Results 51 to 60 of about 8,493 (212)

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

Harbour porpoises (Phocoena phocoena) in the North Atlantic: Biological parameters

NAMMCO Scientific Publications, 2003
Biological parameters for harbour porpoises are reviewed throughout their range in the North Atlantic. Most information is based on studies of a combination of directed catches, bycatches and strandings.
Christina Lockyer
doaj   +1 more source

An Adaptive Threshold in Mammalian Neocortical Evolution

, 2013
Expansion of the neocortex is a hallmark of human evolution. However, it remains an open question what adaptive mechanisms facilitated its expansion.
Huttner, Wieland B, Kalinka, Alex T., Kelava, Iva, Lewitus, Eric, Tomancak, Pavel   +4 more
core   +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

Pathological findings in stranded harbor porpoises (Phocoena phocoena) with special focus on anthropogenic causes

Frontiers in Marine Science, 2022
Humans impact natural systems at an unprecedented rate. The North Sea is one of the regions in the world with the highest levels of anthropogenic activity.
Lonneke L. IJsseldijk, Mardik F. Leopold, Lineke Begeman, Marja J. L. Kik, Lidewij Wiersma, Maria Morell, Elisa L. Bravo Rebolledo, Thierry Jauniaux, Hans Heesterbeek, Andrea Gröne   +9 more
doaj   +1 more source

The role of sand lances (Ammodytes sp.) in the Northwest Atlantic ecosystem: a synthesis of current knowledge with implications for conservation and management [PDF]

, 2020
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Staudinger, M. D., Goyert, H., Suca, J. J., Coleman, K., Welch, L., Llopiz, J.
Altman, Irit, Applegate, Andew, Auster, Peter J., Baumann, Hannes, Beaty, Julia, Boelke, Deirdre, Coleman, Kaycee, Goyert, Holly, Kaufman, Les, Llopiz, Joel K., Loring, Pam, Moxley, Jerry, Paton, Suzanne, Powers, Kevin, Richardson, David E., Robbins, Jooke, Runge, Jeffrey A., Smith, Brian, Spiegel, Caleb, Staudinger, Michelle D., Steinmetz, Halley, Suca, Justin J., Welch, Linda, Wiley, David N.   +23 more
core   +1 more source

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

Will harbour porpoises (Phocoena phocoena) habituate to pingers?

J. Cetacean Res. Manage., 2023
Large bycatches of harbour porpoises (Phocoena phocoena) occur in gillnet fisheries throughout the Northern Hemisphere. Several mitigation measures, including acoustic deterrent devices or ‘pingers’, have been used in efforts to reduce this bycatch. The potential exists for harbour porpoises to habituate to pingers, thus reducing their effectiveness ...
Tara M. Cox, Andrew J. Read, Andrew Solow, Nick Tregenza   +3 more
openaire   +1 more source

Beluga, Delphinapterus leucas, Distribution and Survey Effort in the Gulf of Alaska [PDF]

, 2000
Beluga, Delphinapterus leucas, distribution in the Gulf of Alaska and adjacent inside waters was examined through a review of surveys conducted as far back as 1936.
Laidre, Kristin L., Mahoney, Barbara A., Rugh, David J., Shelden, Kim E. W.   +3 more
core  

Sensory Biology of the Franciscana (Pontoporia blainville, Pontoporiidae, Cetartiodactyla): Ontogenetic Modifications of Vibrissae and Vibrissal Crypts

Integrative Zoology, EarlyView.
The transition of cetaceans from a terrestrial to an aquatic environment involved a crucial sensory adaptation to environments with limited visibility. Vibrissae, important mechanoreceptors, undergo an ontogenetic transformation in odontocetes. This research describes the histomorphology of vibrissae and crypts at different developmental stages ...
Cecilia Mariana Krmpotic, Cleopatra Mara Loza, Alejo Carlos Scarano, Pedro Fernando Andrés‐Laube, Francisco Acuña, Juan Pablo Loureiro, Carolina Natalia Zanuzzi, Nicolás Nahuel Castro, María Teresa Pombo, Lorenzo von Fersen, Claudio Gustavo Barbeito   +10 more
wiley   +1 more source