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Incorporating Ecological Heterogeneity and Intraspecific Variation to Understand Apex Predator Trophic Ecology.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Incorporating Ecological Heterogeneity and Intraspecific Variation to Understand Apex Predator Trophic Ecology./
Author:	Rosinski, Caroline L.
Description:	1 online resource (114 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-11.
Contained By:	Masters Abstracts International84-11.
Subject:	Ecology. -
Online resource:	click for full text (PQDT)
ISBN:	9798379562243

Incorporating Ecological Heterogeneity and Intraspecific Variation to Understand Apex Predator Trophic Ecology.
Rosinski, Caroline L.

Incorporating Ecological Heterogeneity and Intraspecific Variation to Understand Apex Predator Trophic Ecology. - 1 online resource (114 pages)

Source: Masters Abstracts International, Volume: 84-11.

Thesis (M.S.)--University of Wyoming, 2023.

Includes bibliographical references

Ecological heterogeneity can impact how energy flows from the base of the food web to top predators. In aquatic systems, apex predators are often highly mobile piscivorous fishes with the ability to respond to environmental change by modifying resource use to exploit multiple energy pathways. Further, the exploitation of pathways may be different among individuals, leading to intraspecific variation. I first tested for the presence of intraspecific variation in the apex fish predator, Lake Trout Salvelinus namaycush, in a 390 ha oligotrophic lake with two distinct basins. Differences in stomach contents, stable isotope niche space, and growth rates indicated that there is intraspecific variation across three habitats in this system; the upper basin pelagic, lower basin pelagic, and lower basin benthic habitats. I tested the effects of incorporating this variation and corresponding ecological heterogeneity (e.g., different temperatures, habitat-specific population sizes) on consumption estimates of kokanee (lacustrine Sockeye Salmon, Oncorhynchus nerka) derived from bioenergetics models. I assessed two bioenergetics modeling approaches; one lake-wide model, and one ecologically partitioned model that accounted for differences in Lake Trout diet compositions, growth, and population sizes across habitats. The ecologically partitioned model produced kokanee consumption estimates 30% lower than the lake-wide, unpartitioned model, which produced an estimate that exceeded the number of kokanee stocked in the system. Incorporating ecological heterogeneity and intraspecific variation into these bioenergetic models yielded valuable insights on the foraging patterns of a top predator across habitats. This more nuanced understanding of foraging dynamics could provide critical information to guide multispecies fisheries management by clarifying how managed species interact and in which habitats those interactions create management challenges.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379562243Subjects--Topical Terms:

575279
Ecology.
Subjects--Index Terms:

Bioenergetics modelIndex Terms--Genre/Form:

554714
Electronic books.

Incorporating Ecological Heterogeneity and Intraspecific Variation to Understand Apex Predator Trophic Ecology.
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520 $a Ecological heterogeneity can impact how energy flows from the base of the food web to top predators. In aquatic systems, apex predators are often highly mobile piscivorous fishes with the ability to respond to environmental change by modifying resource use to exploit multiple energy pathways. Further, the exploitation of pathways may be different among individuals, leading to intraspecific variation. I first tested for the presence of intraspecific variation in the apex fish predator, Lake Trout Salvelinus namaycush, in a 390 ha oligotrophic lake with two distinct basins. Differences in stomach contents, stable isotope niche space, and growth rates indicated that there is intraspecific variation across three habitats in this system; the upper basin pelagic, lower basin pelagic, and lower basin benthic habitats. I tested the effects of incorporating this variation and corresponding ecological heterogeneity (e.g., different temperatures, habitat-specific population sizes) on consumption estimates of kokanee (lacustrine Sockeye Salmon, Oncorhynchus nerka) derived from bioenergetics models. I assessed two bioenergetics modeling approaches; one lake-wide model, and one ecologically partitioned model that accounted for differences in Lake Trout diet compositions, growth, and population sizes across habitats. The ecologically partitioned model produced kokanee consumption estimates 30% lower than the lake-wide, unpartitioned model, which produced an estimate that exceeded the number of kokanee stocked in the system. Incorporating ecological heterogeneity and intraspecific variation into these bioenergetic models yielded valuable insights on the foraging patterns of a top predator across habitats. This more nuanced understanding of foraging dynamics could provide critical information to guide multispecies fisheries management by clarifying how managed species interact and in which habitats those interactions create management challenges.
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653 $a Ecology
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