Nom du corpus

Corpus Systématique Animale

Titre du document

Competitive mechanisms in a food-limited species: relative importance of interference and exploitative interactions among labyrinth spiders (araneae: Araneidae)

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Arthropodes_v2b_01456
Auteur(s)
  • David H. Wise
Affiliation(s)
  • Department of Biological Sciences, University of Maryland Baltimore County (UMBC), 21228, Catonsville, MD, USA
Résumé

Field experiments were conducted to clarify the relationship between the extent of food limitation and the amount and nature of intraspecific competition in an orb weaver, the labyrinth spider Metepeira labyrinthea. In one experiment agonistic encounters between marked adult females were induced at natural web sites. In other experiments populations were established by adding spiders to standardized, open experimental units in the spider's natural habitat. Replicate low and high density populations of marked adult females were established in one study. The other density manipulation was with immature spiders and incorporated a third treatment in which prey availability was increased over ambient levels. The larger female gained control of the web in 76% of the induced encounters. Resident status of the spider did not significantly influence the outcome of a contest. Apparently labyrinth spiders will spontaneously invade webs, since some females in the density-manipulation experiment appeared in recently occupied webs of other spiders. Despite this evidence of interference competition and indirect evidence that prey scarcity limited fecundity, neither survival nor egg production was lower at higher spider densities. The experiment with juvenile spiders provided direct experimental evidence that prey were scarce for M. labyrinthea. Spiders that received supplemental food were significantly larger at the end of the experiment than those that fed at natural prey levels only (24±3 mg versus 15±2 mg, respectively). However, density of immature spiders did not affect their growth or survival. The labyrinth spider appears to be a food-limited species in which exploitative competition for food is weak or absent. Most spiders never build webs close enough together to interfere indirectly with each other's prey capture. Occurrence of aggressive interactions between some females suggests that territorial behavior may lead to spacing patterns that eliminate exploitative competition. This hypothesis is evaluated and it is concluded that other factors better explain the absence of exploitative competition among most M. labyrinthea. Aggressive encounters occur between some labyrinth spiders and clearly constitute interference competition, but such interactions do not contribute significantly to density-dependent regulation of this population.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
433FAF27E399FEAA142EA9491E81D3B9FB6B794A
Revue

Oecologia

Année de publication
1983
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
10
Sous-corpus
  • Arthropodes
Type de publication
Journal
ark:/67375/1BB-8KRT6XMH-L
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