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Patterns and dynamics of Vaccinium s...

Stohr, Shannon Nix.

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Patterns and dynamics of Vaccinium spp. phylloplane fungal communities in response to anthropogenic disturbance.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Patterns and dynamics of Vaccinium spp. phylloplane fungal communities in response to anthropogenic disturbance./
Author:	Stohr, Shannon Nix.
Description:	146 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0062.
Contained By:	Dissertation Abstracts International66-01B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3160327
ISBN:	9780496938230

Patterns and dynamics of Vaccinium spp. phylloplane fungal communities in response to anthropogenic disturbance.
Stohr, Shannon Nix.

Patterns and dynamics of Vaccinium spp. phylloplane fungal communities in response to anthropogenic disturbance. - 146 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0062.

Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2005.

The intent of this work was to determine to what extent disturbance was responsible for changes in the structure of phylloplane fungal communities and to evaluate the degree of influence that members of the phyllosphere had on each other's ecology. Two distinct forms of disturbance (fungicide application in commercial cranberry and clear-cutting in tyttebaer) were used to investigate the response of these fungi to disturbance and the community attributes of abundance, richness, evenness and diversity were calculated as indices of relationships between epiphytic, endophytic and pathogenic members of the phylloplane fungal community of American cranberry (Vaccinium macrocarpon) and between the epiphytic and endophytic communities of Tyttebaer (Vaccinium vitis-idaea). Spatially, changes in phylloplane community structure were evaluated at the scale of plant assemblages under different intensities of management and temporally over the period of several months to years. Also, in vitro experimental manipulations of phylloplane epiphytic fungal diversity and density were conducted in an attempt to gain understanding of how multiple competitors affect fungal growth and development. Several hypotheses were developed that allowed the testing of relevant and topical ecological theory in the context of microbial community dynamics and structure. As a consequence of this work, we discovered that phylloplane fungal community attributes change over time and with management treatment, often significantly; that epiphyte diversity did not significantly influence pathogen abundance; that in support of and expanding upon Connell's (1978) Intermediate Disturbance Hypothesis, when intensity of agricultural management was intermediate, pathogen abundance was greatest and was least when management was absent or very intense; that greater fungal diversity did not negatively affect the ability of a selected competitor to coexist by suppressing or inhibiting its growth and that as antagonist spore density increased, the recovery of a selected competitor correspondingly decreased, with the least recovery occurring when antagonist spore density was the greatest. It is hoped that the discoveries presented here further progress the knowledge and understanding of this unique but often neglected ecological discipline.

ISBN: 9780496938230Subjects--Topical Terms:

1017726
Biology, Ecology.

Patterns and dynamics of Vaccinium spp. phylloplane fungal communities in response to anthropogenic disturbance.
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520 $a The intent of this work was to determine to what extent disturbance was responsible for changes in the structure of phylloplane fungal communities and to evaluate the degree of influence that members of the phyllosphere had on each other's ecology. Two distinct forms of disturbance (fungicide application in commercial cranberry and clear-cutting in tyttebaer) were used to investigate the response of these fungi to disturbance and the community attributes of abundance, richness, evenness and diversity were calculated as indices of relationships between epiphytic, endophytic and pathogenic members of the phylloplane fungal community of American cranberry (Vaccinium macrocarpon) and between the epiphytic and endophytic communities of Tyttebaer (Vaccinium vitis-idaea). Spatially, changes in phylloplane community structure were evaluated at the scale of plant assemblages under different intensities of management and temporally over the period of several months to years. Also, in vitro experimental manipulations of phylloplane epiphytic fungal diversity and density were conducted in an attempt to gain understanding of how multiple competitors affect fungal growth and development. Several hypotheses were developed that allowed the testing of relevant and topical ecological theory in the context of microbial community dynamics and structure. As a consequence of this work, we discovered that phylloplane fungal community attributes change over time and with management treatment, often significantly; that epiphyte diversity did not significantly influence pathogen abundance; that in support of and expanding upon Connell's (1978) Intermediate Disturbance Hypothesis, when intensity of agricultural management was intermediate, pathogen abundance was greatest and was least when management was absent or very intense; that greater fungal diversity did not negatively affect the ability of a selected competitor to coexist by suppressing or inhibiting its growth and that as antagonist spore density increased, the recovery of a selected competitor correspondingly decreased, with the least recovery occurring when antagonist spore density was the greatest. It is hoped that the discoveries presented here further progress the knowledge and understanding of this unique but often neglected ecological discipline.
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