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Long-term changes in population stat...

Davis-Foust, Shannon L.

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Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation./
作者:	Davis-Foust, Shannon L.
面頁冊數:	126 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
Contained By:	Dissertation Abstracts International74-03B(E).
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3533211
ISBN:	9781267769855

Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation.
Davis-Foust, Shannon L.

Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation. - 126 p.

Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Milwaukee, 2012.

Estimating fish population statistics such as mortality and survival requires the use of fish age data, so it is important that age determinations are accurate. Scales have traditionally, and erroneously, been used to determine age in freshwater drum (Aplodinotus grunniens) in the majority of past studies. I used bomb radiocarbon dating to validate that sagittal otoliths of drum are the only accurate structure (versus spines or scales) for age determinations. Drum grow slower and live longer than previously recognized by scale reading.

ISBN: 9781267769855Subjects--Topical Terms:

1017726
Biology, Ecology.

Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation.
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245 1 0 $a Long-term changes in population statistics of freshwater drum (Aplodinotus grunniens) in Lake Winnebago, Wisconsin, using otolith growth chronologies and bomb radiocarbon age validation.
300 $a 126 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
500 $a Adviser: Rebecca Klaper.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Milwaukee, 2012.
520 $a Estimating fish population statistics such as mortality and survival requires the use of fish age data, so it is important that age determinations are accurate. Scales have traditionally, and erroneously, been used to determine age in freshwater drum (Aplodinotus grunniens) in the majority of past studies. I used bomb radiocarbon dating to validate that sagittal otoliths of drum are the only accurate structure (versus spines or scales) for age determinations. Drum grow slower and live longer than previously recognized by scale reading.
520 $a Drum otoliths can be used not only to determine age, but also to estimate body length. I examined archaeological drum otoliths dated to the 1830's and older from around the Winnebago system. Maximum body length attained by modern drum had not significantly changed over time; however, longevity is reduced and growth rates have increased in modem drum. The changes in these demographic statistics could be due to several environmental factors that have changed in the Lake Winnebago system since European settlement, and in particular the effects from the removal trawling program that removed large quantities of drum annually from 1936 to 1990.
520 $a Disentangling growth responses to environmental factors such as climate and trophic interactions is a major goal of ecology. Annual growth rates measured from otoliths have frequently been reported to correspond to temperature, but not to food abundance. I constructed growth chronologies of drum using a linear mixed model that separates endogenous and exogenous growth effects. Diet analysis of drum revealed an adult length-related diet shift. The growth rates of large drum from 2001 to 2008 were significantly greater than small drum, which coincided with the arrival of zebra mussels (Dreissena polymorpha) in the Lake Winnebago system. The increase in growth rates of large drum were positively correlated to, but departed from, regional temperatures compared to small drum. The increased growth rates of large drum post zebra mussel establishment were corroborated by improved in body condition of large drum. Zebra mussels provide a significant source of nutrition to drum, which is unique because most effects of dreissenids are reported at lower trophic levels.
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