Eva Garde
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View article: Chronicles in ivory: estimating the age of narwhals (Monodon monoceros) through stochastic modeling of seasonally varying trace elements
Chronicles in ivory: estimating the age of narwhals (Monodon monoceros) through stochastic modeling of seasonally varying trace elements Open
Introduction Age estimation is an important tool for understanding the life history of animal populations, and several techniques have been developed, each with its own strengths and limitations. Methods In this study, we apply a novel age…
View article: A radiocarbon bomb pulse model for estimating the age of North Atlantic cetaceans
A radiocarbon bomb pulse model for estimating the age of North Atlantic cetaceans Open
The tusk of the male narwhal is a prolonged canine tooth, reaching a size of up to 3 m in length. The tusk erupts through the young narwhal’s upper left lip and, over time, develops into an elongated structure composed of dentine growth la…
View article: A time warping model for seasonal data with application to age estimation from narwhal tusks
A time warping model for seasonal data with application to age estimation from narwhal tusks Open
Signals with varying periodicity frequently appear in real-world phenomena, necessitating the development of efficient modelling techniques to map the measured nonlinear timeline to linear time. Here we propose a regression model that allo…
View article: DNA methylation networks underlying mammalian traits
DNA methylation networks underlying mammalian traits Open
Using DNA methylation profiles ( n = 15,456) from 348 mammalian species, we constructed phyloepigenetic trees that bear marked similarities to traditional phylogenetic ones. Using unsupervised clustering across all samples, we identified 5…
View article: Stuck in a corner: Anthropogenic noise threatens narwhals in their once pristine Arctic habitat
Stuck in a corner: Anthropogenic noise threatens narwhals in their once pristine Arctic habitat Open
Niche-conservative species are especially susceptible to changes in their environment, and detecting the negative effects of new stressors in their habitats is vital for safeguarding of these species. In the Arctic, human disturbance inclu…
View article: <scp>DNA</scp> methylation‐based biomarkers for ageing long‐lived cetaceans
<span>DNA</span> methylation‐based biomarkers for ageing long‐lived cetaceans Open
Epigenetic approaches for estimating the age of living organisms are revolutionizing studies of long‐lived species. Molecular biomarkers that allow age estimates from small tissue biopsies promise to enhance studies of long‐lived whales, a…
View article: Physiological responses of narwhals to anthropogenic noise: A case study with seismic airguns and vessel traffic in the Arctic
Physiological responses of narwhals to anthropogenic noise: A case study with seismic airguns and vessel traffic in the Arctic Open
Limited polar geographical range, narrowly defined migratory routes, and deep‐diving behaviours make narwhals exceptionally vulnerable to anthropogenic disturbances including oceanic noise. Although behavioural studies indicate marked resp…
View article: Tusk anomalies in narwhals (Monodon monoceros) from Greenland
Tusk anomalies in narwhals (Monodon monoceros) from Greenland Open
The elongated, spiraled tusk of male narwhals (Monodon monoceros) grows continuously throughout the life of the whale and is most likely a secondary sexual trait used in male–male hierarchical competition and possibly in female mate choice…
View article: Biological parameters in a declining population of narwhals (<i>Monodon monoceros</i>) in Scoresby Sound, Southeast Greenland
Biological parameters in a declining population of narwhals (<i>Monodon monoceros</i>) in Scoresby Sound, Southeast Greenland Open
A decreasing trend in narwhal (Monodon monoceros Linnaeus, 1758) abundance has been identified in a small population in Scoresby Sound, Southeast Greenland. We hypothesize that excessive hunting has affected life history and population dyn…
View article: Combining <i>δ</i><sup>13</sup>C and <i>δ</i><sup>15</sup>N from bone and dentine in marine mammal palaeoecological research: insights from toothed whales
Combining <i>δ</i><sup>13</sup>C and <i>δ</i><sup>15</sup>N from bone and dentine in marine mammal palaeoecological research: insights from toothed whales Open
Stable carbon ( δ 13 C) and nitrogen ( δ 15 N) isotope compositions of bone and dentine collagen extracted from museum specimens have been widely used to study the paleoecology of past populations. Due to possible systematic differences in…
View article: Narwhals react to ship noise and airgun pulses embedded in background noise
Narwhals react to ship noise and airgun pulses embedded in background noise Open
Anthropogenic activities are increasing in the Arctic, posing a threat to niche-conservative species with high seasonal site fidelity, such as the narwhal Monodon monoceros . In this controlled sound exposure study, six narwhals were live-…
View article: Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals Open
One of the last pristine marine soundscapes, the Arctic, is exposed to increasing anthropogenic activities due to climate-induced decrease in sea ice coverage. In this study, we combined movement and behavioral data from animal-borne tags …
View article: Epigenetic predictors of maximum lifespan and other life history traits in mammals
Epigenetic predictors of maximum lifespan and other life history traits in mammals Open
Maximum lifespan of a species is the oldest that individuals can survive, reflecting the genetic limit of longevity in an ideal environment. Here we report methylation-based models that accurately predict maximum lifespan (r=0.89), gestati…
View article: Raw data associated with Current Biology article "Analysis of narwhal tusks reveals life-long feeding ecology and mercury exposure".
Raw data associated with Current Biology article "Analysis of narwhal tusks reveals life-long feeding ecology and mercury exposure". Open
This csv file provides mercury concentrations (ng/g dry weight) and stable isotope (13C and 15N) values for growth layer groups of 10 male narwhal tusks from western Greenland. All data is presented in figures of the manuscript published i…
View article: Population-specific sex and size variation in long-term foraging ecology of belugas and narwhals
Population-specific sex and size variation in long-term foraging ecology of belugas and narwhals Open
Intraspecific variation in resource use by individuals of different age, sex or size may reflect differing energetic requirements and physiological constraints. Males and females often show differences in diet owing to sexual size dimorphi…
View article: Universal DNA methylation age across mammalian tissues
Universal DNA methylation age across mammalian tissues Open
Aging is often perceived as a degenerative process resulting from random accrual of cellular damage over time. Despite this, age can be accurately estimated by epigenetic clocks based on DNA methylation profiles from almost any tissue of t…
View article: RprogramGLMER.R from Narwhals react to ship noise and airgun pulses embedded in background noise
RprogramGLMER.R from Narwhals react to ship noise and airgun pulses embedded in background noise Open
R code for performing the statistical analysis and figure 2
View article: RprogramMemoryComponent.R from Narwhals react to ship noise and airgun pulses embedded in background noise
RprogramMemoryComponent.R from Narwhals react to ship noise and airgun pulses embedded in background noise Open
R code for performing statistical analysis related to estimation of memory component
View article: Some like it cold: Temperature‐dependent habitat selection by narwhals
Some like it cold: Temperature‐dependent habitat selection by narwhals Open
The narwhal ( Monodon monoceros ) is a high‐Arctic species inhabiting areas that are experiencing increases in sea temperatures, which together with reduction in sea ice are expected to modify the niches of several Arctic marine apex preda…
View article: Influence of past climate change on phylogeography and demographic history of narwhals, <i>Monodon monoceros</i>
Influence of past climate change on phylogeography and demographic history of narwhals, <i>Monodon monoceros</i> Open
The Arctic is warming at an unprecedented rate, with unknown consequences for endemic fauna. However, Earth has experienced severe climatic oscillations in the past, and understanding how species responded to them might provide insight int…
View article: The longer the better: evidence that narwhal tusks are sexually selected
The longer the better: evidence that narwhal tusks are sexually selected Open
Once thought to be the magical horn of a unicorn, narwhal tusks are one of the most charismatic structures in biology. Despite years of speculation, little is known about the tusk's function, because narwhals spend most of their lives hidd…
View article: Estimating the Age of West Greenland Humpback Whales Through Aspartic Acid Racemization and Eye Lens Bomb Radiocarbon Methods
Estimating the Age of West Greenland Humpback Whales Through Aspartic Acid Racemization and Eye Lens Bomb Radiocarbon Methods Open
To maintain a sustainable harvest of marine mammals, knowledge on key life history parameters such as age is essential. In West Greenland, humpback whale numbers were low during the 1980s due to past commercial whaling. However, the morato…
View article: Narwhal Genome Reveals Long-Term Low Genetic Diversity despite Current Large Abundance Size
Narwhal Genome Reveals Long-Term Low Genetic Diversity despite Current Large Abundance Size Open
The narwhal (Monodon monoceros) is a highly specialized endemic Arctic cetacean, restricted to the Arctic seas bordering the North Atlantic. Low levels of genetic diversity have been observed across several narwhal populations using mitoch…
View article: Accuracy of the Aspartic Acid Racemization Technique in Age Estimation of Mammals and the Influence of Body Temperature
Accuracy of the Aspartic Acid Racemization Technique in Age Estimation of Mammals and the Influence of Body Temperature Open
The aspartic acid racemization (AAR) technique has been applied for age estimation of humans and other mammals for more than four decades. In this study, eye lenses from 124 animals representing 25 mammalian species were collected and D/L …