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Variation in the early life history ...

Abrey, Caryn A.

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Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity./
作者:	Abrey, Caryn A.
面頁冊數:	94 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0669.
Contained By:	Dissertation Abstracts International66-02B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3163367
ISBN:	0496975544

Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity.
Abrey, Caryn A.

Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity. - 94 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0669.

Thesis (Ph.D.)--University of Washington, 2005.

Juvenile sockeye salmon (Oncorhynchus nerka) typically exhibit an extended period of lacustrine growth prior to their migration to salt water, and yet little is known about variation in the early life history traits among sympatric populations or the long-term implications of this period on growth and survival. In Lake Aleknagik, Alaska, neighboring sockeye salmon populations have evolved distinctly different peak dates of fry emergence. Among all populations, emergence extended over at least six weeks. This diversity may be a response to high interannual variation in environmental conditions, leading to the lack of a predictable optimal emergence period. In general, sockeye salmon fry emerged prior to peak prey abundance in the lake, suggesting a tendency to maximize the available growing period before the onset of winter.

ISBN: 0496975544Subjects--Topical Terms:

1017726
Biology, Ecology.

Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity.
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245 1 0 $a Variation in the early life history of sockeye salmon (Oncorhynchus nerka): Emergence timing, an ontogenetic shift, and population productivity.
300 $a 94 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0669.
500 $a Adviser: Thomas P. Quinn.
502 $a Thesis (Ph.D.)--University of Washington, 2005.
520 $a Juvenile sockeye salmon (Oncorhynchus nerka) typically exhibit an extended period of lacustrine growth prior to their migration to salt water, and yet little is known about variation in the early life history traits among sympatric populations or the long-term implications of this period on growth and survival. In Lake Aleknagik, Alaska, neighboring sockeye salmon populations have evolved distinctly different peak dates of fry emergence. Among all populations, emergence extended over at least six weeks. This diversity may be a response to high interannual variation in environmental conditions, leading to the lack of a predictable optimal emergence period. In general, sockeye salmon fry emerged prior to peak prey abundance in the lake, suggesting a tendency to maximize the available growing period before the onset of winter.
520 $a During the first summer of growth, juveniles exhibited an ontogenetic niche shift from the littoral to the pelagic region of the lake and switched their primary prey from aquatic insects to zooplankton. The timing of this shift was driven by offshore habitat conditions (water temperature and zooplankton density), as indicated by path analysis models. This is distinctly different from the pattern of size-mediated ontogenetic shifts observed in more temperate species, suggesting that selective pressure to maximize growth may outweigh predation risk in this high-latitude system.
520 $a Populations characterized by later periods of emergence had greater proportions of offspring spending two years (rather than one) in fresh water. However, there was no difference in mean productivity among the populations and all exhibited highly significant interannual correlations. The date of the ontogenetic shift was strongly correlated with fish length at the end of the first summer of growth and with survival of the age-1 smolts to adulthood. Productivity was not correlated with the length of outmigrating smolts.
520 $a This study provides insight into the primary selective forces driving early life history patterns in a highly productive sockeye salmon system, and the impacts of this period on the long-term growth and survival of these populations. In addition, we gain perspective on the large-scale interactions among the biotic and abiotic components acting within an ecosystem largely unaffected by anthropogenic activities.
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