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Food-Web Linkages and Community Dyna...

Ziegler, Shelby L.

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Food-Web Linkages and Community Dynamics Across Biogenic Habitat Boundaries.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Food-Web Linkages and Community Dynamics Across Biogenic Habitat Boundaries./
Author:	Ziegler, Shelby L.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	133 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
Contained By:	Dissertations Abstracts International82-01B.
Subject:	Ecology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27833631
ISBN:	9798641818344

Food-Web Linkages and Community Dynamics Across Biogenic Habitat Boundaries.
Ziegler, Shelby L.

Food-Web Linkages and Community Dynamics Across Biogenic Habitat Boundaries. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 133 p.

Source: Dissertations Abstracts International, Volume: 82-01, Section: B.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2020.

This item must not be sold to any third party vendors.

Many species move within and across diverse habitat mosaics over their lifetime, requiring ecologists to study cross-landscape population dynamics and trophic interactions. Salt marshes are nursery habitats that exist at the interface between terrestrial and aquatic ecosystems connected by tidal fluctuations allowing the movement of both predators and prey across distinct ecological boundaries and therefore are ideal study systems for exploring such dynamics. My dissertation investigates the movement of estuarine nekton across the land-sea interface and the subsequent implications for food webs. I combined a literature synthesis and extensive fieldwork across multiple sites, landscapes, and geographic scales to ask 2 main questions: 1) How does marsh habitat configuration influence estuarine species' abundance and diversity; and 2) How does energy flow from marshes to the estuary vary across geographic scales, and what environmental variables influence patterns of energy flow? In chapter 1, by examining marshes of varying sizes and configurations, I determined marsh size does not affect nekton diversity, yet does influence the density and abundance of nekton utilizing the marsh. To determine how hydrodynamics and plant structure of salt marshes influence predator-prey interactions along the seaward edge of marsh habitat, I used both literature synthesis (Ch 2) and predation experiments (Ch 3). Both studies found that tidal forcing, more than local habitat structure, drives the ability of estuarine predators to access marsh-associated prey. In chapter 4, I utilized stable isotope biomarkers to determine the contribution of marsh primary production for estuarine species across geographic regions. This study found that the reliance of salt marsh primary production for estuarine communities was species and location specific. My results showed that for all species analyzed from the Gulf of Mexico greater than 50% of their diet was comprised of marsh-derived carbon. In contrast, in both the South and Mid-Atlantic regions, diets of taxa were comprised of a diversity of marsh and aquatic basal carbon sources. In sum, this work offers a critically-needed nuanced look at how marsh habitats of varying structure and physical processes function uniquely as nursery habitat and their role in transferring energy from terrestrial systems to enhance estuarine secondary production.

ISBN: 9798641818344Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Energy flow

Food-Web Linkages and Community Dynamics Across Biogenic Habitat Boundaries.
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300 $a 133 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
500 $a Advisor: Fodrie, F. Joel.
502 $a Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Many species move within and across diverse habitat mosaics over their lifetime, requiring ecologists to study cross-landscape population dynamics and trophic interactions. Salt marshes are nursery habitats that exist at the interface between terrestrial and aquatic ecosystems connected by tidal fluctuations allowing the movement of both predators and prey across distinct ecological boundaries and therefore are ideal study systems for exploring such dynamics. My dissertation investigates the movement of estuarine nekton across the land-sea interface and the subsequent implications for food webs. I combined a literature synthesis and extensive fieldwork across multiple sites, landscapes, and geographic scales to ask 2 main questions: 1) How does marsh habitat configuration influence estuarine species' abundance and diversity; and 2) How does energy flow from marshes to the estuary vary across geographic scales, and what environmental variables influence patterns of energy flow? In chapter 1, by examining marshes of varying sizes and configurations, I determined marsh size does not affect nekton diversity, yet does influence the density and abundance of nekton utilizing the marsh. To determine how hydrodynamics and plant structure of salt marshes influence predator-prey interactions along the seaward edge of marsh habitat, I used both literature synthesis (Ch 2) and predation experiments (Ch 3). Both studies found that tidal forcing, more than local habitat structure, drives the ability of estuarine predators to access marsh-associated prey. In chapter 4, I utilized stable isotope biomarkers to determine the contribution of marsh primary production for estuarine species across geographic regions. This study found that the reliance of salt marsh primary production for estuarine communities was species and location specific. My results showed that for all species analyzed from the Gulf of Mexico greater than 50% of their diet was comprised of marsh-derived carbon. In contrast, in both the South and Mid-Atlantic regions, diets of taxa were comprised of a diversity of marsh and aquatic basal carbon sources. In sum, this work offers a critically-needed nuanced look at how marsh habitats of varying structure and physical processes function uniquely as nursery habitat and their role in transferring energy from terrestrial systems to enhance estuarine secondary production.
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