Effects of study area size on home range estimates of common bottlenose dolphins Tursiops truncatus

Current Zoology
Samantha R NekolnyQuincy A Gibson

Abstract

Knowledge of an animal's home range is a crucial component in making informed management decisions. However, many home range studies are limited by study area size, and therefore may underestimate the size of the home range. In many cases, individuals have been shown to travel outside of the study area and utilize a larger area than estimated by the study design. In this study, data collected by multiple research groups studying bottlenose dolphins on the east coast of Florida were combined to determine how home range estimates increased with increasing study area size. Home range analyses utilized photo-identification data collected from 6 study areas throughout the St Johns River (SJR; Jacksonville, FL, USA) and adjacent waterways, extending a total of 253 km to the southern end of Mosquito Lagoon in the Indian River Lagoon Estuarine System. Univariate kernel density estimates (KDEs) were computed for individuals with 10 or more sightings (n = 20). Kernels were calculated for the primary study area (SJR) first, then additional kernels were calculated by combining the SJR and the next adjacent waterway; this continued in an additive fashion until all study areas were included. The 95% and 50% KDEs calculated for the SJR alone ...Continue Reading

References

Oct 13, 2006·The Journal of Animal Ecology·Luca BörgerTim Coulson
Dec 22, 2006·Conservation Biology : the Journal of the Society for Conservation Biology·Lars BejderMichael Krützen
Jul 3, 2013·Marine Pollution Bulletin·Enrico PirottaDavid Lusseau

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