Edge effects in patchy seagrass landscapes : the role of predation in determining fish distribution

Smith, Timothy M., Hindell, Jeremy S., Jenkins, Gregory P., Connolly, Rod M. and Keough, Michael J. 2011, Edge effects in patchy seagrass landscapes : the role of predation in determining fish distribution, Journal of experimental marine biology and ecology, vol. 399, no. 1, pp. 8-16, doi: 10.1016/j.jembe.2011.01.010.

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Title Edge effects in patchy seagrass landscapes : the role of predation in determining fish distribution
Author(s) Smith, Timothy M.ORCID iD for Smith, Timothy M. orcid.org/0000-0001-8612-8600
Hindell, Jeremy S.
Jenkins, Gregory P.
Connolly, Rod M.
Keough, Michael J.
Journal name Journal of experimental marine biology and ecology
Volume number 399
Issue number 1
Start page 8
End page 16
Total pages 9
Publisher Elsevier BV
Place of publication Amsterdam, The Netherlands
Publication date 2011-03-15
ISSN 0022-0981
Keyword(s) heterozostera nigricaulis
king george whiting
Port Phillip Bay
video sampling
Summary Predation is often described as an underlying mechanism to explain edge effects. We assessed the importance of predation in determining edge effects in seagrass using two approaches: a video survey to sample predators at small scales across seagrass edges, and a tethering experiment to determine if predation was an underlying mechanism causing edge effects. Underwater videos were placed at four positions: middle of seagrass patches; edge of seagrass; sand immediately adjacent to seagrass and sand distant from seagrass. Fish abundances and the time fish spent in view were measured. The main predatory fish (Australian salmon, Arripis spp.) spent more time over adjacent sand than other positions, while potential prey species (King George whiting, Sillaginodes punctata (Cuvier), recruits) were more common in the middle of seagrass patches. Other species, including the smooth toadfish, Tetractenos glaber (Freminville), and King George whiting adults, spent more time over sand adjacent to seagrass than distant sand, which may be related to feeding opportunities. King George whiting recruits and pipefish (Stigmatopora spp.) were tethered at each of the four positions. More whiting recruits were preyed upon at outer than inner seagrass patches, and survival time was greater in the middle of shallow seagrass patches than other positions. Relatively few pipefish were preyed upon, but of those that were, survival time was lower over sand adjacent to seagrass than at the seagrass edge or middle. Video footage revealed that salmon were the dominant predators of both tethered King George whiting recruits and pipefish. The distribution of predators and associated rate of predation can explain edge effects for some species (King George whiting) but other mechanisms, or combinations of mechanisms, are determining edge effects for other species (pipefish).
Language eng
DOI 10.1016/j.jembe.2011.01.010
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
050102 Ecosystem Function
050104 Landscape Ecology
Socio Economic Objective 960802 Coastal and Estuarine Flora, Fauna and Biodiversity
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30048013

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