scholarly journals Foraging ecology of mature male Antarctic minke whales (Balaenoptera bonaerensis) revealed by stable isotope analysis of baleen plates

Polar Science ◽  
2021 ◽  
pp. 100785
Author(s):  
Hiroshi Ishikawa ◽  
Mayuko Otsuki ◽  
Tsutomu Tamura ◽  
Kenji Konishi ◽  
Takaharu Bando ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Mature Male ◽  
Minke Whales ◽  
Balaenoptera Bonaerensis

scholarly journals Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates

Polar Biology ◽  
2021 ◽  
Vol 44 (3) ◽  
pp. 621-629
Author(s):  
Mayuka Uchida ◽  
Ippei Suzuki ◽  
Keizo Ito ◽  
Mayumi Ishizuka ◽  
Yoshinori Ikenaka ◽  
...  
Keyword(s):  
Growth Rate ◽  
Stable Isotope ◽  
Antarctic Krill ◽  
Isotope Analysis ◽  
Stomach Contents ◽  
Annual Growth Rate ◽  
Pleuragramma Antarcticum ◽  
Minke Whales ◽  
Balaenoptera Bonaerensis ◽  
The Antarctic

AbstractAntarctic minke whales (Balaenoptera bonaerensis) are migratory capital breeders that experience intensive summer feeding on Antarctic krill (Euphausia superba) in the Southern Ocean and winter breeding at lower latitudes, but their prey outside of the Antarctic is unknown. Stable isotope analyses were conducted on δ13C and δ15N from the baleen plates of ten pregnant Antarctic minke whales to understand the growth rate of the baleen plate and their diet in lower latitudes. Two to three oscillations along the length of the edge of the baleen plate were observed in δ15N, and the annual growth rate was estimated to be 75.2 ± 20.4 mm, with a small amplitude (0.97 ± 0.21 ‰). Bayesian stable isotope mixing models were used to understand the dominant prey that contributed to the isotopic component of the baleen plate using Antarctic krill from the stomach contents and reported values of Antarctic coastal krill (Euphausia crystallorophias), Antarctic silver fish (Pleuragramma antarcticum), Australian krill spp., and Australian pelagic fish spp.. The models showed that the diet composition of the most recent three records from the base of the baleen plates (model 1) and the highest δ15N values in each baleen plate (model 2) were predominantly Antarctic krill, with a contribution rate of approximately 80%. The rates were approximately 10% for Antarctic coastal krill and less than 2.0% for the two Australian prey groups in both models. These results suggest that pregnant Antarctic minke whales did not feed on enough prey outside of the Antarctic to change the stable isotope values in their baleen plates.

Stable Isotope Analysis Enhances Our Understanding of Diamondback Terrapin (Malaclemys terrapin) Foraging Ecology

2018 ◽  
Vol 42 (2) ◽  
pp. 596-611 ◽  
Author(s):  
Mathew J. Denton ◽  
Amanda W. J. Demopoulos ◽  
John D. Baldwin ◽  
Brian J. Smith ◽  
Kristen M. Hart
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Diamondback Terrapin ◽  
Malaclemys Terrapin

Seasonal variation in the foraging ecology of a zooplanktivorous seabird assessed with stable isotope analysis

2013 ◽  
Vol 10 (4) ◽  
pp. 383-390 ◽  
Author(s):  
J. Mark Hipfner ◽  
Laura Mcfarlane-Tranquilla ◽  
Brianne Addison ◽  
Keith A. Hobson
Keyword(s):  
Seasonal Variation ◽  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Isotope Analysis

Origin and foraging ecology of male loggerhead sea turtles from southern Brazil revealed by genetic and stable isotope analysis

2019 ◽  
Vol 166 (6) ◽  
Author(s):  
Luciana Medeiros ◽  
Danielle S. Monteiro ◽  
Silvina Botta ◽  
Maíra C. Proietti ◽  
Eduardo R. Secchi
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Sea Turtles ◽  
Isotope Analysis ◽  
Southern Brazil ◽  
Loggerhead Sea Turtles

Foraging ecology of the common dolphin Delphinus delphis revealed by stable isotope analysis

2020 ◽  
Vol 652 ◽  
pp. 173-186
Author(s):  
KJ Peters ◽  
SJ Bury ◽  
EL Betty ◽  
GJ Parra ◽  
G Tezanos-Pinto ◽  
...  
Keyword(s):  
New Zealand ◽  
Stable Isotope ◽  
Body Length ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Minor Effect ◽  
Common Dolphin ◽  
Delphinus Delphis ◽  
Common Dolphins

Dolphins are among the largest and most diverse predators in marine ecosystems, but our understanding of their foraging ecology, which is crucial for ecosystem management, is poor. Delphinus delphis (common dolphins) are found in tropical and temperate waters globally. Stomach content studies indicate they are opportunistic predators that feed locally on abundant small pelagic schooling fish, but information is lacking on how their diet may vary seasonally and with ontogeny. We investigated effects of body length, sex, season, and year on D. delphis diet in the Hauraki Gulf, New Zealand, using carbon (δ13C) and nitrogen (δ15N) stable isotope analysis of 56 skin samples collected during 13 years (2004-2016). Dolphin δ15N values changed with body length, suggesting ontogenetic dietary variation. Nitrogen isotope values were higher in austral autumn/winter compared to spring/summer, whilst δ13C values decreased throughout the study period, suggesting temporal changes in primary productivity likely affecting the dolphins’ diet. Sex had a minor effect on dolphin δ13C values, with male and female isotopic niches overlapping by 62.6% and 45.2% (respectively). Our results provide a baseline for detecting future changes in the trophic ecology of D. delphis in a key habitat in New Zealand and highlight their role as a sentinel species in this coastal ecosystem.

scholarly journals Whisker growth dynamics in two North Pacific pinnipeds: implications for determining foraging ecology from stable isotope analysis

2016 ◽  
Vol 554 ◽  
pp. 213-224 ◽  
Author(s):  
EA McHuron ◽  
SM Walcott ◽  
J Zeligs ◽  
S Skrovan ◽  
DP Costa ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
North Pacific ◽  
Whisker Growth ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Growth Dynamics
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