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Titolo:
Effects of in situ target spatial distributions on acoustic density estimates
Autore:
Jech, JM; Horne, JK;
Indirizzi:
Univ Michigan, Cooperat Inst Limnol & Ecosyst Res, Ann Arbor, MI 48105 USAUniv Michigan Ann Arbor MI USA 48105 Ecosyst Res, Ann Arbor, MI 48105 USA NOAA, Great Lakes Environm Res Lab, Ann Arbor, MI 48105 USA NOAA Ann Arbor MI USA 48105 kes Environm Res Lab, Ann Arbor, MI 48105 USA
Titolo Testata:
ICES JOURNAL OF MARINE SCIENCE
fascicolo: 1, volume: 58, anno: 2001,
pagine: 123 - 136
SICI:
1054-3139(200102)58:1<123:EOISTS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
VERTICAL MIGRATION BEHAVIOR; BEAM ECHO-SOUNDER; FISH GROWTH-RATE; 3-SPINED STICKLEBACKS; PELAGIC PLANKTIVORES; FISHERIES ACOUSTICS; BRITISH-COLUMBIA; EXPLICIT MODELS; ABUNDANCE; SIZE;
Keywords:
density estimates; spatial modeling; underwater acoustics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Jech, JM NE Fisheries Sci Ctr, 166 Water St, Woods Hole, MA 02543 USA NE Fisheries Sci Ctr 166 Water St Woods Hole MA USA 02543 543 USA
Citazione:
J.M. Jech e J.K. Horne, "Effects of in situ target spatial distributions on acoustic density estimates", ICES J MAR, 58(1), 2001, pp. 123-136

Abstract

One goal of acoustic-based abundance estimates is to accurately preserve spatial distributions of organism density and size within survey data. We simulated spatially-random and spatially-autocorrelated fish density and sigma (bs) distributions to quantify variance in density. abundance. and backscattering cross-sectional area estimates, and to examine the sensitivity of abundance estimates to organism spatial distributions and methods of estimating acoustic size. Our results show that it is difficult to simultaneouslyestimate fish density and maintain accurate sigma (bs)-frequency distributions. Among our acoustic backscatter estimation methods. a weighted-mean from a local search window provided optimal estimates of density. abundance and sigma (bs). Other methods tended to bias either sigma (bs) or density estimates. This analysis identifies the relative importance of variance sources when estimating organism density using spatially-indexed acoustic data.

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Documento generato il 20/09/20 alle ore 18:30:48