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The evolutionary ecology of pteridop...

Greer, Gary Keith.

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The evolutionary ecology of pteridophytes of southern Ohio.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The evolutionary ecology of pteridophytes of southern Ohio./
作者:	Greer, Gary Keith.
面頁冊數:	123 p.
附註:	Source: Dissertation Abstracts International, Volume: 58-11, Section: B, page: 5757.
Contained By:	Dissertation Abstracts International58-11B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9815967
ISBN:	0591671557

The evolutionary ecology of pteridophytes of southern Ohio.
Greer, Gary Keith.

The evolutionary ecology of pteridophytes of southern Ohio. - 123 p.

Source: Dissertation Abstracts International, Volume: 58-11, Section: B, page: 5757.

Thesis (Ph.D.)--Ohio University, 1997.

Four studies were conducted to investigate the ecological context of pteridophyte life histories. Phytosociological and environmental analyses of the pteridophyte community of Stroud's Run State Park in southeastern Ohio were used to evaluate the influences of major environmental gradients on species distribution and community structure. Correlations between species DCA scores and environmental parameters indicate that species, and associations identified using unweighted paired-group means analysis (UPGMA), segregate along an environmental plexus dominated by moisture and soil nitrate.

ISBN: 0591671557Subjects--Topical Terms:

1017726
Biology, Ecology.

The evolutionary ecology of pteridophytes of southern Ohio.
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245 1 4 $a The evolutionary ecology of pteridophytes of southern Ohio.
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500 $a Source: Dissertation Abstracts International, Volume: 58-11, Section: B, page: 5757.
500 $a Director: Brian C. McCarthy.
502 $a Thesis (Ph.D.)--Ohio University, 1997.
520 $a Four studies were conducted to investigate the ecological context of pteridophyte life histories. Phytosociological and environmental analyses of the pteridophyte community of Stroud's Run State Park in southeastern Ohio were used to evaluate the influences of major environmental gradients on species distribution and community structure. Correlations between species DCA scores and environmental parameters indicate that species, and associations identified using unweighted paired-group means analysis (UPGMA), segregate along an environmental plexus dominated by moisture and soil nitrate.
520 $a An experiment using the gametophytes of four species of homosporous ferns tested the hypothesis that plasticity of life history traits is greater among species with broad ecological distributions (BD) than among species with narrow ecological distributions (ND). Results failed to support the "ecological breadth" hypothesis. Changes in reproductive effort (i.e., gametangia/mm $\ sp2 $) across four soil treatments indicate that Asplenium rhizophyllum (ND), Diplazium pycnocarpon (ND), and Polystichum acrostichoides (BD), exhibited similar amounts and directions of plasticity; Asplenium platyneuron (BD) exhibited less plasticity.
520 $a Patterns of growth and reproduction were documented in a natural sporophyte population of P. acrostichoides to develop precise hypotheses regarding the life history of this long-lived phase of the fern life cycle. Regression analyses indicated a minimum size threshold exists at which this species becomes reproductive, and that reproductive effort remained constant with increasing plant biomass. Two costs of reproduction were apparent, (1) above-ground growth rate decreased with increasing reproductive effort, and (2) above-ground growth rate increased during non-reproductive years among individuals that reproduced in only one of the two years of the study. These observations suggest reproduction in P. acrostichoides occurs when resources are sufficient to offset it's cost to future growth.
520 $a A soil substrate was used to examine the horizontal range of antheridiogen effects on the gender and morphology structure of gametophyte populations of P. acrostichoides. In general, patterns of gender and morphology were consistent with known antheridiogen effects, however, an unexpected peak in meristic-males at the periphery of the antheridiogen neighborhood was observed. Hypotheses regarding fitness throughout an antheridiogen neighborhood and the adaptive value of antheridiogen and the cause of the unexpected peak in meristic-males are discussed.
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650 4 $a Biology, Botany. $3 1017825
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710 2 0 $a Ohio University. $3 626637
773 0 $t Dissertation Abstracts International $g 58-11B.
790 1 0 $a McCarthy, Brian C., $e advisor
790 $a 0167
791 $a Ph.D.
792 $a 1997
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