Results 161 to 170 of about 12,801 (205)

Swim speeds of free-ranging great cormorants

Marine Biology, 2006
Information about foraging speeds is particularly valuable when the impact of a predator species upon a community of prey has to be defined, as in the case of great cormorants. We measured the swim speed of 12 (six males and six females) free-ranging great cormorants Phalacrocorax carbo, foraging off the Greenland coast during the summer of 2003, using
Ropert‐coudert, Yan, Grémillet, D., Kato, A.   +2 more
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Late breeding by Great Cormorants Phalacrocorax carbo

Seabird Journal, 2008
Two distinct waves of synchronised breeding occurred at a colony of Great Cormorants Phalacrocorax carbo in west Scotland in 2007. The second wave led to young fledging in September, exceptionally late for this species locally. Evidence from elsewhere suggests that this second wave was not double-brooding (raising of two broods in one year by the same ...
J Craik, T Bregnballe
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Long-Term Changes in Winter Distribution of Danish-Ringed Great Cormorants

Ardea, 2022
We describe long-term changes in the distribution of 2249 freshly dead winter recoveries of 94, 352 Great Cormorant chicks ringed between 1940 and 2018 in Denmark. The entire wintering range was divided into four major compartments to assess changes in (1) migratory distance and (2) the spatial distribution of recoveries. In the south-eastern wintering
Bregnballe, Thomas, Herrmann, Christof, Pedersen, Kjeld Tommy, Wendt, Juliane, Kralj, Jelena, Frederiksen, Morten   +5 more
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Great cormorants (Phalacrocorax carbo) can detect auditory cues while diving

The Science of Nature, 2017
In-air hearing in birds has been thoroughly investigated. Sound provides birds with auditory information for species and individual recognition from their complex vocalizations, as well as cues while foraging and for avoiding predators. Some 10% of existing species of birds obtain their food under the water surface. Whether some of these birds make use
Kirstin Anderson Hansen, Alyssa Maxwell, Ursula Siebert, Ole Næsbye Larsen, Magnus Wahlberg   +4 more
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Evidence of dominant parasympathetic nervous activity of great cormorants (Phalacrocorax carbo)

Journal of Comparative Physiology A, 2009
The characteristics of autonomic nervous activity were examined on captive great cormorants Phalacrocorax carbo hanedae, using a power spectral analysis of heart rate variability. Heart rates were calculated from recordings of the electrocardiograms of the birds via embarked data loggers.
Maki, Yamamoto, Akiko, Kato, Yan, Ropert-Coudert, Masayoshi, Kuwahara, Shinichi, Hayama, Yasuhiko, Naito   +5 more
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DEVELOPMENTAL RATES AND MORPHOMETRICS OF THE SYMPATRIC PYGMY CORMORANT (PHALACROCORAX PYGMEUS) AND GREAT CORMORANT (P. CARBO SINENSIS)

Israel Journal of Zoology, 2003
We compared growth rates and adult morphological traits in two sympatric cormorant species, the pygmy cormorant (Phalacrocorax pygmeus) and the great cormorant (P. carbo sinensis), in Israel. The smaller P. pygmeus exhibited higher developmental rates than P.
MARVA SHMUELI, ZEEV ARAD, GADI KATZIR, IDO IZHAKIb   +3 more
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Status of the Cormorants of Great Salt Lake

The Condor, 1936
often be impossible to go further, but in many winter or summer falcon ranges, accurate identification of pellet material, at least to family or genus may be made, and not rarely to species or even subspecies. The bulk of the feathers in a pellet are usually from head, neck and breast. These feathers may be slightly altered in color, but apparently not
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Nest-Site Limitations and Colony Development in Tree-Nesting Great Cormorants

Waterbirds: The International Journal of Waterbird Biology, 1999
The effects of nesting site availability on colony size were investigated in a Great Cormorant (Phalacrocorax carbo) colony on dead trees in north-East Italy. Trees have collapsed and colony structure has changed in recent years. After a steady increase in size, the breeding colony decreased dramatically as predicted by estimates of potential nesting ...
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In-Air and Underwater Hearing in the Great Cormorant (Phalacrocorax carbo sinensis)

2016
Hearing thresholds of a great cormorant (Phalacrocorax carbo) were measured in air and under water using psychophysics. The lowest thresholds were at 2 kHz (45 dB re 20 μPa root-mean-square [rms] in air and 79 dB re 1 μPa rms in water). Auditory brainstem response measurements on one anesthetized bird in air indicated an audiogram with a shape that ...
Johansen, Sasia, Larsen, Ole Næsbye, Christensen-Dalsgaard, Jakob, Seidelin, Lars, Huulvej, Tina, Helander Jensen, Kristine, Lunneryd, Sven-Gunnar, Boström, Maria, Wahlberg, Magnus   +8 more
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Great Cormorant (Phalacrocorax carbo)

The Birds of North America Online, 2000
Jeremy J. Hatch, Kevin M. Brown, Geoffrey G. Hogan, Ralph D. Morris   +3 more
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