Results 51 to 60 of about 2,821 (239)

Up-beat motion in swimming limbs: New insights into assessing movement of free-living marine vertebrates. [PDF]

open access: yes, 2003
A new system is presented for assessing the movement of animal limbs including, after suitable calibration, quantification of limb stroke frequency and amplitude, which may be used to derive limb angular velocity and acceleration.
Liebsch, Nikolai, Wilson, Rory P.
core   +1 more source

Mercury levels in feathers of Magellanic penguins

open access: yesMarine Pollution Bulletin, 2012
Feathers are useful to determine mercury (Hg) contamination. We evaluated the mercury concentration in feathers of Magellanic penguins (Spheniscus magellanicus) age 1.5 years to 25 years at Punta Tombo, Argentina before and during their molt. Mercury ranged between
Frías, Jorgelina E.   +6 more
openaire   +3 more sources

Pollution, habitat loss, fishing and climate change as critical threats to penguins [PDF]

open access: yes, 2014
Cumulative human impacts across the world’s oceans are considerable. We therefore examined a single model taxonomic group, the penguins (Spheniscidae), to explore how marine species and communities might be at risk of decline or extinction in the ...
Boersma, P. Dee   +16 more
core   +4 more sources

Tangled and drowned: a global review of penguin bycatch in fisheries

open access: yesEndangered Species Research, 2017
Penguins are the most threatened group of seabirds after albatrosses. Although penguins are regularly captured in fishing gear, the threat to penguins as a group has not yet been assessed.
Crawford, R   +28 more
doaj   +1 more source

Foraging behaviour and reproductive success in Magellanic penguins (Sphensicus magellanicus): a comparative study of two colonies [PDF]

open access: yes, 1999
During the breeding season 1996/97 we compared the foraging and diving behaviour of adult Magellanic penguins (Spheniscus magellanicus), growth rates of their chicks and their breeding success at two colonies in the south of Chile. One of the colonies is
Culik, Boris M., Radl, A.
core   +1 more source

The evolution of seabirds in the Humboldt Current: new clues from the Pliocene of Central Chile.

open access: yesPLoS ONE, 2014
BackgroundDuring the last decade, new Neogene fossil assemblages from South America have revealed important clues about the evolution of seabird faunas in one of the major upwelling systems of the world: the Humboldt Current. However, most of this record
Martín Chávez Hoffmeister   +2 more
doaj   +1 more source

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

open access: yesPLoS 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   +7 more
doaj   +1 more source

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

open access: yesOikos, EarlyView.
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   +4 more
wiley   +1 more source

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

open access: yesAnimal 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   +30 more
doaj   +1 more source

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