CZS Sarasota Dolphin Program

Monday, April 28, 2008

Franciscana Dolphins Tracking Day #55

Kure/Tunken are together and headed north again, to the east of Banco Nordeste. Kona and Nahuel were together in the channel in Bahia San Blas yesterday, but do not appear to be together now.

Friday, April 25, 2008

Franciscana Dolphins Tracking Day #53

The four dolphins are inside the bay. Early this morning it appeared that all four were in the same general area of the bay, but it is unclear if this continued as they moved farther into the bay.

Thursday, April 24, 2008

Franciscana Dolphins Tracking Day #52

Kure/Tunken are inside the bay, while Kona/Nahuel are together to the north of the mouth of the bay.

Franciscana Dolphins Tracking Day #51

The pairs continue their patterns of the last few days in Bahia San Blas.

Tuesday, April 22, 2008

Franciscana Dolphins Tracking Day #50

The pair of Kure/Tunken is farther inside the bay than is the pair of Kona/Nahuel this morning.

Science as it Happens!

Ranging Patterns and Habitat Use of Franciscana Dolphins off Argentina: 2008

In March 2008, Chicago Zoological Society conservation scientists Randall Wells, Jason Allen, and Aaron Barleycorn returned to Bahia San Blas, Argentina, to work with Pablo Bordino and his dedicated team of students, colleagues, and fishermen, and a veterinary team from Disney’s Animal Programs, to conduct additional satellite-linked tagging of franciscana dolphins. Building on the tagging and tracking work during 2007 that indicated a high degree of residency to Bahia San Blas over periods as long as six months, the next phase of the project was designed to address specific questions about:

1) what part of the water column the dolphins use – if the dolphins show preference for water of particular depths, then fishermen might be able to set their nets at different depths in order to avoid the dolphins. Up to three satellite-linked transmitters with time-depth recorders (TDRs) will provide information on the depths of dives as well as locations.

2) developing correction factors for aerial and boat surveys for dolphin abundance that take into account the dive patterns of the animals – the TDRs provide information on dive durations and time spent at specific depths where the animals might be visible to scientists.

3) social patterns – deploying tags with identical duty cycles, it is possible to determine if the animals exhibit a stable or fluid pattern of social associations, through examination of their location data to see if they remain together or separate. In addition to the location data from the TDR tags, as many as 5 location-only tags may be deployed. Genetic samples collected during the tagging process will allow determination of relatedness of dolphins caught together.

The first two transmitters, both TDRs, were deployed on a juvenile male (#42483) and an adult female (#42485) on March 4, 2008. As data are received from these and subsequent transmitters, they will be displayed on this site, as maps showing dolphin locations.

The radio transmitter ("tag") was specially designed for dolphins and weighs only 15 grams. The expected battery life is approximately four weeks, and the tag naturally falls off some time later.

Major support for this project was provided by the Chicago Zoological Society and Disney’s Animal Programs, with tags and tag data processing assistance provided by Dolphin Quest.