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Functional connectivity from a reef fish perspective: behavioral tactics for moving in a fragmented landscape
Katrine Turgeon1, Audrey Robillard, Jacinthe Grégoire
1Department of Biology, McGill University, 1205 Docteur Penfield Avenue, Montréal, Québec H3A 1B1, Canada. katrine.turgeon@mail.mcgill.ca
Ecology
|December 15, 2010
Summary
Marine protected areas rely on functional connectivity. Sand acted as a barrier to damselfish movement, with avoidance increasing with sand gap width and influencing habitat use.
Area of Science:
- Marine ecology
- Behavioral ecology
- Conservation science
Background:
- Functional connectivity is crucial for marine protected area effectiveness, yet poorly understood in marine organisms.
- Animal movement decisions integrate habitat costs and benefits, influencing landscape permeability.
Purpose of the Study:
- To investigate how open sand and conspecific distribution affect functional connectivity in longfin damselfish (Stegastes diencaeus).
- To quantify the impact of sand gap width and landscape configuration on damselfish movement.
Main Methods:
- 102 longfin damselfish were translocated to experimental sites with varying sand gap widths and configurations (Continuous, Detour, Patch).
- Homing paths were visually tracked and mapped to analyze movement decisions and barrier effects.
Main Results:
- Sand acted as a partial barrier in Detour and Patch configurations, but not in Continuous configurations.
- The probability of crossing sand gaps decreased significantly with increasing width (>1.85m in Detour, >3.90m in Patch).
- Damselfish exhibited avoidance of wider sand gaps and conspecific territories, suggesting navigation influenced by both landscape and social factors.
Conclusions:
- This study provides the first quantification of a marine movement barrier's size and steepness.
- Both landscape configuration and the presence of conspecifics significantly influence functional connectivity in damselfish.
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