caa a22 4500 469097523 CHVBK 20180323133035.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF00317234 doi (NATIONALLICENCE)springer-10.1007/BF00317234 Evidence of exploitative competition among young stages of the wolf spider Schizocosa ocreata [Elektronische Daten] [David Wise, James Wagner] Summary: Previous research by many investigators has demonstrated food limitation in both web-building and wandering spiders. Field experiments have tested for exploitative competition for prey in web-building, but not wandering species. As a first step to examining the question of whether spiders without webs exhibit exploitative competition, we manipulated densities of young stages of a common wolf spider, Schizocos ocreata, and measured (1) spider growth rate and (2) numbers of Collembola, a potential prey organism. Replicate populations of recently hatched S. ocreata were established in 1-m2 fenced plots at four levels: 0×, 0.25×, 1× and 4× natural density. Increasing spider density had a negative effect on spider growth rate, defined as increase in weight or cephalothorax width. Early in the experiment spider density had a weak negative effect on Collembola numbers [p(F)=0.08]. Taken together, this probable response by Collembola and the clear effect of spider density on growth rate constitute the first experimental evidence of intraspecific exploitative competition for prey in a species of wandering spider. We discuss (1) the strength of this evidence given the constraints of the experiment's design, and (2) the implications of the strong convergence in spider densities that had occurred after 2.5 months. Springer-Verlag, 1992 Exploitative competition nationallicence Density convergence nationallicence Field experiment nationallicence Wolf spider nationallicence Schizocosa ocreata nationallicence Wise David Department of Biological Sciences, University of Maryland, Baltimore County Campus, 21228-5398, Baltimore, MD, USA aut Wagner James Department of Biological Sciences, University of Maryland, Baltimore County Campus, 21228-5398, Baltimore, MD, USA aut Oecologia Springer-Verlag 91/1(1992-08-01), 7-13 0029-8549 91:1<7 1992 91 442 https://doi.org/10.1007/BF00317234 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317234 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wise David Department of Biological Sciences, University of Maryland, Baltimore County Campus, 21228-5398, Baltimore, MD, USA aut NATIONALLICENCE 700 1- Wagner James Department of Biological Sciences, University of Maryland, Baltimore County Campus, 21228-5398, Baltimore, MD, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 91/1(1992-08-01), 7-13 0029-8549 91:1<7 1992 91 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer