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The Spatial Ecology of Macroinverteb...

Currinder, Bryan Timothy,

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The Spatial Ecology of Macroinvertebrates in Sierra Nevada Lakes and Ponds /

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Spatial Ecology of Macroinvertebrates in Sierra Nevada Lakes and Ponds // Bryan Timothy Currinder.
Author:	Currinder, Bryan Timothy,
Description:	1 electronic resource (151 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
Contained By:	Dissertations Abstracts International86-11B.
Subject:	Ecology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31847625
ISBN:	9798314858462

The Spatial Ecology of Macroinvertebrates in Sierra Nevada Lakes and Ponds /
Currinder, Bryan Timothy,

The Spatial Ecology of Macroinvertebrates in Sierra Nevada Lakes and Ponds /Bryan Timothy Currinder. - 1 electronic resource (151 pages)

Source: Dissertations Abstracts International, Volume: 86-11, Section: B.

Determining the factors that drive patterns of diversity across space and time is a major goal of ecology. Mountain lakes and ponds are uniquely suited for testing how environmental gradients shape the spatial and temporal patterns of population and community diversity. Additionally, mountains contain steep climate gradients and highly variable local contexts, both of which are likely to mediate how communities respond to climate warming. In this dissertation, I used a suite of theoretical and empirical frameworks to understand the factors shaping spatial patterns of population genetic diversity, patterns of community assembly among lakes and ponds, and community responses to a rapidly changing climate. For all chapters, the Sierra Nevada mountains of California served as the natural laboratory, while both historical and contemporary collections of littoral macroinvertebrates served as the subjects.In Chapter 1, I used a common lentic mayfly species (Callibaetis ferrugineus hageni) to explore how spatial patterns of genetic and genomic variation are influenced by the interaction of steep climate gradients, the landscape matrix, and local environmental quality. By using a combination of landscape genetic network models and genomic tools, I found that both at-site and among-site factors influence patterns of gene flow among lakes, while higher elevation populations showed enhanced signatures of local adaptation. Taken together, landscape-restricted gene flow likely allows for selection pressures to facilitate local adaptation in the mayfly populations of higher elevation lakes. In Chapter 2, I used a historical dataset of macroinvertebrates to understand how daily and seasonal temperature variation influence community assembly in lakes versus ponds. Relative to lakes, I found that ponds filter for taxa with wider thermal tolerance, which then constrains the diversity of functional traits in pond communities. My results also suggest that daily temperature variation may be a particularly important abiotic filter for pond communities, though future incorporation of in situ data will help confirm the relative roles of daily, seasonal, and interannual climate variation across categories of ecosystem size. In Chapter 3, I used both historical and contemporary datasets of lake macroinvertebrates to ask 1) if lake communities are responding to climate warming through colonizations by warm-adapted taxa, local extinctions of cold-adapted taxa, or both (i.e. thermophilization) and 2) if current responses to climate warming result in reduced beta diversity (i.e. homogenization). Over 20 years of declining winter snowpack and rising air temperatures, I found that colonizations by predators drove thermophilization in contemporary macroinvertebrate communities, but that thermophilization did not lead to significant homogenization in either taxonomic or functional measures.Collectively, my dissertation demonstrates the unique ways in which mountain environments shape freshwater populations and communities, while also mediating community responses to rapid climate warming.

English

ISBN: 9798314858462Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Lakes

The Spatial Ecology of Macroinvertebrates in Sierra Nevada Lakes and Ponds /
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520 $a Determining the factors that drive patterns of diversity across space and time is a major goal of ecology. Mountain lakes and ponds are uniquely suited for testing how environmental gradients shape the spatial and temporal patterns of population and community diversity. Additionally, mountains contain steep climate gradients and highly variable local contexts, both of which are likely to mediate how communities respond to climate warming. In this dissertation, I used a suite of theoretical and empirical frameworks to understand the factors shaping spatial patterns of population genetic diversity, patterns of community assembly among lakes and ponds, and community responses to a rapidly changing climate. For all chapters, the Sierra Nevada mountains of California served as the natural laboratory, while both historical and contemporary collections of littoral macroinvertebrates served as the subjects.In Chapter 1, I used a common lentic mayfly species (Callibaetis ferrugineus hageni) to explore how spatial patterns of genetic and genomic variation are influenced by the interaction of steep climate gradients, the landscape matrix, and local environmental quality. By using a combination of landscape genetic network models and genomic tools, I found that both at-site and among-site factors influence patterns of gene flow among lakes, while higher elevation populations showed enhanced signatures of local adaptation. Taken together, landscape-restricted gene flow likely allows for selection pressures to facilitate local adaptation in the mayfly populations of higher elevation lakes. In Chapter 2, I used a historical dataset of macroinvertebrates to understand how daily and seasonal temperature variation influence community assembly in lakes versus ponds. Relative to lakes, I found that ponds filter for taxa with wider thermal tolerance, which then constrains the diversity of functional traits in pond communities. My results also suggest that daily temperature variation may be a particularly important abiotic filter for pond communities, though future incorporation of in situ data will help confirm the relative roles of daily, seasonal, and interannual climate variation across categories of ecosystem size. In Chapter 3, I used both historical and contemporary datasets of lake macroinvertebrates to ask 1) if lake communities are responding to climate warming through colonizations by warm-adapted taxa, local extinctions of cold-adapted taxa, or both (i.e. thermophilization) and 2) if current responses to climate warming result in reduced beta diversity (i.e. homogenization). Over 20 years of declining winter snowpack and rising air temperatures, I found that colonizations by predators drove thermophilization in contemporary macroinvertebrate communities, but that thermophilization did not lead to significant homogenization in either taxonomic or functional measures.Collectively, my dissertation demonstrates the unique ways in which mountain environments shape freshwater populations and communities, while also mediating community responses to rapid climate warming.
546 $a English
590 $a School code: 0029
650 4 $a Ecology. $3 516476
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Entomology. $3 615844
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Lakes
653 $a Macroinvertebrates
653 $a Mountains
653 $a Ponds
653 $a Temperature
690 $a 0329
690 $a 0792
690 $a 0353
690 $a 0404
710 2 $a University of California, Davis. $b Ecology. $e degree granting institution. $3 3815800
720 1 $a Sadro, Steven $e degree supervisor.
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791 $a Ph.D.
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856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31847625