Manuel Siverio

Manuel Siverio
Grupo de Ornitología e Historia Natural de las islas Canarias | GOHNIC

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70
Publications
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Introduction
I am interested in the natural history and conservation of the birds of the Canary Islands, especially raptors and threatened species.

Publications

Publications (70)
Article
Between 2004 and 2007, we studied density, habitat features and breeding parameters of the osprey (Pandion haliaetus) population in Boa Vista Island (Cape Verde). A total of 79 nest structures were identified, 37 of which were occupied for at least 1 year during the study period. The osprey population ranged between 14 and 18 pairs, and the mean de...
Article
Full-text available
Both ecology and biology of the peregrine falcon are well known throughout its range. However, excepting the data from the Canary Islands, knowledge on the Barbary falcon natural history is scarce. We studied four Barbary falcon nesting sites in South-western Iran between 2011 and 2014. All eyries were located in cavities of cliffs whose average he...
Article
Full-text available
The specific spatial distribution and habitat association -strongly influenced by environmental factors or competitive interactions- are major issues in ecology and conservation. We located and georeferenced nesting sites of five cliff-nesting raptors (Egyptian vulture Neophron percnopterus, common buzzard Buteo buteo, osprey Pandion haliaetus, com...
Article
Peregrine Falcons (Falco peregrinus) on the Canary Islands are considered to be of the Barbary Falcon subspecies (F. p. pelegrinoides). Here we report on lost falconry birds present among the wild population of resident falcons, and provide rough approximations of their abundance for Tenerife, the largest island of the Canaries. We observed lost fa...
Article
Until the middle of the 20th century, the Common Raven Corvus corax was an abundant bird in the Canary Islands. However, during recent decades, populations have decreased dramatically in the most densely populated islands, apparently because of changes in land use and other anthropic activities. In the current study, we estimated raven population s...
Chapter
https://atlasaves.seo.org/ave/aguila-pescadora/
Technical Report
Esta asistencia técnica se ha desarrollado a petición del Parque Nacional del Teide, en el marco del encargo realizado a Gesplan, expediente 2017-161 de 17 de octubre de 2017, con acuerdo del Consejo de Gobierno Insular, Cabildo de Tenerife, denominado Seguimiento de Silene nocteolens y de diversos aspectos de la biología de Juniperus cedrus: censo...
Technical Report
Asistencia técnica cofinanciada por la Dirección General de Protección de la Naturaleza del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (FEDER, UE).
Technical Report
Full-text available
Este documento preliminar, elaborado para la Dirección General de Lucha contra el Cambio Climático y Medio Ambiente del Gobierno de Canarias, será puesto a exposición pública una vez finalice su periodo de evaluación.
Data
Falcons were detected by admissions to La Tahonilla Wildlife Rehabilitation Center, Cabildo de Tenerife (1998-2017), lost falcons reports issued by falconers to the Wildlife Rehabilitation Center (2007-2017), and field observations by authors (1993-2017). Territory: yes = holding territory. Paired : Yes = Mated, No = Unmated
Technical Report
Asistencia técnica cofinanciada por la Dirección General de Protección de la Naturaleza del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (FEDER, UE).
Technical Report
Full-text available
Asistencia técnica cofinanciada por la Dirección General de Protección de la Naturaleza del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (UE).
Technical Report
Asistencia técnica cofinanciada por la Dirección General de Protección de la Naturaleza del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (FEDER, UE).
Technical Report
Entre junio y septiembre de 2017 fueron equipados con técnicas de escalada los accesos a nueve nidos de águila pescadora Pandion haliaetus en las islas de Tenerife y La Gomera (cinco y cuatro, respectivamente). La condición principal en que se basaba la elección de los nidos para llevar a cabo dicho equipamiento fue el haber estado ocupados en la a...
Technical Report
Asistencia técnica cofinanciada por la Dirección General de Protección de la Naturaleza del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (FEDER, UE).
Technical Report
Asistencia técnica cofinanciada por el Ministerio de Agricultura, Alimentación y Medio Ambiente y el Fondo Europeo de Desarrollo Regional (FEDER, UE).
Article
Full-text available
Capsule: Flowers of an invasive plant species are more visited by native birds than flowers of ornithophilous endemic plants. Aims: To describe the bird guild and its behaviour visiting the century plant Agave americana in an insular environment and to determine which factors are affecting visitation rates. Methods: We noted number and species of b...
Book
Full-text available
The Teno range of mountains, located in the northwest Tenerife, Canary Islands, is still a refuge for the flora and fauna of the island. Until now, at least four native species of reptiles, 232 of birds (both breeding and migrant), and six mammals have been recorded for that site. For some of these animals, such as Canarian Spotted Lizard (Gallotia...
Article
We studied nesting habitat selection of the endangered non-migratory Osprey Pandion haliaetus population of the Canary Islands and evaluated the effect of human expansion in recent decades. Compared with randomly selected potential nest-sites, Osprey nests were more frequently found on taller, southwest-facing cliffs, char-acterized by lower human...
Article
Full-text available
Territory spacing and breeding rates of an insular population (north-western Tenerife, Canary Islands) of Barbary Falcon Falco peregrinus pelegrinoides was studied from 1993 to 2008. The population increased constantly since the outset, from two pairs in 1993 to 12 in 2008. Mean density was 5.48 pairs per 100 km and mean nearest neighbour distance...
Article
Full-text available
We studied the diet of the osprey Pandion haliaetus in the Canary Islands during 1997-2008 using prey remains under perches and nests, and direct observations. We collected data both in breeding territories and in non-breeding areas. We counted a minimum of 307 fish individuals as prey remains (both during breeding and non-breeding seasons), and id...
Article
Full-text available
The taxonomic status of the Barbary Falcon has been controversial for many years, it being variously considered a subspecies of Peregrine Falcon (Falco peregrinus pelegrinoides) or treated as a full species (F. pelegrinoides). Although morphological and molecular studies are still scarce, they suggest that subspecific status is more appropriate. Ot...
Article
Full-text available
We describe the adoption and alloparental care of fledglings by an Osprey pair during two consecutive breeding seasons (2008-09) in the small and semi-colonial cliff nesting population of Tenerife (Canary Islands). The intruding broods (two fledglings each year) switched nest a few days after fledging (≤ 10 days in 2008 and ≤ 6 in 2009). They used...
Article
Full-text available
We studied the causes of raptor admissions to the only wildlife rehabilitation center on the largest island of the Canarian Archipelago (Tenerife) over ten years (1998–2007). A total of 2611 birds of prey, belonging to nine falconiform diurnal raptor and four strigiform species, were admitted. The Eurasian Kestrel (Falco tinnunculus) and the Long-e...
Article
Full-text available
Capsule Taller and sheltered cliffs located in rugged areas are selected for breeding and only some life history traits fit the predictions of the so-called 'insular' syndrome. Aims To analyse the density and nesting habitat preferences of Buzzards on the island of Tenerife, and describe the life history traits of this population. Methods Density w...
Article
Full-text available
During the 2009 breeding season (February-June) we studied the population size of Common Raven on four islands of the Canarian archipelago. A total of 44 pairs were censused: ten in Gran Canaria, 12 in Tenerife, 17 in La Palma and five in La Gomera. Most of these pairs have their territories in ravines, gullies and sea cliffs, coinciding with or cl...
Chapter
Full-text available
A census of wintering aquatic birds in Tenerife (Canary Islands), undertaken during January 1997.
Article
Full-text available
We studied density, habitat selection and reproduction of Barbary Falcons Falco peregrinus pelegrinoides on Tenerife Island during 2004 and 2005. A total of 26 breeding pairs were counted, all of them occupying natural cliffs around the island. Density observed was 1.27 pairs/100 km2, and was positively correlated with cliff availability. Mean dist...
Article
Full-text available
During 1996 and 2006 we studied the population size and breeding success of Common Raven in Teno massif, where the majority of Tenerife reproductive pairs reside. Breeding population size remained more or less stable during the study period, varying between four (2001) and nine (2005–2006) pairs. Fledging rate (fledged chicks/successful nests) in 2...
Technical Report
Technical report for the Área de Medio Ambiente y Paisaje del Cabildo Insular de Tenerife/Oficina de Gestión del Parque Rural de Teno.
Technical Report
Technical report for the Área de Medio Ambiente y Paisaje del Cabildo Insular de Tenerife/Oficina de Gestión del Parque Rural de Teno.
Article
Full-text available
Breeding population size and some reproductive aspects of Osprey Pandion haliaetus in La Gomera and El Hierro (Canary Islands) were studied during the 2003 and 2004 breeding seasons. All active nests were situated in the southern coasts of both islands. A total of five territorial pairs were detected in La Gomera and one in El Hierro, nesting three...
Chapter
Full-text available
El Águila Pescadora se encuentra En Peligro Crítico 1 por tener una población muy pequeña (2001-2002) de unas 30-38 parejas repartidas en dos núcleos aislados (archipiélagos balear y canario).Alo largo de las décadas de los años sesenta, setenta y principios de los ochenta, sufrió una drástica disminución en sendas subpoblaciones, habiendo desapare...
Technical Report
Technical report for the Consejería de Medio Ambiente y Ordenación Territorial del Gobierno de Canarias.
Chapter
Full-text available
Especie con un área de distribución muy reducida. El escaso número de individuos, la inestabilidad geológica y el continuo pastoreo hacen que la especie se encuentre al borde de la extinción. Identificación Sufrútice de 20-50 cm de altura. Hojas pinnati-sectas, ovado-lanceoladas, glabras, excepto el margen subciliado, con recubrimiento céreo. Inflo...
Article
Full-text available
In this paper the application of conspecific playback calls for the detection of the Barn Owl (Tyto alba) in La Gomera is described, and the corresponding results are discussed in addition to presenting several supplementary observations, all of which allow a preliminary analysis of the species status in the island to be made. The very low number o...
Article
Full-text available
The waders' community of a representative zone of the typical rocky coast in the western Canary Islands is studied during an annual cycle. There are four wintering species: Charadrius hiaticula, Numenius phaeopus, Actitis hypoleucos and Arenaria interpres, dominating the last two. The highest values of abundance and richness have been obtained in t...

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Projects (2)
Project
The Barbary falcon is considered by some authors as a full species (Falco pelegrinoides) while for others it is closely related to the peregrine falcon (F. peregrinus) and therefore, it should be considered as a subspecies (F. p. pelegrinoides). Irrespective of its taxonomic status, the Barbary falcons have marked phenotypic differences, such as its small size, paler coloration, and rufous nape patches, which allow distinguishing them easily from any other peregrine subspecies. Basic knowledge on the biology and ecology of the Barbary falcon is still scarce throughout its distribution range (from the Canary Islands to South Asia through inland North Africa). However, during the last decades, we have conducted several studies addressing density, breeding biology, habitat selection and conservation on the Canarian populations. Thanks to these studies, mainly not funded, we currently know that populations are sedentary and occupy all kinds of habitats from the coast to up 2,000 m of altitude, being breeding density highly depend on the availability of high cliffs and low vegetated areas. In the Canary Islands, Barbary falcon populations have been naturally increasing in the last few decades, raising from seven known pairs in the Eastern islands in the 1987-1988 period to up to 180 in the entire archipelago in 2018. The reasons for this important population size increase are unknown, but it must be related in some degree with the current legal protections and the higher prey availability (especially feral pigeons). Although of this, not all are good news as this raptor still faces several human-related threats. In addition to collisions with man-made structures, the species is directly persecuted by hunters and pigeon-fanciers as they prey on game or domestic species and if that was not enough, the growing popularity of falconry has brought together the genetic introgression of escaped falconer’s birds with the native falcons and therefore playing some role in genetic shaping as seems to indicate our field studies. During the last years, we have conducted several field studies to evaluate the taxonomic identity, the population status, the habitat selection, habitat use and feeding habits of these falcons in the Canary Islands. In this sense, we have also started a color ringing program in order to obtain data on population dynamics (e.g. juvenile dispersal, natal philopatry, territory fidelity, adult turn-over, and survival rate). Consequently, our goals are to continue gathering basic information on these insular populations to promote future studies as well as to help in the assessment of its conservation status and needs.
Project
Since the mid-1980s we began to study the small and threatened osprey Pandion haliaetus population of the Canarian archipelago. This project, based mainly on the monitoring of Tenerife Island subpopulation, addresses principally the demographic parameters, the habitat selection and the trophic ecology. In all these years, we also studied intra- and inter-specific agonistic interactions, especially of those involving the yellow-legged gull Larus michahellis during the breeding period. In addition, in 2003 we started a ringing program with field-readable plastic rings in different islands, compiling all sightings generated by ourselves and by birdwatchers and/or nature photographers in order to obtain data on the juvenile dispersal (e.g. inter-insular movements), natal philopatry and survival rate.