title: The effect of habitat structure on prey mortality depends on predator and prey microhabitat use.
abstract: Structurally complex habitats provide cover and may hinder the movement of animals. In predator-prey relationships, habitat structure can decrease predation risk when it provides refuges for prey or hinders foraging activity of predators. However, it may also provide shelter, supporting structures and perches for sit-and-wait predators and hence increase their predation rates. We tested the effect of habitat structure on prey mortality in aquatic invertebrates in short-term laboratory predation trials that differed in the presence or absence of artificial vegetation. The effect of habitat structure on prey mortality was context dependent as it changed with predator and prey microhabitat use. Specifically, we observed an 'anti-refuge' effect of added vegetation: phytophilous predators that perched on the plants imposed higher predation pressure on planktonic prey, while mortality of benthic prey decreased. Predation by benthic and planktonic predators on either type of prey remained unaffected by the presence of vegetation. Our results show that the effects of habitat structure on predator-prey interactions are more complex than simply providing prey refuges or cover for predators. Such context-specific effects of habitat complexity may alter the coupling of different parts of the ecosystem, such as pelagic and benthic habitats, and ultimately affect food web stability through cascading effects on individual life histories and trophic link strengths.
authors.affiliation: Department of Ecosystems Biology, Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice, 37005, Czech Republic, jan.klecka@eawag.ch.
authors.forename: Jan
authors.initials: J
authors.lastname: Klecka
authors.forename: David S
authors.initials: DS
authors.lastname: Boukal
mesh_terms: D000818:Animals; D018153:Czech Republic; D017753:Ecosystem; D020387:Food Chain; D007313:Insecta / Q000502:physiology*; D016014:Linear Models; D009026:Mortality; D011235:Predatory Behavior / Q000502:physiology; D012621:Seasons; D015048:Zooplankton / Q000502:physiology*
references.citation: Oecologia. 2006 Nov;150(1):141-54
references.pmid: 16932971
references.citation: J Anim Ecol. 2010 May;79(3):556-62
references.pmid: 20163490
references.citation: Oecologia. 2004 Mar;139(1):1-10
references.pmid: 14872336
references.citation: Oecologia. 2010 Jul;163(3):625-36
references.pmid: 20213153
references.citation: Oecologia. 1994 Aug;98(3-4):344-353
references.pmid: 28313911
references.citation: Oecologia. 1989 Aug;80(2):158-166
references.pmid: 28313101
references.citation: Oecologia. 2004 Sep;141(1):105-13
references.pmid: 15197644
references.citation: J Anim Ecol. 2013 Sep;82(5):1031-41
references.pmid: 23869526
references.citation: PLoS One. 2012;7(6):e37741
references.pmid: 22679487
references.citation: Am Nat. 1997 Dec;150(6):798-812
references.pmid: 18811337
references.citation: Ecology. 2008 Dec;89(12):3413-22
references.pmid: 19137947
references.citation: Oecologia. 1990 Jun;83(3):371-377
references.pmid: 28313009
references.citation: Trends Ecol Evol. 1991 Jan;6(1):8-13
references.pmid: 21232412
references.citation: Oecologia. 2004 Sep;141(1):171-8
references.pmid: 15300485
references.citation: Ecol Lett. 2005 May;8(5):513-23
references.pmid: 21352455
references.citation: Braz J Biol. 2008 Feb;68(1):211-9
references.pmid: 18470400
references.citation: PeerJ. 2014 May 22;2:e389
references.pmid: 24883250