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Developing methods for assessing abundance and distribution of European oysters (Ostrea edulis) using towed video

Journal article
Authors Linnea Mattsson-Thorngren
Thomas Dunér Holthuis
Susanne Lindegarth
Mats Lindegarth
Published in PLoS ONE
Volume 12
Issue 11
ISSN 1932-6203
Publication year 2017
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Department of Biological and Environmental Sciences
Language en
Links dx.doi.org/10.1371/journal.pone.018...
Keywords adult, DNA polymorphism, error, habitat, human, monitoring, nonhuman, Ostrea edulis, validation process, videorecording
Subject categories Earth and Related Environmental Sciences

Abstract

Due to large-scale habitat losses and increasing pressures, benthic habitats in general, and perhaps oyster beds in particular, are commonly in decline and severely threatened on regional and global scales. Appropriate and cost-efficient methods for mapping and monitoring of the distribution, abundance and quality of remaining oyster populations are fundamental for sustainable management and conservation of these habitats and their associated values. Towed video has emerged as a promising method for surveying benthic communities in a both non-destructive and cost-efficient way. Here we examine its use as a tool for quantification and monitoring of oyster populations by (i) analysing how well abundances can be estimated and how living Ostrea edulis individuals can be distinguished from dead ones, (ii) estimating the variability within and among observers as well as the spatial variability at a number of scales, and finally (iii) evaluating the precision of estimated abundances under different scenarios for monitoring. Overall, the results show that the can be used to quantify abundance and occurrence of Ostrea edulis in heterogeneous environments. There was a strong correlation between abundances determined in the field and abundances estimated by video-analyses (r2 = 0.93), even though video analyses underestimated the total abundance of living oysters by 20%. Additionally, the method was largely repeatable within and among observers and revealed no evident bias in identification of living and dead oysters. We also concluded that the spatial variability was an order of magnitude larger than that due to observer errors. Subsequent modelling of precision showed that the total area sampled was the main determinant of precision and provided general method for determining precision. This study provides a thorough validation of the application of towed video on quantitative estimations of live oysters. The results suggest that the method can indeed be very useful for this purpose and we therefor recommend it for future monitoring of oysters and other threatened habitats and species. © 2017 Thorngren et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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