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Geochemical markers in the otoliths ...

Weber, Peter Kilian.

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Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California./
作者:	Weber, Peter Kilian.
面頁冊數:	123 p.
附註:	Chair: B. Lynn Ingram.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063592
ISBN:	0493825347

Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California.
Weber, Peter Kilian.

Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California. - 123 p.

Chair: B. Lynn Ingram.

Thesis (Ph.D.)--University of California, Berkeley, 2002.

The purpose of this research is to develop geochemical tracer in otoliths for the reconstruction of fish life history in freshwater systems. In Chapter l, otolith <super>87</super>Sr/<super>86</super>Sr for juvenile salmon is shown to reflect the <super>87</super>Sr/<super>86</super>Sr signal for the location where the fish spent the majority of its life. However, for hatchery fish, there is a significant systematic offset in otolith <super>87</super>Sr/<super> 86</super>Sr relative to water <super>87</super>Sr/<super>86</super>Sr that is consistent with approximately 30 percent of otolith Sr coming from the hatchery feed, which is composed primarily of marine fish meal (<super>87 </super>Sr/<super>86</super>Srfeed = <super>87</super>Sr/<super> 86</super>Srmarine = 0.7092 at all sites). Therefore, it is necessary to distinguish between otolith material deposited while in captivity, as oppose to in the wild, to interpret the otolith <super>87</super>Sr/<super>86</super>Sr signal.

ISBN: 0493825347Subjects--Topical Terms:

545717
Biogeochemistry.

Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California.
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245 1 0 $a Geochemical markers in the otoliths of chinook salmon in the Sacramento-San Joaquin River system, California.
300 $a 123 p.
500 $a Chair: B. Lynn Ingram.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4090.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2002.
520 $a The purpose of this research is to develop geochemical tracer in otoliths for the reconstruction of fish life history in freshwater systems. In Chapter l, otolith <super>87</super>Sr/<super>86</super>Sr for juvenile salmon is shown to reflect the <super>87</super>Sr/<super>86</super>Sr signal for the location where the fish spent the majority of its life. However, for hatchery fish, there is a significant systematic offset in otolith <super>87</super>Sr/<super> 86</super>Sr relative to water <super>87</super>Sr/<super>86</super>Sr that is consistent with approximately 30 percent of otolith Sr coming from the hatchery feed, which is composed primarily of marine fish meal (<super>87 </super>Sr/<super>86</super>Srfeed = <super>87</super>Sr/<super> 86</super>Srmarine = 0.7092 at all sites). Therefore, it is necessary to distinguish between otolith material deposited while in captivity, as oppose to in the wild, to interpret the otolith <super>87</super>Sr/<super>86</super>Sr signal.
520 $a Chapter 2 presents a new ion microprobe method for reconstructing the dietary sulfur isotope history of a fish using the otolith. This method can distinguish between otolith material deposited while in captivity, as oppose to in the wild, based on the large difference in sulfur isotopic composition between hatchery and freshwater diets. This method allows otolith <super> 87</super>Sr/<super>86</super>Sr to be correctly interpreted. The otolith sulfur isotope chronology that this technique generates also has broader applications to understanding fish ecology and movement.
520 $a Chapter 3 presents a new ion microprobe method for making spatially-resolved, high-precision <super>87</super>Sr/<super>86</super>Sr analyses in otoliths and other carbonates with moderate Sr concentrations. Such a method is necessary to deconvolve the time-averaged otolith <super>87</super>Sr/<super>86</super>Sr signal for fish that have been away from their natal location for an unknown period of time. The SHRIMP-RG is shown to have sub-permil measurement precision with repeated analyses. Spatial resolution is approximately 20 μm, translating to approximately one week in temporal resolution in juvenile chinook salmon otoliths.
520 $a Chapter 4 demonstrates that three geochemical markers (<super>87</super>Sr/<super> 86</super>Sr, Sr/Ca and Ba/Ca) provide nearly 100 percent site discrimination for 8 of the 10 rivers in this study, and they also discriminate two sites in the Sacramento-San Joaquin River Delta, based on analyzed water samples. This chapter does not include otolith data. The variability of these watershed markers relative to differences between sites is smallest for the <super> 87</super>Sr/<super>86</super>Sr signal.
590 $a School code: 0028.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Zoology. $3 1018632
650 4 $a Geochemistry. $3 539092
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710 2 0 $a University of California, Berkeley. $3 687832
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791 $a Ph.D.
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