Results 131 to 140 of about 873 (157)
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A novel underwater visual census: Seahorse population survey as a case study
Regional Studies in Marine Science, 2016Abstract Two different Underwater Visual Census (UVC1 and UVC2) were performed at three sites in the Ria Formosa, using 30 meter transect belts, and compared for differences in seahorse density and holdfast availability. Each UVC differed in transect placement and total survey area coverage.
JOSÉ Andrade +2 more
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Comparison of visual census and underwater video for fish sampling in Neotropical reservoirs
Environmental Biology of Fishes, 2020Different techniques have been employed for fish surveys in freshwater impoundments, however, despite the increasing applicability of underwater video systems for fish sampling in different aquatic ecosystems, such technology has not been tested in reservoirs.
Fabrício de Andrade Frehse +2 more
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Coral Reefs, 2013 Movement patterns of some coral reef fishes change with natural cycles (e.g., tidal, lunar and seasonal), resulting in short-term shifts in fish assemblages. We reviewed the literature on temporal changes in coral reef fish assemblages derived from underwater visual census (UVC) and found that movement was rarely considered in experimental design and ...
Paul Cowley
exaly +4 more sources
Combining underwater visual census and self-organising maps: a freshwater ecology application
Underwater Technology, 2011 R Palozzi +4 more
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Improvement of fish length estimates for underwater visual census of reef fish biomass
Journal of Applied Ichthyology, 2015Summary Accuracy and precision are of great importance in the assessment of reef fish biomass when conducting an underwater visual census (UVC). Quantification and subsequent correction of the bias is required in order to standardize the estimates and correct for underwater distortion.
I. Yulianto +5 more
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Compensating for length biases in underwater visual census of fishes using stereo video measurements
Marine and Freshwater Research, 2014Underwater visual census (UVC) is a widely used technique for estimating species richness, abundance, and lengths of reef fishes. The technique has the advantage of being non-destructive, and can therefore be used for monitoring in marine protected areas.
Davis, Tom +2 more
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Environmental Biology of Fishes, 2006
We developed and tested a new visual census technique to quantify the importance of vertical habitat structure on the associated fish assemblages in the littoral zone of a freshwater lake. We demonstrated that the primary environmental gradient, accounting for the most variation in the species data, represented a temporal gradient of seasonal ...
Julianne S. Mayo, Donald A. Jackson
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We developed and tested a new visual census technique to quantify the importance of vertical habitat structure on the associated fish assemblages in the littoral zone of a freshwater lake. We demonstrated that the primary environmental gradient, accounting for the most variation in the species data, represented a temporal gradient of seasonal ...
Julianne S. Mayo, Donald A. Jackson
openaire +1 more source
Science of the Total EnvironmentFish monitoring is essential for assessing the effects of natural and anthropic stressors on marine ecosystems. In this context, environmental DNA (eDNA) metabarcoding appears to be a promising tool, due to its efficiency in species detection. However, before this method can be fully implemented in monitoring programs, more studies are needed to ...
Virginie Raybaud +2 more
exaly +3 more sources
Ecological Modelling, 2017
Abstract Underwater visual census (UVC) methods are used worldwide to monitor shallow marine and freshwater habitats and support management and conservation decisions. However, several sources of bias still undermine the ability of these methods to accurately estimate abundances of some species.
Henrique Cabral, MIGUEL Pessanha Pais
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Abstract Underwater visual census (UVC) methods are used worldwide to monitor shallow marine and freshwater habitats and support management and conservation decisions. However, several sources of bias still undermine the ability of these methods to accurately estimate abundances of some species.
Henrique Cabral, MIGUEL Pessanha Pais
exaly +3 more sources
Biological Conservation, 2015
Monitoring is essential for effective conservation and management but the ability of monitoring to deliver accurate and precise measures of changes in abundance is often not evaluated, particularly in marine studies. Here we use long-term datasets from three New Zealand marine reserves to evaluate the capacity of underwater visual census monitoring to ...
Timothy Jones +3 more
openaire +1 more source
Monitoring is essential for effective conservation and management but the ability of monitoring to deliver accurate and precise measures of changes in abundance is often not evaluated, particularly in marine studies. Here we use long-term datasets from three New Zealand marine reserves to evaluate the capacity of underwater visual census monitoring to ...
Timothy Jones +3 more
openaire +1 more source