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Host use and foraging in the parasit...

The University of Arizona.

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Host use and foraging in the parasitic plant Cuscuta subinclusa.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Host use and foraging in the parasitic plant Cuscuta subinclusa./
作者:	Kelly, Colleen Kay.
面頁冊數:	102 p.
附註:	Director: James H. Brown.
Contained By:	Dissertation Abstracts International50-01B.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8905795

Host use and foraging in the parasitic plant Cuscuta subinclusa.
Kelly, Colleen Kay.

Host use and foraging in the parasitic plant Cuscuta subinclusa. - 102 p.

Director: James H. Brown.

Thesis (Ph.D.)--The University of Arizona, 1988.

Foraging theory predicts active responses by organisms upon encounter with a resource, as opposed to the passive responses of differential survivorship and growth. Stems of the parasitic plant Cuscuta subinclusa invest in resource acquisition (coil) relative to host quality in a way predicted by the marginal value theorem (MVT) in that: (1) stem coiling, the necessary antecedent and determinant of resource uptake, precedes exploitation of host materials; and (2) mean coiling on a host species is proportional to: (a) mean growth/haustorium, (b) mean biomass accumulation over the season, and (c) mean parasite growth/host individual. Coiling is correlated with growth/host individual for the 5 native host species examined, but not when a non-native species is added to the model, suggesting coiling response is a result of natural selection. Preliminary evidence indicates that coiling in C. subinclusa is induced by host bark chemicals. Resource-poor stems of C. subinclusa are more likely to coil, and coil more, than resource-rich stems, thus nutritional state of the parasite as well as host value affects foraging responses.Subjects--Topical Terms:

1017825
Biology, Botany.

Host use and foraging in the parasitic plant Cuscuta subinclusa.
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245 1 0 $a Host use and foraging in the parasitic plant Cuscuta subinclusa.
300 $a 102 p.
500 $a Director: James H. Brown.
500 $a Source: Dissertation Abstracts International, Volume: 50-01, Section: B, page: 0044.
502 $a Thesis (Ph.D.)--The University of Arizona, 1988.
520 $a Foraging theory predicts active responses by organisms upon encounter with a resource, as opposed to the passive responses of differential survivorship and growth. Stems of the parasitic plant Cuscuta subinclusa invest in resource acquisition (coil) relative to host quality in a way predicted by the marginal value theorem (MVT) in that: (1) stem coiling, the necessary antecedent and determinant of resource uptake, precedes exploitation of host materials; and (2) mean coiling on a host species is proportional to: (a) mean growth/haustorium, (b) mean biomass accumulation over the season, and (c) mean parasite growth/host individual. Coiling is correlated with growth/host individual for the 5 native host species examined, but not when a non-native species is added to the model, suggesting coiling response is a result of natural selection. Preliminary evidence indicates that coiling in C. subinclusa is induced by host bark chemicals. Resource-poor stems of C. subinclusa are more likely to coil, and coil more, than resource-rich stems, thus nutritional state of the parasite as well as host value affects foraging responses.
520 $a Evidence from other experiments suggests that the costs of growth, or "search costs", may affect host acceptability. When water is readily available, transplanted C. subinclusa stems are less likely to coil on branches of Platanus racemosa. During the dry season, when cellular expansion is difficult, all p. racemosa branches were coiled upon.
520 $a Large parasites are more likely to over-winter and set seed a second season, and parasites that start from over-wintered tissue are significantly larger at flowering than are those that have started from seed. Seed set is correlated with parasite size, thus linking foraging response and fitness of the plant.
520 $a C. subinclusa's foraging response does not, however, predict population level patterns of host use. The principal determinant of host use by C. subinclusa is average proximity of a species to Malosma laurina. Parasite individuals infest many host species each season, but initially establish, set most seed, and over-winter only on M. laurina. Individual response of C. subinclusa contributes to the model of host use only after proximity to M. laurina is accounted for, suggesting that mechanisms maximizing exploitation of a host take effect after contact between host and parasite.
590 $a School code: 0009.
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650 4 $a Biology, Ecology. $3 1017726
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710 2 $a The University of Arizona. $3 1017508
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791 $a Ph.D.
792 $a 1988
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