Local densities and habitat preference of the critically endangered spotted handfish (Brachionichthys hirsutus): Large scale field trial of GPS parameterised underwater visual census and diver attached camera

The critically endangered spotted handfish (Brachionichthys hirsutus) is restricted to a limited number of locations in south-eastern Tasmania, Australia. As is often the case for rare species, conducting statistically adequate surveys for B. hirsutus can be costly and time consuming due to the low...

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Bibliographic Details
Published in:PloS one 2018-08, Vol.13 (8), p.e0201518-e0201518
Main Authors: Wong, Lincoln S C, Lynch, Tim P, Barrett, Neville S, Wright, Jeffrey T, Green, Mark A, Flynn, David J H
Format: Article
Language:English
Subjects:
Algae
Autonomous underwater vehicles
Bagroides hirsutus
Biology and Life Sciences
Brachionichthys hirsutus
Cameras
Census
Censuses
Earth Sciences
Ecology and Environmental Sciences
Endangered & extinct species
Endangered species
Engineering and Technology
Estuaries
Fisheries
Fishes
Foraging habitats
Global positioning systems
GPS
Habitats
Local population
Methods
Microenvironments
Microhabitats
Parameterization
Polls & surveys
Population
Populations
Predators
Rare species
Satellite navigation systems
Spawning
Substrates
Surveys
Underwater
Wildlife conservation
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Summary:The critically endangered spotted handfish (Brachionichthys hirsutus) is restricted to a limited number of locations in south-eastern Tasmania, Australia. As is often the case for rare species, conducting statistically adequate surveys for B. hirsutus can be costly and time consuming due to the low probability of encountering individuals. For the first time we used a highly efficient and rigorous Global Positioning System (GPS) parameterised underwater visual census (GUVC) to survey B. hirsutus abundance within all nine known local populations in the Derwent Estuary within one season. In addition, a benthic microhabitat assessment was conducted simultaneously using a GoPro® camera attached to diver to determine B. hirsutus microhabitat preferences. B. hirsutus local populations varied between sites, with densities ranging from 1.58 to 43.0 fishes per hectare. B. hirsutus demonstrates a strong preference for complex microhabitat features, such as depressions and ripple formations filled with biogenic substrates (e.g. shells) but avoids simple, low relief microhabitats (e.g. sand flats) and areas dominated by ephemeral, filamentous algae. Complex microhabitats may enable B. hirsutus to avoid predators, increase forage opportunities or provide higher quality spawning sites. This first wide-scale application of GUVC for B. hirsutus allowed us to survey a larger number of sites than previously possible to provide a robust reference point for future long-term monitoring.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0201518