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Habitat utilization, diet, and forag...

Young, Robert Franklin.

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Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus./
Author:	Young, Robert Franklin.
Description:	228 p.
Notes:	Source: Dissertation Abstracts International, Volume: 54-03, Section: B, page: 1209.
Contained By:	Dissertation Abstracts International54-03B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9318353

Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus.
Young, Robert Franklin.

Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus. - 228 p.

Source: Dissertation Abstracts International, Volume: 54-03, Section: B, page: 1209.

Thesis (Ph.D.)--University of Rhode Island, 1992.

Diet, foraging behavior, and shelter site use were compared between two species of moray eels (Muraenidae), the spotted moray, Gymnothorax moringa, and the purplemouth moray, Gymnothorax vicinus, in the shallow backreef habitat of the Belize Barrier Reef. Dietary patterns were examined by analyzing the stomach contents of captured eels, foraging behavior was examined by tracking eels tagged with acoustic transmitter tags, and shelter site use was examined through daily censuses of shelter sites in conjunction with mark and recapture studies. Patterns of shelter site use were similar, but the two species were observed to significantly partition food resources and to have weather-related differences in foraging patterns. G. moringa foraged and fed significantly more often than G. vicinus. Although both species fed on a variety of overlapping prey items, G. moringa preferred crabs (58.3% by wet weight) while G. vicinus was primarily piscivorous (60.0% by wet weight). Niche overlap was significantly less than would be expected by random feeding patterns. Based on stomach contents and tracking data, G. vicinus foraged and fed almost exclusively on inclement nights, as defined by sea state and weather conditions. Both species captured a higher proportion of fish on inclement nights, while G. moringa captured mainly crabs on calm nights when G. vicinus seldom foraged. For both species, foraging events were primarily nocturnal and highly variable in duration and distance. Forays ranged from less than one hour to over nine hours, with distances up to 115 meters from the shelter site. Foraging paths were primarily, but not exclusively, in the open grassbed away from patch reefs, rubble rocks, or other shelter. Patterns of shelter site use were also similar and highly variable for both species. Over 70% of the continuous residences at a single site were less than five days in length. A surplus of shelter sites were available, based on daily abundance and the total number of observed eel sites. These patterns indicate resource partitioning without classically limited resources. This is consistent with recent theories of reef fish community structure which emphasize competitive effects on growth rates rather than mortality.Subjects--Topical Terms:

1017726
Biology, Ecology.

Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus.
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035 $a (UnM)AAI9318353
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100 1 $a Young, Robert Franklin. $3 1914678
245 1 0 $a Habitat utilization, diet, and foraging behavior of two species of Caribbean moray eels, Gymnothorax moringa and Gymnothorax vicinus.
300 $a 228 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-03, Section: B, page: 1209.
500 $a Adviser: Howard E. Winn.
502 $a Thesis (Ph.D.)--University of Rhode Island, 1992.
520 $a Diet, foraging behavior, and shelter site use were compared between two species of moray eels (Muraenidae), the spotted moray, Gymnothorax moringa, and the purplemouth moray, Gymnothorax vicinus, in the shallow backreef habitat of the Belize Barrier Reef. Dietary patterns were examined by analyzing the stomach contents of captured eels, foraging behavior was examined by tracking eels tagged with acoustic transmitter tags, and shelter site use was examined through daily censuses of shelter sites in conjunction with mark and recapture studies. Patterns of shelter site use were similar, but the two species were observed to significantly partition food resources and to have weather-related differences in foraging patterns. G. moringa foraged and fed significantly more often than G. vicinus. Although both species fed on a variety of overlapping prey items, G. moringa preferred crabs (58.3% by wet weight) while G. vicinus was primarily piscivorous (60.0% by wet weight). Niche overlap was significantly less than would be expected by random feeding patterns. Based on stomach contents and tracking data, G. vicinus foraged and fed almost exclusively on inclement nights, as defined by sea state and weather conditions. Both species captured a higher proportion of fish on inclement nights, while G. moringa captured mainly crabs on calm nights when G. vicinus seldom foraged. For both species, foraging events were primarily nocturnal and highly variable in duration and distance. Forays ranged from less than one hour to over nine hours, with distances up to 115 meters from the shelter site. Foraging paths were primarily, but not exclusively, in the open grassbed away from patch reefs, rubble rocks, or other shelter. Patterns of shelter site use were also similar and highly variable for both species. Over 70% of the continuous residences at a single site were less than five days in length. A surplus of shelter sites were available, based on daily abundance and the total number of observed eel sites. These patterns indicate resource partitioning without classically limited resources. This is consistent with recent theories of reef fish community structure which emphasize competitive effects on growth rates rather than mortality.
590 $a School code: 0186.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Agriculture, Fisheries and Aquaculture. $3 1020913
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710 2 0 $a University of Rhode Island. $3 1022014
773 0 $t Dissertation Abstracts International $g 54-03B.
790 1 0 $a Winn, Howard E., $e advisor
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792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9318353