Skip to content

Research at St Andrews

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

Research output: Contribution to journalArticle

Author(s)

G.S. Campbell, L. Thomas, K. Whitaker, A.B. Douglas, J. Calambokidis, J.A. Hildebrand

School/Research organisations

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 km2 (CV=0.27), 2.73/1000 km2 (CV=0.19), and 1.17/1000 km2 (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 km2 (CV=0.22), 51.98/1000 km2 (CV=0.27), and 21.37/1000 km2 (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
Close

Details

Original languageEnglish
Pages (from-to)143-157
Number of pages15
JournalDeep Sea Research Part II: Topical Studies in Oceanography
Volume112
Early online date24 Oct 2014
DOIs
Publication statusPublished - Feb 2015

    Research areas

  • Cetaceans, Line transect, Density, Abundance, Distribution, Trends, Southern California, CalCOFI

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Estimating effective detection area of static passive acoustic data loggers from playback experiments with cetacean vocalisations

    Nuuttila, H. K., Brundiers, K., Dähne, M., Koblitz, J. C., Thomas, L., Courtene-Jones, W., Evans, P. G. H., Turner, J. R., Bennell, J. D. & Hiddink, J. G., Dec 2018, In : Methods in Ecology and Evolution. 9, 12, p. 2362-2371

    Research output: Contribution to journalArticle

  2. Basin-scale distribution of harbour porpoises in the Baltic Sea provides basis for effective conservation actions

    Carlén, I., Thomas, L., Carlström, J., Amundin, M., Teilmann, J., Tregenza, N., Tougaard, J., Koblitz, J. C., Sveegaard, S., Wennerberg, D., Loisa, O., Dähne, M., Brundiers, K., Kosecka, M., Kyhn, L. A., Ljungqvist, C. T., Pawliczka, I., Koza, R., Arciszewski, B., Galatius, A. & 9 othersJabbusch, M., Laaksonlaita, J., Niemi, J., Lyytinen, S., Gallus, A., Benke, H., Blankett, P., Skóra, K. E. & Acevedo-Gutiérrez, A., Oct 2018, In : Biological Conservation. 226, p. 42-53 12 p.

    Research output: Contribution to journalArticle

  3. Understanding the population consequences of disturbance

    Pirotta, E., Booth, C. G., Costa, D. P., Fleishman, E., Kraus, S. D., Lusseau, D., Moretti, D., New, L. F., Schick, R. S., Schwarz, L. K., Simmons, S. E., Thomas, L., Tyack, P. L., Weise, M. J., Wells, R. S. & Harwood, J., 12 Sep 2018, In : Ecology and Evolution. Early View, 13 p.

    Research output: Contribution to journalReview article

  4. Fin whale density and distribution estimation using acoustic bearings derived from sparse arrays

    Harris, D. V., Miksis-Olds, J. L., Vernon, J. A. & Thomas, L., May 2018, In : Journal of the Acoustical Society of America. 143, 5, p. 2980-2993 14 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Beluga whales in the western Beaufort Sea: current state of knowledge on timing, distribution, habitat use and environmental drivers

    Stafford, K. M., Ferguson, M. C., Hauser, D. D. W., Okkonen, S. R., Berchok, C. L., Citta, J. J., Clarke, J. T., Garland, E. C., Jones, J. & Suydam, R. S., Jun 2018, In : Deep Sea Research Part II: Topical Studies in Oceanography. 152, p. 182-194

    Research output: Contribution to journalArticle

  2. Distribution, abundance and habitat use of deep diving cetaceans in the North-East Atlantic

    Rogan, E., Cañadas, A., Macleod, K., Santos, M. B., Mikkelsen, B., Uriarte, A., Van Canneyt, O., Antonio Vázquez, J. & Hammond, P. S., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 8-19

    Research output: Contribution to journalArticle

  3. Estimating cetacean density and abundance in the Central and Western Mediterranean Sea through aerial surveys: implications for management

    Panigada, S., Lauriano, G., Donovan, G., Pierantonio, N., Cañadas, A., Vázquez, J. A. & Burt, L., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 41-58 18 p.

    Research output: Contribution to journalArticle

  4. Grey and harbour seals in France: distribution at sea, connectivity and trends in abundance at haulout sites

    Vincent, C., Huon, M., Caurant, F., Dabin, W., Deniau, A., Dixneuf, S., Dupuis, L., Elder, J-F., Fremau, M-H., Hassani, S., Hemon, A., Karpouzopoulos, J., Lefeuvre, C., McConnell, B. J., Moss, S. E. W., Provost, P., Spitz, J., Turpin, Y. & Ridoux, V., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 294-305

    Research output: Contribution to journalArticle

  5. Harbour porpoise distribution can vary at small spatiotemporal scales in energetic habitats

    Benjamins, S., van Geel, N., Hastie, G., Elliott, J. & Wilson, B., Jul 2017, In : Deep Sea Research Part II: Topical Studies in Oceanography. 141, p. 191-202 12 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Deep Sea Research Part II: Topical Studies in Oceanography (Journal)

    Patrick Miller (Editor)
    2007 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

ID: 167454055