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Helen F. James
National Museum of Natural History
94Publications
28H-index
2,754Citations
Publications 94
Newest
Published on Mar 1, 2019in Marine Biology 2.21
Anne E. Wiley7
Estimated H-index: 7
(University of Akron),
Sam Rossman7
Estimated H-index: 7
(MSU: Michigan State University)
+ 5 AuthorsHelen F. James28
Estimated H-index: 28
(National Museum of Natural History)
Quantifying individual specialization and other forms of intraspecific ecological diversity can reveal variation that is critical for evolutionary or behavioral adaption of a species to changing environments. Here, the isotopic niche and degree of individual foraging specialization were quantified for an endangered seabird, the Hawaiian petrel (Pterodroma sandwichensis), nesting on Lānaʻi (20°48′N, 156°52′W) and 72 km away on Haleakalā, Maui (20°42′N, 156°15′W; 20° 43′N, 156°14′W) between 2006 a...
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Published on Feb 1, 2019in Oecologia 3.13
Kaycee E. Morra1
Estimated H-index: 1
(MSU: Michigan State University),
Yoshito Chikaraishi30
Estimated H-index: 30
(Hokkaido University)
+ 6 AuthorsPeggy H. Ostrom33
Estimated H-index: 33
(MSU: Michigan State University)
We investigated how foraging habits vary among three ecologically distinct wide-ranging seabirds. Using amino acid δ15N proxies for nutrient regime (δ15NPhe) and trophic position (Δδ15NGlu-Phe), we compared Newell’s shearwater (Puffinus newelli) and Laysan albatross (Phoebastria immutabilis) foraging habits over the past 50–100 years, respectively, to published records for the Hawaiian petrel (Pterodroma sandwichensis). Standard ellipses constructed from the isotope proxies show that inter-popul...
1 Citations Source Cite
Published on Mar 1, 2018in Waterbirds 0.67
Kaycee E. Morra1
Estimated H-index: 1
(MSU: Michigan State University),
Anne E. Wiley7
Estimated H-index: 7
(University of Akron)
+ 2 AuthorsPeggy H. Ostrom33
Estimated H-index: 33
(MSU: Michigan State University)
Abstract. Isotope data from Hawaiian Petrel (Pterodroma sandwichensis) primaries P1 and P6 were compared to determine whether foraging habits change between the beginning and middle of the nonbreeding season. P6 data did not differ between samples derived from a longitudinal and a minimally invasive protocol and point samples taken from the feather bases. While P6 δ13C increased longitudinally, no δ15N longitudinal trends emerged, yet inter-individual δ15N variability was high. P6 δ13C data sugg...
1 Citations Source Cite
Published on Mar 29, 2017
Peggy H. Ostrom33
Estimated H-index: 33
(MSU: Michigan State University),
Anne E. Wiley7
Estimated H-index: 7
(University of Akron)
+ 4 AuthorsYoshito Chikaraishi30
Estimated H-index: 30
(Hokkaido University)
Human-induced ecological change in the open oceans appears to be accelerating. Fisheries, climate change and elevated nutrient inputs are variously blamed, at least in part, for altering oceanic ecosystems. Yet it is challenging to assess the extent of anthropogenic change in the open oceans, where historical records of ecological conditions are sparse, and the geographical scale is immense. We developed millennial-scale amino acid nitrogen isotope records preserved in ancient animal remains to ...
12 Citations Source Cite
Published on Mar 24, 2017
Peggy H. Ostrom33
Estimated H-index: 33
,
Anne E. Wiley7
Estimated H-index: 7
+ 4 AuthorsYoshito Chikaraishi30
Estimated H-index: 30
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Published on Feb 5, 2017in Philosophical Transactions of the Royal Society B 5.67
Masayoshi Tokita15
Estimated H-index: 15
(Harvard University),
Wataru Yano5
Estimated H-index: 5
(Asahi University)
+ 1 AuthorsArhat Abzhanov22
Estimated H-index: 22
(Harvard University)
Adaptive radiation is the rapid evolution of morphologically and ecologically diverse species from a single ancestor. The two classic examples of adaptive radiation are Darwin's finches and the Hawaiian honeycreepers, which evolved remarkable levels of adaptive cranial morphological variation. To gain new insights into the nature of their diversification, we performed comparative three-dimensional geometric morphometric analyses based on X-ray microcomputed tomography (µCT) scanning of dried cra...
16 Citations Source Cite
Published on Jan 1, 2017
Peggy H. Ostrom33
Estimated H-index: 33
,
Anne E. Wiley7
Estimated H-index: 7
+ 4 AuthorsYoshito Chikaraishi30
Estimated H-index: 30
Published on Jan 1, 2017
Anne E. Wiley7
Estimated H-index: 7
,
Helen F. James28
Estimated H-index: 28
,
Peggy H. Ostrom33
Estimated H-index: 33
Published on Jan 1, 2017
Peggy H. Ostrom33
Estimated H-index: 33
,
Anne E. Wiley7
Estimated H-index: 7
+ 4 AuthorsYoshito Chikaraishi30
Estimated H-index: 30
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