Royal Society for the Protection of Birds

About: Royal Society for the Protection of Birds is a nonprofit organization based out in Sandy, United Kingdom. It is known for research contribution in the topics: Population & Biodiversity. The organization has 670 authors who have published 1425 publications receiving 88006 citations. The organization is also known as: RSPB & Plumage League.

A survey of breeding Wood Warblers Phylloscopus sibilatrix in Britain, 1984–1985.

Abstract: Wood Warblers were counted by tetrad within 10 km squares chosen from those occupied in The Atlas of Breeding Birds of Britain and Ireland.¸ About 80% of the planned coverage was achieved. The male population was estimated to be 17 200 with a 95% confidence range of +l- 1370. Range changes are mapped; they show no consistent pattern. As a by-product of an unrelated study, single visit counts were shown to be similar to actual numbers of males because some birds may be counted more than once. Song output was fairly constant for the period of the survey because males sing while their mates incubate. Data showing regional variations of density are mapped and tabulated by 10 km squares and by estimated area of broadleaf woodland. Wood area was a poor predictor of Wood Warbler abundance. Habitat associations in 6 separate studies were not totally consistent. Oakwoods with high canopy cover and limited herbaceous vegetation were preferred to more varied stands with more open canopies and stronger shrub and herb...

Geolocation Reveals Year-Round at-Sea Distribution and Activity of a Superabundant Tropical Seabird, the Sooty Tern Onychoprion fuscatus

Abstract: Migration is a fundamental aspect of the ecology and evolutionary history of many animals, driven by seasonal changes in resource availability and habitat structure. Seabird migration has been investigated extensively in highly seasonal temperate and polar environments. By contrast, the relationships between migration and seasonal environmental changes have rarely been studied in tropical marine habitats. The sooty tern Onychoprion fuscatus is the most abundant tropical seabirds, and has been ranked as the most important tropical species in terms of its annual estimated consumption of marine resources. We used global location sensing (GLS loggers) to describe for the first time the year-round at-sea distribution and activity patterns of sooty terns from a large breeding colony in the western Indian Ocean (Bird Island, Seychelles). While breeding, they foraged within 1,074 ± 274 km of the colony. After breeding, birds undertook an extensive post-breeding migration throughout the Indian Ocean; average distances traveled exceeded 50,000 km per individual. Sooty terns used mainly four distinct core oceanic areas during the non-breeding period; in the Bay of Bengal (A), northeast to an area straddling the Chagos-Laccadive plateau (B), southeast to an area on each side of the 90 East Ridge (C) and southwest to an area around Comoros (D). Individuals exhibited a high degree of fidelity to these core areas in successive years. We also established that they performed an unusual behavior for a non-Procellariiformes seabird; most individuals undertook a 1-month pre-laying exodus, during which they foraged in a specific area c. 2,000 km to the southeast of the colony. Year-round at-sea activity of sooty terns revealed that they spent only 3.72% of their time in contact with seawater, so indicating that they must sleep in flight. Activity parameters exhibited seasonal (breeding vs. non-breeding periods) and daily variations; they notably never land on the water at night. In the Seychelles, breeding sooty terns are threatened by commercial egg harvesting. Our discovery of extremely wide non-breeding at-sea distribution highlights the risk of other threats during their non-breeding period, such as over-fishing, marine pollution and climate change.

Effects of weather on the survival and growth of Corncrake Crex crex chicks

Abstract: Weather conditions during the early life of precocial chicks of some bird species have marked effects on survival and may also cause changes in adult population size. In this paper, we use data from broods with radiotagged mothers to examine correlations of growth rates and survival of Corncrake Crex crex chicks in Scotland and Ireland with temperature and rainfall. The loss of whole broods before they reached independence was infrequent and not correlated with temperature or rainfall. Loss of some chicks from broods before independence usually occurred and multiple regression analysis indicated that the proportion of chicks that survived increased with decreasing initial brood size, increasing temperature and decreasing rainfall. However, the magnitude of the effects of weather on survival were quite small. The rate of weight gain of chicks varied considerably within and among broods. The mean daily weight gain rate of broods decreased significantly with increasing rainfall, and variation in the weight of chicks within broods was greater for broods whose mean rate of weight gain was low.

Visitor patterns on southern heaths: a review of visitor access patterns to heathlands in the UK and the relevance to Annex I bird species.

Abstract: A number of past visitor surveys have established the range of uses to which urban heaths are subject, and the attitudes of those who use them. We have collated a number of these visitor surveys, many of which are unpublished reports relating to single sites, in order to provide a broad summary of access to heathlands. The majority of visitors to urban and suburban lowland heaths visit sites regularly and live nearby (within 5 km). A large proportion of visitors drive to sites and dog walking is the usual purpose for a visit. Visits are typically short, with the average dog walker travelling less than 2.5 km on the heath. Dog walkers typically stay on the paths, but most let their dog off the lead and consider it important to be able to do so. On large regionally or nationally known rural sites such as the New Forest, more visitors are day trippers and tourists, fewer are dog walkers, they stay for longer and their reasons for visiting differ from those of local residents. The information presented here is relevant in helping to inform decisions on the location of new housing development, and mitigating the impacts of existing and new settlements, as well as helping the heathland manager to make provision for visitors in ways that are most compatible with wildlife conservation.