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Geochemical Variation in the Muscle ...

Chandler, Scott,

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Geochemical Variation in the Muscle of Aleutian Steller Sea Lion Prey /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Geochemical Variation in the Muscle of Aleutian Steller Sea Lion Prey // Scott Chandler.
作者:	Chandler, Scott,
面頁冊數:	1 electronic resource (129 pages)
附註:	Source: Masters Abstracts International, Volume: 85-11.
Contained By:	Masters Abstracts International85-11.
標題:	Ecology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30995656
ISBN:	9798382324555

Geochemical Variation in the Muscle of Aleutian Steller Sea Lion Prey /
Chandler, Scott,

Geochemical Variation in the Muscle of Aleutian Steller Sea Lion Prey /Scott Chandler. - 1 electronic resource (129 pages)

Source: Masters Abstracts International, Volume: 85-11.

Body tissue chemistry has been extensively utilized as biomarkers about the cryptic life histories of Steller sea lions (Eumetopias jubatus) in the western and central Aleutian Islands, Alaska, specifically tissue total mercury concentrations and stable isotope ratios of carbon and nitrogen. As patterns in these biomarkers can be associated with either trophic dynamics or environmental conditions, I examined spatiotemporal and biological variability of bulk carbon and nitrogen stable isotope ratios and total mercury concentrations in the muscle tissue of ten fishes and two cephalopods found in Steller sea lion diets. I hypothesized that the complex bathymetry and oceanography of the region associated with deep-water "oceanic passes" separating islands may limit movement of these species between island groups, compartmentalizing communities in a manner to create distinct geochemical groups. In my first chapter, I found that several oceanic passes act as break points in an east to west decrease in carbon and nitrogen stable isotope ratios in most species sampled, suggesting island groups of the Aleutian Islands have distinct environmental baseline chemistry and/or primary production dynamics. In my second chapter, I found that total mercury concentrations in muscle tissues decrease with distance from the Rat Island group. When this spatial variation was accounted for and species were grouped by feeding guild, benthic invertebrate consumers had the highest mercury concentrations, followed by piscivores and then zooplankton consumers. Multiple species-specific relationships between length and each of these trophic biomarkers provided additional insight into trophic dynamics of these prey species in addition to spatial variation. Considered together, trophic biomarker patterns in Steller sea lion prey suggest trophic networks in the Aleutian Islands are spatially compartmentalized, and variation in sea lion tissue biochemistry will depend on where and what they forage upon in remarkably nuanced manners.

English

ISBN: 9798382324555Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Biogeochemistry

Geochemical Variation in the Muscle of Aleutian Steller Sea Lion Prey /
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520 $a Body tissue chemistry has been extensively utilized as biomarkers about the cryptic life histories of Steller sea lions (Eumetopias jubatus) in the western and central Aleutian Islands, Alaska, specifically tissue total mercury concentrations and stable isotope ratios of carbon and nitrogen. As patterns in these biomarkers can be associated with either trophic dynamics or environmental conditions, I examined spatiotemporal and biological variability of bulk carbon and nitrogen stable isotope ratios and total mercury concentrations in the muscle tissue of ten fishes and two cephalopods found in Steller sea lion diets. I hypothesized that the complex bathymetry and oceanography of the region associated with deep-water "oceanic passes" separating islands may limit movement of these species between island groups, compartmentalizing communities in a manner to create distinct geochemical groups. In my first chapter, I found that several oceanic passes act as break points in an east to west decrease in carbon and nitrogen stable isotope ratios in most species sampled, suggesting island groups of the Aleutian Islands have distinct environmental baseline chemistry and/or primary production dynamics. In my second chapter, I found that total mercury concentrations in muscle tissues decrease with distance from the Rat Island group. When this spatial variation was accounted for and species were grouped by feeding guild, benthic invertebrate consumers had the highest mercury concentrations, followed by piscivores and then zooplankton consumers. Multiple species-specific relationships between length and each of these trophic biomarkers provided additional insight into trophic dynamics of these prey species in addition to spatial variation. Considered together, trophic biomarker patterns in Steller sea lion prey suggest trophic networks in the Aleutian Islands are spatially compartmentalized, and variation in sea lion tissue biochemistry will depend on where and what they forage upon in remarkably nuanced manners.
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650 4 $a Aquatic sciences. $3 3174300
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653 $a Mercury
653 $a Quantitative ecology
653 $a Stable isotope
653 $a Trophic ecology
653 $a Wildlife
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