Inter-annual and seasonal trends in cetacean distribution, density and abundance off southern California

TitleInter-annual and seasonal trends in cetacean distribution, density and abundance off southern California
Publication TypeJournal Article
Year of Publication2015
AuthorsCampbell GS, Thomas L, Whitaker K, Douglas AB, Calambokidis J, Hildebrand JA
JournalDeep-Sea Research Part Ii-Topical Studies in Oceanography
Volume112
Pagination143-157
Date Published2015/02
ISBN Number0967-0645
Accession NumberWOS:000350921700013
Abstract

Trends in cetacean density and distribution off southern California were assessed through visual line-transect surveys during thirty-seven California Cooperative Oceanic Fisheries Investigations (CalCOFI) cruises from July 2004-November 2013. From sightings of the six most commonly encountered cetacean species, seasonal, annual and overall density estimates were calculated. Blue whales (Balaenoptera musculus), fin whales (Balaenoptera physalus) and humpback whales (Megaptera novaeangliae) were the most frequently sighted baleen whales with overall densities of 0.91/1000 km(2) (CV=0.27), 2.73/1000 km(2) (CV=0.19), and 1.17/1000 km(2) (CV=0.21) respectively. Species specific density estimates, stratified by cruise, were analyzed using a generalized additive model to estimate long-term trends and correct for seasonal imbalances. Variances were estimated using a non-parametric bootstrap with one day of effort as the sampling unit. Blue whales were primarily observed during summer and fall while fin and humpback whales were observed year-round with peaks in density during summer and spring respectively. Short-beaked common dolphins (Delphinus delphis), Pacific white-sided dolphins (Lagenorhynchus obliquidens) and Dall's porpoise (Phocoenoidesdalli) were the most frequently encountered small cetaceans with overall densities of 705.83/1000 km(2) (CV=0.22), 51.98/1000 km(2) (CV=0.27), and 21.37/1000 km(2) (CV=0.19) respectively. Seasonally, short-beaked common dolphins were most abundant in winter whereas Pacific white-sided dolphins and Dall's porpoise were most abundant during spring. There were no significant long-term changes in blue whale, fin whale, humpback whale, short-beaked common dolphin or Dall's porpoise densities while Pacific white-sided dolphins exhibited a significant decrease in density across the ten-year study. The results from this study were fundamentally consistent with earlier studies, but provide greater temporal and seasonal resolution. (C) 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

DOI10.1016/j.dsr2.2014.10.008
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