The Experts below are selected from a list of 1536 Experts worldwide ranked by ideXlab platform
Jacob Gonzalezsolis - One of the best experts on this subject based on the ideXlab platform.
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a geolocator tagged fledgling provides first evidence on juvenile movements of cory s shearwater Calonectris borealis
Bird Study, 2019Co-Authors: Raul Ramos, Virginia Morerapujol, Marta Cruzflores, Sofia Lopezsouto, Jacob GonzalezsolisAbstract:ABSTRACTUsing geolocator-immersion loggers, we tracked for the first time the migration of one Cory’s Shearwater Calonectris borealis fledgling, from its breeding colony in the Canary Islands, and ...
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pardela cenicienta atlantica Calonectris borealis cory 1881
2016Co-Authors: Jose Manuel De Los Reyes, Jacob Gonzalezsolis, Juan BécaresAbstract:Aves - Orden Procellariiformes - Familia Procellariidae en la Enciclopedia Virtual de Vertebrados Espanoles, http://www.vertebradosibericos.org/.
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pardela cenicienta mediterranea Calonectris diomedea scopoli 1769
2016Co-Authors: Jose Manuel De Los Reyes, Jacob Gonzalezsolis, Alfredo Salvador MillaAbstract:Aves - Orden Procellariiformes - Familia Procellariidae en la Enciclopedia Virtual de Vertebrados Espanoles, http://www.vertebradosibericos.org/. Versiones anteriores: 20-02-2012
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niche partitioning of feather mites within a seabird host Calonectris borealis
PLOS ONE, 2015Co-Authors: Heather C Proctor, Laura Michaela Stefan, Elena Gomezdiaz, Karen D Mccoy, Eric Elguero, Jacob GonzalezsolisAbstract:According to classic niche theory, species can coexist in heterogeneous environments by reducing interspecific competition via niche partitioning, e.g. trophic or spatial partitioning. However, support for the role of competition on niche partitioning remains controversial. Here, we tested for spatial and trophic partitioning in feather mites, a diverse and abundant group of arthropods. We focused on the two dominant mite species, Microspalax brevipes and Zachvatkinia ovata, inhabiting flight feathers of the Cory’s shearwater, Calonectris borealis. We performed mite counts across and within primary and tail feathers on free-living shearwaters breeding on an oceanic island (Gran Canaria, Canary Islands). We then investigated trophic relationships between the two mite species and the host using stable isotope analyses of carbon and nitrogen on mite tissues and potential host food sources. The distribution of the two mite species showed clear spatial segregation among feathers; M. brevipes showed high preference for the central wing primary feathers, whereas Z. ovata was restricted to the two outermost primaries. Morphological differences between M. brevipes and Z. ovata support an adaptive basis for the spatial segregation of the two mite species. However, the two mites overlap in some central primaries and statistical modeling showed that Z. ovata tends to outcompete M. brevipes. Isotopic analyses indicated similar isotopic values for the two mite species and a strong correlation in carbon signatures between mites inhabiting the same individual host suggesting that diet is mainly based on shared host-associated resources. Among the four candidate tissues examined (blood, feather remains, skin remains and preen gland oil), we conclude that the diet is most likely dominated by preen gland oil, while the contribution of exogenous material to mite diets is less marked. Our results indicate that ongoing competition for space and resources plays a central role in structuring feather mite communities. They also illustrate that symbiotic infracommunities are excellent model systems to study trophic ecology, and can improve our understanding of mechanisms of niche differentiation and species coexistence.
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new species of the feather mite genus promegninia gaud atyeo acari avenzoariidae from petrels and shearwaters procellariiformes procellariidae
Systematic Parasitology, 2015Co-Authors: Sergey Mironov, Laura M. Stefan, Jacob GonzalezsolisAbstract:Two new species of the feather mite genus Promegninia Gaud & Atyeo, 1967 (Avenzoariidae: Bonnetellinae) are described from procellariids in the northeasterm Atlantic Ocean: Promegninia bulweriae n. sp. from the Bulwer's petrel Bulweria bulwerii (Jardine & Selby) and P. Calonectris n. sp. from the Cory's shearwater Calonectris borealis (Cory) (Procellariiformes: Procellariidae). Males of P bulweriae n. sp. are most clearly distinguished from the other known species in the genus by having short legs III extending only to the level of lobar apices and short conical tarsi III with lanceolate ventral seta w; females of this species are characterised by the absence of additional sclerites at postero-lateral angles of the prodorsal shield. Males of P. Calonectris differ from the other known species in having bidentate terminal lamellae on the lobar apices and the entire adanal shield; females of this species are distinguished by having well-developed pygidial shields and a hysteronotal shield encompassing the bases of setae c2. Sequence data of the mitochondrial cytochrome c oxidase subunit I gene fragment (COI) are also obtained for the new species. An updated diagnosis of Promegninia and a key to the known species are provided.
William Tyler Bradley - One of the best experts on this subject based on the ideXlab platform.
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an improved leaf disc bioassay for detecting calonectria pseudonaviculata in soil and potting media
Plant Disease, 2014Co-Authors: Norm Dart, Chuanxue Hong, William Tyler BradleyAbstract:Abstract Boxwood blight caused by Calonectria pseudonaviculata results in severe defoliation and dieback to boxwood (Buxus spp.). The pathogen was first described in the United Kingdom and New Zealand in the mid to late 1990s and has since spread throughout Europe and most recently to the United States and Canada. While many Calonectria spp. have an epidemiologically significant soil phase, little is known of the role of the soil phase of C. pseudonaviculata in the epidemiology of boxwood blight. We optimized a leaf disc bioassay for detecting and quantifying this pathogen in soil and compared this bioassay with a standard soil plating assay originally developed for quantifying Calonectria using a Suffolk sandy-loam soil. Additionally, the sensitivity of both assays was compared among three distinct soil types (sand-loam, silt-loam, and sand-peat potting media). The optimal incubation time for baiting C. pseudonaviculata from soil using the leaf disc bioassay was 96 h. The optimal soil moisture for the bi...
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an improved leaf disc bioassay for detecting calonectria pseudonaviculata in soil and potting media
Plant Disease, 2014Co-Authors: Norm Dart, Chuanxue Hong, William Tyler BradleyAbstract:Abstract Boxwood blight caused by Calonectria pseudonaviculata results in severe defoliation and dieback to boxwood (Buxus spp.). The pathogen was first described in the United Kingdom and New Zealand in the mid to late 1990s and has since spread throughout Europe and most recently to the United States and Canada. While many Calonectria spp. have an epidemiologically significant soil phase, little is known of the role of the soil phase of C. pseudonaviculata in the epidemiology of boxwood blight. We optimized a leaf disc bioassay for detecting and quantifying this pathogen in soil and compared this bioassay with a standard soil plating assay originally developed for quantifying Calonectria using a Suffolk sandy-loam soil. Additionally, the sensitivity of both assays was compared among three distinct soil types (sand-loam, silt-loam, and sand-peat potting media). The optimal incubation time for baiting C. pseudonaviculata from soil using the leaf disc bioassay was 96 h. The optimal soil moisture for the bi...
Norm Dart - One of the best experts on this subject based on the ideXlab platform.
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an improved leaf disc bioassay for detecting calonectria pseudonaviculata in soil and potting media
Plant Disease, 2014Co-Authors: Norm Dart, Chuanxue Hong, William Tyler BradleyAbstract:Abstract Boxwood blight caused by Calonectria pseudonaviculata results in severe defoliation and dieback to boxwood (Buxus spp.). The pathogen was first described in the United Kingdom and New Zealand in the mid to late 1990s and has since spread throughout Europe and most recently to the United States and Canada. While many Calonectria spp. have an epidemiologically significant soil phase, little is known of the role of the soil phase of C. pseudonaviculata in the epidemiology of boxwood blight. We optimized a leaf disc bioassay for detecting and quantifying this pathogen in soil and compared this bioassay with a standard soil plating assay originally developed for quantifying Calonectria using a Suffolk sandy-loam soil. Additionally, the sensitivity of both assays was compared among three distinct soil types (sand-loam, silt-loam, and sand-peat potting media). The optimal incubation time for baiting C. pseudonaviculata from soil using the leaf disc bioassay was 96 h. The optimal soil moisture for the bi...
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an improved leaf disc bioassay for detecting calonectria pseudonaviculata in soil and potting media
Plant Disease, 2014Co-Authors: Norm Dart, Chuanxue Hong, William Tyler BradleyAbstract:Abstract Boxwood blight caused by Calonectria pseudonaviculata results in severe defoliation and dieback to boxwood (Buxus spp.). The pathogen was first described in the United Kingdom and New Zealand in the mid to late 1990s and has since spread throughout Europe and most recently to the United States and Canada. While many Calonectria spp. have an epidemiologically significant soil phase, little is known of the role of the soil phase of C. pseudonaviculata in the epidemiology of boxwood blight. We optimized a leaf disc bioassay for detecting and quantifying this pathogen in soil and compared this bioassay with a standard soil plating assay originally developed for quantifying Calonectria using a Suffolk sandy-loam soil. Additionally, the sensitivity of both assays was compared among three distinct soil types (sand-loam, silt-loam, and sand-peat potting media). The optimal incubation time for baiting C. pseudonaviculata from soil using the leaf disc bioassay was 96 h. The optimal soil moisture for the bi...
Francesco Bonadonna - One of the best experts on this subject based on the ideXlab platform.
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olfaction and topography but not magnetic cues control navigation in a pelagic seabird displacements with shearwaters in the mediterranean sea
Scientific Reports, 2015Co-Authors: Enrica Pollonara, Francesco Bonadonna, Paolo Luschi, Tim Guilford, Martin Wikelski, Anna GagliardoAbstract:Pelagic seabirds wander the open oceans then return accurately to their habitual nest-sites. We investigated the effects of sensory manipulation on oceanic navigation in Scopoli’s shearwaters (Calonectris diomedea) breeding at Pianosa island (Italy), by displacing them 400 km from their colony and tracking them. A recent experiment on Atlantic shearwaters (Cory’s shearwater, Calonectris borealis) breeding in the Azores indicated a crucial role of olfaction over the open ocean, but left open the question of whether birds might navigate by topographical landmark cues when available. Our experiment was conducted in the Mediterranean sea, where the availability of topographical cues may provide an alternative navigational mechanism for homing. Magnetically disturbed shearwaters and control birds oriented homeward even when the coast was not visible and rapidly homed. Anosmic shearwaters oriented in a direction significantly different from the home direction when in open sea. After having approached a coastline their flight path changed from convoluted to homeward oriented, so that most of them eventually reached home. Beside confirming that magnetic cues appear unimportant for oceanic navigation by seabirds, our results support the crucial role of olfactory cues for birds’ navigation and reveal that anosmic shearwaters are able to home eventually by following coastal features.
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new haematological data in cory s shearwater Calonectris diomedea aves procellariiformes
Italian Journal of Zoology, 2011Co-Authors: Joel Bried, Aurélie Celerier, L Maurel, Francesco BonadonnaAbstract:Abstract Haematology can provide useful information to assess the health of free-ranging animals. In seabirds, many procellariiform (albatrosses and petrels) species undertake long-distance migrations during which individuals may get in contact with birds and pathogens of different biogeographic origin. Although checking whether procellariiformes might play a role in large-scale spread of diseases is desirable, haematological data have been published in very few species. For the first time, we determined blood cell counts in Cory's shearwater, Calonectris diomedea, a petrel which breeds in the western Palearctic but overwinters off Brazil and South Africa. Forty-five adult Cory's shearwaters were captured in their burrows in the Azores archipelago during the pre-laying period in March 2008, measured, weighed, and a blood sample was taken from each of them. Haematocrit, polychromasia, leukocyte and thrombocyte counts did not differ significantly between sexes, but total leukocyte number was significantly (...
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the homing behaviour of cory s shearwaters Calonectris diomedea studied by means of a direction recorder
The Journal of Experimental Biology, 1995Co-Authors: L Antonia, P Antonia, Silvano Benvenuti, Paolo Ioale, Bruno Massa, Francesco BonadonnaAbstract:A direction recorder, which can be carried by a flying bird on its back, has been used for the first time on a wild species. The device can detect and record the direction in which a bird is heading during flight. Cory's shearwaters (Calonectris diomedea) were moved from their nesting colony to five different sites and fitted with direction recorders, and four homing flight paths were obtained. Our data show that the displaced birds were able to assume and maintain a homeward course soon after release over large areas of open sea, completely devoid of guiding features; topographical elements are, therefore, not necessary for correct orientation.
Pierre Jouventin - One of the best experts on this subject based on the ideXlab platform.
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eleven polymorphic microsatellite markers in cory s shearwater Calonectris diomedea and cross species amplification on threatened procellariiformes
Molecular Ecology Resources, 2008Co-Authors: Joel Bried, Marie-pierre Dubois, Pierre Jouventin, Ricardo S SantosAbstract:: For the first time, we describe 11 variable dinucleotide microsatellites and the conditions for multiplexing and simultaneous genotyping sets of loci in Cory's shearwater, Calonectris diomedea. Microsatellite variability was assessed in a colony from the Azores archipelago (Atlantic Ocean). Two to eight alleles were detected per locus, the mean gene diversity being 4.5. Cross-species amplification in three other seabirds (Diomedea exulans, Procellaria aequinoctialis and Bulweria bulwerii) revealed some variability at one, two and eight loci, respectively.
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Ten polymorphic microsatellite markers in the wandering albatross Diomedea exulans
Molecular Ecology Notes, 2005Co-Authors: Marie-pierre Dubois, Philippe Jarne, Pierre JouventinAbstract:We describe 10 new variable dinucleotide microsatellites in the wandering albatross Diomedea exulans , as well as conditions for multiplexing and simultaneous genotyping sets of loci. Their variability was assessed in two and one populations from the Crozet and Kerguelen archipelagos (southern Indian Ocean), respectively. Two to 13 alleles were detected per population, and the mean gene diversity was around 0.4. The low genetic differentiation suggests that these populations constitute a single panmictic unit. Cross-species amplification provided some variability at three and five loci in two other marine birds ( Bulweria bulwerii and Pagodroma nivea ), but none in Calonectris diomedea .
