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https://hdl.handle.net/1959.11/31506
Title: | Predation risk is a function of alternative prey availability rather than predator abundance in a tropical savanna woodland ecosystem | Contributor(s): | Nordberg, Eric J (author) ; Schwarzkopf, Lin (author) | Publication Date: | 2019-05-22 | Open Access: | Yes | DOI: | 10.1038/s41598-019-44159-6 | Handle Link: | https://hdl.handle.net/1959.11/31506 | Abstract: | Typically, factors influencing predation risk are viewed only from the perspective of predators or prey populations but few studies have examined predation risk in the context of a food web. We tested two competing hypotheses regarding predation: (1) predation risk is dependent on predator density; and (2) predation risk is dependent on the availability of alternative prey sources. We use an empirical, multi-level, tropical food web (birds–lizards–invertebrates) and a mensurative experiment (seasonal fluctuations in abundance and artificial lizards to estimate predation risk) to test these hypotheses. Birds were responsible for the majority of attacks on artificial lizards and were more abundant in the wet season. Artificial lizards were attacked more frequently in the dry than the wet season despite a greater abundance of birds in the wet season. Lizard and invertebrate (alternative prey) abundances showed opposing trends; lizards were more abundant in the dry while invertebrates were more abundant in the wet season. Predatory birds attacked fewer lizards when invertebrate prey abundance was highest, and switched to lizard prey when invertebrate abundance reduced, and lizard abundance was greatest. Our study suggests predation risk is not predator density-dependent, but rather dependent on the abundance of invertebrate prey, supporting the alternative prey hypothesis. | Publication Type: | Journal Article | Source of Publication: | Scientific Reports, v.9, p. 1-11 | Publisher: | Nature Publishing Group | Place of Publication: | United Kingdom | ISSN: | 2045-2322 | Fields of Research (FoR) 2020: | 310301 Behavioural ecology 310914 Vertebrate biology 310308 Terrestrial ecology |
Socio-Economic Objective (SEO) 2020: | 180606 Terrestrial biodiversity | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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File | Description | Size | Format | |
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openpublished/PredationNordberg2019JournalArticle.pdf | Published version | 1.74 MB | Adobe PDF Download Adobe | View/Open |
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