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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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.
|Title:||Northern range extension, abundance and distribution of Pacific coastal Bottlenose doplhins (Tursiops truncatus gilli) in Monterey Bay, California|
|Number of Pages:||88|
|Department:||Moss Landing Marine Laboratories|
|Institution:||San Jose State University|
|Contact Email Address:||email@example.com|
|Issuing Agency:||Moss Landing Marine Laboratories|
|Uncontrolled Keywords:||tursiops truncatus; Monterey Bay; California; abundance; distribution; ecology; bottlenose dolphin; Jolly-Seber;|
|Depositing User:||Dr Daniela Maldini|
|Date Deposited:||26 Oct 2009 12:59|
|Last Modified:||29 Sep 2011 18:38|
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