. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 28 °cm. Figure 1. Location of the Lasaea sampling sites in the western North Atlantic, plotted onto a satellite image of sea-surface temperatures (mod- ified from Thurman, 1997). The body of warm water flowing through the Florida Straits represents the Florida Current portion of the Gulf Stream System. Past Cape Hatteras. the Gulf Stream proper leaves the continental slope and develops a series of meanders that pinch off persistent mesoscale eddies. Cold eddies migrate southward and approach Bermuda. nary (Nunn, 1994) and, a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 28 °cm. Figure 1. Location of the Lasaea sampling sites in the western North Atlantic, plotted onto a satellite image of sea-surface temperatures (mod- ified from Thurman, 1997). The body of warm water flowing through the Florida Straits represents the Florida Current portion of the Gulf Stream System. Past Cape Hatteras. the Gulf Stream proper leaves the continental slope and develops a series of meanders that pinch off persistent mesoscale eddies. Cold eddies migrate southward and approach Bermuda. nary (Nunn, 1994) and, although late Pleistocene (last 130,000 years) sea-level changes ranged up to 25 in, the island group was not submerged during this period (Harmon ci <//.. 1978. 1981). The Bermudan shallow-water marine fauna encompasses a low level () of endemic species and represents a moderately impoverished oceanic extension of the Carib- bean fauna (Sterrer, 1986, 1998). Twenty-eight of a total of 49 common nearshore molluscs found throughout the Ca- ribbean also occur on this oceanic island platform (Warmke and Abbott, 1961), and there is some evidence for a partial turnover of the Bermudan marine rnalacofauna on ecologi- cal timescales (Abbott and Jensen. 1967; Sterrer, 1986). The nearest source populations for Bermudan marine taxa of Caribbean origin are about 1500 km to the southwest, in southern Florida and the Bahamas. Based on net transport of drift bottles, this distance represents a minimum passage of 21-30 days for passive pelagic transport of larvae or rafted propagules (Jackson, 1986). Such a time frame does not pose a serious obstacle for species with long-lived pelagic larvae, but may approach the upper limit for many species with faster developing pelagic larval stages. The few data available on genetic distances of Bermudan marine inver- tebrates from Caribbean conspecitics are consistent with this view (Mitton ct <//., 1989; Hateley and Sleeter, 1993). A number o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
