimentación en una nueva especie de Anelosimus (Araneae : Theridiidae)

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Publication Date

December 2007

Abstract

Sociality is a little studied, little occurring, and unique trait in spider biology. Recently, in the genus Anelosimus, where sociality has originated eight or nine times, research has shown that more quasisocial species exist at low elevations and almost all subsocial species at higher elevations. The purpose of this study was to determine the sociality of a new species of Anelosimus, and add to the knowledge base of social Anelosimus spiders. Analysis of prey capture and feeding has provided evidence for a subsocial classification. In 12 webs of a female and her offspring, juveniles coordinated efforts to capture prey. Almost all of the spiders in the web fed communally (R=0.97; p=.0001). Juveniles more adeptly captured prey smaller than their body size prey, and spent longer capturing prey larger than their body. Other natural history aspects of these spiders were described, including guarding of egg sacks, web heights of 0.2m-2.3m, and tendency of webs to be found on tips of branches. With as much knowledge as to the extent of sociality in Anelosimus, we may be able to accurately analyze trends, and provide insight into the mechanisms of evolution and their origins. El comportamiento social en las arañas es poco frecuente y estudiado, así mismo parece estar ligado a un único rasgo en la biología de las arañas. Recientemente, en el genero Anelosimus donde el comportamiento social se ha originado ocho o nueve veces, las investigaciones han demostrado que mas especies cuasi sociales se encuentran a elevaciones bajas y casi todas las especies subsociales a mayores elevaciones. El propósito de este estudio fue determinar el grado de sociabilidad en una nueva especie de Anelosimus y añadir mas conocimiento a la base de sociabilidad en este genero de araña.

Keywords

Spiders--Behavior, Arañas--Comportamiento, Predator and prey, Depredador y presa, Costa Rica--Puntarenas--Monteverde Zone--Monteverde, Costa Rica--Puntarenas--Zona de Monteverde--Monteverde, CIEE Fall 2007, CIEE Otoño 2007

Description

Student affiliation : Department of Biology, Indiana University Bloomington Born Digital

Subject: topical

Spiders--Behavior; Arañas--Comportamiento; Predator and prey; Depredador y presa; CIEE Fall 2007; CIEE Otoño 2007

Subject: geographic

Costa Rica--Puntarenas--Monteverde Zone--Monteverde; Costa Rica--Puntarenas--Zona de Monteverde--Monteverde

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00423

Evidence of subsocial behavior through analysis of prey capture and feeding in a new species of Anelosimus (Araneae : Theridiidae)

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