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Life cycles and systematics of Mesoc...

Padgett, Kerry A.

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Life cycles and systematics of Mesocestoides spp. tapeworms.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Life cycles and systematics of Mesocestoides spp. tapeworms./
作者:	Padgett, Kerry A.
面頁冊數:	101 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2748.
Contained By:	Dissertation Abstracts International65-06B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3137585
ISBN:	0496847597

Life cycles and systematics of Mesocestoides spp. tapeworms.
Padgett, Kerry A.

Life cycles and systematics of Mesocestoides spp. tapeworms. - 101 p.

Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2748.

Thesis (Ph.D.)--University of California, Davis, 2004.

This dissertation focuses on the life cycles and systematics of 3 molecular strains of Mesocestoides tapeworms that represent different evolutionary lineages (clades A, B, and C) found in Californian domestic carnivores and wildlife. In Chapter 1, life cycles of Mesocestoides clades A and B were investigated by identifying sylvatic hosts and by conducting experimental feeding trials with immature tapeworm stages (proglottids, tetrathyridia, and acephalic metacestodes). Tetrathyridia (clades A and B) were found in deer mice (Peromyscus maniculatus), and adult tapeworms were found in island fox (Urocyon littoralis; clade A) and coyotes (Canis latrans; clades A and B), at 2 sites in California. In experimental-feeding trials, tetrathyridia ingested by lizards, mice, and dogs resulted in tetrathyridial (lizards and mice) or adult infections (dogs); proglottids and acephalic metacestodes were not infectious to vertebrates. These results support investigating arthropods as a first host of Mesocestoides spp.

ISBN: 0496847597Subjects--Topical Terms:

1017726
Biology, Ecology.

Life cycles and systematics of Mesocestoides spp. tapeworms.
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500 $a Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2748.
500 $a Adviser: Walter M. Boyce.
502 $a Thesis (Ph.D.)--University of California, Davis, 2004.
520 $a This dissertation focuses on the life cycles and systematics of 3 molecular strains of Mesocestoides tapeworms that represent different evolutionary lineages (clades A, B, and C) found in Californian domestic carnivores and wildlife. In Chapter 1, life cycles of Mesocestoides clades A and B were investigated by identifying sylvatic hosts and by conducting experimental feeding trials with immature tapeworm stages (proglottids, tetrathyridia, and acephalic metacestodes). Tetrathyridia (clades A and B) were found in deer mice (Peromyscus maniculatus), and adult tapeworms were found in island fox (Urocyon littoralis; clade A) and coyotes (Canis latrans; clades A and B), at 2 sites in California. In experimental-feeding trials, tetrathyridia ingested by lizards, mice, and dogs resulted in tetrathyridial (lizards and mice) or adult infections (dogs); proglottids and acephalic metacestodes were not infectious to vertebrates. These results support investigating arthropods as a first host of Mesocestoides spp.
520 $a In Chapter 2, ants were examined as possible first intermediate hosts of Mesocestoides tapeworms. A PCR-based diagnostic assay was developed to test pooled samples of ants. Between 2--3% of ants ( Lasius niger and Tapinoma sessile) from an enzootic site on San Miguel Island, Channel Islands National Park (SMI) were positive for Mesocestoides DNA; sequences were identical to clade A from definitive hosts at SMI. Nevertheless, deer mice failed to develop Mesocestoides infections after ingesting SMI ants.
520 $a In Chapter 3 a hypothesis-based framework was used to test whether Mesocestoides clades A, B, and C are distinct evolutionary lineages, thereby supporting classification as species. As a control, 3 other cestode species, Taenia pisiformis, T. serialis, and T. crassiceps were assessed. Using sequence data from mitochondrial rDNA (12S) and nuclear rDNA (ITS-2), derived (autapomorphic) characters were found for clades A, B, and C and T. pisiformis and T. serialis . Furthermore, multivariate analysis on morphological characters revealed significant differences among the 3 Mesocestoides clades and between T. pisiformis and T. serialis . The extent of phenotypic variation of Mesocestoides and Taenia tapeworms was similar. Results from this study support classifying Mesocestoides clades A, B, and C as separate species, and supports clade B and M. vogae as conspecific.
590 $a School code: 0029.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Veterinary Science. $3 1021733
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