Muscle biochemistry of a pelagic delphinid (<i>Stenella longirostris longirostris</i>): insight into fishery-induced separation of mothers and calves

Noren, Shawn R.; West, Kristi L.

doi:10.1242/jeb.153668

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…Finally, researchers and managers should focus on other possible causes for the lack of recovery in ETP pelagic dolphins, including the possibility that ongoing fishing activities may be having a negative impact on reproduction (Archer et al . , Noren , Noren and West ).…”

Section: Discussionmentioning

confidence: 98%

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Mitogenomic differentiation in spinner (Stenella longirostris) and pantropical spotted dolphins (S. attenuata) from the eastern tropical Pacific Ocean

Leslie

Archer

Morin

2018

Marine Mammal Science

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Spinner dolphins (Stenella longirostris) and pantropical spotted dolphins (S. attenuata) show high intraspecific morphological diversity and endemic subspecies in the eastern tropical Pacific Ocean (ETP). Previous studies of mitochondrial DNA have found low genetic differentiation among most of these groups, possibly due to demographic factors, ongoing gene flow, and/or recent divergence. These species were heavily depleted due to bycatch in the ETP yellowfin tuna fishery. Because understanding population structure is important for accurate management of the recovery of these species, we collected whole mitochondrial genome sequences from 104 spinner and 76 spotted dolphins to test structure hypotheses at multiple hierarchical taxonomic levels. Results show differences between subspecies of spinner and spotted dolphins, but no support for the division of existing offshore stocks of spotted dolphins. We compare these results to previous results of genome‐wide nuclear SNP data and suggest high haplotype diversity, female dispersal, and/or relative power of the two data sets explains the differences observed. Interestingly, increasing the amount of mitochondrial data (base pairs and genes) did not increase ability to delimit population units. This study supports a genetic basis for management units at the subspecies level, and provides critical information for mitigating historical and continued fisheries impacts.

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Section: Discussionmentioning

confidence: 98%

“…, Noren et al . , Noren and West ). The current population abundance estimates are based on data from 2006 (Gerrodette et al .…”

Section: Spinner Dolphins (Stenella Longirostris)mentioning

confidence: 98%

Mitogenomic differentiation in spinner (Stenella longirostris) and pantropical spotted dolphins (S. attenuata) from the eastern tropical Pacific Ocean

Leslie

Archer

Morin

2018

Marine Mammal Science

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Extremely Elevated Myoglobin Contents in the Pelagic Melon-Headed Whale (Peponocephala electra) after Prolonged Postnatal Maturation

Noren

West

2020

Physiological and Biochemical Zoology

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Building Cetacean Locomotor Muscles throughout Ontogeny to Support High-Performance Swimming into Adulthood

Noren

2023

Integrative and Comparative Biology

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Synopsis The demands on the locomotor muscles at birth are different for cetaceans than terrestrial mammals. Cetacean muscles do not need to support postural costs as the neonate transitions from the womb because water’s buoyant force supports body weight. Rather, neonatal cetacean muscles must sustain locomotion under hypoxic conditions as the neonate accompanies its mother swimming underwater. Despite disparate demands at birth, cetaceans like terrestrial mammals require postnatal development to attain mature musculature. Neonatal cetaceans have a low proportion of muscle mass, and their locomotor muscles have lower mitochondrial density, myoglobin content (Mb), and buffering capacity than those found in the adult locomotor muscle. For example, the locomotor muscle of the neonatal bottlenose dolphin has only 10 and 65% of the Mb and buffering capacity, respectively, found in the adult locomotor muscle. The maturation period required to achieve mature Mb and buffering capacity in the locomotor muscle varies across cetacean species from 0.75 to 4 and 1.17 to 3.4 years, respectively. The truncated nursing interval of harbor porpoises and sub-ice travel of beluga whales may be drivers for faster muscle maturation in these species. Despite these postnatal changes in the locomotor muscle, ontogenetic changes in locomotor muscle fiber type seem to be rare in cetaceans. Regardless, the underdeveloped aerobic and anaerobic capacities of the locomotor muscle of immature dolphins result in diminished thrusting capability and swim performance. Size-specific stroke amplitudes (23–26% of body length) of 0–3-month-old dolphins are significantly smaller than those of >10-month-olds (29–30% of body length), and 0–1-month-olds only achieve 37 and 52% of the mean and maximum swim speed of adults, respectively. Until swim performance improves with muscle maturation, young cetaceans are precluded from achieving their pod’s swim speeds, which could have demographic consequences when fleeing anthropogenic disturbances.

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Muscle biochemistry of a pelagic delphinid (Stenella longirostris longirostris): insight into fishery-induced separation of mothers and calves

Cited by 5 publications

References 45 publications

Mitogenomic differentiation in spinner (Stenella longirostris) and pantropical spotted dolphins (S. attenuata) from the eastern tropical Pacific Ocean

Mitogenomic differentiation in spinner (Stenella longirostris) and pantropical spotted dolphins (S. attenuata) from the eastern tropical Pacific Ocean

Extremely Elevated Myoglobin Contents in the Pelagic Melon-Headed Whale (Peponocephala electra) after Prolonged Postnatal Maturation

Building Cetacean Locomotor Muscles throughout Ontogeny to Support High-Performance Swimming into Adulthood

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