Character Displacement in Sphaeroma spp. (Isopoda: Crustacea). II. Competition for Space
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چکیده
منابع مشابه
Character Displacement in Sphaeroma spp. (Isopoda: Crustacea). 11. Competition for Space
The two sibling lsopod species Sphaeroma hookeri and S. rugicauda show divergent character displacement with respect to body size of syrnpatric populations (Frier, 1979a). The present paper investigates the hypothesis that this displacement causes a relaxation of interspecific competition for space. It provides field evidence of substrate preferences of the various lifecycle stages of isopods a...
متن کاملFirst record of the exotic isopod Sphaeroma serratum (Crustacea: Isopoda) from Uruguayan waters (southwestern Atlantic)
BRENDA DOTI, EVANGELINA SCHWINDT & FABRIZIO SCARABINO Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina Grupo de Ecología en Ambientes Costeros, Centro Nacional Patagónico (CENPAT-CONICET), Blvd. Brown 2915, Puerto Madryn (U9120ACD), Argentina. E-mail: schwindt@cen...
متن کاملIs competition needed for ecological character displacement? Does displacement decrease competition?
Interspecific competition for resources is generally considered to be the selective force driving ecological character displacement, and displacement is assumed to reduce competition. Skeptics of the prevalence of character displacement often cite lack of evidence of competition. The present article uses a simple model to examine whether competition is needed for character displacement and whet...
متن کاملCompetition, Habitat Selection, and Character Displacement in a Patchy Environment.
Suppose now we are at optimum geometric design. Then, if our vector could suffer arbitrary variations, we could lower all the undesirable quantities by simply decreasing the first two components, keeping the second two components fixed. Such a possibility is in contradiction to our assumption of being at a minimum. We conclude that in the vicinity of the optimum design the vector (LFe, Lcu, AFe...
متن کاملDeclining interspecific competition during character displacement: Summoning the ghost of competition past
Prevailing theories of biotic diversification incorporate resource competition as a leading cause of divergence between new species. In support of this, many cases of divergent character displacement between close relatives (congeners) are known. Yet, experimental tests of underlying mechanisms are uncommon. In a pond experiment with threespine sticklebacks (Gasterosteus spp.), we tested the pr...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 1979
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps001165