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True Metabolizable Energy and Energe...

Gross, Margaret C.

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True Metabolizable Energy and Energetic Carrying Capacity of Submersed Aquatic Vegetation in Semi-Permanent Marshes of the Upper Midwest.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	True Metabolizable Energy and Energetic Carrying Capacity of Submersed Aquatic Vegetation in Semi-Permanent Marshes of the Upper Midwest./
作者:	Gross, Margaret C.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	115 p.
附註:	Source: Masters Abstracts International, Volume: 80-07.
Contained By:	Masters Abstracts International80-07.
標題:	Wildlife Conservation. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10982491
ISBN:	9780438806337

True Metabolizable Energy and Energetic Carrying Capacity of Submersed Aquatic Vegetation in Semi-Permanent Marshes of the Upper Midwest.
Gross, Margaret C.

True Metabolizable Energy and Energetic Carrying Capacity of Submersed Aquatic Vegetation in Semi-Permanent Marshes of the Upper Midwest. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 115 p.

Source: Masters Abstracts International, Volume: 80-07.

Thesis (M.S.)--Western Illinois University, 2018.

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

Wetlands provide important foraging habitat for waterfowl, but many of the historical wetlands in the United States have been lost during the last two centuries. Wetland loss has led to substantial declines in abundance and diversity of submersed aquatic vegetation (SAV), yet there is a lack of information about the implications of these losses on energetic carrying capacity for waterfowl. Wetland managers and conservation planners estimate energetic carrying capacity using bioenergetics models that incorporate several parameters for energy demand (i.e., population size, stopover duration, and daily energy requirements) and the energy supply (i.e., food densities and energy values). However, few energy values (i.e., true metabolizable energy [TME]) are available for natural wetland foods (e.g., SAV) and SAV biomass estimates are limiting for semi-permanent marshes in the Midwest precluding their energetic contribution to regional carrying capacity estimates. Therefore, I estimated the TME of six common species of SAV for gadwall (Mareca Strepera), a primarily herbivorous dabbling duck common in the Mississippi Flyway. Additionally, I estimated energetic carrying capacity, expressed as energetic use days (EUD), of SAV for 20 wetland sites within the Midwest and evaluated the applicability of a visual rapid assessment technique to predict SAV biomass (kg/ha[dry]) and energy density (EUD/ha). Mean TME (± SE; kcal/g[dry]) varied by SAV species (Myriophyllum spicatum, 0.77 ± 0.32; Elodea Canadensis, 0.70 ± 0.31; Ceratophyllum demersum , 0.55 ± 0.28; Najas guadalupensis, -0.61 ± 0.34; Vallisneria americana, -0.98 ± 0.39; Stuckenia pectinata, -1.07 ± 0.33). Furthermore, females acquired 0.52 kcal/g (± 0.34 kcal/g) more energy from vegetation than males and TME declined 0.20 kcal/g (± 0.16 kcal/g) for every 100 g increase in initial mass. Energy density of SAV (x¯ ± SE = 426 ± 52 EUD/ha) varied by National Wetland Inventory class and had a high degree of annual variation. I also developed a reliable (R2m = 0.43, R2c = 0.47) equation to rapidly index energy density from a visual assessment of SAV species coverage. Metabolizable energy of SAV for gadwall was considerably lower than TME of other waterfowl foods, but several vegetation species provided gadwall with a positive source of digestible energy. Gadwall TME estimates also revealed that closely related dabbling duck species (i.e., mallards [Anas platyrhynchos] and gadwall) assimilate varying amounts of energy from similar food items. Energy density estimates of SAV were generally less than estimates reported from previous studies. Estimates of TME and energetic carrying capacity for SAV will allow conservation planners to more accurately evaluate wetland management practices and refine energetic carrying capacity estimates for wetlands containing aquatic macrophytes.

ISBN: 9780438806337Subjects--Topical Terms:

3433384
Wildlife Conservation.

True Metabolizable Energy and Energetic Carrying Capacity of Submersed Aquatic Vegetation in Semi-Permanent Marshes of the Upper Midwest.
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