Is competition needed for ecological character displacement? Does displacement decrease competition?
نویسندگان
چکیده
منابع مشابه
Is 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...
متن کاملEcological Character Displacement in a Variable Environment
We analyzed a simple genetic model of ecological character displacement in a fluctuating environment. Character states of two identical, competing species were determined by a single-gene, two-allele model. In each generation, the carrying capacity of different segments of a uniform resource spectrum fluctuated randomly. Interand intraspecific exploitation competition reduced litnesses of simil...
متن کاملEcological character displacement and speciation in sticklebacks.
We present evidence of ecological character displacement among species of threespined sticklebacks that inhabit small lakes of coastal British Columbia. Geological data suggest that the populations resulted from multiple divergence and speciation events over the past 13,000 yr. In lakes with two species, one is invariably "limnetic" in morphology and habitat, and the other is "benthic." Other l...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Evolution
سال: 2015
ISSN: 0014-3820,1558-5646
DOI: 10.1111/evo.12816