Size-Based Hydroacoustic Measures of Within-Season Fish Abundance in a Boreal Freshwater Ecosystem
Identifieur interne : 000015 ( Main/Exploration ); précédent : 000014; suivant : 000016Size-Based Hydroacoustic Measures of Within-Season Fish Abundance in a Boreal Freshwater Ecosystem
Auteurs : Riley A. Pollom ; George A. RoseSource :
- PLoS ONE [ 1932-6203 ] ; 2015.
Abstract
Eleven sequential size-based hydroacoustic surveys conducted with a 200 kHz split-beam transducer during the summers of 2011 and 2012 were used to quantify seasonal declines in fish abundance in a boreal reservoir in Manitoba, Canada. Fish densities were sufficiently low to enable single target resolution and tracking. Target strengths converted to log2-based size-classes indicated that smaller fish were consistently more abundant than larger fish by a factor of approximately 3 for each halving of length. For all size classes, in both years, abundance (natural log) declined linearly over the summer at rates that varied from -0.067.day-1 for the smallest fish to -0.016.day-1 for the largest (R2 = 0.24–0.97). Inter-annual comparisons of size-based abundance suggested that for larger fish (>16 cm), mean winter decline rates were an order of magnitude lower (-0.001.day-1) and overall survival higher (71%) than in the main summer fishing season (mean loss rate -0.038.day-1; survival 33%). We conclude that size-based acoustic survey methods have the potential to assess within-season fish abundance dynamics, and may prove useful in long-term monitoring of productivity and hence management of boreal aquatic ecosystems.
Url:
DOI: 10.1371/journal.pone.0124799
PubMed: 25875467
PubMed Central: 4398392
Affiliations:
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Rose</name><affiliation><nlm:aff id="aff001"></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25875467</idno><idno type="pmc">4398392</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4398392</idno><idno type="RBID">PMC:4398392</idno><idno type="doi">10.1371/journal.pone.0124799</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000007</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000007</idno><idno type="wicri:Area/Pmc/Curation">000007</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">000007</idno><idno type="wicri:Area/Pmc/Checkpoint">000011</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">000011</idno><idno type="wicri:Area/Ncbi/Merge">000381</idno><idno type="wicri:Area/Ncbi/Curation">000381</idno><idno type="wicri:Area/Ncbi/Checkpoint">000381</idno><idno type="wicri:Area/Main/Merge">000015</idno><idno type="wicri:Area/Main/Curation">000015</idno><idno type="wicri:Area/Main/Exploration">000015</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Size-Based Hydroacoustic Measures of Within-Season Fish Abundance in a Boreal Freshwater Ecosystem</title><author><name sortKey="Pollom, Riley A" sort="Pollom, Riley A" uniqKey="Pollom R" first="Riley A." last="Pollom">Riley A. Pollom</name><affiliation><nlm:aff id="aff001"></nlm:aff></affiliation></author><author><name sortKey="Rose, George A" sort="Rose, George A" uniqKey="Rose G" first="George A." last="Rose">George A. Rose</name><affiliation><nlm:aff id="aff001"></nlm:aff></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Eleven sequential size-based hydroacoustic surveys conducted with a 200 kHz split-beam transducer during the summers of 2011 and 2012 were used to quantify seasonal declines in fish abundance in a boreal reservoir in Manitoba, Canada. Fish densities were sufficiently low to enable single target resolution and tracking. Target strengths converted to log<sub>2</sub>-based size-classes indicated that smaller fish were consistently more abundant than larger fish by a factor of approximately 3 for each halving of length. For all size classes, in both years, abundance (natural log) declined linearly over the summer at rates that varied from -0.067.day<sup>-1</sup> for the smallest fish to -0.016.day<sup>-1</sup> for the largest (R<sup>2</sup> = 0.24–0.97). Inter-annual comparisons of size-based abundance suggested that for larger fish (>16 cm), mean winter decline rates were an order of magnitude lower (-0.001.day<sup>-1</sup>) and overall survival higher (71%) than in the main summer fishing season (mean loss rate -0.038.day<sup>-1</sup>; survival 33%). 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