HR: 0800h
AN: OS31B-0408    [Abstracts]
TI: The Dispersal and Persistence of Invasive Marine Species
AU: * Glick, E R
EM: eglick@brynmawr.edu
AF: Bryn Mawr College, 101 N. Merion Ave., Bryn Mawr, PA 19010, United States
AU: Pringle, J
EM: jpringle@unh.edu
AF: University of New Hampshire, 39 College Rd., Durham, NH 03824, United States
AB: The spread of invasive marine species is a continuing problem throughout the world, though not entirely understood. Why do some species invade more easily than the rest? How are the range limits of these species set? Recent research (Byers & Pringle 2006, Pringle & Wares 2007) has produced retention criteria that determine whether a coastal species with a benthic adult stage and planktonic larvae can be retained within its range and invade in the direction opposite that of the mean current experienced by the larvae (i.e. upstream). These results however, are only accurate for Gaussian dispersal kernels. For kernels whose kurtosis differs from a Gaussian's, the retention criteria becomes increasingly inaccurate as the mean current increases. Using recent results of Lutscher (2006), we find an improved retention criterion which is much more accurate for non- Gaussian dispersal kernels. The importance of considering non-Gaussian kernels is illustrated for a number of commonly used dispersal kernels, and the relevance of these calculations is illustrated by considering the northward limit of invasion of Hemigrapsus sanguineus, an important invader in the Gulf of Maine.
DE: 4200 OCEANOGRAPHY: GENERAL
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting