Feeding ecology and population delineation of south‐eastern Atlantic and south‐western Indian Ocean humpback whales using stable isotope analysis

2020 ◽  
Vol 30 (3) ◽  
pp. 486-496
Author(s):  
Shaena Montanari ◽  
Francine Kershaw ◽  
Howard C. Rosenbaum
Keyword(s):  
Stable Isotope ◽  
Indian Ocean ◽  
Stable Isotope Analysis ◽  
Feeding Ecology ◽  
Isotope Analysis ◽  
Western Indian Ocean ◽  
Humpback Whales ◽  
South Eastern

The diets of humpback whales (Megaptera novaeangliae) on the shelf and oceanic feeding grounds in the western North Pacific inferred from stable isotope analysis

2012 ◽  
Vol 29 (3) ◽  
pp. E253-E265 ◽  
Author(s):  
Olga A. Filatova ◽  
Briana H. Witteveen ◽  
Anton A. Goncharov ◽  
Alexei V. Tiunov ◽  
Maria I. Goncharova ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
North Pacific ◽  
Western North Pacific ◽  
Isotope Analysis ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Feeding Grounds

scholarly journals Feeding Ecology of Three Euphausiid Species in the North Pacific Ocean Inferred From 18S V9 Metabarcoding and Stable Isotope Analysis

2021 ◽  
Vol 8 ◽  
Author(s):  
Fanyu Zhou ◽  
Junya Hirai ◽  
Koji Hamasaki ◽  
Sachiko Horii ◽  
Atsushi Tsuda
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Feeding Ecology ◽  
North Pacific ◽  
Prey Availability ◽  
Trophic Position ◽  
Isotope Analysis ◽  
Trophic Levels ◽  
Gut Contents ◽  
North Pacific Subtropical Gyre

Euphausiids are abundant micronekton and important links between higher and lower trophic levels in marine ecosystems; however, their detailed diets cannot be fully understood by conventional microscopy, especially in subtropical areas. Here, we report the euphausiid community structure in the California Current (CC) area and the eastern/western North Pacific subtropical gyre (ESG and WSG) and detail the feeding ecology of the dominant species (Euphausia pacifica, E. brevis, and E. hemigibba) in each region using a combined approach of gut content analysis via 18S V9 metabarcoding and stable carbon and nitrogen isotope analysis. A pronounced omnivorous feeding of all studied euphausiid species was supported by both methods: phytoplanktonic taxonomic groups (Dinophyta, Stramenopiles, and Archaeplastida), Copepoda, and Hydrozoa were detected in the gut contents; all the three euphausiid species displayed an intermediate trophic position between the net plankton (0.2–1.0 mm) and the myctophid fish (15.2–85.5 mm). However, Hydrozoa found in euphausiid gut contents likely derived from a potential cod-end feeding, based on isotope analysis. E. pacifica in the CC province ingested more autotrophic prey, including pelagophyte and green algae, due to a greater abundance of Stramenopiles and Archaeplastida in shallow layers of CC water. On the other hand, non-autotrophic prey such as mixotrophic Kareniaceae dinoflagellates, Pontellidae and Clausocalanidae copepods, and Sphaerozoidae rhizarian contributed more to the diets of E. brevis and E. hemigibba because of a lower chlorophyll a concentration or potentially a scarcity of autotrophic prey availability in ESG and WSG. The feeding patterns of dominant euphausiid species conducting filter feeding were thus largely determined by phytoplankton prey availability in the environments. Dietary difference across three species was also indicated by stable isotope analysis, with a lower mean trophic level of E. pacifica (2.32) than E. brevis (2.48) and E. hemigibba (2.57). These results verify direct trophic interactions between euphausiids and primary production and suggest that the omnivorous feeding habit is a favorable character for dominant Euphausia species.

Stable isotope analysis reveals feeding ecology and trophic position of black marlin off eastern Taiwan

2020 ◽  
Vol 175 ◽  
pp. 104821 ◽  
Author(s):  
Wei-Chuan Chiang ◽  
Ching-Tsun Chang ◽  
Daniel J. Madigan ◽  
Aaron B. Carlisle ◽  
Michael K. Musyl ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Feeding Ecology ◽  
Trophic Position ◽  
Isotope Analysis

Stable isotope analysis reveals that humpback whales (Megaptera novaeangliae) primarily consume capelin (Mallotus villosus) in coastal Newfoundland, Canada

2021 ◽  
Author(s):  
Kelsey Johnson ◽  
Gail Davoren
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Niche Overlap ◽  
Prey Type ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Mallotus Villosus ◽  
Δ13c And Δ15n ◽  
Capelin Mallotus Villosus

On the Newfoundland, Canada foraging ground, humpback whales (Megaptera novaeangliae (Borowski, 1781)) are found associated with a dominant forage fish species, capelin (Mallotus villosus (Müller, 1776), that experienced a population collapse in the early 1990s and has not recovered. Our primary goal was to reconstruct dietary proportions of humpback whales on their summer foraging grounds off the northeastern Newfoundland coast during July-August, 2016 and 2017 using a Bayesian stable isotope mixing model (MixSiar). Modelled dietary proportions were similar in both years, with capelin comprising ~90% of the diet. However, both δ13C and δ15N in humpback whale skin differed significantly between years, resulting in minimal dietary niche overlap (9%). Lipid-extracted and nonlipid-extracted skin samples were used to develop a lipid normalization equation: ∆13C = – 3.184 + 1.011(C:N). Overall, findings suggest that capelin is the primary prey type of humpback whales in coastal Newfoundland, despite the continued collapsed state of the capelin population. Findings also reiterate that dietary reconstruction from stable isotope analysis of cetacean skin can be misinterpreted without concurrently sampled isotopic ratios of potential prey types.

Evidence of two subaggregations of humpback whales on the Kodiak, Alaska, feeding ground revealed from stable isotope analysis

2015 ◽  
Vol 31 (4) ◽  
pp. 1378-1400 ◽  
Author(s):  
Dana L. Wright ◽  
Briana Witteveen ◽  
Kate Wynne ◽  
Larissa Horstmann‐Dehn
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Humpback Whales ◽  
Feeding Ground

Carbon source and trophic position of pelagic fish in coastal waters of south-eastern Izu Peninsula, Japan, identified by stable isotope analysis

2007 ◽  
Vol 73 (3) ◽  
pp. 593-608 ◽  
Author(s):  
Noriyuki TAKAI ◽  
Noriyuki HIROSE ◽  
Takuya OSAWA ◽  
Kazuyuki HAGIWARA ◽  
Takahito KOJIMA ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Carbon Source ◽  
Stable Isotope Analysis ◽  
Coastal Waters ◽  
Trophic Position ◽  
Isotope Analysis ◽  
Pelagic Fish ◽  
South Eastern ◽  
Izu Peninsula

scholarly journals Light Stable Isotope Analysis of Diet in Corded Ware Culture Communities: Święte, Jarosław District, South-Eastern Poland

2018 ◽  
Vol 23 (1) ◽  
pp. 229-245 ◽  
Author(s):  
Karolina Werens ◽  
Anita Szczepanek ◽  
Paweł Jarosz
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Isotopic Analysis ◽  
Animal Protein ◽  
Protein Component ◽  
Human Bone ◽  
Bone Collagen ◽  
C3 Plant ◽  
South Eastern

Abstract The presented study was based on isotopic analysis of δ13C and δ15N in human bone collagen samples from graves of the Corded Ware culture in Święte, south-east Poland. Isotopic values demonstrate a relatively narrow variation, ranging from -20.4‰ to -19.8‰ and 10.6‰ to 12.0‰ for δ13C and δ15N values, respectively. The diet was likely C3 plant-based with a substantial animal protein component, including predominantly terrestrial and possibly riverine resources.

scholarly journals Feeding Ecology of Juvenile Yellowfin Tuna from Waters Southwest of Taiwan Inferred from Stomach Contents and Stable Isotope Analysis

2015 ◽  
Vol 7 (1) ◽  
pp. 537-548 ◽  
Author(s):  
Jinn-Shing Weng ◽  
Ming-An Lee ◽  
Kwang-Ming Liu ◽  
Ming-Shu Hsu ◽  
Mine-Kune Hung ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Feeding Ecology ◽  
Isotope Analysis ◽  
Stomach Contents ◽  
Yellowfin Tuna
Sign in / Sign up

Export Citation Format

Share Document