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IMS Lecture Notes–Monograph Series Three Months Journeying of a Hawaiian.pdf

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IMS Lecture Notes–Monograph Series Three Months Journeying of a Hawaiian

IMS Lecture Notes–Monograph Series Three Months Journeying of a Hawaiian Monk Seal David R. Brillinger,? Brent S. Stewart,? and Charles L. Littnan University of California at Berkeley, Hubbs-SeaWorld Research Institute, and Pacific Islands Fisheries Science Center, NOAA Fisheries Abstract: Hawaiian monk seals (Monachus schauinslandi) are endemic to the Hawaiian Islands and are the most endangered species of marine mammal that lives entirely within the jurisdiction of the United States. The species numbers around 1300 and has been declining owing, among other things, to poor juve- nile survival which is evidently related to poor foraging success. Consequently, data have been collected recently on the foraging habitats, movements, and behaviors of monk seals throughout the Northwestern and main Hawaiian Is- lands. Our work here is directed to exploring a data set located in a relatively shallow offshore submerged bank (Penguin Bank) in our search of a model for a seal’s journey. The work ends by fitting a stochastic differential equation (SDE) that mimics some aspects of the behavior of seals by working with location data collected for one seal. The SDE is found by developing a time varying potential function with two points of attraction. The times of location are irregularly spaced and not close together geographicaly, leading to some difficulties of interpretation. Synthetic plots generated using the model are employed to assess its reasonableness spatially and temporally. One aspect is that the animal stays mainly southwest of Molokai. The work led to the estimation of the lengths and locations of the seal’s foraging trips. 1. Introduction This paper studies a three month journey of a juvenile female (4-5 years old) Hawai- ian monk seal, (Monachus schauinslandi) while she foraged and occasionally hauled out ashore. She was tagged and released at the southwest corner of Molokai, see Figure 1. (The animal was tracked from 13 April 2004 through 27 July 2004.) She had