Results 151 to 160 of about 8,417 (229)

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

Oikos, Volume 2026, Issue 6, June 2026.
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

Converting Chemical Signatures in Vaterite Otoliths to Aragonite Otoliths in Steelhead Trout: Developing a Partition Coefficient

, 2017
Otoliths are small bones near the brain of teleost fish that aid in hearing and balance. Otoliths are typically composed of a polymorph of calcium carbonate called aragonite; however, when stressed, fish may transition to producing a less dense polymorph
Justice, Jamie
core  

A Bayesian classification model to reconstruct lifetime movement patterns of riverine fish using environmental tracers

Methods in Ecology and Evolution, Volume 17, Issue 6, Page 1851-1866, June 2026.
Abstract Environmental tracers, including both elemental concentrations and isotope ratios, are widely used to reconstruct the movement patterns of animals throughout landscapes. The methodology involves creating a map that describes the distribution of the environmental tracer across the landscape, an isoscape and then matching the values of the same ...
Michael P. Venarsky, Edward L. Boone, Ben Stewart‐Koster, David A. Crook, Kaitlyn O'Mara, Jon Woodhead, Roland Maas, Stuart Bunn   +7 more
wiley   +1 more source

In Search of the Lost Brown Trout (Salmo trutta Complex) Using DNA of Ancient and Modern Samples From the Southern Italian Peninsula

Evolutionary Applications, Volume 19, Issue 6, June 2026.
ABSTRACT The current diversity and distribution of species and populations have been shaped by the major climatic oscillations during the Quaternary. The brown trout (Salmo trutta) is a striking example of the strong effect of past climate changes on the evolutionary history of species, in fact, the alternation of glacial/interglacial cycles has led to
Tatiana Fioravanti, Andrea Splendiani, Tommaso Righi, Antonio Tagliacozzo, Daniele Albertini, Vincenzo Caputo Barucchi   +5 more
wiley   +1 more source

Evaluating and Advancing the Use of Shore‐Based Observers for Scientific Sampling and Catch Verification in High‐Volume Fisheries

Fisheries Management and Ecology, Volume 33, Issue 3, Page 612-629, June 2026.
ABSTRACT Shore‐based observers are increasingly being used in place of at‐sea observers to monitor and sample commercial fisheries catch. However, few evaluations assess whether these programs meet their stated goals or how to optimize them, and industry data are rarely tested for accuracy despite serving as the foundation for catch accounting. Using a
Christian Gredzens, Andy Kingham, Jason E. Jannot   +2 more
wiley   +1 more source

Revisiting Maturity Data: Using Oocyte Diameter and Gonadosomatic Index to Retroactively Apply a New Maturity Scale to Greenland Halibut (Reinhardtius hippoglossoides)

Fisheries Management and Ecology, Volume 33, Issue 3, Page 601-611, June 2026.
ABSTRACT Greenland halibut (Reinhardtius hippoglossoides) is a deep‐water flatfish which lives at temperatures of 1°C–4°C and produces large eggs (> 3 mm). The combination of low temperatures and large eggs has resulted in an unusual ovary development cycle, with vitellogenesis taking more than 1 year.
James Kennedy, Ásgeir Gunnarsson, Svanhildur Egilsdóttir, Bjarki Þór Elvarsson   +3 more
wiley   +1 more source

Reference collection of Barents Sea capelin (Mallotus villosus) otoliths

, 2011
In 2007 a project was initiated at the Institute of Marine Research, Bergen, with the aim to further develop the methods for age determination of fish by their otoliths, as well as to assure the quality of routine age determination work.
Røttingen, Bente, Alvarez, Jaime
core  

Reliability Assessment of Season-of-Capture Determination from Archaeological Otoliths

, 2003
A technique involving microscopic examination of otolith growth zones has been commonly used by archaeologists along the coast of California to estimate season-of-capture of prehistoric fishes and to infer the season of site use.
Andrews, Allen H., Jones, Terry L., Gobalet, Kenneth W.   +2 more
core  

Comparative Anatomy of Otolithic Organ and Otolith

内耳生化学, 1978
openaire   +1 more source

Steelhead trout otoliths for age, race, and stock analysis

Growth characteristics of otoliths were used to determine age, and to separate known races and stocks of steelhead trout (Salmo gairdneri). Otoliths were the first calcified structures observed in X-ray photographs of steelhead embryos, and a continuous ...
McKern, John L.
core