Hi Marmam Colleagues, My co-authors and I are pleased to announce the publication of our study detailed below. The study provides new details on the physiological development of the aerobic dive capacity in young baleen whales.
Cartwright R, Newton C, West KM, Rice J, Niemeyer M, Burek K, Wilson A, Wall AN, Remonida-Bennett J, Tejeda A, Messi S. Tracking the Development of Muscular Myoglobin Stores in Mysticete Calves. PloS one. 2016 Jan 1;11(1). Abstract For marine mammals, the ability to tolerate apnea and make extended dives is a defining adaptive trait, facilitating the exploitation of marine food resources. Elevated levels of myoglobin within the muscles are a consistent hallmark of this trait, allowing oxygen collected at the surface to be stored in the muscles and subsequently used to support extended dives. In mysticetes, the largest of marine predators, details on muscular myoglobin levels are limited. The developmental trajectory of muscular myoglobin stores has yet to be documented and any physiological links between early behavior and the development of muscular myoglobin stores remain unknown. In this study, we used muscle tissue samples from stranded mysticetes to investigate these issues. Samples from three different age cohorts and three species of mysticetes were included (total sample size = 18). Results indicate that in mysticete calves, muscle myoglobin stores comprise only a small percentage (17–23%) of conspecific adult myoglobin complements. Development of elevated myoglobin levels is protracted over the course of extended maturation in mysticetes. Additionally, comparisons of myoglobin levels between and within muscles, along with details of interspecific differences in rates of accumulation of myoglobin in very young mysticetes, suggest that levels of exercise may influence the rate of development of myoglobin stores in young mysticetes. This new information infers a close interplay between the physiology, ontogeny and early life history of young mysticetes and provides new insight into the pressures that may shape adaptive strategies in migratory mysticetes. Furthermore, the study highlights the vulnerability of specific age cohorts to impending changes in the availability of foraging habitat and marine resources. The full paper can be accessed via the following link: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0145893 Best regards, Rachel Cartwright Rachel Cartwright, PhD. Department of Biology CSU – Channel Islands Lead researcher – Keiki Kohola Project Tel: 805 437 2635 Email: [email protected] Website: www.caringforcalves.org _______________________________________________ MARMAM mailing list [email protected] https://lists.uvic.ca/mailman/listinfo/marmam
