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Maintenance of Diversity through Multiple Timescales of Variation

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Title:Maintenance of Diversity through Multiple Timescales of Variation
Authors:Smith, Alaina
Contributors:Edwards, Kyle (advisor)
Oceanography (department)
Global Environmental Science (department)
Date Issued:2016
Publisher:University of Hawaiʻi at Mānoa
Place of Publication:Honolulu
Abstract:Understanding the maintenance of diversity in phytoplankton is important because
they are the base of the food web and they play a major part in biogeochemical cycles
including the carbon cycle, which affects how the biosphere reacts to climate change.
Diversity can be maintained through resource fluctuation because species can evolve
different strategies to thrive under different conditions. These strategies include being able
to grow the fastest, being able to store the most resources, or being able to use resources
more efficiently, thus being the best competitor under limited resources. Nutrient supply
in the ocean likely varies over multiple time scales (e.g., seasonal variation vs. storms);
however, we do not understand how multiple frequencies of variation affects
phytoplankton communities. To test the role of multiple frequencies of variation, I am
using a model describing how phytoplankton respond to varying nutrient supply. I
compared how the community structure during conditions where there were two pulse
frequencies differ from communities under one-pulse frequency conditions.
Under one-pulse conditions it was reiterated that species with different strategies
did better under competition at different periods. As the pulse periods increased there were
clear shifts in the community structure with respect to the strategies. However, when a
second pulse frequency was added, pulse periods where species with one strategy usually
dominated, were found to contain a co-existence between species with multiple strategies.
In short, it was found that multiple frequencies of resource variation allow for a greater
diversity of strategies present in the community.
Pages/Duration:34 pages
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Rights Holder:Smith, Alaina
Appears in Collections: Global Environmental Science Theses

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