Pub Date : 2020-05-13DOI: 10.1080/03078698.2019.1759909
Natalie A. Kelsey, Heiko Schmaljohann, F. Bairlein
Knowledge about fuel load of migratory birds is important for understanding their migration in general, as it affects for example departure decisions from stopovers and the distance to fly. In fiel...
{"title":"A handy way to estimate lean body mass and fuel load from wing length: a quantitative approach using magnetic resonance data","authors":"Natalie A. Kelsey, Heiko Schmaljohann, F. Bairlein","doi":"10.1080/03078698.2019.1759909","DOIUrl":"https://doi.org/10.1080/03078698.2019.1759909","url":null,"abstract":"Knowledge about fuel load of migratory birds is important for understanding their migration in general, as it affects for example departure decisions from stopovers and the distance to fly. In fiel...","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03078698.2019.1759909","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46546701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-07DOI: 10.1080/03078698.2019.1759896
R. Reese, J. Tucker
{"title":"Descriptive models for first-arrival dates of migrants in an inland UK county","authors":"R. Reese, J. Tucker","doi":"10.1080/03078698.2019.1759896","DOIUrl":"https://doi.org/10.1080/03078698.2019.1759896","url":null,"abstract":"","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03078698.2019.1759896","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48259274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.1974527
B. Czyż, L. Hałupka, Monika Czuchra
ABSTRACT In May 2020, during our study on the breeding ecology of the Eurasian Reed Warbler Acrocephalus scirpaceus, we found two nests of Common Blackbird built within an unmanaged reedbed. The distance between the nests and dry land, overgrown by deciduous forest, was about 25 m. One of the nesting attempts was successful while the second was deserted during the incubation stage. To our knowledge this is the first record of Blackbirds nesting in reeds. This observation supports the notion of great flexibility of nest-site selection in this species. We conclude that Blackbirds use reedbeds as a nesting site more often, but such nests may be easily overlooked.
{"title":"First record of Common Blackbird Turdus merula nests built in a reedbed","authors":"B. Czyż, L. Hałupka, Monika Czuchra","doi":"10.1080/03078698.2021.1974527","DOIUrl":"https://doi.org/10.1080/03078698.2021.1974527","url":null,"abstract":"ABSTRACT In May 2020, during our study on the breeding ecology of the Eurasian Reed Warbler Acrocephalus scirpaceus, we found two nests of Common Blackbird built within an unmanaged reedbed. The distance between the nests and dry land, overgrown by deciduous forest, was about 25 m. One of the nesting attempts was successful while the second was deserted during the incubation stage. To our knowledge this is the first record of Blackbirds nesting in reeds. This observation supports the notion of great flexibility of nest-site selection in this species. We conclude that Blackbirds use reedbeds as a nesting site more often, but such nests may be easily overlooked.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"21 - 23"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48164625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.1977839
L. Jenni, Gabriele Hilke Peter
ABSTRACT Usually, some measurements are taken from birds caught for ringing, for example to differentiate between species, subspecies or sexes, or to obtain a measure of body size or energy stores. However, the ecomorphological interpretation of standard measures of the flight apparatus is often difficult, because flight models need parameters that are not among the standard measures taken by field ornithologists. Therefore we evaluated on dead European Robins Erithacus rubecula and Eurasian Blackcaps Sylvia atricapilla how well a suite of measures that can be easily taken on a live bird is correlated with the aerodynamically relevant parameters wingspan, wing area, wing chord, aspect ratio and wing pointedness. We found that wing chord is well correlated with the length of secondary 2, wingspan with the length of the primary that forms the wingtip of the spread wing, and wing area with the length of the longest primary. Aspect ratio and wing pointedness were poorly correlated with alternative measures. Compound measures did not significantly improve these relationships, while some multivariate models did. From the limited data set of this study, it seems that aerodynamically relevant parameters can be substituted to a certain extent by measures that can easily be taken from live birds or museum skins. This may serve intraspecific studies in which data from live birds or museum skins are collected with the aim of interpreting their flight performance in a correlative way.
{"title":"Can measures for modelling bird flight be replaced by measures taken easily on live birds and museum skins?","authors":"L. Jenni, Gabriele Hilke Peter","doi":"10.1080/03078698.2021.1977839","DOIUrl":"https://doi.org/10.1080/03078698.2021.1977839","url":null,"abstract":"ABSTRACT Usually, some measurements are taken from birds caught for ringing, for example to differentiate between species, subspecies or sexes, or to obtain a measure of body size or energy stores. However, the ecomorphological interpretation of standard measures of the flight apparatus is often difficult, because flight models need parameters that are not among the standard measures taken by field ornithologists. Therefore we evaluated on dead European Robins Erithacus rubecula and Eurasian Blackcaps Sylvia atricapilla how well a suite of measures that can be easily taken on a live bird is correlated with the aerodynamically relevant parameters wingspan, wing area, wing chord, aspect ratio and wing pointedness. We found that wing chord is well correlated with the length of secondary 2, wingspan with the length of the primary that forms the wingtip of the spread wing, and wing area with the length of the longest primary. Aspect ratio and wing pointedness were poorly correlated with alternative measures. Compound measures did not significantly improve these relationships, while some multivariate models did. From the limited data set of this study, it seems that aerodynamically relevant parameters can be substituted to a certain extent by measures that can easily be taken from live birds or museum skins. This may serve intraspecific studies in which data from live birds or museum skins are collected with the aim of interpreting their flight performance in a correlative way.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"6 - 15"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44017492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.2001676
L. Bozó, Erna Bozóné Borbáth
ABSTRACT Secondary wooded habitats provide suitable habitat for many bird species during autumn migration, and they also have an important role in migratory connectivity. In this study, we examined the migration timing and stopover ecology of the European Robins Erithacus rubecula migrating through a bird ringing station in southeastern Hungary. The ringing site is dominated by oleaster Elaeagnus angustifolia mixed with different berries and other shrubs and trees. The fieldwork covered the five years 2016–20, from early August to late October. For the analyses, we used data from a total of 725 ringed and 126 recaptured individuals. Our results show that these secondary habitats play an important role in the migration of this species. Birds migrated through the study site later than in other parts of Hungary, due to its southerly location. The rate of change in body mass was lower than that found at other locations in Europe, but the stopover duration was similar. The rate of change in body mass was influenced by the duration of stopover. Our findings highlight the importance of these secondary habitats in the farmland environment.
{"title":"Migration and stopover ecology of European Robins Erithacus rubecula in an oleaster forest in southeastern Hungary","authors":"L. Bozó, Erna Bozóné Borbáth","doi":"10.1080/03078698.2021.2001676","DOIUrl":"https://doi.org/10.1080/03078698.2021.2001676","url":null,"abstract":"ABSTRACT Secondary wooded habitats provide suitable habitat for many bird species during autumn migration, and they also have an important role in migratory connectivity. In this study, we examined the migration timing and stopover ecology of the European Robins Erithacus rubecula migrating through a bird ringing station in southeastern Hungary. The ringing site is dominated by oleaster Elaeagnus angustifolia mixed with different berries and other shrubs and trees. The fieldwork covered the five years 2016–20, from early August to late October. For the analyses, we used data from a total of 725 ringed and 126 recaptured individuals. Our results show that these secondary habitats play an important role in the migration of this species. Birds migrated through the study site later than in other parts of Hungary, due to its southerly location. The rate of change in body mass was lower than that found at other locations in Europe, but the stopover duration was similar. The rate of change in body mass was influenced by the duration of stopover. Our findings highlight the importance of these secondary habitats in the farmland environment.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"24 - 31"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46070049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.2001227
R. H. Walker, R. Robinson, C. Barimore, J. Blackburn, L. Barber, Hazel E. McCambridge, R. Green, Diana X. de Palacio, M. Grantham, Bridget M. Griffin, S. Schäfer, Ian D. Woodward, D. Leech
ABSTRACT This is the 82nd annual report of the British Trust for Ornithology’s Ringing Scheme, incorporating the report of the Nest Record Scheme and covering work carried out and data processed in 2018. We reviewed the literature on tracking devices to assess the impact of their use on individual birds. More than 3400 studies were identified, the first dating back to the early 1960s. The ecological questions being studied varied, with migration being the most common study subject. The frequency of effects was significantly related to attachment type and the likelihood of adverse effects was related to device weight. The proportion of studies reporting adverse effects has declined over time and the research highlighted the need for systematic documentation of potential effects. NRS and CES data were used in a collaborative study which investigated mismatches between the timing of breeding for 21 British songbirds and the availability of food for their chicks. Results indicate that birds did breed later in warmer springs relative to the timing of spring; however, this did not have a significant impact on long-term breeding success. In 2018, 135 CE sites submitted data. Long-term (1984–2017) declines in abundance were observed in six migrant, one partial migrant and three resident species while long-term increases in abundance continue to be recorded in two short-distance migrants and four resident species. Seven species are exhibiting significant long-term declines in productivity; only two species, Reed Warbler Acrocephalus scirpaceus and Chaffinch Fringilla coelebs, are exhibiting a significant long-term increase in productivity. Long-term trends in survival indicate increases for 12 species and declines for eight. Compared to the five-year mean (2013–17), the abundance of 14 species decreased significantly in 2018 with five species being recorded in lower numbers than in any previous year since CES monitoring began. No significant increases in abundance were recorded. Productivity increased significantly for six migrant and four resident species in 2018 and decreased for only two species (both residents). Significant declines in survival rates were observed in 10 species in 2018 compared to the five-year mean. The number of Retrapping Adults for Survival submissions fell slightly in 2018 to 190; eight projects ran for the first time. In total, 58 species were monitored, with Pied Flycatcher Ficedula hypoleuca (23 projects), House Sparrow Passer domesticus (18), Starling Sturnus vulgaris (17), Sand Martin Riparia riparia (13) and Reed Warbler (10) the most-studied species. A total of 982 858 birds were ringed during the year, comprising 170 619 nestlings, 465 610 first-year birds, 319 955 adults (birds in their second calendar year or older) and 26 674 birds whose age could not be determined. In addition, there were 236 314 recaptures of ringed birds at or near the ringing site. In total, 54 324 recoveries (birds found dead, recaptured or resigh
{"title":"Bird ringing and nest recording in Britain and Ireland in 2018","authors":"R. H. Walker, R. Robinson, C. Barimore, J. Blackburn, L. Barber, Hazel E. McCambridge, R. Green, Diana X. de Palacio, M. Grantham, Bridget M. Griffin, S. Schäfer, Ian D. Woodward, D. Leech","doi":"10.1080/03078698.2021.2001227","DOIUrl":"https://doi.org/10.1080/03078698.2021.2001227","url":null,"abstract":"ABSTRACT This is the 82nd annual report of the British Trust for Ornithology’s Ringing Scheme, incorporating the report of the Nest Record Scheme and covering work carried out and data processed in 2018. We reviewed the literature on tracking devices to assess the impact of their use on individual birds. More than 3400 studies were identified, the first dating back to the early 1960s. The ecological questions being studied varied, with migration being the most common study subject. The frequency of effects was significantly related to attachment type and the likelihood of adverse effects was related to device weight. The proportion of studies reporting adverse effects has declined over time and the research highlighted the need for systematic documentation of potential effects. NRS and CES data were used in a collaborative study which investigated mismatches between the timing of breeding for 21 British songbirds and the availability of food for their chicks. Results indicate that birds did breed later in warmer springs relative to the timing of spring; however, this did not have a significant impact on long-term breeding success. In 2018, 135 CE sites submitted data. Long-term (1984–2017) declines in abundance were observed in six migrant, one partial migrant and three resident species while long-term increases in abundance continue to be recorded in two short-distance migrants and four resident species. Seven species are exhibiting significant long-term declines in productivity; only two species, Reed Warbler Acrocephalus scirpaceus and Chaffinch Fringilla coelebs, are exhibiting a significant long-term increase in productivity. Long-term trends in survival indicate increases for 12 species and declines for eight. Compared to the five-year mean (2013–17), the abundance of 14 species decreased significantly in 2018 with five species being recorded in lower numbers than in any previous year since CES monitoring began. No significant increases in abundance were recorded. Productivity increased significantly for six migrant and four resident species in 2018 and decreased for only two species (both residents). Significant declines in survival rates were observed in 10 species in 2018 compared to the five-year mean. The number of Retrapping Adults for Survival submissions fell slightly in 2018 to 190; eight projects ran for the first time. In total, 58 species were monitored, with Pied Flycatcher Ficedula hypoleuca (23 projects), House Sparrow Passer domesticus (18), Starling Sturnus vulgaris (17), Sand Martin Riparia riparia (13) and Reed Warbler (10) the most-studied species. A total of 982 858 birds were ringed during the year, comprising 170 619 nestlings, 465 610 first-year birds, 319 955 adults (birds in their second calendar year or older) and 26 674 birds whose age could not be determined. In addition, there were 236 314 recaptures of ringed birds at or near the ringing site. In total, 54 324 recoveries (birds found dead, recaptured or resigh","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"35 - 82"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44515731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.1974528
Edgar Bernat-Ponce
ABSTRACT This study reviews the classic method of using superglue to seal coloured plastic split-rings in 198 House Sparrows. Four birds of 50 individuals recaptured by mist net (8%) and 17 birds of 147 resighted individuals (11.6%) had lost or removed at least one coloured ring. These removal rates are much lower than in similar studies without superglue (18–40%). Sealing the edges of coloured plastic split-rings with superglue is a cheap, safe, efficient, and easy way to reduce their removal in some small bird species with stout beaks.
{"title":"Reviewing a classic but effective method to reduce colour-ring removal by stout-billed birds: a case study in House Sparrows","authors":"Edgar Bernat-Ponce","doi":"10.1080/03078698.2021.1974528","DOIUrl":"https://doi.org/10.1080/03078698.2021.1974528","url":null,"abstract":"ABSTRACT This study reviews the classic method of using superglue to seal coloured plastic split-rings in 198 House Sparrows. Four birds of 50 individuals recaptured by mist net (8%) and 17 birds of 147 resighted individuals (11.6%) had lost or removed at least one coloured ring. These removal rates are much lower than in similar studies without superglue (18–40%). Sealing the edges of coloured plastic split-rings with superglue is a cheap, safe, efficient, and easy way to reduce their removal in some small bird species with stout beaks.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"32 - 34"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43250539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/03078698.2021.2001675
T. Murray, Alyn J. Walsh, David Daly
ABSTRACT Lady’s Island Lake, County Wexford, is Ireland’s largest Sandwich Tern colony. Once chicks fledge, they leave the colony and become relatively scarce locally. This project set out to establish where the young birds go, and for how long. Field-readable rings were used from 2015 to 2019 and five years’ worth of post-fledging dispersal data are analysed from field records. While birds depart in all directions, a significant proportion moves northward into the Irish Sea, with a preference for the eastern side of the Irish Sea.
{"title":"Post-fledging dispersal of juvenile Sandwich Terns from Lady’s Island Lake, County Wexford, Ireland","authors":"T. Murray, Alyn J. Walsh, David Daly","doi":"10.1080/03078698.2021.2001675","DOIUrl":"https://doi.org/10.1080/03078698.2021.2001675","url":null,"abstract":"ABSTRACT Lady’s Island Lake, County Wexford, is Ireland’s largest Sandwich Tern colony. Once chicks fledge, they leave the colony and become relatively scarce locally. This project set out to establish where the young birds go, and for how long. Field-readable rings were used from 2015 to 2019 and five years’ worth of post-fledging dispersal data are analysed from field records. While birds depart in all directions, a significant proportion moves northward into the Irish Sea, with a preference for the eastern side of the Irish Sea.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"35 1","pages":"16 - 20"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49484357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-03DOI: 10.1080/03078698.2019.1840759
M. Dimaki, H. Alivizatos, P. Kokkini
ABSTRACT The aim of this study is to describe the phenology of migration, biometrics and fat storage for Golden Orioles Oriolus oriolus (Linnaeus, 1758) mist-netted for ringing on Antikythira Island (southern Greece); the migration phenology of the species is described for the first time in Greece. The data suggest that spring passage through the Mediterranean Basin occurs between mid-April and late May, and autumn passage between late August and late September. Most birds paused their migration on Antikythira only briefly, between successive nocturnal flights. The range of wing length of the species was 140–178 mm and of tarsus length 19.5–26.4 mm (mean 22.8 mm). Males were found to have a longer mean wing length than females (males 154 mm, females 152 mm) but no difference was found in the tarsus length between sexes or ages. Weight in spring ranged from 46.2 g to 88 g (mean 60.9 g) and in autumn was 61–104 g (mean 84.8 g). Fat scores were much higher in autumn than in spring.
{"title":"Ringing studies of the Golden Oriole Oriolus oriolus (Aves: Oriolidae) during passage through Antikythira Island, southwestern Greece","authors":"M. Dimaki, H. Alivizatos, P. Kokkini","doi":"10.1080/03078698.2019.1840759","DOIUrl":"https://doi.org/10.1080/03078698.2019.1840759","url":null,"abstract":"ABSTRACT The aim of this study is to describe the phenology of migration, biometrics and fat storage for Golden Orioles Oriolus oriolus (Linnaeus, 1758) mist-netted for ringing on Antikythira Island (southern Greece); the migration phenology of the species is described for the first time in Greece. The data suggest that spring passage through the Mediterranean Basin occurs between mid-April and late May, and autumn passage between late August and late September. Most birds paused their migration on Antikythira only briefly, between successive nocturnal flights. The range of wing length of the species was 140–178 mm and of tarsus length 19.5–26.4 mm (mean 22.8 mm). Males were found to have a longer mean wing length than females (males 154 mm, females 152 mm) but no difference was found in the tarsus length between sexes or ages. Weight in spring ranged from 46.2 g to 88 g (mean 60.9 g) and in autumn was 61–104 g (mean 84.8 g). Fat scores were much higher in autumn than in spring.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"34 1","pages":"113 - 119"},"PeriodicalIF":0.0,"publicationDate":"2019-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03078698.2019.1840759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42797691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-03DOI: 10.1080/03078698.2020.1830521
Lucy Ferrer, S. Newman, Sophie Barker, F. Cooke
ABSTRACT Timed sea-watches were carried out at Holme Bird Observatory, Norfolk, UK, between May 2005 and December 2015. The rate of passage of 20 species was calculated as the number of birds passing the observation point per 10 hours. Analysis of the rate of passage by month enabled the species to be grouped into autumn passage migrants, summer visitors, winter visitors and species present throughout the year. There was no obvious spring passage of seabirds at the site. Wind strength and direction proved to be the most important environmental variables affecting seabird presence. Six autumn passage migrants (Manx Shearwater Puffinus puffinus, Gannet Morus bassanus, Great Skua Stercorarius skua, Arctic Skua Stercorarius parasiticus, Little Auk Alle alle and Kittiwake Rissa tridactyla) were most numerous when the wind was strong and northerly, conditions which favoured birds in the North Sea being blown towards the Norfolk coast. Two summer visitors (Sandwich Tern Thalasseus sandvicensis and Common Tern Sterna hirundo) were most numerous in weak winds and at low tide, conditions which may have favoured short feeding movements. Some species (e.g. Teal Anas crecca and Fulmar Fulmarus glacialis) were more numerous in the morning, but others (e.g. Kittiwake and Little Auk) were more numerous in the afternoon. Systematic observation over a 10-year period provided an enhanced understanding of the seasonal variation of different species seen offshore, and of the environmental factors that influence their movements.
{"title":"Sea-watching at Holme Bird Observatory, Norfolk, 2005 to 2015","authors":"Lucy Ferrer, S. Newman, Sophie Barker, F. Cooke","doi":"10.1080/03078698.2020.1830521","DOIUrl":"https://doi.org/10.1080/03078698.2020.1830521","url":null,"abstract":"ABSTRACT Timed sea-watches were carried out at Holme Bird Observatory, Norfolk, UK, between May 2005 and December 2015. The rate of passage of 20 species was calculated as the number of birds passing the observation point per 10 hours. Analysis of the rate of passage by month enabled the species to be grouped into autumn passage migrants, summer visitors, winter visitors and species present throughout the year. There was no obvious spring passage of seabirds at the site. Wind strength and direction proved to be the most important environmental variables affecting seabird presence. Six autumn passage migrants (Manx Shearwater Puffinus puffinus, Gannet Morus bassanus, Great Skua Stercorarius skua, Arctic Skua Stercorarius parasiticus, Little Auk Alle alle and Kittiwake Rissa tridactyla) were most numerous when the wind was strong and northerly, conditions which favoured birds in the North Sea being blown towards the Norfolk coast. Two summer visitors (Sandwich Tern Thalasseus sandvicensis and Common Tern Sterna hirundo) were most numerous in weak winds and at low tide, conditions which may have favoured short feeding movements. Some species (e.g. Teal Anas crecca and Fulmar Fulmarus glacialis) were more numerous in the morning, but others (e.g. Kittiwake and Little Auk) were more numerous in the afternoon. Systematic observation over a 10-year period provided an enhanced understanding of the seasonal variation of different species seen offshore, and of the environmental factors that influence their movements.","PeriodicalId":35936,"journal":{"name":"Ringing and Migration","volume":"34 1","pages":"131 - 141"},"PeriodicalIF":0.0,"publicationDate":"2019-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03078698.2020.1830521","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41942273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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