Nicholas M. Kellar
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View article: Demographic and physiological signals of reproductive events in humpback whales on a southwest pacific breeding ground
Demographic and physiological signals of reproductive events in humpback whales on a southwest pacific breeding ground Open
The field of marine mammal conservation has dramatically benefited from the rapid advancement of methods to assess the reproductive physiology of individuals and populations from steroid hormones isolated from minimally invasive skin–blubb…
View article: An expert‐based system to predict population survival rate from health data
An expert‐based system to predict population survival rate from health data Open
Timely detection and understanding of causes for population decline are essential for effective wildlife management and conservation. Assessing trends in population size has been the standard approach, but we propose that monitoring popula…
View article: Estimating pregnancy rate from blubber progesterone levels of a blindly biopsied beluga population poses methodological, analytical and statistical challenges
Estimating pregnancy rate from blubber progesterone levels of a blindly biopsied beluga population poses methodological, analytical and statistical challenges Open
Beluga (Delphinapterus leucas) from the St. Lawrence Estuary, Canada, have been declining since the early 2000s, suggesting recruitment issues as a result of low fecundity, abnormal abortion rates or poor calf or juvenile survival. Pregnan…
View article: Serum correlation, demographic differentiation, and seasonality of blubber testosterone in common bottlenose dolphins, Tursiops truncatus, in Sarasota Bay, FL
Serum correlation, demographic differentiation, and seasonality of blubber testosterone in common bottlenose dolphins, Tursiops truncatus, in Sarasota Bay, FL Open
View article: Blubber steroid hormone profiles as indicators of physiological state in free-ranging common bottlenose dolphins (Tursiops truncatus)
Blubber steroid hormone profiles as indicators of physiological state in free-ranging common bottlenose dolphins (Tursiops truncatus) Open
View article: Corrigendum to: Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales
Corrigendum to: Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales Open
[This corrects the article DOI: 10.1093/conphys/cow050.].
View article: Tracking transcriptomic responses to endogenous and exogenous variation in cetaceans in the Southern California Bight
Tracking transcriptomic responses to endogenous and exogenous variation in cetaceans in the Southern California Bight Open
Marine wildlife populations are adapted to survive in highly dynamic environments. However, identifying the effects of endogenous versus exogenous variables on marine mammal physiology remains a substantial challenge in part because of the…
View article: Comparing progesterone in blubber and serum to assess pregnancy in wild beluga whales (Delphinapterus leucas)
Comparing progesterone in blubber and serum to assess pregnancy in wild beluga whales (Delphinapterus leucas) Open
Blood and blubber were sampled from live-captured beluga whales in Bristol Bay, Alaska. Progesterone levels were used to assess pregnancy status. For most cases, blubber progesterone levels correlated with serum, indicating that pregnancy …
View article: The Utility of Combining Stable Isotope and Hormone Analyses for Marine Megafauna Research
The Utility of Combining Stable Isotope and Hormone Analyses for Marine Megafauna Research Open
Stable isotope and hormone analyses offer insight into the health, stress, nutrition, movements, and reproduction of individuals and populations. Such information can provide early warning signs or more in-depth details on the ecological a…
View article: High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population
High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population Open
Antarctic humpback whales are recovering from near extirpation from commercial whaling. To understand the dynamics of this recovery and establish a baseline to monitor impacts of a rapidly changing environment, we investigated sex ratios a…
View article: Comprehensive Screening Links Halogenated Organic Compounds with Testosterone Levels in Male <i>Delphinus delphis</i> from the Southern California Bight
Comprehensive Screening Links Halogenated Organic Compounds with Testosterone Levels in Male <i>Delphinus delphis</i> from the Southern California Bight Open
While environmental pollutants have been associated with changes in endocrine health in cetaceans, efforts to link contaminant exposure with hormones have largely been limited to a list of known, targeted contaminants, overlooking minimall…
View article: Validation of a blubber-based endocrine pregnancy test for humpback whales
Validation of a blubber-based endocrine pregnancy test for humpback whales Open
Baleen whales have few identifiable external indicators of pregnancy state, making it challenging to study essential aspects of their biology and population dynamics. Pregnancy status in other marine mammals has been determined by measurin…
View article: Supplementary material from "High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population"
Supplementary material from "High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population" Open
Antarctic humpback whales are recovering from near extirpation from commercial whaling. To understand the dynamics of this recovery and establish a baseline to monitor impacts of a rapidly changing environment, we investigated sex ratios a…
View article: Table S1: Data associated with sample collection and genetic information from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population
Table S1: Data associated with sample collection and genetic information from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population Open
Data from individuals sampled along the Western Antarctic Peninsula, including genetic sex and genotype.
View article: Electronic supplementary material table header page from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population
Electronic supplementary material table header page from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population Open
ESM: High pregnancy rates in humpback whales (Megaptera novaeangliae) around the Western Antarctic Peninsula, evidence of a rapidly growing population
View article: Table S2: Data associated with blubber hormone evaluations for pregnancy state from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population
Table S2: Data associated with blubber hormone evaluations for pregnancy state from High pregnancy rates in humpback whales (<i>Megaptera novaeangliae</i>) around the Western Antarctic Peninsula, evidence of a rapidly growing population Open
Estimates of the probability of pregnancy based on blubber progesterone concentrations from female humpback whales of unknown pregnancy status biopsied along the Western Antarctic Peninsula.
View article: Initial validation of blubber cortisol and progesterone as indicators of stress response and maturity in an otariid; the California sea lion (Zalophus californianus)
Initial validation of blubber cortisol and progesterone as indicators of stress response and maturity in an otariid; the California sea lion (Zalophus californianus) Open
View article: Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales
Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales Open
[This corrects the article DOI: 10.1093/conphys/cow050.].
View article: Research on coastal bottlenose dolphins (Tursiops truncatus), including a photo-identification catalog, following the 2015 Refugio Beach oil spill in Santa Barbara County, California
Research on coastal bottlenose dolphins (Tursiops truncatus), including a photo-identification catalog, following the 2015 Refugio Beach oil spill in Santa Barbara County, California Open
View article: Blubber cortisol qualitatively reflects circulating cortisol concentrations in bottlenose dolphins
Blubber cortisol qualitatively reflects circulating cortisol concentrations in bottlenose dolphins Open
Stress hormones, released into circulation as a consequence of disturbance, are classically assayed from blood samples but may also be detected in a variety of matrices. Blubber and fecal samples can be remotely collected from free‐ranging…
View article: Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales
Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales Open
Understanding reproductive rates of wild animal populations is crucially important for management and conservation. Assessing pregnancy status of free-ranging cetaceans has historically been difficult; however, recent advances in analytica…
View article: First Assessment of the Sex Ratio for an East Pacific Green Sea Turtle Foraging Aggregation: Validation and Application of a Testosterone ELISA
First Assessment of the Sex Ratio for an East Pacific Green Sea Turtle Foraging Aggregation: Validation and Application of a Testosterone ELISA Open
Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation…
View article: Seasonal Variation in the Skin Transcriptome of Common Bottlenose Dolphins (Tursiops truncatus) from the Northern Gulf of Mexico
Seasonal Variation in the Skin Transcriptome of Common Bottlenose Dolphins (Tursiops truncatus) from the Northern Gulf of Mexico Open
As long-lived predators that integrate exposures across multiple trophic levels, cetaceans are recognized as sentinels for the health of marine ecosystems. Their utility as sentinels requires the establishment of baseline health parameters…
View article: Blubber Cortisol: A Potential Tool for Assessing Stress Response in Free-Ranging Dolphins without Effects due to Sampling
Blubber Cortisol: A Potential Tool for Assessing Stress Response in Free-Ranging Dolphins without Effects due to Sampling Open
When paired with dart biopsying, quantifying cortisol in blubber tissue may provide an index of relative stress levels (i.e., activation of the hypothalamus-pituitary-adrenal axis) in free-ranging cetacean populations while minimizing the …