1,783 research outputs found
Observacions de la dispersió ornitòcora del llampúdol (Rhamnus alaternus)
Observations of the ornithochoral dispersion of the Mediterranean Buckthorn (Rhamnus alaternus). Between May 24th and June 3rd of 1994 a total of 5 1/2 hours were devoted to the systematic observations of the birds coming to eat the fruit of the Mediterranean buckthorn (Rhmnnus alaternus) on a property in the center of Mallorca. Of the 5 species of bird who are potential consumers (and dispersers) of the fruit, only 2 were seen eating them: the Sardinian warbler (Sylvia rnelanocephala) and Marmora's warbler (Sylvia sarda). Thirty-five of the recorded feeding visits were of the S. melanocephala, involving the removal of 43 fruits. Only 3 of the visits were of the S. sarda (1 fruit caten in each of them), but it should be noted that the density of this species in the area studied seems considerably lower than that of the first.' The short duration of the visits of the S. melanocephala, and especially the fact that in over half of them the bird left without swallowing the last fruit handled, suggests that this warbler is using the fruit to supplement the diet of its young
Noves dades de cria de Busqueret garriguer (Sylvia cantillans) a Mallorca
New data on the reproduction of Subalpine Warbler (Sylvia cantillans) in Mallorca. During the summer of 1996 (may-june) a series of observations of Subalpine Warbler (Sylvia cantillans moltonii) took place in six different localities of Mallorca and in the island Dragonera. In three of these zones its presence was known (reproduction confirmed in two of them), while in the other four there had been no record of the species. From the presented records and its behaviour (powerful response to a call) one can infer that it breeds in all thee localities, with the exception of Dragonera, where at the end of may only migrant birds could have been recorded. Some notes concerning its habitat are included, and it is suggested that the species could be breeding in other zones of Mallorca and Menorca where there is a suitable habitat
Seguiment de caixes-niu per a aucells insectÃvors en el centre de Mallorca. Esbós dels resultats
Es presenten els resultats generals de sis anys de seguiment de caixes-niu per a aucells insectÃvors en set boscos del centre de Mallorca (cinc pinars i dos alzinars). L’espècie que amb més freqüència va criar a les caixes va ser el ferrerico (Parus major), amb % d’ocupació significatius a partir del segon any. En els pinars s’obtingueren ocupacions d’entre 30-60%, i en els alzinars varen ser un poc majors (en un d’ells només el darrer any). Per tant, sembla que les caixes afavoreixen el creixement demogrà fic del ferrerico, que és un predador d’erugues i papallones de processionà ria. La competència pels forats i la depredació per part de rata cellarda (Eliomys quercinus) i rata negra (Rattus rattus) poden ser factors importants en la regulació de les poblacions d’aucells que nien en forats
Breeding of Dardford Warbler Sylvia undata in Mallorca
Nidificación de la curruca rabilarga Sylvia undata a Mallorca. Se presenta la existencia de una población reproductora (y posiblemente sedentaria) de currruca rabilarga Sylvia undata en dos áreas del NE de Mallorca. Las evidencias presentadas son las observaciones de machos territoriales durante las primaveras de 1997 y 1998, observaciones de un juvenil (verano de 1997), un grupo familiar y un nido con tres pollos (primavera de 1998), y la captura de ejemplares adultos con la muda postnupcial activa entre septiembre y noviembre de 1997. La coloración de estos individuos coincide con la descrita para la subespecie nominal. La aparente baja densidad, y la falta de registros estivales durante las últimas décadas, sugieren una colonización muy reciente, quizá a partir de la población sedentaria de Menorca
Estat de conservació de les praderies de Posidonia oceanica (Linnaeus) Delile, 1813 dins la Badia de Portocolom (Mallorca)
[cat] Posidonia oceanica (Linnaeus), Delile, 1813 és una fanerògama marina endèmica del Mediterrani que proporciona gran quantitat de serveis ecosistèmics i és clau per a la conservació de la biodiversitat. Com la majoria de la vegetació marina està en greu recessió. Una de les principals amenaces que afecten aquesta planta, juntament amb l’eutrofització i l’escalfament global, és el fondeig incontrolat. En aquest estudi fem una avaluació de l’estat de conservació de la praderia de P. oceanica situada davant la platja de s’Arenal a la badia de Portocolom afectada per fondeig incontrolat. La mitjana del percentatge de cobertura entre una fondà ria de 2 i 4.8 metres va ser de 44.2 ± 13.6 %, cobertures inferiors a les reportades anteriorment per aquesta zona. Les densitats van variar entre 392 i 576 feixos/m2, amb una mitjana de 508 ± 31 feixos/m2. Aquesta praderia té molt baixa densitat, o densitat anormal, indicant que està sotmesa a pressions que posen en perill el seu estat de conservació. Vam poder estimar el nombre de feixos arrabassats per una à ncora d’un vaixell d’uns 15 metres d’eslora, que va ser de 165 ± 31 feixos. Aquesta praderia necessitaria 5 anys en condicions òptimes per poder recolonitzar l’à rea arrabassada per aquesta à ncora. Una estima del carboni alliberat per l’efecte del fondeig d’aquesta à ncora revelaria que 915 g de carboni quedaria disponible i podria ser alliberat a l’atmosfera.[eng] Posidonia oceanica (Linnaeus), Delile, 1813 is an endemic Mediterranean seagrass that provides multiple ecosystem services and is a key species for biodiversity conservation. Like most submerged vegetation, this key habitat is regressing alarmingly. One of the main threats affecting this seagrass, together with eutrophication and global warming, is uncontrolled anchoring. Here, we evaluate the conservation status of the P. oceanica meadow in front of s’Arenal beach in Portocolom Bay that is affected by uncontrolled anchoring. The mean cover percentage at depths between 2 and 4.8 meters was 44.2 ± 13.6 %, lower than previously reported for this area. Densities varied between 392 and 576 shoots/m2, with an average of 508 ± 31 shoots/m2. This is a very low, or even an abnormal, density, indicating that this meadow is subject to pressures that are threatening its conservation. We could estimate the number of shoots that were torn off by the action of anchoring of a 15 m long boat: 165 ± 31 shoots. This meadow would require 5 years of optimal conditions to be able to recolonize the area removed by the action of this anchoring. An estimate of the carbon released by the action of this anchoring was 915 g of carbon that could become available and could be released to the atmosphere
Hipoparatiroidismo primario idiopático felino. Caso clÃnico
Se describe un caso clÃnico de hipoparatiroidismo primario idiopático, en un gato macho de 2 años y medio de edad, que se presentó en nuestro hospital con un cuadro de anorexia, temblores, cambio de comportamiento, agresividad y alteraciones neurológicas. La analÃtica sanguÃnea reveló una hipocalcemia importante. Una vez descartados el resto de diagnósticos diferenciales de hipocalcemia, la presencia de unos niveles de PTH anormalmente bajos en presencia de hipocalcemia severa, permitió emitir diagnóstico de hipoparatiroidismo primario idiopático. El paciente respondió adecuadamente al tratamiento hospitalario de urgencia y actualmente recibe medicación oral, uno de cada 4 dÃas, y no presenta ninguna sintomatologÃa relaiconada ni efectos secundarios.
On the presence of recent introduced alien fresh water tortoises in the Mallorca island
Abstract not availabl
Nota sobre el comportament alimentari de la baldritja balear Puffinus mauretanicus
Notes on the foraging behaviour of the Balearic shearwater Puffinus mauretanicus. This note describes the foraging behaviour of a mixed flock of Balearic and Levantine shearwaters, observed during the month of January, just off the coast of Mallorca. The birds moved in a group and dived in the sea with hthe wings partially folded. A second immersion on the same spot started on the sea surface, but then the birds had their heads underwater looking for a potential prey. The wings were beaten underwater. Sometimes the depth reached was a few centimetres under the surface, but also, depths of up to two metres were reached. The maximum period underwater was 30 seconds, and all the prey was swallowed before surfacing
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