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Estimating the Lower Temperature Limit of Bottlenose Dolphins Along the North Carolina Coast

dc.contributor.advisor Halpin, Patrick N Shoemaker, Mandy 2007-06-22T19:43:12Z 2007-06-22T19:43:12Z 2004
dc.description.abstract During winter, the coastal ecotype of bottlenose dolphins are at the northern limit of their range off the coast of North Carolina. In this study, the distribution of coastal bottlenose dolphins in North Carolina was evaluated in response to variation in sea surface temperature to determine whether the distribution of dolphins was limited directly or indirectly by winter temperature minima. Observations of dolphin distribution were obtained from monthly aerial surveys conducted along the North Carolina coast during February 2000 through July 2001. Sea surface temperatures were obtained for each survey from NOAA’s Pathfinder satellite, using PO.DAAC Ocean ESIP Tool (POET). Where necessary, the sea surface temperature data was interpolated (krigged) over areas of cloud cover. The northern latitudinal and lower temperature distribution was determined for each survey. During winter months bottlenose dolphins were not distributed throughout their known range of 10-32 °C. Dolphins may be limited directly by temperature, due to the limits of their thermal neutral zone, or indirectly by temperature, through distribution of their prey. To determine how temperature is affecting dolphin distribution in the Western North Atlantic, future research should focus on determining the thermal neutral zone of dolphins in this region. In addition, it would be useful to build a model including other dynamic factors that may affect dolphin distribution. Although results suggest that more research is necessary, there is potential for using results from this type of analysis for management.
dc.format.extent 103592 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject Bottlenose dolphins (Tursiops truncatus)
dc.subject Tursiops truncatus
dc.subject Coastal
dc.subject strategic stocks
dc.subject distribution
dc.subject surface sea temperature
dc.subject North Carolina
dc.subject Western North Atlantic
dc.subject spatial analysis
dc.subject Geographic Information System (GIS)
dc.title Estimating the Lower Temperature Limit of Bottlenose Dolphins Along the North Carolina Coast
dc.type Master's project
dc.department Nicholas School of the Environment and Earth Sciences

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