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Coupled changes between the H-Print biomarker and δ15N indicates a variable sea ice carbon contribution to the diet of Cumberland Sound beluga whales.
- Source :
- Limnology & Oceanography; Jul2017, Vol. 62 Issue 4, p1606-1619, 14p
- Publication Year :
- 2017
-
Abstract
- Sub-Arctic habitats are being exposed to increasingly long periods of open water as sea ice continues to decline in thickness and extent. Some hypothesize that this will result in a reduction, and maybe total loss of sea ice derived (sympagic) carbon supply; however, the impact of such change on ecosystems requires further investigation. Here, we used the H-Print biomarker approach that utilizes well-defined indicators of both sympagic and phytoplanktic carbon, in combination with stable isotopes (δ<superscript>15</superscript>N), to study the effect of reducing sympagic carbon availability on beluga whales ( Delphinapterus leucas) in the sub-Arctic ecosystem of Cumberland Sound. Our data show that decreasing δ<superscript>15</superscript>N in belugas was negatively correlated with pelagic carbon (H-Print) within their diet. We also identified a statistically significant ( R<superscript>2</superscript> = 0.82; p ≤ 0.01) change point in the proportion of sympagic/pelagic carbon within beluga around the year 2000, signified by consistently reducing δ<superscript>15</superscript>N, coupled with increasing pelagic carbon composition. This observed shift from sympagic to pelagic contribution to diet is likely to remain a feature of the Cumberland Sound ecosystem during the projected reduction of sea ice. [ABSTRACT FROM AUTHOR]
- Subjects :
- WHALES
DIET
CARBON content of water
SEA ice
HABITATS
ECOSYSTEMS
Subjects
Details
- Language :
- English
- ISSN :
- 00243590
- Volume :
- 62
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Limnology & Oceanography
- Publication Type :
- Academic Journal
- Accession number :
- 123950695
- Full Text :
- https://doi.org/10.1002/lno.10520