Results 61 to 70 of about 5,976 (206)

Defining management units for cetaceans by combining genetics, morphology, acoustics and satellite tracking

Global Ecology and Conservation, 2015
Managing animal units is essential in biological conservation and requires spatial and temporal identification of such units. Since even neighbouring populations often have different conservation status and face different levels of anthropogenic pressure,
Signe Sveegaard, Anders Galatius, Rune Dietz, Line Kyhn, Jens C. Koblitz, Mats Amundin, Jacob Nabe-Nielsen, Mikkel-Holger S. Sinding, Liselotte W. Andersen, Jonas Teilmann   +9 more
doaj   +1 more source

First Evidence of Retrospective Findings of Microplastics in Harbour Porpoises (Phocoena phocoena) From German Waters

Frontiers in Marine Science, 2021
Microplastic ingestion by lower trophic level organisms is well known, whereas information on microplastic ingestion, egestion and accumulation by top predators such as cetaceans is still lacking.
Carolin Philipp, Bianca Unger, Sonja M. Ehlers, Sonja M. Ehlers, Jochen H. E. Koop, Jochen H. E. Koop, Ursula Siebert   +6 more
doaj   +1 more source

Temporal changes in the dietary niche of sympatric seals provides insight into the role of competition in population declines

Oikos, EarlyView.
Competition theory suggests that interspecific prey competition can result in changes to the dietary niche, but obtaining timeseries of data from sympatric species experiencing temporal variation in competition is challenging. Scotland is an important area for two species of seals, but over the past 20 years, populations of harbour seals Phoca vitulina
Izzy Langley, Philip S. Hammond, Paul M. Thompson, Graham J. Pierce, Lindsay J. Wilson, Ailsa J. Hall, Gordon D. Hastie, Debbie J. F. Russell   +7 more
wiley   +1 more source

Testicular morphology and spermatogenesis in harbour porpoises (Phocoena phocoena) [PDF]

Theriogenology, 2019
Knowledge about reproductive parameters in male harbour porpoises such as testicular histology and germ cell maturation as well as seasonal changes in spermatogenesis is scarce. Thus, the aim of the present study was to report changes in the histological appearance of the testicular morphology of neonatal and juvenile harbour porpoises during ...
Kesselring, T, Viquerat, S, IJsseldijk, L L, Langeheine, M, Wohlsein, P, Gröne, A, Bergmann, M, Siebert, U, Brehm, R   +8 more
openaire   +3 more sources

Programmed unmanned aerial vehicles show great potential for monitoring marine megafauna in specific areas of interest

Remote Sensing in Ecology and Conservation, EarlyView.
Targeted conservation measures are contingent on robust knowledge of spatio‐temporal animal distribution in areas of interest. We explore unmanned aerial vehicle (UAV) transect monitoring as a novel method for standardized digital aerial surveys of marine megafauna by investigating the fine‐resolution spatio‐temporal distribution of harbour porpoises ...
Dinah Hartmann, Valdemar Palmqvist, Johanna Stedt   +2 more
wiley   +1 more source

Harbour porpoise responses to pile-driving diminish over time [PDF]

Royal Society Open Science, 2019
Estimating impacts of offshore windfarm construction on marine mammals requires data on displacement in relation to different noise levels and sources. Using echolocation detectors and noise recorders, we investigated harbour porpoise behavioural responses to piling noise during the 10-month foundation installation of a North Sea windfarm.
Isla M. Graham, Nathan D. Merchant, Adrian Farcas, Tim R. Barton, Barbara Cheney, Saliza Bono, Paul M. Thompson   +6 more
openaire   +5 more sources

Severe Hearing Loss in the World's First Successfully Captive‐Born Yangtze Finless Porpoise: Impact of High Underwater Sound Exposure and Congenital Hearing Disorders

Integrative Zoology, EarlyView.
The audiogram of the world's first successfully captive‐born Yangtze finless porpoise was on average 40 dB higher than conspecifics. Congenital hearing disorders and noise exposure may be the primary cause of porpoise's hearing loss. ABSTRACT Aquariums globally have seen significant growth in recent decades.
Zhitao Wang, Tomonari Akamatsu, Kexiong Wang, Ding Wang   +3 more
wiley   +1 more source

A review of methods for defining population structure in the harbour porpoise (Phocoena phocoena)

NAMMCO Scientific Publications, 2003
Wide-ranging methods that have been used to determine population structure, including distribution, life history, biology, ecological factors such as diet and contaminant loads, morphology and genetics, are reviewed.
Christina Lockyer
doaj   +1 more source

Microhaplotype Methods Enable Relationship Inference in a Bottlenecked Mammalian Species

Animal Conservation, EarlyView.
Northern elephant seals (Mirounga angustirostris) are among the most genetically depauperate mammals in the world. A near‐total population bottleneck in the 19th century, coupled with the breeding system of extreme polygyny, has challenged efforts to estimate individual reproductive success with genetic methods.
Keith M. Hernandez, Anthony J. Clemento, Juliette E. Linossier, Daniel E. Crocker, Daniel P. Costa, Colleen Reichmuth, John Carlos Garza   +6 more
wiley   +1 more source

Influence of environmental variability on harbour porpoise movement [PDF]

Marine Ecology Progress Series, 2020
The harbour porpoisePhocoena phocoenais a small marine predator with a high conservation status in Europe and the USA. To protect the species effectively, it is crucial to understand its movement patterns and how the distribution of intensively used foraging areas can be predicted from environmental conditions.
Stalder, Dominique, van Beest, Floris, Sveegaard, Signe, Dietz, Rune, Teilmann, Jonas, Nabe-Nielsen, Jacob   +5 more
openaire   +2 more sources