OPTIMAL BODY SIZE, DENSITY-DEPENDENT SELECTION GRADIENTS, AND PHENOTYPIC VARIANCE UNDER ASYMMETRIC COMPETITION

Ecology ◽  
2004 ◽  
Vol 85 (5) ◽  
pp. 1460-1467 ◽  
Author(s):  
Éva Kisdi
Keyword(s):  
Body Size ◽  
Phenotypic Variance ◽  
Asymmetric Competition ◽  
Density Dependent ◽  
Selection Gradients ◽  
Density Dependent Selection

scholarly journals Density-dependent natural selection mediates harvest-induced trait changes

2019 ◽  
Author(s):  
Alix Bouffet-Halle ◽  
Jacques Mériguet ◽  
David Carmignac ◽  
Simon Agostini ◽  
Alexis Millot ◽  
...  
Keyword(s):  
Life History ◽  
Body Size ◽  
Natural Selection ◽  
Large Body ◽  
Population Densities ◽  
Large Body Size ◽  
Density Dependent ◽  
Show Evidence ◽  
Selection For ◽  
Density Dependent Selection

ABSTRACTRapid life-history changes caused by size-selective harvesting are often interpreted as a response to direct harvest selection against a large body size. However, similar trait changes may result from a harvest-induced relaxation of natural selection for a large body size via density-dependent selection. Here, we show evidence of such density-dependent selection favouring large-bodied individuals at high population densities, in replicated pond populations of medaka fish. Harvesting, in contrast, selected medaka directly against large-bodied medaka and, in parallel, decreased medaka population densities. Five years of harvesting were enough for harvested and unharvested medaka populations to inherit the classically-predicted trait differences, whereby harvested medaka grew slower and matured earlier than unharvested medaka. We demonstrate that this life-history divergence was not driven by direct harvest selection for a smaller body size in harvested populations, but by density-dependent natural selection for a larger body size in unharvested populations.

Density-Dependent Selection on Polymorphic Prey -- Some Data

1977 ◽  
Vol 111 (979) ◽  
pp. 594-598 ◽  
Author(s):  
Laurence M. Cook ◽  
Patricia Miller
Keyword(s):  
Density Dependent ◽  
Density Dependent Selection

Rapid growth and large body size in annual fish populations are compromised by density‐dependent regulation

2019 ◽  
Vol 95 (2) ◽  
pp. 673-678 ◽  
Author(s):  
Milan Vrtílek ◽  
Jakub Žák ◽  
Matej Polačik ◽  
Radim Blažek ◽  
Martin Reichard
Keyword(s):  
Body Size ◽  
Rapid Growth ◽  
Large Body ◽  
Fish Populations ◽  
Large Body Size ◽  
Annual Fish ◽  
Density Dependent ◽  
Density Dependent Regulation
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