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Effects of Calendar Time, Temperatur...

Grebeldinger, Erika M.

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Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age./
作者:	Grebeldinger, Erika M.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	70 p.
附註:	Source: Masters Abstracts International, Volume: 55-04.
Contained By:	Masters Abstracts International55-04(E).
標題:	Aquatic sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10037651
ISBN:	9781339548357

Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age.
Grebeldinger, Erika M.

Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 70 p.

Source: Masters Abstracts International, Volume: 55-04.

Thesis (M.S.)--Royal Roads University (Canada), 2016.

Forage fish species are essential to global marine ecosystems as conduits of energy transfer from low to high trophic levels. Pacific herring (Clupea pallasii) are an important forage fish species in northeast Pacific marine and estuarine ecosystems. Pacific herring length-at-age (LaA, mm) has declined markedly over the past several decades in California and British Columbia (BC) regions thereby influencing physiological processes and biological interactions. Assessing variability in herring LaA is relevant to population and ecosystem studies in addition to sustainable fisheries management and informing fisheries policy. In this study, herring LaA for north coast BC, south coast BC and California (San Francisco Bay) populations were used to estimate how much of the variation is explained by time (year, calendar time), sea surface temperature (°C), and growing degree-day (a metric combining sea surface temperature and calendar time, GDD, °C&dot;day). Time (year) explains more of the interannual variability in herring LaA compared to sea surface temperature and the GDD metric. In addition, a complete removal of older age classes was evident for all areas, suggesting that factors other than those assessed in this study have influenced herring LaA.

ISBN: 9781339548357Subjects--Topical Terms:

3174300
Aquatic sciences.

Effects of Calendar Time, Temperature and Growing Degree-Day on Pacific Herring (Clupea pallasii) Length-at-Age.
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520 $a Forage fish species are essential to global marine ecosystems as conduits of energy transfer from low to high trophic levels. Pacific herring (Clupea pallasii) are an important forage fish species in northeast Pacific marine and estuarine ecosystems. Pacific herring length-at-age (LaA, mm) has declined markedly over the past several decades in California and British Columbia (BC) regions thereby influencing physiological processes and biological interactions. Assessing variability in herring LaA is relevant to population and ecosystem studies in addition to sustainable fisheries management and informing fisheries policy. In this study, herring LaA for north coast BC, south coast BC and California (San Francisco Bay) populations were used to estimate how much of the variation is explained by time (year, calendar time), sea surface temperature (°C), and growing degree-day (a metric combining sea surface temperature and calendar time, GDD, °C&dot;day). Time (year) explains more of the interannual variability in herring LaA compared to sea surface temperature and the GDD metric. In addition, a complete removal of older age classes was evident for all areas, suggesting that factors other than those assessed in this study have influenced herring LaA.
520 $a The results of this research suggest that future studies should focus on modeling multiple factors that may influence variability in herring LaA such as ocean regime shifts influencing prey quality and quantity, environmental pressures (e.g., seawater temperature), and impacts from size-selective fishing that may affect population recovery of this species.
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