Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)

From 1985 to 2014, we monitored numbers of Red Knots Calidris canutus of the subspecies rufa occurring at Punta Rasa, Samborombón Bay, Buenos Aires province, Argentina during northward migration (March to April), and in the austral winter (mid-May to mid-August), when some knots, mainly immatures, r...

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Autores principales: Martínez-Curci, N.S., Bremer, E., Azpiroz, A.B., Battaglia, G.E., Salerno, J.C., Isacch, J.P., González, P.M., Castresana, G.J., Rojas, P.
Formato: JOUR
Materias:
Calidris canutus rufa
Over-summering
Punta Rasa
Red Knot
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_20588410_v122_n3_p236_MartinezCurci
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_20588410_v122_n3_p236_MartinezCurci
record_format dspace
spelling todo:paper_20588410_v122_n3_p236_MartinezCurci2023-10-03T16:39:07Z Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014) Martínez-Curci, N.S. Bremer, E. Azpiroz, A.B. Battaglia, G.E. Salerno, J.C. Isacch, J.P. González, P.M. Castresana, G.J. Rojas, P. Calidris canutus rufa Over-summering Punta Rasa Red Knot South America From 1985 to 2014, we monitored numbers of Red Knots Calidris canutus of the subspecies rufa occurring at Punta Rasa, Samborombón Bay, Buenos Aires province, Argentina during northward migration (March to April), and in the austral winter (mid-May to mid-August), when some knots, mainly immatures, remain in South America during the breeding season. Numbers occurring during northward migration declined over the monitoring period from a peak of 3,640 in 1987 to 168 in 2014. This is consistent with the concurrent decline of the main Tierra del Fuego wintering population (though the percentage of the Tierra del Fuego population stopping at Punta Rasa also declined from 5.4% to 1.3%). Numbers occurring at Punta Rasa during the austral winter have also declined, but not to the same extent and for the past decade more have been counted during the austral winter than during northward migration. Among those seen at Punta Rasa during the Arctic breeding season have been some with large amounts of rufous breeding plumage. The percentage of such birds has increased from 10–15% in 1987 to 19–54% during 2011–2014. Moreover, observations of individually marked birds show that some of those showing breeding plumage are mature adults, at least 3–7 years old. Conservation actions are required to manage Punta Rasa for the small but important numbers of Red Knots that occur there. Further research is needed to determine why some mature adults do not go to their Arctic breeding grounds and thereby fail to contribute to reproduction. © 2015, International Wader Study Group. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20588410_v122_n3_p236_MartinezCurci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Calidris canutus rufa
Over-summering
Punta Rasa
Red Knot
South America
spellingShingle Calidris canutus rufa
Over-summering
Punta Rasa
Red Knot
South America
Martínez-Curci, N.S.
Bremer, E.
Azpiroz, A.B.
Battaglia, G.E.
Salerno, J.C.
Isacch, J.P.
González, P.M.
Castresana, G.J.
Rojas, P.
Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
topic_facet Calidris canutus rufa
Over-summering
Punta Rasa
Red Knot
South America
description From 1985 to 2014, we monitored numbers of Red Knots Calidris canutus of the subspecies rufa occurring at Punta Rasa, Samborombón Bay, Buenos Aires province, Argentina during northward migration (March to April), and in the austral winter (mid-May to mid-August), when some knots, mainly immatures, remain in South America during the breeding season. Numbers occurring during northward migration declined over the monitoring period from a peak of 3,640 in 1987 to 168 in 2014. This is consistent with the concurrent decline of the main Tierra del Fuego wintering population (though the percentage of the Tierra del Fuego population stopping at Punta Rasa also declined from 5.4% to 1.3%). Numbers occurring at Punta Rasa during the austral winter have also declined, but not to the same extent and for the past decade more have been counted during the austral winter than during northward migration. Among those seen at Punta Rasa during the Arctic breeding season have been some with large amounts of rufous breeding plumage. The percentage of such birds has increased from 10–15% in 1987 to 19–54% during 2011–2014. Moreover, observations of individually marked birds show that some of those showing breeding plumage are mature adults, at least 3–7 years old. Conservation actions are required to manage Punta Rasa for the small but important numbers of Red Knots that occur there. Further research is needed to determine why some mature adults do not go to their Arctic breeding grounds and thereby fail to contribute to reproduction. © 2015, International Wader Study Group. All rights reserved.
format JOUR
author Martínez-Curci, N.S.
Bremer, E.
Azpiroz, A.B.
Battaglia, G.E.
Salerno, J.C.
Isacch, J.P.
González, P.M.
Castresana, G.J.
Rojas, P.
author_facet Martínez-Curci, N.S.
Bremer, E.
Azpiroz, A.B.
Battaglia, G.E.
Salerno, J.C.
Isacch, J.P.
González, P.M.
Castresana, G.J.
Rojas, P.
author_sort Martínez-Curci, N.S.
title Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
title_short Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
title_full Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
title_fullStr Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
title_full_unstemmed Annual occurrence of Red Knot Calidris canutus rufa at Punta Rasa, Samborombón Bay, Argentina, over a 30-year period (1985–2014)
title_sort annual occurrence of red knot calidris canutus rufa at punta rasa, samborombón bay, argentina, over a 30-year period (1985–2014)
url http://hdl.handle.net/20.500.12110/paper_20588410_v122_n3_p236_MartinezCurci
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