Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus).
This study found evidence of intermittent, multi-year residency periods in northern fur seals (Callorhinus ursinus) using stable isotope ratios in vibrissae and canine teeth. Northern fur seals migrate from the Bering Sea during summer months to lower latitudes and slightly warmer waters of the nort...
Main Author: | |
---|---|
Format: | Thesis |
Language: | unknown |
Published: |
NSUWorks
2017
|
Subjects: | |
Online Access: | https://nsuworks.nova.edu/occ_stuetd/448 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1450&context=occ_stuetd |
id |
ftnsoutheastern:oai:nsuworks.nova.edu:occ_stuetd-1450 |
---|---|
record_format |
openpolar |
spelling |
ftnsoutheastern:oai:nsuworks.nova.edu:occ_stuetd-1450 2023-05-15T15:43:28+02:00 Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). Foley, Megan 2017-07-28T07:00:00Z application/pdf https://nsuworks.nova.edu/occ_stuetd/448 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1450&context=occ_stuetd unknown NSUWorks https://nsuworks.nova.edu/occ_stuetd/448 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1450&context=occ_stuetd http://creativecommons.org/licenses/by/4.0/ CC-BY HCNSO Student Theses and Dissertations Northern Fur Seal Stable Isotopes Migration δ18O δ13C δ15N Marine Biology Oceanography and Atmospheric Sciences and Meteorology thesis 2017 ftnsoutheastern 2022-04-10T21:55:24Z This study found evidence of intermittent, multi-year residency periods in northern fur seals (Callorhinus ursinus) using stable isotope ratios in vibrissae and canine teeth. Northern fur seals migrate from the Bering Sea during summer months to lower latitudes and slightly warmer waters of the northeastern Pacific Ocean and California Current in the winter. To determine the length of time spent away from the Bering Sea, growth rate was estimated using the covarying oscillations δ13C and δ15N, estimated to be 0.09 mm/day. The δ13C and δ15N in vibrissae from 30 male fur seals showed a minimum of 13 separate periods of stable covariance covering 3.25+ cm, indicating at least 1 year in warmer, less productive waters of the northeastern Pacific Ocean. The vibrissae isotope ratios were used in conjunction with δ18O from tooth dentin growth layer groups of 20 male northern fur seals; they showed significant enrichment in δ18O in 50% of the animals at age 1-2 years, which indicates extended periods of time spent in lower latitudes in the North Pacific Ocean as δ18O is typically enriched in warmer, less productive waters. Significant changes in δ18O were found to be ~ 0.2‰ enrichment per 10º south latitude, while longitude was found to have 0.2‰ enrichment per 50˚ East longitude. These data show that latitudinal changes, those related to the southerly migration from the Bering Sea to the northeastern Pacific Ocean, are a stronger factor in the shifts in dentinal δ18O than longitudinal shifts. These intermittent periods of occupation are important when estimating population abundance of northern fur seals, especially pups and juveniles. Thesis Bering Sea Callorhinus ursinus Northern fur seal Nova Southeastern University: NSU Works Bering Sea Pacific |
institution |
Open Polar |
collection |
Nova Southeastern University: NSU Works |
op_collection_id |
ftnsoutheastern |
language |
unknown |
topic |
Northern Fur Seal Stable Isotopes Migration δ18O δ13C δ15N Marine Biology Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Northern Fur Seal Stable Isotopes Migration δ18O δ13C δ15N Marine Biology Oceanography and Atmospheric Sciences and Meteorology Foley, Megan Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
topic_facet |
Northern Fur Seal Stable Isotopes Migration δ18O δ13C δ15N Marine Biology Oceanography and Atmospheric Sciences and Meteorology |
description |
This study found evidence of intermittent, multi-year residency periods in northern fur seals (Callorhinus ursinus) using stable isotope ratios in vibrissae and canine teeth. Northern fur seals migrate from the Bering Sea during summer months to lower latitudes and slightly warmer waters of the northeastern Pacific Ocean and California Current in the winter. To determine the length of time spent away from the Bering Sea, growth rate was estimated using the covarying oscillations δ13C and δ15N, estimated to be 0.09 mm/day. The δ13C and δ15N in vibrissae from 30 male fur seals showed a minimum of 13 separate periods of stable covariance covering 3.25+ cm, indicating at least 1 year in warmer, less productive waters of the northeastern Pacific Ocean. The vibrissae isotope ratios were used in conjunction with δ18O from tooth dentin growth layer groups of 20 male northern fur seals; they showed significant enrichment in δ18O in 50% of the animals at age 1-2 years, which indicates extended periods of time spent in lower latitudes in the North Pacific Ocean as δ18O is typically enriched in warmer, less productive waters. Significant changes in δ18O were found to be ~ 0.2‰ enrichment per 10º south latitude, while longitude was found to have 0.2‰ enrichment per 50˚ East longitude. These data show that latitudinal changes, those related to the southerly migration from the Bering Sea to the northeastern Pacific Ocean, are a stronger factor in the shifts in dentinal δ18O than longitudinal shifts. These intermittent periods of occupation are important when estimating population abundance of northern fur seals, especially pups and juveniles. |
format |
Thesis |
author |
Foley, Megan |
author_facet |
Foley, Megan |
author_sort |
Foley, Megan |
title |
Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
title_short |
Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
title_full |
Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
title_fullStr |
Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
title_full_unstemmed |
Evidence of Intermittent Residency in the Northern Fur Seal (Callorhinus ursinus). |
title_sort |
evidence of intermittent residency in the northern fur seal (callorhinus ursinus). |
publisher |
NSUWorks |
publishDate |
2017 |
url |
https://nsuworks.nova.edu/occ_stuetd/448 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1450&context=occ_stuetd |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea Callorhinus ursinus Northern fur seal |
genre_facet |
Bering Sea Callorhinus ursinus Northern fur seal |
op_source |
HCNSO Student Theses and Dissertations |
op_relation |
https://nsuworks.nova.edu/occ_stuetd/448 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1450&context=occ_stuetd |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766377608980725760 |