Relevant bibliographies by topics / Cormorant

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Academic literature on the topic 'Cormorant'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Cormorant"

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Muzaffar, Sabir Bin, Robert Gubiani, Sonya Benjamin, Rashid AlShihi, Ahmad Al-Romithi, and Faisal Humaid Al Kaabi. "Food consumption patterns of the Vulnerable Socotra cormorant Phalacrocorax nigrogularis indicate minimal overlap with fisheries in the eastern Arabian Gulf." Oryx 51, no. 1 (October 8, 2015): 115–23. http://dx.doi.org/10.1017/s0030605315000666.

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AbstractHistorically cormorants have come into direct conflict with fisheries because of their feeding habits. The Socotra cormorant Phalacrocorax nigrogularis is a regionally endemic seabird restricted to the Arabian Gulf and coastal Oman, and is categorized as Vulnerable on the IUCN Red List. The species is perceived as being detrimental to local fisheries and is therefore persecuted. We studied the diet and estimated the number of Socotra cormorants breeding on Siniya Island, Umm Al Quwain, United Arab Emirates, to determine their impact on local fisheries. Regurgitated fish loads were collected during the breeding seasons of 2011–2012 and 2012–2013, and the biomass of fish consumed by the Socotra cormorant population was estimated. The diet comprised seven species of fish, with sailfin flying fish Parexocoetus mento and blue-stripe sardine Herklotsichthys quadrimaculatus dominating in 2011–2012 and anchovies (Encrasicholina spp.) dominating in 2012–2013. Biomass of fish loads was higher in 2011–2012 compared to 2012–2013, although mean biomass of fish loads did not differ. Dominant fish species in the cormorant's diet were either used as baitfish or were non-target species in the fisheries. The low overlap between the diet of the Socotra cormorant and the fish landed by the fisheries suggests that the cormorant's impact on fisheries is minimal. Conservation strategies to protect the birds and their feeding areas could safeguard populations of this species from further declines.
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VOORBERGEN, ANNE, WILLEM F. DE BOER, and LES G. UNDERHILL. "Natural and human-induced predation on Cape Cormorants at Dyer Island." Bird Conservation International 22, no. 1 (March 2012): 82–93. http://dx.doi.org/10.1017/s0959270912000032.

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SummaryTo develop conservation strategies for vulnerable seabird species that need attention, it is important to know which factors influence their breeding productivity. Predation of eggs and chicks can have large influences on seabird reproduction, especially when human disturbance facilitates predation. On Dyer Island, Kelp GullsLarus dominicanusprey on Cape CormorantPhalacrocorax capensiseggs and chicks, whereas Cape fur sealsArctocephalus pusillus pusillusprey on Cape Cormorant fledglings in the waters surrounding the island. Kelp Gulls were estimated to predate 3.8% of the total number of Cape Cormorant eggs and 2.0% of the chicks on the island. These percentages can be expressed as a loss of 4.8% of Cape Cormorant fledglings, which is low compared to the estimated 24.3% mortality of Cape Cormorant fledglings by Cape fur seal predation. Human disturbance facilitated Kelp Gull egg and chick predation and increased the mobbing of cormorant fledglings by Kelp Gulls. Cormorant egg predation by gulls was more frequently reported in the late afternoon. Seal predation was more abundant at the northern side of the island compared to the southern side, was recorded more frequently in the morning, and increased through the breeding season. The altered abundance and distribution of prey, the availability of suitable breeding habitat and mortality from avian cholera, have also influenced the Cape Cormorant’s population size. Hence, the possibility that Cape Cormorants may be locked in a predator-pit, where seals and gulls prevent the population from increasing in size, needs further attention.
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Bugajski, Aleksandra, Matthew W. Reudink, Jennifer L. Doucette, Samantha E. Franks, Björn Wissel, and Christopher M. Somers. "The complexity of cormorants: stable isotopes reveal multiple prey sources and feeding site switching." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 2 (February 2013): 271–79. http://dx.doi.org/10.1139/cjfas-2012-0237.

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Conflict between cormorants (Phalacrocorax spp.) and humans over fisheries is currently one of the most widespread wildlife management issues in the world. Cormorant impact assessments typically assume a single source of prey near the breeding colony. However, cormorants can fly long distances (>20 km), resulting in fish removal from multiple areas. Knowledge of the source of cormorant prey is critical for fisheries impact assessments. Carbon and nitrogen stable isotopes values from fish in double-crested cormorant (Phalacrocorax auritus) regurgitations revealed several prey sources for breeding birds in north-central Saskatchewan, Canada. Cormorants also switched feeding locations on a daily and seasonal basis. Foraging patterns inferred by stable isotope analysis closely paralleled observations of relative cormorant densities on different lakes. Up to 80% of prey came from areas well removed from the breeding colony lake (≤30 km). Cormorant foraging ecology can be complex and may be driven by factors independent of breeding colony site selection. The approach of estimating biomass removal from breeding colony lakes as the guideline for management decisions may be invalid in many locations.
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Jepsen, Niels, Reinhard Klenke, Per Sonnesen, and Thomas Bregnballe. "The use of coded wire tags to estimate cormorant predation on fish stocks in an estuary." Marine and Freshwater Research 61, no. 3 (2010): 320. http://dx.doi.org/10.1071/mf09038.

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One of the main obstacles to resolving the conflict between an increasing population of cormorants, Phalacrocorax carbo sinensis, and the fishing industry is the lack of documentation of the effect of the birds’ predation on fish stocks. Tagging and releasing fish with coded wire tags followed by intensive cormorant pellet sampling may be a viable method to measure the impact of cormorants on fish populations. To test this new method, we studied cormorant predation in a shallow estuary, where nearly 100 000 fish were tagged and more than 10 000 cormorant pellets were collected over a 3-year study period. A total of 112 tags were recovered from the collected pellets. Analyses of tag recovery data indicated considerable cormorant predation on tagged flounder, eel and salmon smolts, but the method did not deliver high-quality documentation, mainly because of limitations in pellet sampling. We conclude with recommendations to enhance the value of this method.
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Heikinheimo, Outi, Pekka Rusanen, and Katja Korhonen. "Estimating the mortality caused by great cormorant predation on fish stocks: pikeperch in the Archipelago Sea, northern Baltic Sea, as an example." Canadian Journal of Fisheries and Aquatic Sciences 73, no. 1 (January 2016): 84–93. http://dx.doi.org/10.1139/cjfas-2015-0033.

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Estimates of the mortality rates caused by cormorants are needed to assess the impact on fish stock dynamics and fisheries. In this study, we calculated the annual instantaneous mortality caused by great cormorants (Phalacrocorax carbo sinensis) on young pikeperch (Sander lucioperca), using data from Archipelago Sea, southwestern coast of Finland. The pikeperch are vulnerable to cormorant predation mainly at the ages 2–4. The annual instantaneous mortality caused by cormorants was between 0.04 and 0.13, and the estimated effect on the pikeperch stock size at recruitment to the fishery ranged from 4% to 23%, respectively. The average annual cormorant-induced mortality accounted for 5%–34% of the total mortality in these age groups. The sensitivity analyses proved that the rates of mortality from other sources largely affect the estimated mortality from cormorant predation. In cases with strong fluctuations in the abundance of the prey fish stocks, ignoring the size and density dependence of the natural mortality may lead to overestimation of the importance of cormorants as competitors of fisheries.
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Vizi, Andrej, and Ondrej Vizi. "Changes in the diet composition of Pygmy Cormorant Phalacrocorax pygmeus on Skadar lake (Southern Montenegro)." Acrocephalus 31, no. 144 (October 1, 2010): 21–26. http://dx.doi.org/10.2478/v10100-010-0003-8.

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Changes in the diet composition of Pygmy Cormorant Phalacrocorax pygmeus on Skadar lake (Southern Montenegro) Diet changes of Pygmy Cormorant Phalacrocorax pygmeus, a piscivorous bird feeding primarily on fish up to 15 cm long, were studied on Skadar Lake. The breeding population on the lake was estimated at over 2,000 pairs in 2005 and 1,260 pairs in 2006, comprising about 5-8% of the regional population of SE Europe & Turkey. The first diet analysis, based on stomach contents of specimens hunted in the course of the breeding season, was carried out in the period 1973-1975 in order to identify the influence of the birds on commercial fishery. Further samples of regurgitated or accidentally dropped food items during the feeding of nestlings were collected and analyzed in the 2006 breeding season. Results from both periods are presented and changes in diet composition in the course of over 30 years are discussed. Between 1973-1975 and 2006, the Pygmy Cormorant's diet on Skadar Lake changed drastically. Only one fish species, Rudd Scardinius knezevici, was found to be common to both study periods. Pygmy Cormorant's diet in the period 1973-1975 consisted of 11 fish species (N = 224 specimens), belonging to five families. The most abundant fish species were Roach Rutilus ohridanus and Albanian Roach Pachychilon pictum. Diet analysis in 2006 revealed only six species (N = 98 specimens) from two families, and also showed that the introduced Goldfish Carassius auratus became a major food source for Pygmy Cormorant, constituting 84.7% of the total specimen number. Age class analysis of Goldfish items revealed that juvenile specimens (45-90 mm) comprised 89.0% of the total Goldfish compound. The study confirms that the Pygmy Cormorant is not a species-specific hunter and suggests it is not affected by the changes in composition of fish community in the littoral zone of the lake. Fish consumption by Pygmy Cormorants on Skadar Lake in 2006 was estimated at 45 t during the most intensive foraging period (June-August).
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Källander, Hans. "The kleptoparasitic and commensal association of Dalmatian Pelicans Pelecanus crispus with Great Cormorants Phalacrocorax carbo." Ornis Svecica 30 (January 25, 2020): 5–12. http://dx.doi.org/10.34080/os.v30.20265.

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The association between Dalmatian Pelicans Pelecanus crispus and Great Cormorants Phalacrocorax carbowas studied at three Greek sites, Megali Prespa, Kerkini and Karla. At Prespa, the two species seemed to use each other mutually: pelicans benefited from fish that tried to escape from the cormorants by swimming towards the surface while cormorants used the pelicans as a cue to the presence of fish shoals. When a pelican flew towards a cormorant, other cormorants immediately flew there and dived instantly. The association usually was very brief lasting only a mean of circa 114 s. Pelicans mostly foraged singly or in small groups (mean 3.2 individuals) and often there were also few cormorants (median 6). Kleptoparasitism was recorded at all three sites, but at Kerkini and Karla, pelicans associated with the huge fishing flocks of cormorants and predominantly kleptoparasitized them. Around 20% of attacks were successful. Thirty-one attacks were very violent with the pelican holding the cormorant until it dropped its fish.
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Sidorenko, A. I. "ГНІЗДОВА БІОЛОГІЯ ТА ПРОСТОРОВИЙ РОЗПОДІЛ БАКЛАНА ВЕЛИКОГО (PHALACROCORAX CARBO)." Biological Bulletin of Bogdan Chmelnitskiy Melitopol State Pedagogical University 5, no. 03 (October 28, 2015): 32–41. http://dx.doi.org/10.15421/2015026.

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<p>We studied the breeding ecology of the Great Cormorant on Obytichna spit (Prymorskyi district, Zaporizhia region) in 2015. We analyzed the dynamics of the number of cormorants, characteristics of breeding habitats, and breeding phenology since 1983. The structure of nesting colony, the size of clutches and the daily activity of the cormorants were also studied. We analyzed the breeding densities, height of trees and patern of nest location, and the size of clutches.</p> <p><em>Keywords</em>: Great Cormorant (<em>Phalacrocorax carbo</em>), Obytichna spit, colony structure, breeding ecology.</p>
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Dalton, Christopher M., David Ellis, and David M. Post. "The impact of double-crested cormorant (Phalacrocorax auritus) predation on anadromous alewife (Alosa pseudoharengus) in south-central Connecticut, USA." Canadian Journal of Fisheries and Aquatic Sciences 66, no. 2 (February 2009): 177–86. http://dx.doi.org/10.1139/f08-198.

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The decline of anadromous alewife ( Alosa pseudoharengus ) threatens an important recreational and commercial fishery. While the cause of this decline is uncertain, predators could be trapping alewives at low abundance by preying on them during spawning migrations. Here we investigate the impact of predation by double-crested cormorants ( Phalacrocorax auritus ) on spawning adult alewives in south-central Connecticut, USA. We use a bioenergetic model together with estimates of cormorant diets and cormorant and alewife population sizes to estimate the consumption of alewives by cormorants both in Bride Lake, Connecticut, and regionally. We find that cormorants are important predators of spawning adult alewives at Bride Lake but do not have a notable impact on alewife mortality or population size. We also find that cormorants have little effect on alewife populations across south-central Connecticut because few alewives are consumed away from Bride Lake. We conclude that cormorants are important predators for anadromous alewives, but do not pose an immediate threat to the recovery of regional alewife stocks.
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Traczuk, Piotr, and Andrzej Kapusta. "Great cormorant (Phalacrocorax carbo) predation on pikeperch (Sander lucioperca L.) in shallow eutrophic lakes in Poland." Archives of Polish Fisheries 25, no. 2 (June 1, 2017): 123–30. http://dx.doi.org/10.1515/aopf-2017-0012.

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AbstractIncreases in the population abundance of the piscivorous great cormorant (Phalacrocorax carbo) has led to conflicts with fisheries. Cormorants are blamed for decreased fish catches in many lakes in Poland. The aim of this paper is to describe to role of pikeperch (Sander lucioperca) in the diet of cormorants nesting in a colony on the island in Lake Warnołty. Since the breeding colony is located in the vicinity of Lake OEniardwy, the largest lake in Poland, the cormorants use the resources in this lake. In 2009-2016, 18,432 regurgitated fish were collected, of which 593 were pikeperch. The share of pikeperch among fish collected in 2009-2012 did not exceed 2%, but from 2013 this increased substantially to maximum of 38.2% in 2015. The smallest pikeperch had a standard length of 8.4 cm, and the largest 42.5 cm. Pikeperch mean length differed by year, and the length distribution was close to normal. The sizes of the regurgitated pikeperch indicate that cormorants prey almost exclusively on juvenile specimens. The results of the present study indicate that cormorant predation has a significant impact on pikeperch populations in lakes in the vicinity of the colony, and the great cormorants are possibly a significant factor in the effectiveness of pikeperch management. When planning for the management of fish populations in lakes subjected to cormorant predation pressure, it should be borne in mind that predation by this piscivorous bird species impacts the abundance and size-age structure of fish populations.
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Dissertations / Theses on the topic "Cormorant"

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Winney, Bruce Joseph. "Cormorant population genetics and Turaco phylogenetics." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285767.

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Engström, Henri. "Effects of Great Cormorant Predation on Fish Populations and Fishery." Doctoral thesis, Uppsala University, Department of Evolutionary Biology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1506.

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The strong increase in number of Great cormorants Phalacrocorax carbo in Sweden in recent years has led to conflicts - particularly with fishery. This thesis focuses on the possible effects of cormorant predation on fish populations. In total, data from 15 lakes in South Sweden were included in this study while most studies were carried out in Lake Ymsen. The results suggest that the impact of cormorant predation on natural fish populations was small, and I observed no decline in fish mass after cormorants established. Cormorant predation on eel was difficult to evaluate because of several confounding factors.

Ruffe, roach and perch were the most important prey species to the cormorants and most fish taken were small. Cormorants do not seem to catch species and sizes in proportion to their occurrence in the fish community.

Total fish removal by cormorants varied considerably among lakes (0.2-15.0 kg/ha) and cormorant population sizes at the different lakes were significantly positively correlated with fishery catches, which in turn was significantly positively correlated with total phosphorous levels. Thus, cormorant densities in lakes, and perhaps elsewhere, seem to be governed chiefly by fish densities. The fact that cormorant predation appears not to reduce fish densities suggest cormorants to be regulated by other means than prey depletion. The mechanism behind population regulation could be a behavioural response of fish, making fish more difficult to catch for the cormorants.

In recent years, cormorant populations have been subjected to intensive legal and illegal actions with the aim to reduce cormorant numbers. However, the actions currently carried are well below the efforts needed to limit population sizes. To conclude, cormorants appear to compete little with fishery, with regards to free-living fish. The main problem is that cormorants sometimes damage and take away fish in fishing gears.

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Engström, Henri. "Effects of great cormorant predation on fish populations and fishery /." Uppsala : Acta Universitatis Upsaliensis : Univ-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5164-0/.

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Botha, Philna. "The effects of prey availability on the endangered bank cormorant Phalacroxorax neglectus." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/12823.

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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 human disturbance, pollution, climate change and food shortage. This thesis focuses on the bank cormorant’s response to food shortage, both directly and indirectly. Four colonies (Jutten Island, Dassen Island, Robben Island and Stony Point) were studied in terms of responses on population level in relation to the spatial distribution of prey surrounding the various colonies, foraging behaviour and breeding success. First, I tested the response of the bank cormorant ’ s population dynamics in relation to the availability of West Coast rock lobster Jasus lalandii in different spatial scales around three colonies (Jutten Island, Dassen Island and Stony Point) over a subset of years. I found that birds at Dassen Island showed the strongest response to the availability of rock lobster. Birds also showed strongest response to the availability of rock lobster in an accumulative distance around colonies, and their largest response was to rock lobster within 30 km distance from the colony. Various aspects including the life - history traits and moulting stages of this particular rock lobster species may be the reason to this response. Second, I present foraging effort data of bank cormorants in localities known to be situated in areas with different prey availability. I found that at Jutten Island, situated in an area where West Coast rock lobster have dramatically decreased, bank cormorants spent significantly longer time at sea than at Robben Island and Stony Point, which were situated in areas where rock lobster were known to be abundant at the time of the study. Third, I tested the effect of food availability on the breeding success of bank cormorants at Jutten Island, Robben Island and Stony Point. There was no significant relationship between food availability and the survival probability of the birds. The number of chicks fledged per successful nest, however was significantly related to the availability of rock lobster during the relevant breeding season, as well as during the relevant month of hatching.
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BUTTU, SIMONE. "Impatto del cormorano Phalacrocorax Carbo Sinensis sulle produzioni ittiche delle lagune sarde." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266568.

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The work 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 aspects. During the 2012-2015 period, several monitoring and censuses were carried out, in order to assess and identify the roost or feeding areas with the largest number of cormorants in the different lagoons examined. Numerically, during the three years was observed a significant increase in the number of individuals (rk, p <0.05), which was more than 40% between the first monitoring conducted in 2012 and those 2014. Indeed, in December 2011 was recorded a peak of 9637 animals while in December 2014, there were 13536 individuals. A total of 1402 bird flocks of Great Cormorant wintering in the Cabras and Mistras lagoons (central-western Sardinia), in the S'Ena Arrubia lagoon (southeast of Oristano), in the Sant'Antioco lagoon (south-west Sardinia), in the Santa Gilla lagoon (near to Cagliari), in the Colostrai lagoon (southeastern coast of Sardinia), in the Sa Praia pond (south-east coast of Sardinia) were analysed. Through the morphological analysis of undigested hard structures, such as otoliths, it was possible to describe the preyed species, their size and biomass and, thus, the average daily consumption of cormorants. The trophic spectrum was dominated almost exclusively by euryhaline, gregarious fish species. Mugilidae, and particularly Liza ramada, were the most important prey with a very high percentage index of relative importance (%IRI). The average Daily Food Intake (D.F.I.) for the different lagoons examined was estimated to be equal to 386.8. ± 31 g / day. Specifically, the highest daily requirement was found in the Cabras lagoon with a value of 478.4. ± 18 g / day (Buttu et al., 2013a). The overall amount of biomass preyed by the cormorants during the entire wintering season was estimated over 500 tons. The results obtained by the model applied to a predation economically and ecologically acceptable, specifically, indicate that predation in the Cabras lagoon is outside of economically sustainable levels. This kind of study represent a fundamental step for the development of integrated management plans and protection measures, taking into account both the production requirements, and the environmental factors related to these important ecosystems.
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Warke, Gillian M. A. "The ecology and diet of the cormorant Phalacrocorax carbo carbo (L.) in Northern Ireland." Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260486.

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Childress, R. Brooks. "Breeding biology and ecology of the great cormorant (Phalacrocorax carbo lucidus) at Lake Naivasha, Kenya." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/29776.

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This thesis examines breeding season timing and seasonal declines in reproductive success in piscivores nesting inland near the equator. Also explored are the effects of sexual character intensity and nest-site characteristics on breeding timing, fecundity and mate choice, as well as the effects of resource partitioning between two similar piscivores. P. carbo lucidus is a relatively common, but little-studied, piscivore of sub-Saharan Africa. Lake Naivasha (0° 46' S) is reputed to be seasonally-constant in fish production. The colony studied was newly-established in 1995, the first year of the two-year study. At Lake Naivasha, P. carbo lucidus bred primarily during April-June. There was no evidence of a consistent increase in prey in the lake during this period, and the timing did not appear to result from any other consistent environmental-response adaptation. However, the onset of the main rains appeared to be an important stimulant. Based on studies by others, this subspecies breeds during April-June throughout sub-Saharan Africa, irrespective of the local rainfall regime or differences in photoperiod trend. While nesting at Lake Naivasha, a large portion of the colony appeared to forage at other locations. It is suggested that breeding timing at Lake Naivasha may be controlled by the combination of an increase in prey abundance generally throughout sub-Saharan Africa during April-June, the subspecies' nearly 12-month endogenous reproductive cycle, and the onset of the main rains. A significant seasonal decline in reproductive success was observed. Combining the two years, the mean number of chicks fledged by the first third of pairs to start laying (2.9) was significantly greater than that of the last third (1.2). The primary reason appeared to be the greater age (and experience) of the early-breeding pairs. Egg or chick predation did not seem to be an important factor, even for late breeding pairs. Breeding interference by hungry chicks from earlier broods appeared to be an important factor limiting the reproductive success of late-breeding pairs. In the first year of the new colony, the earliest-breeding pairs (first third) preferentially selected canopy-top nest sites (76%) vs. sites below the canopy (24%). They also built significantly larger nests than later-breeding pairs. Canopy-top locations and larger nests had significant positive effects on brood size and fecundity in the colony's first year but not in its second year.
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Meyer, Corlia. "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." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13358.

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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 main reason for this study was to determine if climate change could be identified as a factor which has influenced the decreasing numbers of bank cormorants. This involved research on the heat stress behaviour, breeding success and population trends of the bank cormorant in the Western Cape, South Africa. High environmental temperatures resulting in heat stress and storms with associated extreme environmental variables was predicted to cause breeding failures, decreasing breeding success. As a result, climate change can also affect long-term trends in the adult population of the bank cormorant, and this was examined using the population data of nine bank cormorant colonies in the Western Cape, South Africa. A link existed between ambient and operative temperature, and the latter was used for statistical analysis. Mean operative temperatures of over 30°C were experienced. Temperatures were highest at the bank cormorant colony at Robben Island when three colonies were compared (Robben Island, Jutten Island and Stony Point). Increased environmental temperatures resulted in the average bank cormorant increasing its time spent employing thermoregulatory behaviour. Bank cormorants were shown to start gular fluttering at 21°C on average and spend all their time gular fluttering when they experienced an operative temperature of 34.2°C or higher. The birds also started employing this thermoregulatory behaviour at a lower temperature when on eggs or small chicks. During the study period, the breeding success of the bank cormorant was not impacted by high temperatures at the three bank cormorant colonies studied. Wave and wind action, associated with storms, resulted in a lowered reproductive output during the breeding seasons of 2012 and 2013. Both incubation success and chick rearing success did not differ significantly between 2012 and 2013 for the three bank cormorant colonies at Robben Island, Jutten Island and Stony Point. The study of long-term trends in colony sizes of nine bank cormorant colonies in the Western Cape, South Africa revealed a decrease in the bank cormorants breeding population. The decrease could not be directly associated with climate change in the region. An increase in the mean maximum temperatures and a decrease in the annual rainfall did not affect the bank cormorant numbers, but rather the fecundity. This resulted in a lagged effect of climate change on the bank cormorant population. Climate change and extreme weather events can cause massive breeding failures.
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Kelley, Adam. "A population survey and foraging analysis of the Double-crested cormorant (Phalacrocorax auritus) on the Santee lakes, South Carolina." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1220474447/.

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Cummins, James B. "Adrenergic and Cholinergic Regulation of Cardiovascular Function in Embryonic Neotropic Cormorants (Phalacrocorax basilianus)." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984219/.

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Investigations of cholinergic and adrenergic tone on heart rate (fH) and mean arterial pressure (Pm) during embryonic development have been conducted on numerous avian species. While these investigations have documented that adrenergic tone, a continuous stimulation, on fH and Pm is vital to embryonic development in the birds studied to date, development of cholinergic tone on fH has been shown to vary even within species. Further, past studies have been bias to focus primarily on precocial species while altricial species remain poorly understood in this context. The goal of this investigation was to investigate the role of cholinergic and adrenergic tone on fH and Pm of an altricial species, the neotropic cormorant (P. brasilianus) to address this bias. The embryonic neotropic cormorant possesses B-and-a adrenergic tone on fH and Pm at 70% and 90% incubation while cholinergic tone on fH occurs at 90% incubation. This pattern of control is similar to that previously reported for several species of precocial birds suggesting the development of tonic cardiovascular regulation may be conserved across avian taxa.
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Books on the topic "Cormorant"

1

Cormorant. London: HarperCollins, 1994.

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Gallant, Elizabeth Anne. Summer food habits and feeding behaviour of the double-crested cormorant Phalacrocorax auritus lesson on Prince Edward Island. Ottawa: National Library of Canada, 1989.

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Gallant, Elizabeth Anne. Summer food habits and feeding behaviour of the double-crested cormorant Phalacrocorax auritus lesson on Prince Edward Island. Wolfville, N.S: Acadia University, 1988.

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Stephen, Gregory. The cormorant. (Sevenoaks): Sceptre, 1987.

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Stephen, Gregory. The cormorant. London: Heinemann, 1986.

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Stephen, Gregory. The cormorant. Kansas City: Valancourt Books, 2013.

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Peter, Markham, Gregory Stephen 1952-, and Ransley Peter, eds. The Cormorant. London: BBC, 1993.

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Stephen, Gregory. The cormorant. New York: St. Martin's Press, 1986.

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Weinberger, Jane D. Cory the cormorant. Mt. Desert, ME: Windswept House Publishers, 1992.

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ill, Betera Carol, ed. The uncommon cormorant. Swords, Co. Dublin, Ireland: Poolbeg Press, 1990.

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Book chapters on the topic "Cormorant"

1

Kelly, A. A. "The Wounded Cormorant." In Liam O’Flaherty The Collected Stories, 227–29. New York: Palgrave Macmillan US, 1999. http://dx.doi.org/10.1007/978-1-137-07257-3_51.

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Rauschmayer, Felix, and Vivien Weiss. "Screening the Cormorant Conflict on the European Level." In Human - Wildlife Conflicts in Europe, 183–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-34789-7_9.

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Leadbetter, Gregory. "Transnatural Language: The “Library-Cormorant” in the “Vernal Wood”." In Coleridge and the Daemonic Imagination, 69–97. New York: Palgrave Macmillan US, 2011. http://dx.doi.org/10.1057/9780230118522_5.

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Wright, G. A. "Turnover in a Wintering Cormorant Population: Implications for Management." In Interactions Between Fish and Birds: Implications for Management, 345–53. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch26.

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Wolter, C., and R. Pawlizki. "Seasonal and Spatial Variation in Cormorant Predation in Alowland Floodplain River." In Interactions Between Fish and Birds: Implications for Management, 178–86. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch13.

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Baccetti, Nicola. "Wintering Population of the Common Cormorant Phalacrocorax Carbo Sinensis in Tuscany, Italy." In Mediterranean Marine Avifauna, 491–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70895-4_30.

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Johansen, Sasia, Ole Næsbye Larsen, Jakob Christensen-Dalsgaard, Lars Seidelin, Tina Huulvej, Kristine Jensen, Sven-Gunnar Lunneryd, Maria Boström, and Magnus Wahlberg. "In-Air and Underwater Hearing in the Great Cormorant (Phalacrocorax carbo sinensis)." In The Effects of Noise on Aquatic Life II, 505–12. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2981-8_61.

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Diamond, M., M. W. Aprahamian, and R. North. "A Theoretical Assessment of Cormorant Impact on Fish Stocks in Great Britain." In Interactions Between Fish and Birds: Implications for Management, 43–50. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch4.

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Stempniewicz, L., A. Martyniak, W. Borowski, and M. Goc. "Fish Stocks, Commercial Fishing and Cormorant Predation in the Vistula Lagoon, Poland." In Interactions Between Fish and Birds: Implications for Management, 51–64. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch5.

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Britton, J. R., J. P. Harvey, I. G. Cowx, T. Holden, M. J. Feltham, B. R. Wilson, and J. M. Davies. "Key Factor Analysis to Assess Cormorant Depredation on Inland Fisheries in the UK." In Interactions Between Fish and Birds: Implications for Management, 14–27. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch2.

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Conference papers on the topic "Cormorant"

1

Hintze, Daniel, Rainhard D. Findling, Muhammad Muaaz, Eckhard Koch, and René Mayrhofer. "Cormorant." In the 2015 ACM International Joint Conference. New York, New York, USA: ACM Press, 2015. http://dx.doi.org/10.1145/2800835.2800906.

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Hintze, Daniel, Matthias Füller, Sebastian Scholz, Rainhard D. Findling, Muhammad Muaaz, Philipp Kapfer, Wilhelm Nüßer, and René Mayrhofer. "CORMORANT." In MoMM2019: The 17th International Conference on Advances in Mobile Computing & Multimedia. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3365921.3365923.

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Lord, D. J., J. G. Brinkhorst, T. J. Robertson, and R. H. Martin. "Coiled Tubing Drilling on the North Cormorant Platform." In SPE/ICoTA Coiled Tubing Roundtable. Society of Petroleum Engineers, 1998. http://dx.doi.org/10.2118/46046-ms.

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Pall, Raman. "On the availability of the CH149 Cormorant fleet." In 2008 Winter Simulation Conference (WSC). IEEE, 2008. http://dx.doi.org/10.1109/wsc.2008.4736189.

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Elgersma, A. G. A. "The Central Cormorant Field Subsea Development: A Case History." In Offshore Technology Conference. Offshore Technology Conference, 1994. http://dx.doi.org/10.4043/7588-ms.

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Grant, I., J. D. Marshall, P. Dietvorst, and J. Hordijk. "Improved Reservoir Management by Integrated Study: Cormorant Field, Block 1." In European Petroleum Conference. Society of Petroleum Engineers, 1990. http://dx.doi.org/10.2118/20891-ms.

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Xiong, Pengcheng, Xin He, Hakan Hacigumus, and Prashant Shenoy. "Cormorant: Running Analytic Queries on MapReduce with Collaborative Software-Defined Networking." In 2015 Third IEEE Workshop on Hot Topics in Web Systems and Technologies (HotWeb). IEEE, 2015. http://dx.doi.org/10.1109/hotweb.2015.10.

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Hansen, Kirstin Anderson, Ole Næsbye Larsen, Magnus Wahlberg, and Ursula Siebert. "Underwater hearing in the great cormorant (Phalacrocorax carbo sinensis): Methodological considerations." In 168th Meeting of the Acoustical Society of America. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000267.

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Haase, Stefanie, Karin Husy, Michele Casini, Krzysztof Radtke, and Uwe Krumme. "Eaten by a cormorant: Unexpected return of a tagged Baltic cod." In 2021 International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2021. http://dx.doi.org/10.1109/metrosea52177.2021.9611573.

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Gould, S., and J. Marshall. "The Cormorant Formation (late Triassic) of the Tern Field, Northern North Sea." In 69th EAGE Conference and Exhibition - Workshop Package. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609.201405141.

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Reports on the topic "Cormorant"

1

Dorr, Brian S., Kristi L. Sullivan, Paul D. Curtis, Richard B. Chipman, and Russell D. McCullough. Double-crested Cormorants. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, August 2016. http://dx.doi.org/10.32747/2016.7207735.ws.

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The history of conflict between double-crested cormorants and human interest in fisheries is long and convoluted. Overall, double-crested cormorants are not major consumers of commercial and sportfish species. However, exceptions have been recorded at specific sites with documented impacts on local fisheries. Double-crested cormorants can have a significant impact on vegetation at breeding sites through normal nesting activities. Their guano is acidic and can change soil chemistry, killing ground vegetation and irreversibly damaging nest trees. Humans should avoid direct contact with excrement from wildlife, including droppings from cormorants. The U.S. Fish and Wildlife Service (USFWS) has the primary responsibility and authority for managing migratory bird populations in the U.S. This publication will focus on the double-crested cormorant, which is the most numerous and widely dispersed of the species.
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Clarke, M. D. Surficial Geology, Cormorant Lake, Manitoba-Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127672.

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Lucas, S. B. Geology of the Cormorant Lake sheet (NTS 63K), Manitoba and Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183860.

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McMartin, I. Ice flow events in the Cormorant Lake-Wekusko Lake area, northern Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/193825.

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Thomas, M. D., B. L. Williamson, R. P. Williams, and W. Miles. Progress report on gravity surveys in Cormorant Lake map area, Manitoba-Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/134250.

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Clarke, M. D. Surficial Geology, Flin Flon, Reed Lake, Rocky Lake, Cormorant Lake, Manitoba Saskatchewan [063k]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130436.

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Avery, M. P. Vitrinite reflectance (Ro) of dispersed organic matter from Amoco-Imperial Cormorant N-83. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215479.

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Forbes, D. L. HMCS Cormorant and SDL-1 Operations On the Inner Scotian Shelf [Cruise Report 89302]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132377.

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Williams, G. L. Palynological analysis of Amoco-Imperial Cormorant N-83, Jeanne d'Arc Basin, Grand Banks of Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2006. http://dx.doi.org/10.4095/221812.

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Leclair, A. D., R. G. Scott, and S. B. Lucas. Sub-Paleozoic geology of the Flin Flon Belt from integrated drillcore and potential field data, Cormorant Lake area, Manitoba and Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/134251.

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