Robert Mauck

Robert Mauck
Kenyon College · Department of Biology

About

64
Publications
3,927
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1,407
Citations

Publications

Publications (64)
Article
Full-text available
Conservation of mobile organisms is difficult in the absence of detailed information about movement and habitat use. While the miniaturization of tracking devices has eased the collection of such information, it remains logistically and financially difficult to track a wide range of species across a large geographic scale. Predictive distribution m...
Article
Full-text available
Reproduction in procellariiform birds is characterized by a single egg clutch, slow development, a long breeding season and obligate biparental care. Female Leach’s Storm Petrels Hydrobates leucorhous, nearly monomorphic members of this order, produce eggs that are between 20 and 25% of adult body weight. We tested whether female foraging behaviour...
Article
Avian incubation investment represents a trade‐off between the energetic demands of the parent and the thermal needs of the embryo. Parental energy balance and investment in somatic maintenance relative to incubation investment can be indexed by the rate of feather growth. Feather growth rates, or ptilochronology, of adult Leach’s Storm‐Petrels Oce...
Article
Full-text available
Leach’s Storm-Petrels (Hydrobates leucorhous) are burrow-nesting seabirds that breed on coastal islands throughout much of the North Atlantic, with most of the world’s population breeding in Atlantic Canada. Population declines in the past 20–30 years have resulted in the species being uplisted to “Vulnerable” on the International Union for the Con...
Poster
Full-text available
Leach’s storm-petrel (Oceanodroma leucorhoa = Hydrobates leucorhous) is a small seabird species that was listed as globally vulnerable on the IUCN’s Red List of Threatened Species in 2016. Breeding populations have declined more than 30% over the last three generations in Atlantic Canada. Elevated mercury exposure may be contributing to this specie...
Article
Full-text available
Despite their importance in marine food webs, much has yet to be learned about the spatial ecology of small seabirds. This includes the Leach's storm-petrel Oceanodroma leucorhoa, a species that is declining throughout its Northwest Atlantic breeding range. In 2013 and 2014, we used global location sensors to track foraging movements of incubating...
Article
Full-text available
Despite their importance in marine food webs, much has yet to be learned about the spatial ecology of small seabirds. This includes the Leach's storm-petrel Oceanodroma leucorhoa, a species that is declining throughout its Northwest Atlantic breeding range. In 2013 and 2014, we used global location sensors to track foraging movements of incubating...
Data
Incubation foraging trip metrics according to individual and colony. (XLSX)
Data
Processed and filtered GLS positions according to individual and colony. (XLSX)
Article
Full-text available
The salient feature of anthropogenic climate change over the last century has been the rise in global mean temperature. However, global mean temperature is not used as an explanatory variable in studies of population-level response to climate change, perhaps because the signal to noise ratio of this gross measure makes its effect difficult to detec...
Article
Genes of the major histocompatibility complex (MHC) exhibit heterozygote advantage in immune defense, which in turn can select for MHC-disassortative mate choice. However, many species lack this expected pattern of MHC-disassortative mating. A possible explanation lies in evolutionary processes following gene duplication: if two duplicated MHC gene...
Article
Patterns of nest site selection exhibited at the scale of a population should result from initial preferences of individuals occupying nest sites as well as preferences exhibited by individuals moving between nest sites. We tested whether nest-site preferences measured at the population scale were predictive of patterns of burrow switching by Leach...
Conference Paper
Background/Question/Methods For endotherms living in cold climates, warming temperatures associated with climate change may present energetic benefits. These benefits may lead to shifts in patterns or success of parental care. Life history theory suggests that long-lived organisms should favor investment in future fitness potential, in some cases...
Article
Full-text available
The Black Guillemot (Cepphus grylle) is a monomorphic seabird characterized by its muted plumage and bright red feet, which it prominently displays during courtship. Foot color and oxidative stress were analyzed in a Black Guillemot colony at the Bay of Fundy during the 2006 and 2007 breeding seasons. While no relationship between red intensity of...
Article
Full-text available
Physiological and environmental factors shape foraging strategies and energy balance. For species that breed seasonally, physiological changes in an individual can have short-term effects, but also can persist as carry-over effects from one season to the next, such as from the overwintering season to the breeding season. We tested the hypothesis th...
Article
Full-text available
The major histocompatibility complex (Mhc) is subject to pathogen-mediated balancing selection and can link natural selection with mate choice. We characterized two Mhc class II B loci in Leach's storm-petrel, Oceanodroma leucorhoa, focusing on exon 2 which encodes the portion of the protein that binds pathogen peptides. We amplified and sequenced...
Data
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Article
Full-text available
Abstract Island organisms face a range of extrinsic threats to their characteristically small populations. Certain biological differences between island and continental organisms have the potential to exacerbate these threats. Understanding how island birds differ from their continental relatives may provide insight into population viability and se...
Article
Age‐related patterns of survival and reproduction have been explained by accumulated experience (‘experience hypothesis’), increased effort (‘effort hypothesis’), and intrinsic differences in phenotypes (‘selection hypothesis’). We examined the experience and effort hypotheses using a 40‐year data set in a population of Leach's storm‐petrels Oceano...
Article
Full-text available
Background: In dimorphic seabirds, the larger sex tends to provision more than the smaller sex. In contrast, monogamy and biparental care are often associated with equal effort between the sexes. However, the few studies that have tested sex-specific effort in monomorphic seabirds have primarily examined the details of foraging at sea. Hypotheses:...
Article
Leach's storm-petrels accumulate large amounts of body mass throughout the nestling period. Approximately 4days before fledging, nestlings weigh 50-100% more than adults. In order to shed this excess mass, nestlings engage in behavioral anorexia, and leave the burrow when they are light enough to fly. During this prefledging period, we measured sev...
Article
Radio telemetry can be a valuable tool for studying the behavior, physiology, and demography of birds. We tested the assumption that radio transmitters have no adverse effects on body condition in an island population of Savannah Sparrows (Passerculus sandwichensis). To assess possible changes in condition, 20 radiotagged and 25 nontagged Savannah...
Article
Selection on physiological traits is thought to mediate the evolution of individual life-history parameters like reproduction, longevity, and the tradeoffs between them, but almost nothing is known about the relationships between physiological and life-history parameters in the wild. Antioxidants are strong candidates to correlate with life histori...
Article
The nocturnal activity of burrow-nesting seabirds, such as storm-petrels and shearwaters, makes it difficult to study their incubation behavior. In particular, little is known about possible differences in the incubation behavior of adults at successful and unsuccessful nests. We combined the use of passive integrated transponder (PIT) technology a...
Article
Telomere dynamics link molecular and cellular mechanisms with organismal processes and therefore may explain variation in a number of important life-history traits. Telomere length has been used to estimate age in free-living populations of animals. Such estimation is a potentially powerful tool in the context of population dynamics and management,...
Article
Full-text available
Identifying mechanisms that underlie variation in adult survivorship provide insight into the evolution of life history strategies and phenotypic variation in longevity. There is accumulating evidence that shortening telomeres, the protective caps at the ends of chromosomes, play an important role in individual variation in longevity. Given that te...
Article
1. We studied physiological, behavioural and demographic traits of House Wrens ( Troglodytes aedon ) in tropical Panama and temperate zone Ohio to explore the hypothesis that tropical birds with higher adult survival rates invest less in annual reproduction than their temperate zone counterparts. 2. Compared with wrens from Ohio, Panamanian wrens i...
Article
Mating with close relatives generally results in reduced reproductive success (inbreeding depression) because it increases the risk that rare deleterious recessive alleles will be expressed in offspring. None the less, incest may occur when animals have incomplete knowledge about relatedness or when the costs of avoiding inbreeding are high. Over a...
Article
1. Using a simple technique for assessing constitutive innate immune function recently adapted for use in wild populations, we characterize changes in avian immune system development by repeated measurements of individuals over the period of nestling growth in a wild population of Leach's Storm-Petrels (Oceanodroma leucorhoa). 2. We measured levels...
Article
Full-text available
Despite evidence that some individuals achieve both superior reproductive performance and high survivorship, the factors underlying variation in individual quality are not well understood. The compensation and increased-intake hypotheses predict that basal metabolic rate (BMR) influences reproductive performance; if so, variation in BMR may be rela...
Article
Summary Leach's Storm-Petrel (Oceanodroma leucorhoa) chicks accumulate fat through most of the nestling period, near the end of which they typically weigh 50–100% more than their parents. Much of this excess mass is lost abruptly prior to leaving the nest and fledging itself marks the termination of parental care. In this study, we evaluated the hy...
Article
Age-specific reproductive success has been demonstrated in many species. Three hypotheses have been raised to explain this general phenomenon: the experience hypothesis based on age-specific reproductive experience, the effort hypothesis based on age-specific reproductive effort, and the selection hypothesis based on progressive disappearance of ph...
Article
Animals living in groups are thought to gain fitness through decreased predation risk, while often paying a cost in terms of increased competition in foraging. Thus, the balance struck between predator avoidance and foraging should be affected by group membership. For animals that avoid predation by withdrawing into a refuge (i.e. ‘hiding’), such a...
Article
Applications of molecular methods to assess parentage have revealed that the distribution of reproductive success among individuals often differs, sometimes dramatically, from expectation based on observation of behavioral association. Much theory exists on whether and when males should reduce parental care in response to level of paternity. Life-h...
Article
Over a 9-yr period, we studied dispersal of young banded Savannah Sparrows (Passerculus sandwichensis) from their natal nest to the site where they first bred 1 yr later in a population on an isolated archipelago in the Bay of Fundy, Canada. On a broad geographic scale, young birds were highly philopatric, returning from wintering grounds several t...
Article
Investment in current reproduction should be balanced against future reproduction. Thus, the allocation of resources during a breeding season is a trade-off between the needs of the parent and the needs of the offspring. Life-history theory predicts the trade-off point to favour the parent in long-lived species and the offspring in short-lived spec...
Article
We used multilocus minisatellite DNA fingerprinting to estimate the frequency of extrapair fertilizations in a population of Leach's Storm-Petrel (Oceanodroma leucorhoa) on Kent Island, New Brunswick, Canada. Leach's Storm-Petrel is a member of Procellariiformes, an order of long-lived pelagic birds characterized by long-term pairbonds, single-egg...

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