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Related Concept Videos

Fixed Action Patterns01:06

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

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Published on: July 30, 2019

Seagrass patch size affects fish responses to edges.

Timothy M Smith1, Jeremy S Hindell, Greg P Jenkins

  • 1Department of Zoology, University of Melbourne, Parkville, Vic. 3010, Australia. t.smith11@prgad.unimelb.edu.au

The Journal of Animal Ecology
|August 7, 2009
PubMed
Summary
This summary is machine-generated.

Seagrass patch size influences edge effects on fish populations. Larger patches show increased edge density for pipefish, while smaller patches favor gobies at the edge.

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Area of Science:

  • Marine ecology
  • Habitat fragmentation
  • Landscape ecology

Background:

  • Ecological processes are influenced by habitat patch area and edge proximity.
  • Patch size affects core habitat availability, impacting animal abundance at edges versus interiors.
  • Edge effects may vary with patch size, a factor not well-studied in marine systems.

Purpose of the Study:

  • To investigate how seagrass patch size influences edge effects on fish abundance.
  • To determine if the magnitude and pattern of edge effects differ across various seagrass patch sizes.

Main Methods:

  • Fish were sampled in 10 seagrass patches of varying sizes (114–5934 m²).
  • Sampling used a 0.5 m² push net at three positions: patch edge, 2 m into the patch, and the patch middle.
  • Abundance of two common species, pipefish (Stigmatopora nigra) and gobies (Nesogobius maccullochi), was analyzed.

Main Results:

  • An interaction between patch size and edge-interior abundance differences was observed for both species.
  • Pipefish density increased at the edge with increasing patch size, while densities were similar in the smallest patches.
  • Gobies exhibited the opposite pattern, with higher edge densities in smaller patches.

Conclusions:

  • This study provides the first marine example of patch size influencing edge effect patterns and magnitude.
  • Conservation and management strategies for seagrass habitats must consider both patch area and edge effects.
  • Understanding these interactions is crucial for effective marine conservation planning.