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Journal Article

Spatial Distribution of Lycosa Tarentula Fasciiventris (Araneae, Lycosidae) in a Population from Central Spain

Carmen Fernández-Montraveta, Rafael Lahoz-Beltra and Joaquin Ortega
The Journal of Arachnology
Vol. 19, No. 2 (1991), pp. 73-79
Stable URL: http://www.jstor.org/stable/3705651
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Spatial Distribution of Lycosa Tarentula Fasciiventris (Araneae, Lycosidae) in a Population from Central Spain
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Abstract

The burrow spatial distribution pattern in a population of Lycosa tarentula fasciiventris from central Spain was studied. The developmental stage of the individual occupying the burrow, as well as the burrow spatial coordinates were measured during the spring and summer. A three-dimensional distribution pattern was obtained and Morisita, mean-crowding and variance-mean coefficient indices of burrow density were calculated. The burrow distribution pattern changed throughout the study period. Subadult burrow location shows a tendency toward instability whereas location stability of adult individuals is greater. In both cases there is a tendency towards clumping, which is lesser in the case of adult animals: if mean distances among burrows are compared between clumps, a tendency towards regularity results in the latter case. The observed distribution pattern might be a result of interspecific competition leading to a territorial system, with adult females constituting the structural support of the population. /// Hemos estudiado el patrón de distribución espacial de una población de Lycosa tarentula fasciiventris del centro de España. Durante la primavera y el verano, se midieron las coordenadas espaciales de los nidos, así como la fase de desarrollo del individuo que lo ocupaba. A partir de los datos, se ha reconstruido el patrón tridimensional de distribución, y se han calculado los índices de Morisita y mean-crowding, así como el cociente varianza-media de la densidad de los nidos. A lo largo del período de estudio se observa una modificación en el patrón de distribución de los nidos. Los nidos de los individuos subadultos muestran una tendencia a la inestabilidad, mientras que los ocupados por individuos adultos tienen una localización más estable. En ambos casos, se observa una tendencia a la agregación, que es menos marcada para los individuos adultos: si se comparan las distancias medias entre los nidos dentro de cada agregado, aparece una tendencia a la regularidad en el último caso. El patrón de distribución espacial podría ser el resultado de la competición intraespecífica, que determinaría un sistema de tipo territorial, siendo las hembras adultas el soporte estructural de la población.

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