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Influence of habitat complexity
on reef fish abundance
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McCoy and Bell (1991): habitat structure isdefined through
its:
1. complexity = absolute abundance of the
habitat structure2. heterogeneity = number of varying
habitatstructural components
3. scale used to measure 1 & 2Bartholomew, A., Diaz, R. and
Cicchetti, G..2000.New dimensionless indices of structural
habitat
complexity: predicted and actual effects on predator's foraging
success. Marine Ecology Progress Series 206,45-48
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Kramer, D., Rangeley, R. and Chapman, L..Habitat selection:
patterns of spatial distribution from behavioural
decisions.pp 37-80
- differential reproductionand mortality
- colonisation andextinction-involuntary transport andvoluntary
movements
Fishdensity
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Habitat Selection
Optimal habitat selection
Kramer, D., Rangeley, R. and Chapman, L..Habitat selection:
patterns of spatial distribution from behaviouraldecisions.pp
37-80
Predation riskForaging profitability
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Gratwicke and Speight,2005; Friedlander and Parrish, 1998
Habitat complexity
Rugosity
Coral coverCoral heightHole numbers and sizes
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What can habitat complexity do?
(Bell and Galzin, 1984;Friedlander and Parish,1998; Dominici and
Wolff, 2005;Johnson, 2007; Bartholomew, Diaz and Cichetti,2000)
Habitatcomplexity
Relaxescompetition
Role in regulation offoraging patterns
Provides physicalstructurefor juvenile and adultanimals
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HabitatComplexity
Predation
Competition
abundance
abundance
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Friedlander, A. and Parrish, J..1998.Habitat characteristics
affecting fish assemblages on a Hawaiian coralreef.Journal of
Experimental Marine Biology and Ecology 224, 1-30
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Bartholomew, A., Diaz, R. and Cicchetti, G..2000.New
dimensionless indices of structural habitat complexity:
predicted and actual effects on predator's foraging success.
Marine Ecology Progress Series 206, 45-48
Ct/At = measures the
amount of coverwithin a habitat thatprey species canhide
behind
Sp/Pr = measuresthe extent to which
predatormanueverability isreduced within ahabitat
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http://www.oneocean.org/about_crmp/coastal.html
Mangrove-seagrass-coral triangle
Dorenbosch, 2008
=http://blogs.panda.org/coral_triangle/files/2009/08/D3X6363.jpg
http://www.treehugger.com/files/2009/05/coral-reef-loss-southeast-asia-reduce-food-supplies-80-percent.php
Mangroves
Recruitment and settlement
Migration of juveniles and/orsubadults
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- scale has profound effects on resultant patterns, withfine
scale measure often giving better prediction of onegroup of
organisms and landscape measurespredictions of others
-some fishes respond to habitat features at fine spatialscales
while others respond to features at landscape
scales
(Grobert and Dunsmore, 2008)
