Abstract: Dolphin Research, Texas

Michael Williamson (whe_william@flo.org)
Mon, 5 Jan 1995 12:27:56

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From: Michael Williamson <WHE_WILLIAM@FLO.ORG>
Subject: Abstract: Dolphin Research, Texas
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From:         Dagmar Fertl <fertld@tamug2.tamu.edu>
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Fertl,D.  1994.  Occurrence patterns and behavior of bottlenose dolphins
(Tursiops truncatus) in the Galveston Ship Channel, Texas.  Texas Journal
of Science 46:299-317.
 
Abstract:
 
Surveys for bottlenose dolphins (Tursiops truncatus) were conducted in the
Galveston Ship Channel between January 1990 and December 1992.  Dolphins
occurred year-round with seasonal peaks in spring and autumn.  Many of the
dolphins were well-marked and some appear to have scars resulting from
human interactions.  Dolphins observed in the Galveston Ship Channel appear
to be part of an open population with no pronounced changes in the
population size.  Fifty-six individuals (23% of the individuals identified)
were observed in all three years.  Thirteen (23%) of the 56 dolphins were
photographed as early as 1986/1987 in this same area, nine of these were
determined to be females.  Seventy-five percent of the 240 identified
dolphins were sighted more than once during 1990-1992.  Group sizes were
small (mean = 3.2 +- S.D.2.02 for groups without mother/calf pairs; mean =
2.9 +- S.D.2.10 for goups with mother/calf pairs), and solitary dolphins
were frequent (23% of groups with no mother/calf pairs were single
individuals).  The smallest groups, both with and without mother/calf pairs
were observed in association with shrimp boats (mean = 2.7 +- S.D.1.80 and
mean = 2.7 +- S.D.1.78, respectively), while the largest were socializing
(mean = 3.7 +- S.D.1.81 and mean = 4.2 +- S.D.2.06, respectively).
 
 
 
 
Dagmar C. Fertl, Coordinator of University Research, Texas A&M University @
Galveston, Galveston, TX 77551.  Ph:(409) 740-4737; Fax:(409) 740-4787
fertld@tamug2.tamu.edu