Northern range extension, abundance and distribution of Pacific coastal Bottlenose doplhins (Tursiops truncatus gilli) in Monterey Bay, California

Maldini, Daniela (1996) Northern range extension, abundance and distribution of Pacific coastal Bottlenose doplhins (Tursiops truncatus gilli) in Monterey Bay, California. Masters Thesis, San Jose State University, 88pp.

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Abstract

Pacific coastal bottlenose dolphins (Tursiops truncatus gilli) have apparently moved to Monterey Bay as a result of a shift north of their known range. Between 1983 and 1993, 417 sightings were reported off central California. Eighty-four boat-based surveys, between October 1990 and November 1993, resulted in the photo-identification of 68 uniquely marked individuals. School size ranged between 2 and 35 animals (mean = 16.60, S.D. = 7.72). Forty-three (63%) of the dolphins identified were previously photographed in the Southern California Bight before 1989. Jolly-Seber population estimates indicated an increase in the Monterey Bay population from 1990 to 1993. At least 13 of the photo-identified dolphins were present in Monterey Bay throughout the study period. All but two of the calculated coefficients of association were 0.35, indicating a strong bond among resident animals. The occurrence of an El Niño from January 1992 to the end of 1993 may have affected the number of animals present in the bay: mean school size was significantly greater during El Niño.

Item Type: Thesis
Title: Northern range extension, abundance and distribution of Pacific coastal Bottlenose doplhins (Tursiops truncatus gilli) in Monterey Bay, California
Personal Creator/Author:
CreatorsEmail
Maldini, Danieladmaldini@okeanis.org
Number of Pages: 88
Date: 1996
Latitude: 36.8
Longitude: 121.79
Department: Moss Landing Marine Laboratories
Institution: San Jose State University
Contact Email Address: dmaldini@okeanis.org
Issuing Agency: Moss Landing Marine Laboratories
Uncontrolled Keywords: tursiops truncatus; Monterey Bay; California; abundance; distribution; ecology; bottlenose dolphin; Jolly-Seber;
Subjects: Ecology
Biology
Environment
Item ID: 2667
Depositing User: Dr Daniela Maldini
Date Deposited: 26 Oct 2009 12:59
Last Modified: 29 Sep 2011 18:38
URI: http://aquaticcommons.org/id/eprint/2667

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