Results 61 to 70 of about 9,548 (180)
Aspartic acid racemization rate in narwhal (Monodon monoceros) eye lens nuclei estimated by counting of growth layers in tusks [PDF]
Polar Research, 2012 Ages of marine mammals have traditionally been estimated by counting dentinal growth layers in teeth. However, this method is difficult to use on narwhals (Monodon monoceros) because of their special tooth structures.
Eva Garde +3 more
doaj +1 more source
Marine Mammal Science, Volume 41, Issue 4, October 2025.ABSTRACT Assessing variation in social behaviors of group‐living animals may provide insight into the impacts of population stressors. Using very high resolution (VHR) satellite imagery acquired over 3 years, we compared social group size and composition, as well as spatial and social cohesion in three beluga ( Delphinapterus leucas ) populations that ...
Jordan B. Stewart +3 more
wiley +1 more source
Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 35, Issue 9, September 2025.ABSTRACT Rapid warming in the Arctic is causing cumulative impacts on ecosystems, including widespread reduction in sea ice extent, resulting in shifts in primary production, which can have cascading bottom‐up trophic influences on marine food web structure and function. Understanding trophic interactions and the structure of local food webs across the
Reyd Dupuis‐Smith +9 more
wiley +1 more source
A review of age estimation methods in marine mammals with special reference to monodontids
NAMMCO Scientific Publications, 2018 This paper presents a critical review of methods for estimating absolute or relative age in marine mammals. Absolute age is achieved by counting growth layer groups (GLGs) in hard structures such as teeth, ear plugs, baleen, bones and claws. Relative age
Fiona L. Read +2 more
doaj +1 more source
Introducing FAMM: An Open‐Access Database of Fossil Arctic Marine Mammals
Global Ecology and Biogeography, Volume 34, Issue 9, September 2025.ABSTRACT Motivation The Arctic is currently experiencing the strongest effects of climate change on Earth. These effects, including sea ice loss, are already modifying the ecologies of the 11 species of marine mammals found in the Arctic year‐round.
Nicholas A. Freymueller +5 more
wiley +1 more source
Population structure and seasonal movements of narwhals, Monodon monoceros, determined from mtDNA analysis [PDF]
Heredity, 1997 We determined the nucleotide sequence of the first 287 base pairs in the mitochondrial control region from 74 narwhals, Monodon monoceros, collected in the North-west Atlantic. We detected four polymorphic sites that defined five haplotypes, two of which were found in single specimens.
Palsbøll, P. J. +2 more
openaire +4 more sources
Upside-down swimming behaviour of free-ranging narwhals
BMC Ecology, 2007 Background Free-ranging narwhals (Monodon monoceros) were instrumented in Admiralty Inlet, Canada with both satellite tags to study migration and stock separation and short-term, high-resolution digital archival tags to explore diving and feeding ...
Richard Pierre +7 more
doaj +1 more source
Spatial and temporal patterns of sound production in East Greenland narwhals. [PDF]
PLoS ONE, 2018 Changes in climate are rapidly modifying the Arctic environment. As a result, human activities-and the sounds they produce-are predicted to increase in remote areas of Greenland, such as those inhabited by the narwhals (Monodon monoceros) of East ...
Susanna B Blackwell +6 more
doaj +1 more source
A computational framework to characterize and compare the tonal repertoires of toothed whales
Methods in Ecology and Evolution, Volume 16, Issue 7, Page 1350-1368, July 2025.Abstract Toothed whales, despite being one of the most acoustically specialized lineages of vertebrates, lack detailed vocal repertoire characterizations comparable to those of songbirds and primates. Current descriptions often lack standardization, limiting interspecies and intraspecies comparisons critical for understanding the contribution of ...
Maia Austin +7 more
wiley +1 more source
Updates on the Species of Shrimps in Kakkaithivu Coastal Waters, Jaffna Estuary, Sri Lanka
Tropical Agricultural Research, 2015 Shrimps are an important commercial fishery resource and highly diverse group in the world. They are considered a luxury food commodity in international trade and command an excellent market price.
S Piratheepa +2 more
doaj +1 more source