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- W2016511210 abstract "a b s t r a c t We assessed a time-based technique for estimating the relative abundance and size composition of popu- lations of the beach clam, Donax deltoides, in the swash zone of exposed ocean beaches by comparing it with a standard quadrat-based method. The time-based method consisted digging small plots of sand by hand and scooping sediment and clams into a mesh bag attached to a rigid frame. We tested three digging times (30, 60 and 120 s) and two mesh sizes (12 and 19 mm). Compared to a standard box-quadrat, the time-based diggings were more effective and efficient in terms of numbers of clams collected per time taken to do a sample. The timed digging technique was also much simpler and less problematic to use in the swash zone, which is important when industry are involved in sampling. Although a greater total number of clams were collected in the 120 s diggings, when the CPUE data were standardized to number per 30 s, a greater proportion of clams were collected in the shortest time frame tested. This suggests most clams were captured in the first 30 s of digging, with fewer caught per unit of time thereafter. A major benefit of using the shortest digging time is that a greater number of replicate samples and patches of clams on a beach can be sampled per given unit of time, potentially improving overall precision without large increases in costs. An optimal sampling design would involve sampling more patches on a beach than replicates within a patch. Given a sampling window of 3 h either side of low tide, we suggest that future sampling should incorporate 6 replicate 30-s diggings at each of 8 patches on a beach. We further recommend that a 12 mm mesh bag be used as it retained a greater proportion of small clams (<20 mm). This study highlights the importance of doing pilot studies to develop appropriate sampling gears and for determining optimal, cost-effective sampling strategies for large-scale surveys." @default.
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- W2016511210 date "2014-06-01" @default.
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- W2016511210 title "Development of rapid sampling procedures for an exploited bivalve in the swash zone on exposed ocean beaches" @default.
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- W2016511210 doi "https://doi.org/10.1016/j.fishres.2014.02.027" @default.
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