Density dependence in marine fish populations revealed at small and large spatial scales

Ecology
Darren W Johnson

Abstract

Experimental manipulation of population density has frequently been used to demonstrate demographic density dependence. However, such studies are usually small scale and typically provide evidence of spatial (within-generation) density dependence. It is often unclear whether small-scale, experimental tests of spatial density dependence will accurately describe temporal (between-generation) density dependence required for population regulation. Understanding the mechanisms generating density dependence may provide a link between spatial experiments and temporal regulation of populations. In this study, I manipulated the density of recently settled kelp rockfish (Sebastes atrovirens) in both the presence and absence of predators to test for density-dependent mortality and whether predation was the mechanism responsible. I also examined mortality of rockfish cohorts within kelp beds throughout central California to evaluate temporal (between-generation) density dependence in mortality. Experiments suggested that short-term behavioral responses of predators and/or a shortage of prey refuges caused spatial density dependence. Temporal density dependence in mortality was also detected at larger spatial scales for several species of r...Continue Reading

References


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Citations

Jan 27, 2011·Ecological Applications : a Publication of the Ecological Society of America·J C FieldW J Sydeman
May 12, 2010·Ecology Letters·Heather A BerkleyDavid A Siegel
Jul 24, 2012·Ecology and Evolution·Julia KönigerJosef Greimler
Mar 11, 2020·Global Change Biology·Evan G MattiasenScott L Hamilton
Dec 3, 2016·Ecological Applications : a Publication of the Ecological Society of America·J Wilson WhiteLouis W Botsford

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