Results 51 to 60 of about 494 (158)

Longer and less overlapping food webs in anthropogenically disturbed marine ecosystems: confirmations from the past. [PDF]

PLoS ONE, 2014
The human exploitation of marine resources is characterised by the preferential removal of the largest species. Although this is expected to modify the structure of food webs, we have a relatively poor understanding of the potential consequences of such ...
Fabiana Saporiti, Stuart Bearhop, Laura Silva, Damián G Vales, Lisette Zenteno, Enrique A Crespo, Alex Aguilar, Luis Cardona   +7 more
doaj   +1 more source

Marine trophic architecture and hidden ecological connections in the Strait of Magellan: keystone species and ecosystem resilience

Oikos, Volume 2026, Issue 4, April 2026.
Understanding the ecological implications of species coexistence is central to biodiversity studies and to identify environmental and anthropogenic drivers of ecosystem dynamics, where ecological network analysis offers valuable insights. This study examines the complexity, structure, and potential responses to disturbances of the Strait of Magellan's ...
Claudia D. Andrade, Taryn Sepúlveda, Cristóbal Rivera, Cristian Aldea, Tomás I. Marina   +4 more
wiley   +1 more source

Estimates of Oil-Soaked Carcasses of the Magellanic Penguin (Spheniscus magellanicus) on the eastern shore of Península Valdés, Chubut Province, Argentina

El Hornero, 1990
This article does not have an abstract.
Ronald M. Knaus
doaj   +1 more source

How often should dead-reckoned animal movement paths be corrected for drift?

Animal Biotelemetry, 2021
Background Understanding what animals do in time and space is important for a range of ecological questions, however accurate estimates of how animals use space is challenging. Within the use of animal-attached tags, radio telemetry (including the Global
Richard M. Gunner, Mark D. Holton, David M. Scantlebury, Phil Hopkins, Emily L. C. Shepard, Adam J. Fell, Baptiste Garde, Flavio Quintana, Agustina Gómez-Laich, Ken Yoda, Takashi Yamamoto, Holly English, Sam Ferreira, Danny Govender, Pauli Viljoen, Angela Bruns, O. Louis van Schalkwyk, Nik C. Cole, Vikash Tatayah, Luca Börger, James Redcliffe, Stephen H. Bell, Nikki J. Marks, Nigel C. Bennett, Mariano H. Tonini, Hannah J. Williams, Carlos M. Duarte, Martin C. van Rooyen, Mads F. Bertelsen, Craig J. Tambling, Rory P. Wilson   +30 more
doaj   +1 more source

MHC Diversity and Mate Choice in the Magellanic Penguin, Spheniscus magellanicus [PDF]

Journal of Heredity, 2012
We estimated levels of diversity at the major histocompatibility complex (MHC) class II DRß1 gene in 50 breeding pairs of the Magellanic penguin and compared those to estimates from Humboldt and Galapagos penguins. We tested for positive selection and 2 conditions required for the evolution of MHC-based disassortative mating: 1) greater MHC diversity ...
Gabrielle J, Knafler, J Alan, Clark, P Dee, Boersma, Juan L, Bouzat   +3 more
openaire   +2 more sources

Dead-reckoning animal movements in R: a reappraisal using Gundog.Tracks

Animal Biotelemetry, 2021
Background Fine-scale data on animal position are increasingly enabling us to understand the details of animal movement ecology and dead-reckoning, a technique integrating motion sensor-derived information on heading and speed, can be used to reconstruct
Richard M. Gunner, Mark D. Holton, Mike D. Scantlebury, O. Louis van Schalkwyk, Holly M. English, Hannah J. Williams, Phil Hopkins, Flavio Quintana, Agustina Gómez-Laich, Luca Börger, James Redcliffe, Ken Yoda, Takashi Yamamoto, Sam Ferreira, Danny Govender, Pauli Viljoen, Angela Bruns, Stephen H. Bell, Nikki J. Marks, Nigel C. Bennett, Mariano H. Tonini, Carlos M. Duarte, Martin C. van Rooyen, Mads F. Bertelsen, Craig J. Tambling, Rory P. Wilson   +25 more
doaj   +1 more source

Adaptive Genetic Variation in Black‐and‐White Snub‐Nosed Monkeys (Rhinopithecus bieti): Low Diversity and the Role of Balancing Selection

Ecology and Evolution, Volume 16, Issue 3, March 2026.
We investigated the adaptive genetic diversity within a population of Rhinopithecus bieti using amplicon sequencing. From 47 individuals, we identified 16 MHC class I sequences, revealing a low level of adaptive genetic variation. Although evidence for balancing selection, including positive selection and trans‐species polymorphism, was observed, these
Fei Long, Mei‐Jing Ying, Tian‐Qi Shi, Paul A. Garber, Ru‐Liang Pan, Jian‐Dong Lai, Zhi‐Pang Huang, Bao‐Guo Li, Pei Zhang   +8 more
wiley   +1 more source

Compound-specific stable isotope analyses in Falkland Islands seabirds reveal seasonal changes in trophic positions

BMC Ecology, 2020
Background While nitrogen and carbon stable isotope values can reflect ecological segregation, prey choice and spatial distribution in seabirds, the interpretation of bulk stable isotope values is frequently hampered by a lack of isotopic baseline data ...
Petra Quillfeldt, Juan F. Masello
doaj   +1 more source

Swimming modes affect dive durations in diving birds

Journal of Avian Biology, Volume 2026, Issue 2, March 2026.
Dive duration and body mass are positively correlated across air‐breathing vertebrate species, but other factors affecting dive duration are inadequately studied. Here, we examined the effect of a previously overlooked factor, swimming mode, using phylogenetically informed statistics with data on the diving capabilities of 53 species of avian divers ...
Hiroya Matsushita, Yuuki Y. Watanabe
wiley   +1 more source

Sustainable Tourism and Conservation: A Study of the Impact of Tourism on Magellanic Penguins Spheniscus magellanicus in Patagonia, Argentina

Journal of Zoological and Botanical Gardens
The impact of tourism on Magellanic penguins (Spheniscus magellanicus) in Patagonia is a complex issue that requires a balanced approach between conservation and sustainable tourism development.
Marcelo Bertellotti, Verónica D’Amico
doaj   +1 more source