Papers

Papers

BTO publishes peer-reviewed papers in a wide range of scientific journals, both independently and with our partners. If you are unable to access a scientific paper by a BTO author, please contact us.

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Breeding populations of Little Ringed Plover Charadrius dubius and Ringed Plover Charadrius hiaticula in the United Kingdom in 2007

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Published: 2019

Newly published research by BTO has shed light on the differing fortunes of two small wading bird species breeding in the UK. Little Ringed Plover first bred in the UK in Hertfordshire in 1938. Breeding numbers have increased steadily since, accompanied by a range expansion to the north and west. The species is Green-listed in the UK Birds of Conservation Concern. The Ringed Plover, by contrast, is on the UK Birds of Conservation Concern Red list. Both species were surveyed in 1984, and again in 2007. The new study estimated that the number of Little Ringed Plover breeding in the UK had risen by 71% between 1984 and 2007, to 1,239 pairs. The species’ core range remained in England, although breeding pairs have spread further into Wales, northern England and south and east Scotland. Gravel and sand pits were the favoured habitat for Little Ringed Plover, but its relative importance had declined compared to 1984. The species’ use of shingle habitat had grown, following range expansion into northern and western regions. Over the same time period, the breeding population of Ringed Plover in the UK was estimated to have fallen by 37%, to 5,438 pairs. The greatest declines were reported in England and Scotland, with numbers more stable in Wales, Northern Ireland and the Isle of Man. Decreases were marked in both coastal and inland areas, including at sites where Little Ringed Plover numbers had increased. The two species have similar inland habitat preferences, so the reasons underlying the different trends are not clear. Potential factors contributing to the decline in Ringed Plover at coastal sites include disturbance from human recreational activities as well as habitat change elsewhere. Although the UK populations of both species appear have stabilised recently, greater conservation and protection efforts are required at coastal sites to ensure local breeding numbers are prevented from dropping further.

22.01.19

Papers

Effects of tracking devices on individual birds – a review of the evidence

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Published: 2019

Newly-published work by BTO has reviewed the long-term patterns in the use of tracking devices on individual birds, and how the effects of the use of such devices are reported. More than 3,400 peer-reviewed publications were included in this review. The numbers of papers based on tracking studies increased by 4.4% per year between 1962, when this technology was first deployed, and the end of 2017. The types of ecological questions addressed with tracking devices varied between groups of species. For example, seabirds have mostly been tracked for studies on foraging and energetics, while landbirds have primarily been tracked to investigate habitat use and dispersal. Migration was the most common study topic across all species.

09.01.19

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Declining population trends of European mountain birds

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Published: 2019

Mountain areas often hold special species communities, and they are high on the list of conservation concern. Global warming and changes in human land use, such as grazing pressure and afforestation, have been suggested to be major threats for biodiversity in the mountain areas, affecting species abundance and causing distribution shifts towards mountaintops. Population shifts towards poles and mountaintops have been documented in several areas, indicating that climate change is one of the key drivers of species’ distribution changes. Despite the high conservation concern, relatively little is known about the population trends of species in mountain areas due to low accessibility and difficult working conditions. Thanks to the recent improvement of bird monitoring schemes around Europe, we can here report a first account of population trends of 44 bird species from four major European mountain regions: Fennoscandia, UK upland, south‐western (Iberia) and south‐central mountains (Alps), covering 12 countries. Overall, the mountain bird species declined significantly (-7%) during 2002–2014, which is similar to the declining rate in common birds in Europe during the same period. Mountain specialists showed a significant -10% decline in population numbers. The slope for mountain generalists was also negative, but not significantly so. The slopes of specialists and generalists did not differ from each other. Fennoscandian and Iberian populations were on average declining, while in United Kingdom and Alps, trends were nonsignificant. Temperature change or migratory behaviour was not significantly associated with regional population trends of species. Alpine habitats are highly vulnerable to climate change, and this is certainly one of the main drivers of mountain bird population trends. However, observed declines can also be partly linked with local land use practices. More efforts should be undertaken to identify the causes of decline and to increase conservation efforts for these populations.

04.01.19

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