Subject: abstract - bottlenose/Atl. spotted dol. in Campeche Sound (fwd)

Mike Williamson (pita@www1.wheelock.edu)
Mon, 2 Mar 1998 08:45:34 -0500 (EST) 

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---------- Forwarded message ----------
Date: Wed, 25 Feb 1998 10:10:41 -0500
From: Dagmar Fertl <Dagmar_Fertl@mms.gov>
Reply-To: Marine Mammals Research and Conservation Discussion
     <MARMAM@UVVM.UVIC.CA>
To: MARMAM@UVVM.UVIC.CA
Subject: abstract - bottlenose/Atl. spotted dol. in Campeche Sound

     The following is posted as a courtesy to a colleague.  The paper is in
     Spanish, but the abstract provided with the paper is in English as
     well as Spanish.

     Please do not direct reprint inquiries to me, but to the author.

     Dagmar_Fertl@mms.gov
     ******************************************************************

     Delgado-Estrella, A.  1997.  Relacion de las toninas, _Tursiops
     truncatus_, y las toninas moteadas, _Stenella frontalis_, con la
     actividad camaronera en la Sonda de Campeche, Mexico.  Anales. Inst.
     Biol. Univ. Nac. Auton. Mexico, Ser. Zool. 68(2): 317-338.

     Laboratorio de Mastazoologia, Instituto de Biologia, UNAM, Apartado
     Postal 70-153, 04510 Mexico, D.F.


     Two surveys were made on shrimp boats (June and October, 1989) to
     record the activities and interactions with fisheries of bottlenose
     dolphins _Tursiops truncatus_ and Atlantic spotted dolphins _Stenella
     frontalis_ in the Campeche Sound, Mexico.  During 157 hours and 33
     days (11 on June and 22 on September-October) 687 bottlenose dolphins
     (5.5% of calves only on June) and 257 spotted dolphins (4.2% of
     calves) were sighted.  The dolphins stayed behind of the shrimp ships
     and ate the bycatch discarded (principally at night).  Because of the
     position of the dolphins in relation with the trawl nets, low
     possibilities of incidental catch exist.  Apparently, the dolphins
     synchronize the activities with the different trawling stages but not
     depending exclusively on the bycatch discard after the trawl.  The
     mean school size of _S. frontalis_ was larger than that of _T.
     truncatus_.  Bottlenose dolphins had a wide altitudinal distribution.