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The ecology and phylogeography of ci...

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The ecology and phylogeography of ciguatera on coral reefs.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The ecology and phylogeography of ciguatera on coral reefs./
Author:	Richlen, Mindy Lou.
Description:	265 p.
Notes:	Adviser: Phillip Lobel.
Contained By:	Dissertation Abstracts International68-08B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279958
ISBN:	9780549210948

The ecology and phylogeography of ciguatera on coral reefs.
Richlen, Mindy Lou.

The ecology and phylogeography of ciguatera on coral reefs. - 265 p.

Adviser: Phillip Lobel.

Thesis (Ph.D.)--Boston University, 2008.

Ciguatera is the most frequently reported marine toxin disease in the world; however, the ecological and physiological factors underlying toxicity are not well known. This dissertation describes research in three areas fundamental to understanding the preponderance of ciguatera: the biodiversity of ciguatera dinoflagellates, phylogeography of Gambierdiscus toxicus, and herbivore digestive mechanisms.

ISBN: 9780549210948Subjects--Topical Terms:

1017726
Biology, Ecology.

The ecology and phylogeography of ciguatera on coral reefs.
LDR:03511nam 2200337 a 45 001 852053
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008 100629s2008 ||||||||||||||||| ||eng d
020 $a 9780549210948
035 $a (UMI)AAI3279958
035 $a AAI3279958
040 $a UMI $c UMI
100 1 $a Richlen, Mindy Lou. $3 1017725
245 1 4 $a The ecology and phylogeography of ciguatera on coral reefs.
300 $a 265 p.
500 $a Adviser: Phillip Lobel.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 4959.
502 $a Thesis (Ph.D.)--Boston University, 2008.
520 $a Ciguatera is the most frequently reported marine toxin disease in the world; however, the ecological and physiological factors underlying toxicity are not well known. This dissertation describes research in three areas fundamental to understanding the preponderance of ciguatera: the biodiversity of ciguatera dinoflagellates, phylogeography of Gambierdiscus toxicus, and herbivore digestive mechanisms.
520 $a The ecology of ciguatera dinoflagellates was examined at Johnston Atoll to determine how habitat, water motion, and depth correlate with biodiversity. Total dinoflagellate abundance was positively correlated with depth and negatively correlated with water motion. Prorocentrum spp. and G. toxicus were dominant in lagoon/channel habitats and Ostreopsis spp. were dominant in reef crest/back reef habitats; furthermore, habitat separation existed between Ostreopsis and Prorocentrum species. These results further demonstrate that patterns of abundance, community composition and species associations documented in the Caribbean also exist in the Pacific.
520 $a Genetic and morphological variability in G. toxicus was examined to determine if heterogeneous patterns of toxicity originate from multiple genetic strains. A new method of extracting DNA from single microalgal cells was developed for this research. The large and small-subunit ribosomal DNA phylogenies showed that G. toxicus comprises four distinct lineages, one of which is also morphologically distinct. The remaining clades are morphologically homogeneous and may represent cryptic species. The taxonomic classification of Gambierdiscus spp. based on epithecal features is not supported, suggesting that a taxonomic revision to this genus is appropriate.
520 $a Marine herbivorous fishes with different alimentary physiologies were examined to determine if digestive mechanisms contribute to toxicity. The effects of gastric lysis and mechanical disruption were simulated followed by direct examination of G. toxicus cell digestibility using fishes in aquaria. Cell fragmentation was highest in scarids; however, most cells in the gastrointestinal tract of all fishes were intact, regardless of digestive morphology. This study suggests that ingestion rates are more important than digestive morphology in explaining patterns of toxicity in herbivores.
520 $a These results are relevant to understanding environmental patterns of toxicity and suggest that localized toxicity originates from both the molecular and ecological composition of the benthic dinoflagellate community and ingestion rates of herbivorous fishes.
590 $a School code: 0017.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Molecular. $3 1017719
650 4 $a Biology, Oceanography. $3 783691
690 $a 0307
690 $a 0329
690 $a 0416
710 2 $a Boston University. $3 1017454
773 0 $t Dissertation Abstracts International $g 68-08B.
790 $a 0017
790 1 0 $a Lobel, Phillip, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279958