Fish responses to experimental fragmentation of seagrass habitat

Macreadie, Peter I., Hindell, Jeremy S., Jenkins, Gregory P., Connolly, Rod M. and Keough, Michael J. 2009, Fish responses to experimental fragmentation of seagrass habitat, Conservation biology, vol. 23, no. 3, pp. 644-652, doi: 10.1111/j.1523-1739.2008.01130.x.

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Title Fish responses to experimental fragmentation of seagrass habitat
Author(s) Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Hindell, Jeremy S.
Jenkins, Gregory P.
Connolly, Rod M.
Keough, Michael J.
Journal name Conservation biology
Volume number 23
Issue number 3
Start page 644
End page 652
Total pages 9
Publisher Wiley
Place of publication London, Eng.
Publication date 2009-06
ISSN 1523-1739
Keyword(s) Alismatidae
Analysis of Variance
Marine Biology
Population Dynamics
Species Specificity
Time Factors
Summary Understanding the consequences of habitat fragmentation has come mostly from comparisons of patchy and continuous habitats. Because fragmentation is a process, it is most accurately studied by actively fragmenting large patches into multiple smaller patches. We fragmented artificial seagrass habitats and evaluated the impacts of fragmentation on fish abundance and species richness over time (1 day, 1 week, 1 month). Fish assemblages were compared among 4 treatments: control (single, continuous 9-m(2) patches); fragmented (single, continuous 9-m(2) patches fragmented to 4 discrete 1-m(2) patches); prefragmented/patchy (4 discrete 1-m(2) patches with the same arrangement as fragmented); and disturbance control (fragmented then immediately restored to continuous 9-m(2) patches). Patchy seagrass had lower species richness than actively fragmented seagrass (up to 39% fewer species after 1 week), but species richness in fragmented treatments was similar to controls. Total fish abundance did not vary among treatments and therefore was unaffected by fragmentation, patchiness, or disturbance caused during fragmentation. Patterns in species richness and abundance were consistent 1 day, 1 week, and 1 month after fragmentation. The expected decrease in fish abundance from reduced total seagrass area in fragmented and patchy seagrass appeared to be offset by greater fish density per unit area of seagrass. If fish prefer to live at edges, then the effects of seagrass habitat loss on fish abundance may have been offset by the increase (25%) in seagrass perimeter in fragmented and patchy treatments. Possibly there is some threshold of seagrass patch connectivity below which fish abundances cannot be maintained. The immediate responses of fish to experimental habitat fragmentation provided insights beyond those possible from comparisons of continuous and historically patchy habitat.
Language eng
DOI 10.1111/j.1523-1739.2008.01130.x
Field of Research 050102 Ecosystem Function
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
060701 Phycology (incl Marine Grasses)
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2009, Wiley
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