Results 51 to 60 of about 6,166 (199)

Using Ancient DNA Analysis and Radiocarbon Dating to Determine the Provenance of an Unusual Whaling Artifact

Frontiers in Ecology and Evolution, 2020
Natural history collections provide a critical temporal view of past biodiversity and are instrumental in the study of extinct populations. However, the value of historical specimens relies on correct species identification, collection date and ...
Caitlin Mudge, Rebecca Dallwitz, Bastien Llamas, Jeremy J. Austin   +3 more
doaj   +1 more source

Assessing Cetacean Habitat Suitability in the Northeast Pacific From Citizen Science Data

Journal of Biogeography, EarlyView.
ABSTRACT Aim Citizen science is an important source of biodiversity information, particularly for gathering information on species distributions across large geographic areas. However, there are challenges with spatial and species biases, and variation in effort in citizen science data.
Lauren E. Dares, Chloe V. Robinson
wiley   +1 more source

KILLER WHALE PREDATION ON SPERM WHALES: OBSERVATIONS AND IMPLICATIONS

Marine Mammal Science, 2001
AbstractIn October 1997 we observed a herd of approximately 35 killer whales (Orcinus orca) attack a pod of nine sperm whales (Physeter macrocephalus) 130 km off the coast of central California. During the four hours we watched, adult female killer whales, including some with calves, attacked in waves of four to five animals in what was apparently a ...
Pitman, Robert L., Ballance, Lisa T., Mesnick, Sarah I., Chivers, Susan J.   +3 more
openaire   +2 more sources

Using citizen science photographs to identify reproductive events in an oviparous elasmobranch

Journal of Fish Biology, EarlyView.
Abstract Identifying critical habitats is important for the effective management of vulnerable species. Critical habitats, such as mating or nursery grounds, support populations during key life stages and help to maximise reproductive output and population growth. In elasmobranchs, mating often happens over a defined season, suggesting sites associated
Rachel Mawer, Jane Dodd, James Thorburn, Neil M. Burns, David M. Bailey   +4 more
wiley   +1 more source

How is the third jaw joint in whales different? Diverse modes of articulation between the jaws of whales

Journal of Anatomy, EarlyView.
This study conducts the first comprehensive morphological investigation of the mandibular symphysis in whales. Using gross anatomical observation and CT cross‐sectional data, we describe diverse joint morphologies across 74 extant and fossil cetacean taxa. Toothed whales exhibit unfused, partially fused, or fully fused symphyses.
Rebecca J. Strauch, Nicholas D. Pyenson, Carlos Mauricio Peredo   +2 more
wiley   +1 more source

Depredating sperm whales in the Gulf of Alaska: local habitat use and long distance movements across putative population boundaries

Endangered Species Research, 2014
Satellite tags were attached to 10 sperm whales Physeter macrocephalus (1 whale was tagged in 2 different years) to determine the movements of sperm whales involved in removal of sablefish from longline fishing gear in the Gulf of Alaska (GOA).
JM Straley, GS Schorr, AM Thode, J Calambokidis, CR Lunsford, EM Chenoweth, VM O’Connell, RD Andrews   +7 more
doaj   +1 more source

Investigating Harvest and Vessel Traffic Exposure as Drivers of Social Group Characteristics in Canadian Beluga (Delphinapterus leucas) Populations

Marine Mammal Science, EarlyView.
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, John Iacozza, Lisa Loseto, Cortney A. Watt   +3 more
wiley   +1 more source

Abundance and Distribution of Sperm Whales in the Canary Islands: Can Sperm Whales in the Archipelago Sustain the Current Level of Ship-Strike Mortalities?

PLoS ONE, 2016
Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic.
Andrea Fais, Tim P Lewis, Daniel P Zitterbart, Omar Álvarez, Ana Tejedor, Natacha Aguilar Soto   +5 more
doaj   +1 more source

Characterizing Fraser's Dolphin (Lagenodelphis hosei) in the Lesser Antilles: Distribution, Movements, and Co‐Occurrence With Other Cetacean Species to Inform Conservation Strategies in the Caribbean

Marine Mammal Science, EarlyView.
ABSTRACT Fraser's dolphin (Lagenodelphis hosei) is one of the least studied dolphin species due to its tropical, offshore distribution and low density. However, it is frequently observed in the Lesser Antilles, where we characterized its distribution and ecology using 4 years of data collected from Grenada to Anguilla.
Lucas Bernier, Rocío Prieto González, Christopher Hassall, Valentin Teillard, Jeffrey Bernus   +4 more
wiley   +1 more source

Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea [PDF]

Ocean Science, 2008
In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey exclusively or preferentially on cephalopods. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor ...
E. Praca, A. Gannier
doaj