The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
F. Campos - One of the best experts on this subject based on the ideXlab platform.
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recent changes in the food of the grey heron Ardea cinerea in central west spain
Ibis, 2008Co-Authors: S J Peris, F J Briz, F. CamposAbstract:As far as we know, there are no data on how changes in the freshwater fauna within the same area affect the feeding preference of the Grey Heron Ardea cinerea. We present data on the diet of the bird during the breeding seasons of 1990 and 1991 in central-west Spain and compare these data with those obtained from the same colonies in 1986–1987.
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Temporal variations in the feeding habits of the Purple Heron Ardea purpurea during the breeding season
Ibis, 1997Co-Authors: F. Campos, J. M. LekuonaAbstract:The foraging strategies of adult Purple Herons Ardea purpurea from an increasing colony in northern Spain were studied in the feeding areas (nonagricultural habitats) during the breeding season (May-July). In this area, herons were mainly piscivorous, and there was no seasonal variation in prey type. Small fish (
Antoon F De Bont - One of the best experts on this subject based on the ideXlab platform.
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movements of radio tagged grey herons Ardea cinerea during the breeding season in a large pond area
Ibis, 2008Co-Authors: Janike Van Vessem, Dirk Draulaks, Antoon F De BontAbstract:This paper describes the strategies of resource utilization in the course of the breeding season by five radio-tagged Grey Herons Ardea cinerea. The seasonal changes in exploitation of the environment by two breeding adults, one non-breeding adult and two non-breeding first-year birds were studied from March to August 1982, near Zonhoven in Belgium. Two adult breeding birds could be followed continuously from the end of March until the middle of June. During the first month they explored an extended area all around the colony, but each concentrated its search in a specific direction. From the end of April until the beginning of June, most probably from egg-hatching until the end of breeding activities, each bird spent a very large proportion of its time at a particular feeding site, from which other herons were actively excluded. In the first part of June they again visited different sites, each maintaining its preferred direction. From the middle of June onwards they seemed to have left the fish-pond area. The pattern of movements of the first-year birds differed markedly from that of the breeding adults. In April, although both non-breeding and breeding birds explored large areas, only the areas used by non-breeders were centred on the colony. From the end of April onwards, probably after general egg-hatching in the colony, the non-breeders very rarely revisited the colony, and from May till August their ranges became more and more restricted to very small areas at an increasing distance from the colony. They were never observed defending particular sites. The results are discussed with regard to recent speculations about the evolution of colonies as an adaptation for the exploitation of food resources. Breeding herons seem to explore a large part of the environment during incubation and defend a particular site while feeding their young. Choice of feeding site by non-breeding birds may be influenced by the site defence of the breeding birds. Non-breeding birds exploit a large area when breeding birds occupy feeding territories. Perhaps they are forced to forage in less suitable places at this time. Colonies might have evolved as a strategy to minimize effort in resource esploitation as, especially at the beginning of the breeding season, the colony could act as an assembly point in the exploration of the environment. However, its importance as an assembly point diminishes in the course of the season, as non-breeding birds no longer visit the colony and adults defend territories.
Ricardo M. Takemoto - One of the best experts on this subject based on the ideXlab platform.
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Phylogenetic position of Diplostomum spp. from New World herons based on complete mitogenomes, rDNA operons, and DNA barcodes, including a new species with partially elucidated life cycle
Parasitology Research, 2020Co-Authors: Sean A. Locke, Fabiana B. Drago, Verónica Núñez, Geza Thais Rangel E Souza, Ricardo M. TakemotoAbstract:Diplostomum Ardeae Dubois, 1969 has seldom been reported since its description from the great blue heron ( Ardea herodias L., 1758) in the USA. Sequences obtained in this study from the barcode region of cytochrome c oxidase 1 (CO1) in diplostomids from black-crowned night heron ( Nycticorax nycticorax (L., 1758)) in Puerto Rico matched data from D. Ardeae from A. herodias in the type region. We also obtained DNA barcodes from morphologically similar diplostomids from a rufescent tiger heron ( Tigrisoma lineatum (Boddaert, 1783)) and from metacercariae from eye lenses of Trachelyopterus galeatus (Linnaeus, 1766) from the Paraná River basin in Argentina and Brazil, respectively. Barcodes matched (97–100% identity) in these South American adult and larval specimens as well as in recently published sequences from metacercariae from 11 other siluriform fishes from the same region. Barcodes from the South American species, which we describe as Diplostomum lunaschiae n. sp., differed from those of D. Ardeae by 7.2–9.8%, and the new species differs from D. Ardeae in its size, pharynx:oral sucker length ratio, egg:body length ratio, and distribution of vitellaria. As in prior phylogenetic analysis of CO1 sequences, both D. Ardeae and D. lunaschiae n. sp. were not associated with Diplostomum . In more character-rich analyses of nuclear rDNA and of mitochondrial genomes, D. Ardeae was an early divergent member of clades of species of Diplostomum . Consequently, we continue to consider D. Ardeae and D. lunaschiae n. sp. members of Diplostomum , in contrast to recent suggestions that these species may belong to a different genus.
Xiaofeng Huang - One of the best experts on this subject based on the ideXlab platform.
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complete mitogenome of intermediate egret Ardea intermedia ciconiiformes ardeidae
Mitochondrial DNA Part B, 2017Co-Authors: Feiyun Tu, Shan Tang, Xiaofeng HuangAbstract:The Intermediate Egret Ardea intermedia belongs to family Ardeidae, and it is widely distributed over east Africa across the Indian subcontinent to Southeast Asia and Australia. In the present stud...
D F Owen - One of the best experts on this subject based on the ideXlab platform.
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the food of the heron Ardea cinerea in the breeding season
Ibis, 2008Co-Authors: D F OwenAbstract:Summary. 1 Food samples were collected from nestlings at three heronries by forcing them to regurgitate recent meals. 2 Young Herons are fed about 3–4 times in 24 hours when one parent is feeding and about twice as often when both are feeding. Feeding is most frequent just after dawn and in the evening. It is estimated that a brood of Herons receives on the average 230 pounds of food during the nestling period. 3 Herons select food between certain size limits, avoiding both very small and very large prey. 4 The proportion of each species of prey was different at different heronries, correlated with the available feeding grounds. There were also some differences between years. 5 The proportion of the various prey-species varied with the season because some species changed their habits and were thus not always equally available to the Herons. At the peak of the breeding season food was more plentiful than either earlier or later. 6 Certain Herons tended to specialize on certain species of prey, apparently because they often returned to the same feeding area. 7 Many nestling Herons died of starvation and it is concluded that food is often short in the breeding season. The importance of asynchronous hatching is discussed. 8 The breeding season of the Heron appears to be timed so that the young are in the nest when the chief species of prey are most available.
