The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Michael Lierz - One of the best experts on this subject based on the ideXlab platform.
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Accipiter hawks ( Accipitridae ) confirmed as definitive hosts of Sarcocystis turdusi , Sarcocystis cornixi and Sarcocystis sp. ex Phalacrocorax carbo
Parasitology research, 2016Co-Authors: Sylvia L. Mayr, Kristina Maier, Jana Müller, Dirk Enderlein, Achim D. Gruber, Michael LierzAbstract:Sarcocystis is a large genus of protozoan parasites with complex heteroxenous life cycles. For many species, either the intermediate or the definitive host is still unknown. In this study, 116 Accipiter hawks (Eurasian sparrowhawks and northern goshawks) were investigated for the presence of Sarcocystis spp. in their intestinal tract or their faeces. To gain a wide distribution, samples were collected throughout Germany within 2 years. It was possible to detect Sarcocystis-like oocysts in 65 samples. Sequencing of the ITS region or species-specific PCR identified 33 samples as Sarcocystis turdusi/Sarcocystis sp. ex A. nisus (18), Sarcocystis calchasi (6), Sarcocystis columbae (3), Sarcocystis cornixi (3) and Sarcocystis sp. ex Phalacrocorax carbo (3). Besides the known infestation with S. columbae, S. sp. ex A. nisus and S. calchasi the Accipiter hawks were thereby confirmed as definitive host of S. turdusi, S. cornixi and S. sp. ex Phalacrocorax carbo for the first time.
Mylswamy Mahendiran - One of the best experts on this subject based on the ideXlab platform.
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Coexistence of three sympatric cormorants (Phalacrocorax spp.); partitioning of time as an ecological resource
Royal Society open science, 2016Co-Authors: Mylswamy MahendiranAbstract:Resource partitioning is well known along food and habitat for reducing competition among sympatric species, yet a study on temporal partitioning as a viable basis for reducing resource competition is not empirically investigated. Here, I attempt to identify the mechanism of temporal partitioning by intra- and interspecific diving analyses of three sympatric cormorant species at different freshwater wetlands around the Delhi region. Diving results indicated that cormorants opted for a shallow diving; consequently, they did not face any physiological stress. Moreover, diving durations were linked with seasons, foraging time and foraging habitats. Intraspecific comparison suggested that cormorants spent a longer time underwater in early hours of the day. Therefore, time spent for dive was higher in the forenoon than late afternoon, and the interspecific analysis also yielded a similar result. When Phalacrocorax niger and Phalacrocorax fuscicollis shared the same foraging habitat, they tended to differ in their foraging time (forenoon/afternoon). However, when P. niger and Phalacrocorax carbo shared the same foraging time, they tended to use different foraging habitats (lentic/lotic) leading to a mechanism of resource partitioning. Thus, sympatric cormorants effectively use time as a resource to exploit the food resources and successful coexistence.
B. M. Culik - One of the best experts on this subject based on the ideXlab platform.
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Flexible foraging techniques in breeding Cormorants Phalacrocorax carbo and Shags Phalacrocorax aristotelis : benthic or pelagic feeding?
Ibis, 2008Co-Authors: David Grémillet, G. Argentin, B. Schulte, B. M. CulikAbstract:A total of 8772 dive durations were recorded during 117 diving bouts in five Cormorants Phalacrocorax carbo and five Shags Phalacrocorax aristotelis breeding at the Chausey Islands, France. Diet of the birds was assessed by analysis of 526 pellets containing 13,016 otoliths. Radio-tracking data indicated that Cormorants fed exclusively on pelagic fish during social fishing (5% of the trips) and executed 11% pelagic and 60% benthic dives during the remaining 95% of the trips. In Shags, 44% of all trips were pelagic, and the remaining 56% included 9% pelagic and 67% benthic dives. The proportions of benthic to pelagic dives varied widely between dive sequences of single birds and between individuals and sexes in both species. The prey spectrum of the Cormorants contained both pelagic (29%) and benthic fish (67%) and confirmed considerable flexibility in foraging. In Shags, birds may adjust their diving patterns to accommodate the behaviour of their main prey, sandeels Ammodytidae (87% of all prey). We propose that the wetability of plumage may explain this flexibility.
Francis Daunt - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Pronounced long-term trends in year-round diet composition of the European shag Phalacrocorax aristotelis
Marine Biology, 2019Co-Authors: Richard J. Howells, Sarah J. Burthe, Jonathan A. Green, Michael P. Harris, Mark A. Newell, Adam Butler, Sarah Wanless, Francis DauntAbstract:The article Pronounced long-term trends in year-round diet composition of the European shag Phalacrocorax aristotelis, written by Richard J. Howells, Sarah J. Burthe, Jonathan A. Green, Michael P. Harris, Mark A. Newell, Adam Butler, Sarah Wanless and Francis Daunt, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 21 November 2018 without open access.
Sylvia L. Mayr - One of the best experts on this subject based on the ideXlab platform.
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Accipiter hawks ( Accipitridae ) confirmed as definitive hosts of Sarcocystis turdusi , Sarcocystis cornixi and Sarcocystis sp. ex Phalacrocorax carbo
Parasitology research, 2016Co-Authors: Sylvia L. Mayr, Kristina Maier, Jana Müller, Dirk Enderlein, Achim D. Gruber, Michael LierzAbstract:Sarcocystis is a large genus of protozoan parasites with complex heteroxenous life cycles. For many species, either the intermediate or the definitive host is still unknown. In this study, 116 Accipiter hawks (Eurasian sparrowhawks and northern goshawks) were investigated for the presence of Sarcocystis spp. in their intestinal tract or their faeces. To gain a wide distribution, samples were collected throughout Germany within 2 years. It was possible to detect Sarcocystis-like oocysts in 65 samples. Sequencing of the ITS region or species-specific PCR identified 33 samples as Sarcocystis turdusi/Sarcocystis sp. ex A. nisus (18), Sarcocystis calchasi (6), Sarcocystis columbae (3), Sarcocystis cornixi (3) and Sarcocystis sp. ex Phalacrocorax carbo (3). Besides the known infestation with S. columbae, S. sp. ex A. nisus and S. calchasi the Accipiter hawks were thereby confirmed as definitive host of S. turdusi, S. cornixi and S. sp. ex Phalacrocorax carbo for the first time.
