Defining Critical Habitats of Threatened and Endemic Reef Fishes with a Multivariate Approach |
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Authors: | STEVEN W PURCELL K ROBERT CLARKE KELVIN RUSHWORTH STEVEN J DALTON |
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Institution: | 1. National Marine Science Centre, Southern Cross University, , Coffs Harbour, NSW, 2450 Australia;2. Plymouth Marine Laboratory, , West Hoe, Plymouth, PL1 3DH United Kingdom;3. Western Australian Fisheries and Marine Research Laboratories, Department of Fisheries Western Australia, , North Beach, WA, 6920 Australia |
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Abstract: | Understanding critical habitats of threatened and endemic animals is essential for mitigating extinction risks, developing recovery plans, and siting reserves, but assessment methods are generally lacking. We evaluated critical habitats of 8 threatened or endemic fish species on coral and rocky reefs of subtropical eastern Australia, by measuring physical and substratum‐type variables of habitats at fish sightings. We used nonmetric and metric multidimensional scaling (nMDS, mMDS), Analysis of similarities (ANOSIM), similarity percentages analysis (SIMPER), permutational analysis of multivariate dispersions (PERMDISP), and other multivariate tools to distinguish critical habitats. Niche breadth was widest for 2 endemic wrasses, and reef inclination was important for several species, often found in relatively deep microhabitats. Critical habitats of mainland reef species included small caves or habitat‐forming hosts such as gorgonian corals and black coral trees. Hard corals appeared important for reef fishes at Lord Howe Island, and red algae for mainland reef fishes. A wide range of habitat variables are required to assess critical habitats owing to varied affinities of species to different habitat features. We advocate assessments of critical habitats matched to the spatial scale used by the animals and a combination of multivariate methods. Our multivariate approach furnishes a general template for assessing the critical habitats of species, understanding how these vary among species, and determining differences in the degree of habitat specificity. Definición de Hábitats Críticos para Peces Arrecifales Amenazados y Endémicos Mediante un Método Multivariado |
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Keywords: | algae conservation planning coral reef extinction risk marine sponges threatened species Algas arrecife de coral especies amenazadas esponjas marina planificació n de la conservació n riesgo de extinció n |
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