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Species assemblages of leptocephali ...

Miller, Michael J.

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Species assemblages of leptocephali in the Sargasso Sea and Florida Current.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Species assemblages of leptocephali in the Sargasso Sea and Florida Current./
作者:	Miller, Michael J.
面頁冊數:	138 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-02, Section: B, page: 0329.
Contained By:	Dissertation Abstracts International55-02B.
標題:	Biology, Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9418403

Species assemblages of leptocephali in the Sargasso Sea and Florida Current.
Miller, Michael J.

Species assemblages of leptocephali in the Sargasso Sea and Florida Current. - 138 p.

Source: Dissertation Abstracts International, Volume: 55-02, Section: B, page: 0329.

Thesis (Ph.D.)--The University of Maine, 1993.

Species assemblages of leptocephali (eel larvae) are described from the Subtropical Convergence Zone (STCZ) of the Sargasso Sea, around the Bahamas and in the Florida Current. Collections were made during seven cruises in late winter or early spring of five different years between 1979 and 1989. About 50 species from 13 families of eels were collected in seven transects across fronts, but fewer than 10 species were abundant in all transects. Four oceanic species, two Anguilla species and Conger oceanicus appeared to be spawning in the STCZ. Leptocephali of most species whose adults inhabit the continental shelf were consistently large in size and were more abundant at or south of fronts and in the western transects. Nemichthys scolopaceus, Serrivomer beanii and Ariosoma balearicum, were also more abundant in the west, but were abundant at stations on both sides of fronts. Discontinuities in the assemblages of Anguilla and most shelf species occurred at fronts that formed at the northernmost extent of Southern Sargasso Sea surface water. These species were rare or absent in mixed Convergence Zone water north of fronts. Cluster analysis and ordination of assemblages at 31 night stations reflected the greater species richness and abundance in the west and in the southern water.Subjects--Topical Terms:

783691
Biology, Oceanography.

Species assemblages of leptocephali in the Sargasso Sea and Florida Current.
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245 1 0 $a Species assemblages of leptocephali in the Sargasso Sea and Florida Current.
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500 $a Source: Dissertation Abstracts International, Volume: 55-02, Section: B, page: 0329.
500 $a Adviser: James D. McCleave.
502 $a Thesis (Ph.D.)--The University of Maine, 1993.
520 $a Species assemblages of leptocephali (eel larvae) are described from the Subtropical Convergence Zone (STCZ) of the Sargasso Sea, around the Bahamas and in the Florida Current. Collections were made during seven cruises in late winter or early spring of five different years between 1979 and 1989. About 50 species from 13 families of eels were collected in seven transects across fronts, but fewer than 10 species were abundant in all transects. Four oceanic species, two Anguilla species and Conger oceanicus appeared to be spawning in the STCZ. Leptocephali of most species whose adults inhabit the continental shelf were consistently large in size and were more abundant at or south of fronts and in the western transects. Nemichthys scolopaceus, Serrivomer beanii and Ariosoma balearicum, were also more abundant in the west, but were abundant at stations on both sides of fronts. Discontinuities in the assemblages of Anguilla and most shelf species occurred at fronts that formed at the northernmost extent of Southern Sargasso Sea surface water. These species were rare or absent in mixed Convergence Zone water north of fronts. Cluster analysis and ordination of assemblages at 31 night stations reflected the greater species richness and abundance in the west and in the southern water.
520 $a Assemblages of five shelf families were compared among the frontal transects, two additional cruises in the STCZ, stations in the Tongue of the Ocean and a cruise in the Florida Current. Cluster analysis and ordination indicated the presence of four general assemblages. Impoverished assemblages were found in the eastern STCZ and north of fronts. More species and greater densities of shelf species were found at or south of fronts in the western STCZ, with the richest assemblages closest to fronts. The greatest species richness was in the Florida Current and in the western frontal transect station. The western Florida Current assemblage was probably from the Gulf of Mexico, and ophichthids were most abundant in the Tongue of the Ocean. The smallest leptocephali were collected close to the Bahama banks. An anticyclonic circulation cell northeast of the northern Bahamas may facilitate entrainment of leptocephali from the Bahamas into fronts, which appear to transport them eastward.
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