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Limnological Review
Volume 18
Issue 4
10.2478/limre-2018-0016
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Limnological Review is published by MDPI from Volume 22 Issue 1 (2022). Previous articles were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence, and they are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Sciendo.
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Article

Differences in the Diet of Breeding Cormorants Phalacrocorax carbo sinensis in an Inland Colony: The Effect of Years, Breeding Stages and Locations within the Colony

by
Simone Buttu
1,*,
Giulia Atzori
1,
Francesco Palmas
1 and
Robert Gwiazda
2
1
Department of Life and Environment Sciences–Section of Animal Biology and Ecology, University of Cagliari, Via T. Fiorelli, 1-09126 Cagliari, Italy
2
Institute of Nature Conservation–Polish Academy of Sciences, Mickiewicza 33, 31-120 Kraków, Poland
*
Author to whom correspondence should be addressed.
Limnol. Rev. 2018, 18(4), 149-156; https://doi.org/10.2478/limre-2018-0016
Published: 25 January 2019

Abstract

A study of the diet of the Great Cormorant Phalacrocorax carbo sinensis (fish species and size) in (1) different seasons (years), (2) breeding stages (incubation and chick rearing), and (3) breeding areas (center and edge) in the colony in the Dzierżno-Duże Reservoir (southern Poland) was carried out. Overall, 147 pellets of the Great Cormorant were analysed. The low values of the indexes of Levin (Bi) and Shannon (H’) showed a limited trophic spectrum in the diet of the Great Cormorant. Roach (Rutilus rutilus) with a percentage index of relative importance (%IRI) of 62.89, perch (Perca fluviatilis) (%IRI = 22.63) and carp (Cyprinus carpio) (%IRI = 10.43), were the most common prey. Evident changes in the diet between 2003 and 2014, with less roach and more perch and ruffe in 2014 were found. They could be probably related to changes in the fish community. Differences in the food of cormorants between breeding stages reflected dietary requirements of the chicks. During the breeding season younger chicks require feeding with smaller fish than older chicks. The proportion of fish species found in the cormorant diet differed between the edge and the centre of the colony. We concluded that the impact of Great Cormorants on native fish assemblages may be dependent on the location within the colony, development state of the chicks and season, not just fish availability.
Keywords: Phalacrocorax carbo sinensis; pellet analysis; food composition; fish size; daily food intake Phalacrocorax carbo sinensis; pellet analysis; food composition; fish size; daily food intake

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MDPI and ACS Style

Buttu, S.; Atzori, G.; Palmas, F.; Gwiazda, R. Differences in the Diet of Breeding Cormorants Phalacrocorax carbo sinensis in an Inland Colony: The Effect of Years, Breeding Stages and Locations within the Colony. Limnol. Rev. 2018, 18, 149-156. https://doi.org/10.2478/limre-2018-0016

AMA Style

Buttu S, Atzori G, Palmas F, Gwiazda R. Differences in the Diet of Breeding Cormorants Phalacrocorax carbo sinensis in an Inland Colony: The Effect of Years, Breeding Stages and Locations within the Colony. Limnological Review. 2018; 18(4):149-156. https://doi.org/10.2478/limre-2018-0016

Chicago/Turabian Style

Buttu, Simone, Giulia Atzori, Francesco Palmas, and Robert Gwiazda. 2018. "Differences in the Diet of Breeding Cormorants Phalacrocorax carbo sinensis in an Inland Colony: The Effect of Years, Breeding Stages and Locations within the Colony" Limnological Review 18, no. 4: 149-156. https://doi.org/10.2478/limre-2018-0016

APA Style

Buttu, S., Atzori, G., Palmas, F., & Gwiazda, R. (2018). Differences in the Diet of Breeding Cormorants Phalacrocorax carbo sinensis in an Inland Colony: The Effect of Years, Breeding Stages and Locations within the Colony. Limnological Review, 18(4), 149-156. https://doi.org/10.2478/limre-2018-0016

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