Skip to content

Research at St Andrews

Purse-seine vessels as platforms for monitoring the population status of dolphin species in the eastern tropical Pacific Ocean: the use of fishing vessels as scientific platforms

Research output: Contribution to journalArticle

Author(s)

Cleridy E. Lennert-Cody, Mark N. Maunder, Paul C. Fiedler, Mihoko Minami, Tim Gerrodette, Jeremy Rusin, Carolina V. Minte-Vera, Michael Scott, Stephen Terrence Buckland

School/Research organisations

Abstract

In the eastern tropical Pacific Ocean, yellowfin tuna (Thunnus albacares) are often found in association with spotted (Stenella attenuata) and spinner (Stenella longirostris) dolphins. Purse-seine vessels use this co-occurrence to locate the tuna by searching for dolphins and associated birds. Data collected by onboard observers since the late 1970s were used to develop indices of relative abundance for dolphins, based on line-transect methodology, when the primary method of detection of dolphin herds was with binoculars. However, trend estimation was subsequently discontinued in 2000 due to concerns about changes in reporting rates of dolphin herd detections with increased use of helicopter and radar search. At present, as a result of a hiatus in fishery-independent surveys since 2006, fisheries observer data are the only source of information with which to monitor the status of eastern tropical Pacific Ocean dolphin populations. In this paper, trend estimation with the onboard observer data is revisited using a sightings-per-unit-effort approach. Despite different assumptions and model structure, the results indicate a lack of independence between the distribution of search effort and the search methods used, and the abundance of dolphin herds associated with tunas, on several spatial and temporal scales. This lack of independence poses a considerable challenge to the development of a reliable index of relative abundance for dolphins with these data. Given these results, alternatives for dolphin abundance estimation are discussed. One alternative is the use of purse-seine vessels for line-transect surveys during fishery closure periods. Another alternative is the use of purse-seine vessels during normal fishing operations as platforms for the collection of mark-recapture data (e.g., passive integrated transponder tags or genetics sampling). Life-history data collection, as a supplement to the collection of other data types, is also discussed. Further research and development is needed to assess whether these alternative methods will be useful.
Close

Details

Original languageEnglish
Pages (from-to)101-113
Number of pages13
JournalFisheries Research
Volume178
Early online date6 Nov 2015
DOIs
Publication statusPublished - Jun 2016

    Research areas

  • Dolphin abundance, Line-transect, CPUE, Bycatch, Generalized additive model

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

View graph of relations

Related by author

  1. Model selection with overdispersed distance sampling data

    Howe, E. J., Buckland, S. T., Després-Einspenner, M-L. & Kühl, H. S., Jan 2019, In : Methods in Ecology and Evolution. 10, 1, p. 38-47

    Research output: Contribution to journalArticle

  2. Corrigendum: The number and distribution of polar bears in the western Barents Sea

    Aars, J., Marques, T. A., Lone, K., Andersen, M., Wiig, Ø., Fløystad, I. M. B., Hagen, S. B. & Buckland, S. T., 22 May 2018, In : Polar Research. 37, 1, 1457880.

    Research output: Contribution to journalComment/debate

  3. Attributing changes in the distribution of species abundance to weather variables using the example of British breeding birds

    Oedekoven, C. S., Elston, D. A., Harrison, P. J., Brewer, M. J., Buckland, S. T., Johnston, A., Foster, S. & Pearce-Higgins, J. W., Dec 2017, In : Methods in Ecology and Evolution. 8, 12, p. 1690-1702

    Research output: Contribution to journalArticle

  4. Point process models for spatio-temporal distance sampling data from a large-scale survey of blue whales

    Yuan, Y., Bachl, F. E., Lindgren, F., Borchers, D. L., Illian, J. B., Buckland, S. T., Rue, H. & Gerrodette, T., Dec 2017, In : Annals of Applied Statistics. 11, 4, p. 2270-2297

    Research output: Contribution to journalArticle

  5. Distance sampling with camera traps

    Howe, E. J., Buckland, S. T., Després-Einspenner, M-L. & Kühl, H., Nov 2017, In : Methods in Ecology and Evolution. 8, 11, p. 1558-1565

    Research output: Contribution to journalArticle

Related by journal

  1. Fine-scale movement patterns and behavioral states of gray triggerfish Balistes capriscus determined from acoustic telemetry and hidden Markov models

    Bacheler, N. M., Michelot, T., Cheshire, R. T. & Shertzer, K. W., 19 Mar 2019, In : Fisheries Research. 215, p. 76-89 14 p.

    Research output: Contribution to journalArticle

  2. An investigation of avoidance by Antarctic krill of RRS James Clark Ross using the Autosub-2 autonomous underwater vehicle

    Brierley, A. S., Fernandes, PG., Brandon, MA., Armstrong, F., Millard, NW., McPhail, SD., Stevenson, P., Pebody, M., Perrett, J., Squires, M., Bone, DG. & Griffiths, G., Feb 2003, In : Fisheries Research. 60, 2-3, p. 569-576 8 p.

    Research output: Contribution to journalArticle

  3. A PPS sample survey of English fishing vessels to estimate discarding and retention of North Sea cod, haddock, and whiting

    Cotter, AJR., Course, GP., Buckland, S. T. & Garrod, C., Mar 2002, In : Fisheries Research. 55, 1-3, p. 25-35 11 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Fisheries Research (Journal)

    Nora Nell Hanson (Reviewer)
    Nov 2013

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  2. Fisheries Research (Journal)

    David Louis Borchers (Editor)
    2004 → …

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

ID: 241943912