Wyniki wyszukiwania

1

A new species of Dasyhelea from the Canary Islands [Diptera: Ceratopogonidae]

100%

Szadziewski R.

Polskie Pismo Entomologiczne

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2000

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tom 69

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nr 4

2

Relation between the type of wave exposure and seagrass losses (Cymodocea nodosa) in the South of Gran Canaria (Canary Islands – Spain)

86%

Portillo E.

Oceanological and Hydrobiological Studies

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2014

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tom 43

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nr 1

3

Breeding biology of the endangered Blue Chaffinch Fringilla teydea polatzeki in Gran Canaria [Canary Islands]

72%

Rodriguez F., Moreno A. C.

Acta Ornithologica

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2008

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tom 43

|

nr 2

207-215

The Blue Chaffinch is a passerine endemic to the Canary Islands and comprises two subspecies, one found on Tenerife (Fringilla teydea teydea) and the other on Gran Canaria (F. t. polatzeki). Even though the status of the Gran Canaria subspecies is endangered due to habitat loss and fragmentation, knowledge of its life history is anecdotal. We studied its breeding ecology during the years 1991-2004. New data are presented on breeding phenology, number of broods per year, egg biometrics, nest-site characteristics, breeding site fidelity and breeding success. In general, the breeding biology of the two subspecies were similar, with discrepancies in some previously reported traits, such as egg laying interval and frequency of second clutches. The Blue Chaffinch breeds earlier on Gran Canaria than on Tenerife: nests were begun mainly in the second fortnight of May. We did not find any relationship between the onset of egg laying and rainfall in March. However, the onset of the breeding period was negatively correlated with mean April temperature. The Blue Chaffinch showed preferences for a south-easterly nest orientation and for nest placement at the end of branches, where the nest is hidden by pine needles. Nests were located at various heights, from 5.5 to 23.8 m above the ground. 33% of females produced two broods a year. We found no differences in nest site characteristics between successful and unsuccessful nests, which suggests that other factors may be affecting the vulnerability of nests. The main cause of nesting failure (73.9%) was predation, due mostly to the Great Spotted Woodpecker.

4

The key role of a Ring Ouzel Tardus torquatus wintering population in seed dispersal of the endangered endemic Juniperus cedrus in an insular environment

72%

Rumeu B., Padilla D. P., Nogales M.

Acta Ornithologica

|

2009

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tom 44

|

nr 2

Although the Ring Ouzel has been considered accidental in the Canary Islands, it has been observed for the last five years in the high mountain zone of Tenerife (Canary Islands), showing it to be a regular winter visitor. Its interaction with female Juniperus cedrus cones and seeds was studied by analysing its wintering diet during January-April 2008. This juniper is endemic to the Canaries and Madeira and is classified as endangered by the IUCN. Previously, its sole long-distance disperser was known to be the Raven Corvus corax, which is unfortunately now extinct in the distribution range of J. cedrus. The results show that the diet of T. torquatus in Tenerife consists mostly of female J. cedrus cones (95% of the biomass consumed). Due to the large amount of seeds dispersed by Ring Ouzels and the effectiveness in seed germination, this winter visitor constitutes an important vector in the dispersal of J. cedrus that appears to have gone undetected in the past. This passerine plays a key role in its seed dispersal system, being able to move seeds over long distances, thus connecting fragmented populations of this plant. The present work is one of the few cases described in which a plant endemic to an oceanic island is so dependent on a winter visitor, and highlights the importance of insular environments in the wintering range of the Ring Ouzel. Owing to the absence of native long-distance seed dispersers, the future fate of this conifer is now probably dependent on the wintering population of this thrush.

5

Temporal analysis of the genetic diversity in a honey bee mating area of an island population (La Palma, Canary Islands, Spain)

72%

Munoz I., De la Rua P.

Journal of Apicultural Science

|

2012

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tom 56

|

nr 1

6

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Evaluation of Acanthamoeba isolates from environmental sources in Tenerife, Canary Islands, Spain

72%

Lorenzo-Morales J., Monteverde-Miranda C. A., Jimenez C., Tejedor M. L., Valladares B., Ortega-Rivas A.

Annals of Agricultural and Environmental Medicine

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2005

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tom 12

|

nr 2

233-236

Tests for potentially pathogenic amoebae were carried out in order to determine the presence of free-living amoebae of genus Acanthamoeba in soil and beach sand sources related to human environments in Tenerife, Canary Islands, Spain. Acanthamoeba identification was based on the morphology of cyst and trophozoite forms and PCR amplification with a genus specific primer pair. The pathogenical potential of Acanthamoeba isolates was characterized by temperature and osmotolerance assays and PCR reactions with two primer pairs related to Acanthamoeba pathogenesis. The results demonstrate the presence of potential pathogenic strain in both sources. Thus, some of the amoebae found in these habitats could act as opportunistic pathogens and may present a risk to human health.

7

Occurrence of Cryptosporidium hominis in pigeons [Columbia livia]

72%

Abreu-Acosta N., Foronda-Rodriguez P., Lopez M., Valladares B.

Acta Parasitologica

|

2009

|

tom 54

|

nr 1

1-5

This study demonstrated the presence of Cryptosporidium hominis in pigeons for the first time. Previously, C. hominis had been cited only in another bird species, Branta canadiensis. The present findings suggest that pigeons may act as mechanical vectors for this protozoan.

8

Helminth parasites in native and invasive mammal populations: comparative study on the Barbary ground squirrel Atlantoxerus getulus L. [Rodentia, Sciuridae] in Morocco and the Canary Islands

72%

Lopez-Darias M., Ribas A., Feliu C.

Acta Parasitologica

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2008

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tom 53

|

nr 3

A total of 51 and 21 adults of Barbary ground squirrels (Atlantoxerus getulus) were trapped during May–July 2006 from the introduced populations on Fuerteventura Island (Canary Islands) and the native populations in Morocco, respectively. One trematode, 1 cestode and 4 nematode species were recovered belonging to five families: Brachylaima sp. (Brachylaimidae), Catenotaenia chabaudi (Catenotaeniidae), Protospirura muricola (Spiruridae), Dermatoxys getula and Syphacia pallaryi (Oxyuuridae), and Trichostrongylus sp. (Trichostrongylidae). We report for the first time the presence of P. muricola, Trichostrongylus sp. and Brachylaima sp. in A. getulus. Brachylaima sp. was found in the insular population only, as a result of a diet that includes snails. The two oxyurids were found at both sites. The continental population showed higher species richness (5 vs 3 species). This is the first report of helminth parasites from A. getulus from the Canary Islands.

9

Seasonal variation in the diet of wild rabbits Oryctolagus cuniculus on a semiarid Atlantic island [Alegranza, Canarian Archipelago]

72%

Martin M. C., Marrero P., Nogales M.

Acta Theriologica

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2003

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tom 48

|

nr 3

The diet of the wild rabbit Oryctolagus cuniculus (Linnaeus, 1758) on Alegranza Island (Canary Islands) was studied by microhistological examination of faecal samples. We compared the presence of each food-plant species in the faeces across a year in comparison with plant availability. Two areas were studied, Llano de la Vega and La Caldera. At the first site, Suaeda vera and Chenoleoides tomentosa were the most common plants, while at the latter it was Euphorbia regis-jubae. In general, species belonging to the Chenopodiaceae were most commonly eaten by rabbits. Plants such as Chenoleoides tomentosa and Salsola vermiculata were most important in the diet in every season. Levin's niche-breadth was broader across the seasons in the study site of La Caldera than at Llano de la Vega. Furthermore, this parameter yielded the highest values (broadest niche) during the spring at both sites. Most important plants eaten by rabbits showed green vegetative parts through all seasons. Rabbits selected some plants independently of their availability, even in this reduced insular environment. The feeding behaviour of rabbits in Alegranza, selecting certain species, must have had important consequences on the composition and distribution of the vegetation over the years. This negative effect on island vegetation has been shown to occur on many oceanic islands of the world where rabbits have been introduced.

10

Age of limnic and stygobiont Amphipoda of the Madeira Archipelago and La Gomera, Canary Islands

72%

Stock J. H.

Polskie Archiwum Hydrobiologii

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1995

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tom 42

|

nr 4

11

58%

Medina F. M., Oliveira P., Menezes D., Teixeira S., Garcia R., Nogales M.

Acta Theriologica

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2010

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tom 55

|

nr 3

241-250

Feral cats Felis catus Linnaeus, 1758 have contributed to the extinction of numerous native species on islands, which are clearly sources of global biodiversity. We studied the diet of this introduced predator in the Madeira and Cape Verde archipelagos, which harbour important colonies of endangered seabirds in the high mountain habitats, and compared the results with those obtained in the same habitat in the Canary Islands, Macaronesian archipelago. On Madeira, 461 prey were identified from 143 scat groups. Mammals, overall mice, constituted the basic diet appearing in 95% of cat scats. On Fogo (Cape Verde), 657 prey items were obtained from 145 scats, and mammals were also the most important prey, reaching a frequency of occurrence of 88%. Although introduced mammals were the main prey category on all Macaronesian islands, we observed variation in feral cat diet among these islands. Birds were more frequently consumed on Madeira, lizards on Tenerife (Canaries) and invertebrates on Fogo. No specific differences were observed in relation to La Palma. We suggest that the diet composition on these islands varies according to the respective availability of the different prey types.

20

Lobiopa insularis (CASTELNAU, 1840) (Coleoptera: Nitidulidae: Nitidulinae) - an introduced beetle species new for the Palaearctic fauna

58%

Lason A., Przewozny M.

Polish Journal of Entomology

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2009

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tom 78

|

nr 4

Lobiopa insularis (CASTELNAU, 1840) was found on Canary Islands. It originates from the New World. The species is new to the Palaearctic fauna.

Ograniczanie wyników

A new species of Dasyhelea from the Canary Islands [Diptera: Ceratopogonidae]

Relation between the type of wave exposure and seagrass losses (Cymodocea nodosa) in the South of Gran Canaria (Canary Islands – Spain)

Breeding biology of the endangered Blue Chaffinch Fringilla teydea polatzeki in Gran Canaria [Canary Islands]

The key role of a Ring Ouzel Tardus torquatus wintering population in seed dispersal of the endangered endemic Juniperus cedrus in an insular environment

Temporal analysis of the genetic diversity in a honey bee mating area of an island population (La Palma, Canary Islands, Spain)

Evaluation of Acanthamoeba isolates from environmental sources in Tenerife, Canary Islands, Spain

Occurrence of Cryptosporidium hominis in pigeons [Columbia livia]

Helminth parasites in native and invasive mammal populations: comparative study on the Barbary ground squirrel Atlantoxerus getulus L. [Rodentia, Sciuridae] in Morocco and the Canary Islands

Seasonal variation in the diet of wild rabbits Oryctolagus cuniculus on a semiarid Atlantic island [Alegranza, Canarian Archipelago]

Age of limnic and stygobiont Amphipoda of the Madeira Archipelago and La Gomera, Canary Islands

Bruchidius tenerifensis, a new species of the B.cisti group from the Canary Islands [Coleoptera: Bruchidae: Bruchinae]

Prey size selection of insular lizards by two sympatric predatory bird species

Presence of Stenoponia tripectinata (Tiraboschi, 1902) (Siphonaptera, Ctenophtalmidae) in murine (Rodentia) from the Canary Islands

New records of grey cutthroat, Synaphobranchus affinis (Actinopterygii: Anguilliformes: Synaphobranchidae), from the eastern-central Atlantic Ocean

Parasite fauna of rodents (Murinae) from El Hierro (Canary Islands, Spain): a multidisciplinary approach

Helminth parasites of the Atlantic chub mackerel, Scomber colias Gmelin, 1789 from Canary Islands, Central North Atlantic, with comments on their relations with other Atlantic regions

Seasonal diet of the Grey Heron Ardea cinerea on an oceanic island [Tenerife, Canary Islands]: indirect interaction with wild seed plants

Breeding biology of Grey Wagtail Motacilla cinerea canariensis on Tenerife, Canary Islands

Trophic habits of feral cats in the high mountain shrublands of the Macaronesian islands [NW Africa, Atlantic Ocean]

Lobiopa insularis (CASTELNAU, 1840) (Coleoptera: Nitidulidae: Nitidulinae) - an introduced beetle species new for the Palaearctic fauna