Diet of pygmy sperm whales (<i>Kogia breviceps</i>) in the Hawaiian Archipelago

West, Kristi L.; Walker, W. Allan; Baird, Robin W.; White, W.T.; Levine, Gregg; Brown, Eric K.; Schofield, David

doi:10.1111/j.1748-7692.2009.00295.x

Cited by 29 publications

(21 citation statements)

References 12 publications

(19 reference statements)

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“…These findings are similar to previous studies conducted in South African and Hawaiian waters, where kogiid whale diets contained between 38 and 55 species of cephalopod prey (Plön , West et al . ). Conversely, kogiid whale diets from waters of the northeastern Atlantic, Tawain, and New Zealand contained about half the number of prey species as was observed in the present study (Wang et al .…”

Section: Discussionmentioning

confidence: 97%

“…, Beatson , West et al . ). In the present study, histioteuthids were found in the stomachs of all but one whale, and cranchiid squids occurred in the majority (74%) of pygmy and dwarf sperm whales sampled.…”

Section: Discussionmentioning

confidence: 97%

“… , Beatson ), except in Hawaiian waters where crustaceans contributed 15% by number to whale diets (West et al . ). Crustaceans were noticeably absent in the present study, and fish prey only occurred in the stomach of a single female pygmy sperm whale.…”

Section: Discussionmentioning

confidence: 97%

“…, West et al . ), it seems likely that additional samples would reveal a wider range of fish and crustacean prey consumed by populations foraging in the western Atlantic.…”

Section: Discussionmentioning

confidence: 99%

“…), the Hawaiian Archipelago (West et al . ), and South Africa (Plön ). Isotopic values of pygmy sperm whale tissues have also been reported in a few studies, though sample sizes were very small (Ostrom et al .…”

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confidence: 99%

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Foraging ecology and niche overlap in pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales from waters of the U.S. mid‐Atlantic coast

Staudinger

McAlarney

McLellan

et al. 2013

Marine Mammal Science

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A complementary approach of stomach content and stable isotope analyses was used to characterize the foraging ecology and evaluate niche overlap between pygmy (Kogia breviceps) and dwarf (K. sima) sperm whales stranded on the U.S. mid‐Atlantic coast between 1998 and 2011. Food habits analysis demonstrated both species were primarily teuthophagous, with 35 species of cephalopods, and 2 species of mesopelagic fishes represented in their overall diets. Pianka's Index of niche overlap suggested high overlap between whale diets (On = 0.92), with squids from the families Histioteuthidae, Cranchidae, and Ommastrephidae serving as primary prey. Pygmy sperm whales consumed slightly larger prey sizes (mean mantle length [ML] = 10.8 cm) than dwarf sperm whales (mean ML = 7.8 cm). Mean prey sizes consumed by pygmy sperm whales increased with growth, but showed no trend in dwarf sperm whales. Significant differences were not detected in δ15N and δ13C values of muscle tissues from pygmy (10.8‰ ± 0.5‰, −17.1‰ ± 0.6‰), and dwarf sperm whales (10.7‰ ± 0.5‰, −17.0‰ ± 0.4‰), respectively. Isotopic niche widths also did not differ significantly and dietary overlap was high between the two species. Results suggest the feeding ecologies of the pygmy and dwarf sperm whales are similar and both species occupy equivalent trophic niches in the region.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

“…, West et al . ), it seems likely that additional samples would reveal a wider range of fish and crustacean prey consumed by populations foraging in the western Atlantic.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Foraging ecology and niche overlap in pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales from waters of the U.S. mid‐Atlantic coast

Staudinger

McAlarney

McLellan

et al. 2013

Marine Mammal Science

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The economic tradeoffs and ecological impacts associated with a potential mesopelagic fishery in the California Current

Chapman

Koehn

Hoagland

2022

Ecological Applications

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The ocean's mesopelagic zone (200–1000 m) remains one of the most understudied parts of the ocean despite knowledge that mesopelagic fishes are highly abundant. Apex predators from the surface waters are known to consume these fishes, constituting an important ecological interaction. Some countries have begun exploring the potential harvest of mesopelagic fishes to supply fishmeal and fish oil markets due to the high fish abundance in the mesopelagic zone compared with overfished surface waters. This study explored the economic and ecological implications of a moratorium on the harvest of mesopelagic fishes such as lanternfish off the US West Coast, one of the few areas where such resources are managed. We adapted a bioeconomic decision model to examine the tradeoffs between the values gained from a hypothetical mesopelagic fishery with the potential values lost from declines in predators of mesopelagic fishes facing a reduced prey resource. The economic rationale for a moratorium on harvesting mesopelagics was sensitive both to ecological relationships and the scale of the nonmarket values attributed to noncommercial predators. Using a California Current‐based ecological simulation model, we found that most modeled predators of mesopelagic fishes increased in biomass even under high mesopelagic harvest rates, but the changes (either increases or decreases) were small, with relatively few predators responding with more than a 10% change in their biomass. While the ecological simulations implied that a commercial mesopelagic fishery might not have large biomass impacts for many species in the California Current system, there is still a need to further explore the various roles of the mesopelagic zone in the ocean.

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Pygmy Sperm Whale Kogia breviceps (de Blainville, 1838)

Plön

2022

Handbook of the Mammals of Europe

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Diet of pygmy sperm whales (Kogia breviceps) in the Hawaiian Archipelago

Cited by 29 publications

References 12 publications

Foraging ecology and niche overlap in pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales from waters of the U.S. mid‐Atlantic coast

Foraging ecology and niche overlap in pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales from waters of the U.S. mid‐Atlantic coast

The economic tradeoffs and ecological impacts associated with a potential mesopelagic fishery in the California Current

Pygmy Sperm Whale Kogia breviceps (de Blainville, 1838)

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