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Showing 1 to 20 of 25 for “"cormorant"”.
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The effects of prey availability on the endangered bank cormorant Phalacroxorax neglectus
The bank cormorant Phalacrocorax neglectus is a seabird endemic to the south-western coast of southern Africa and the Benguela Upwelling System and has suffered a decline of more than 50% over three generations. Main threats include displacement by Cape fur seals Arctocephalus pusillus, direct …
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The endangered bank cormorant Phalacrocorax neglectus: the heat is on : understanding the effect of climate change and associated environmental variable changes on the breeding biology and population dynamics of the bank cormorant in the W. C., S. A
The bank cormorant Phalacrocorax neglectus was listed as ‘Endangered’ in 2004, following a decrease of more than 60% in the total population from 1975-2011. It ranges from central Namibia to the Western Cape, South Africa, with most of the population occurring on offshore islands in Namibia. The …
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The impact of cormorants (Phalacrocorax carbo carbo and Phalacrocorax carbo sinensis) on inland fisheries in the UK
Cormorants are piscivorous birds with a daily food intake (DFI) of approximately 500 g. They are a protected species under the Wildlife and Countryside Act 1981. In the UK, the number of over-wintering, inland cormorants increased steadily between 1970 and 1987, at a rate of between 5 and 10 % per …
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Guano Rain and Growing Pain: Co-Nesting Dynamics of Double-Crested Cormorants and Black-Crowned Night-Herons at Tommy Thompson Park
… the co-nesting dynamics between double-crested cormorants (Nannopterum auritum) and black-crowned night-herons (Nycticorax nycticorax) in Tommy Thompson Park, Toronto, Canada, from 1992 to 2023. Linear mixed models with Bayesian inference were used to examine the impacts of cormorant abundance, …
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Effects of temperature on gular fluttering and evaporative water loss in four sympatric cormorants in southern Africa
… behaviour of four species of southern African cormorants, crowned ( Microcarbo coronatus ), Cape ( Phalacrocorax capensis ), bank ( Phalacrocorax neglectus ), and white-breasted ( Phalacrocorax carbolucidus) cormorants. Results show that gular fluttering is influenced by temperature, body …
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Cormorants and the Loch Leven trout fishery
… brown trout Salmo trutta fishery, where Great Cormorants Phalacrocorax carbo have been shot in large numbers. This thesis describes the foraging behaviour of cormorants wintering on Loch Leven. It summarises changes in wintering numbers over a 32 year period, and reviews data on fish …
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Are Cape Cormorants (Phalacrocorax capensis) losing the competition? Dietary overlap with commercial fisheries
… overlap between seabirds and fisheries. The Cape Cormorant Phalacrocorax capensis breeds in the Benguela upwelling region of southern Africa. Its population has decreased by over 50% in the three most recent generations resulting in the species being listed as Endangered in the IUCN Red Data List. …
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Zur Morphologie des Corpus ciliare und seiner Anhangsgebilde im Licht- und Rasterelektronenmikroskop bei verschiedenen Vogelarten
… birds, day-active predatory birds and the cormorant use lenticular accommodation. Their ciliary body therefore contains many elastic fibres, while in night-active predatory birds, which almost exclusively use corneal accommodation, the ciliary body contains almost none. The size of the …
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Stable Isotopes As Intrinsic Markers of Contaminant Dynamics in the Lake Winnipeg Food Web
… Muscle samples from fishes and Double-crested Cormorants (Phalacrocorax auritus; hereafter “cormorant”) were examined isotopically (δ15N, δ13C and δ34S) and the data were used to reconstruct the lake’s food web. The effects of trophic position (TP; δ15N), food source (δ13C and δ34S) and …
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QUANTIFYING DISTURBANCE FACTORS AND EFFECTS IN COMMON TERNS (STERNA HIRUNDO) USING VISUAL, AUDIO, AND REPRODUCTIVE DATA
… to potential disturbances from tern research and cormorant management. Researchers intensively monitor tern nests during the breeding season, and USDA-APHIS participates in a lake-wide hazing program to control double-crested cormorants (Phalacrocorax auritus). The goal of this study was to …
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Pandangan tokoh masyarakat terhadap tradisi perkawinan "dandang rebutan penclok'an": Studi kasus di Desa Tanjunggunung Kec. Peterongan Kab. Jombang
… Kab. Jombang regarding seizure penclok'an cormorant wedding? and How cormorant indigenous struggle developed in the community penclok'an Tanjunggunung village district. Peterongan Kab. Jombang? This study classified empirical research using qualitative descriptive approach, this research …
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The thermal implications and ecological consequences of coloration in selected species : tenebrionid beetles (Onymacris bicolor and Onymacris ungui cularis), Cape gannets (Morus capensis) and Cape cormorants (Phalacrocorax capensis)
… Cape gannets (Morus capensis) and black Cape cormorants (Phalacrocorax capensis ) were measured. Black plumages absorb more visible radiation than white plumages in still conditions. However, laboratory experiments with excised plumages showed that at wind speeds of 2 m s-1, cormorant plumages …
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Impatto del cormorano Phalacrocorax Carbo Sinensis sulle produzioni ittiche delle lagune sarde
… aims to study the feeding habits of the Great Cormorant (Phalacrocorax carbo sinensis, (Blumenbach, 1798), a species wintering in the transitional environments of Sardinia, and to assess the impact of the cormorants colony on fish stocks, considering the different ecological and economic …
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Wildlife Habitat in the James River Valley, South Dakota
… Other observations showed four double-crested cormorant and great blue heron rookeries, several nesting red-tailed and Swainson’s hawks, number valuable dead trees that often formed jams in the river, and a general condition of excessive grazing on the area. The dynamic condition of the river …
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Unifying ecosystem concepts and mercury biomagnification in an estuarine environment using stable isotopes (delta-carbon-13 and delta nitrogen-15).
… two benthivorous fish; and (8) double crested cormorant eggs (whites and yolks). The results of this analysis show that for this coastal ecosystem, no distinction can be made in delta13C and delta15N values between estuarine and marine primary producers and filter-feeding fish, whereas …
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Prevalence and drivers of blood parasitism in African penguins (Spheniscus demersus)
… infection reservoirs, such as the co-occurring cormorant and gannet populations and (2) increasing anthropogenic impacts, especially in mainland colonies. Data on blood parasitism in co-occurring seabird species is required to fully elucidate their role in Babesia infection dynamics in the …
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Space Use by Piscivorous Birds, Fish, and Humans on a Multi-Use Lake in Southern Saskatchewan
… freshwater. In this context, the double-crested cormorant (Phalacrocorax auritus) and American white pelican (Pelecanus erythrorhynchos) have been targeted by anglers based on their diet, which is almost exclusively made up of fish. In contrast, the western grebe (Aechmophorus occidentalis) is a …
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The Environmental Sensitivity of Cold-water Corals Lophelia pertusa
… polyps from a control colony sampled from North Cormorant. It is hypothesised that the NWH coral may have been exposed to dissolved barium released during cuttings resuspension, while barium spikes in the control colony may result from natural fluctuations in seawater barium, thus advocating that …
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Nesting and Boat Disturbance Studies of Colonial Birds in the Okavango Delta, Botswana
… species: African Spoonbill (Plata/ea alba), reed cormorant (Phalacrocorax africanus), purple heron (Ardea purpurea), darter (Anhinga melanogaster), marabou stork (Leptoptilos crumeniferus), and yellow-billed stork (Mycteria ibis). The target species were monitored between July 1993 and March 1994. …
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