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Filters: Tags: Fisheries Research (X) > partyWithName: Daniel L. Yule (X) > partyWithName: Thomas R. Hrabik (X)

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Acoustic methods are used to estimate the density of pelagic fish in large lakes with results of midwater trawling used to assign species composition. Apportionment in lakes having mixed species can be challenging because only a small fraction of the water sampled acoustically is sampled with trawl gear. Here we describe a new method where single echo detections (SEDs) are assigned to species based on classification tree models developed from catch data that separate species based on fish size and the spatial habitats they occupy. During the summer of 2011, we conducted a spatially-balanced lake-wide acoustic and midwater trawl survey of Lake Superior. A total of 51 sites in four bathymetric depth strata (0–30 m,...
Categories: Publication; Types: Citation; Tags: Fisheries Research
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We examined the spatial scale of recruitment variability for disparate cisco (Coregonus artedi) populations in the Great Lakes (n = 8) and Minnesota inland lakes (n = 4). We found that the scale of synchrony was approximately 400 km when all available data were utilized; much greater than the 50-km scale suggested for freshwater fish populations in an earlier global analysis. The presence of recruitment synchrony between Great Lakes and inland lake cisco populations supports the hypothesis that synchronicity is driven by climate and not dispersal. We also found synchrony in larval densities among three Lake Superior populations separated by 25–275 km, which further supports the hypothesis that broad-scale climatic...
Categories: Publication; Types: Citation; Tags: Fisheries Research


    map background search result map search result map Use of classification trees to apportion single echo detections to species: Application to the pelagic fish community of Lake Superior Use of classification trees to apportion single echo detections to species: Application to the pelagic fish community of Lake Superior