Isotopic (δ2 Hf ) evidence of “loop migration” and use of the Gulf of Maine Flyway by both western and eastern breeding populations of Blackpoll Warblers

2015 ◽  
Vol 86 (3) ◽  
pp. 213-228 ◽  
Author(s):  
Rebecca L. Holberton ◽  
Steven L. Van Wilgenburg ◽  
Adrienne J. Leppold ◽  
Keith A. Hobson
Keyword(s):  
Gulf Of Maine ◽  
Breeding Populations ◽  
Loop Migration

scholarly journals Erratum: Isotopic (δ 2 H f ) evidence of “loop migration” and use of the Gulf of Maine Flyway by both western and eastern breeding populations of Blackpoll Warblers

2019 ◽  
Vol 90 (3) ◽  
pp. 286-288
Author(s):  
Rebecca L. Holberton ◽  
Steven L. Van Wilgenburg ◽  
Adrienne J. Leppold ◽  
Keith A. Hobson
Keyword(s):  
Gulf Of Maine ◽  
Breeding Populations ◽  
Loop Migration

scholarly journals Autumn migration of soaring birds through the Gebel El Zeit Important Bird Area (IBA), Egypt, threatened by wind farm projects

2011 ◽  
Vol 21 (4) ◽  
pp. 365-375 ◽  
Author(s):  
GUDRUN HILGERLOH ◽  
ANDREAS MICHALIK ◽  
BERND RADDATZ
Keyword(s):  
Wind Farm ◽  
Wind Farms ◽  
White Stork ◽  
East African ◽  
Marsh Harrier ◽  
Circus Pygargus ◽  
Breeding Populations ◽  
Circus Aeruginosus ◽  
Soaring Birds ◽  
Loop Migration

SummarySystematic bird observations were performed during autumn 2006 in the migration bottleneck area of Zeit Bay, Egypt (27.73°N, 33.51°E), situated on the coast of the Gulf of Suez, opposite southern Sinai. Owing to the strong northerly winds in that area, considerable pressure exists to construct wind farms. A total of 145,432 soaring birds, including 134,599 storks and 9,376 raptors over a period of 453.6 hours were observed between 20 August and 29 October by two teams working daily in two shifts. White Stork Ciconia ciconia and European Honey Buzzard Pernis apivorus were the most numerous species (91.4% and 5.7% respectively) of all soaring birds observed. As both species migrate early, relatively few birds were recorded passing through in October. A total of 57,179 soaring birds were observed within a range of 2.5 km from the observers, and of these 32,248 were flying at heights up to 200 m. Few individuals of the rapidly declining breeding populations of Egyptian Vulture Neophron percnotperus (‘Endangered’) and Lesser Kestrel Falco naumanni (‘Vulnerable’) passed (8 and 33 respectively). Pallid Harriers Circus macrourus (‘Near Threatened’) however, were more numerous (100) than at other migration sites along the East African-West Asian Flyway (Israel, southern tip of Sinai, Suez and Bab-el-Mandeb). Western Marsh Harrier Circus aeruginosus and Montagu’s Harrier Circus pygargus were also more numerous than at these sites. Some other large migrant species, observed at Suez, Bab el-Mandeb or in Israel, were seen only in small numbers or not at all at Zeit Bay in autumn. Among them, the Steppe Eagle Aquila nipalensis being the best known example of loop migration, entering Africa at Suez and Bab el-Mandeb, is for this reason not expected in autumn at Zeit Bay, while in spring it is a regular migrant. The number of Black Storks Ciconia nigra observed accounted for 4.8% of the flyway population, that of White Storks for 33.3%, Great White Pelicans Pelecanus onocrotalus for a further 3.5% and European Honey Buzzards for 0.8%. The extrapolation of the number of birds passing through the study area during the migration season, suggests that it was used by 92% of the White Stork, 12% of the Black Stork, 5% of the Great White Pelican, 4% of the European Honey Buzzard and 2% of the Pallid Harrier flyway populations in autumn 2006.

scholarly journals Dramatic intraspecific differences in migratory routes, stopover sites and wintering areas, revealed using light-level geolocators

2012 ◽  
Vol 279 (1747) ◽  
pp. 4582-4589 ◽  
Author(s):  
Kira E. Delmore ◽  
James W. Fox ◽  
Darren E. Irwin
Keyword(s):  
North America ◽  
Light Level ◽  
Conservation Strategies ◽  
Breeding Ecology ◽  
Catharus Ustulatus ◽  
Mitochondrial Haplotypes ◽  
Breeding Populations ◽  
Migratory Routes ◽  
Loop Migration ◽  
Using Data

Migratory divides are contact zones between breeding populations that use divergent migratory routes and have been described in a variety of species. These divides are of major importance to evolution, ecology and conservation but have been identified using limited band recovery data and/or indirect methods. Data from band recoveries and mitochondrial haplotypes suggested that inland and coastal Swainson's thrushes ( Catharus ustulatus ) form a migratory divide in western North America. We attached light-level geolocators to birds at the edges of this contact zone to provide, to our knowledge, the first direct test of a putative divide using data from individual birds over the entire annual cycle. Coastal thrushes migrated along the west coast to Mexico, Guatemala and Honduras. Some of these birds used multiple wintering sites. Inland thrushes migrated across the Rocky Mountains, through central North America to Columbia and Venezuela. These birds migrated longer distances than coastal birds and performed a loop migration, navigating over the Gulf of Mexico in autumn and around this barrier in spring. These findings support the suggestion that divergent migratory behaviour could contribute to reproductive isolation between migrants, advance our understanding of their non-breeding ecology, and are integral to development of detailed conservation strategies for this group.

Predicting bycatch hotspots based on suitable habitat derived from fishery-independent data

2020 ◽  
Vol 641 ◽  
pp. 159-175
Author(s):  
J Runnebaum ◽  
KR Tanaka ◽  
L Guan ◽  
J Cao ◽  
L O’Brien ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Gulf Of Maine ◽  
Homarus Americanus ◽  
Management Tool ◽  
American Lobster ◽  
Suitable Habitat ◽  
Climate Conditions ◽  
Suitability Index

Bycatch remains a global problem in managing sustainable fisheries. A critical aspect of management is understanding the timing and spatial extent of bycatch. Fisheries management often relies on observed bycatch data, which are not always available due to a lack of reporting or observer coverage. Alternatively, analyzing the overlap in suitable habitat for the target and non-target species can provide a spatial management tool to understand where bycatch interactions are likely to occur. Potential bycatch hotspots based on suitable habitat were predicted for cusk Brosme brosme incidentally caught in the Gulf of Maine American lobster Homarus americanus fishery. Data from multiple fisheries-independent surveys were combined in a delta-generalized linear mixed model to generate spatially explicit density estimates for use in an independent habitat suitability index. The habitat suitability indices for American lobster and cusk were then compared to predict potential bycatch hotspot locations. Suitable habitat for American lobster has increased between 1980 and 2013 while suitable habitat for cusk decreased throughout most of the Gulf of Maine, except for Georges Basin and the Great South Channel. The proportion of overlap in suitable habitat varied interannually but decreased slightly in the spring and remained relatively stable in the fall over the time series. As Gulf of Maine temperatures continue to increase, the interactions between American lobster and cusk are predicted to decline as cusk habitat continues to constrict. This framework can contribute to fisheries managers’ understanding of changes in habitat overlap as climate conditions continue to change and alter where bycatch interactions could occur.

Movements and foraging habitats of great shearwaters Puffinus gravis in the Gulf of Maine

2017 ◽  
Vol 574 ◽  
pp. 211-226 ◽  
Author(s):  
KD Powers ◽  
DN Wiley ◽  
AJ Allyn ◽  
LJ Welch ◽  
RA Ronconi
Keyword(s):  
Gulf Of Maine

Evaluation of sugar beet breeding populations based morpho-physiological characters under salinity stress

2018 ◽  
Vol 51 (1) ◽  
Author(s):  
Mehdi Taghizadegan ◽  
Mahmoud Toorchi ◽  
Mohammad Moghadam Vahed ◽  
Samar Khayamim
Keyword(s):  
Sugar Beet ◽  
Salinity Stress ◽  
Breeding Populations ◽  
Physiological Characters

Contaminated sediments database for the Gulf of Maine

2002 ◽  
Author(s):  
Marilyn R. Buchholtz ten Brink ◽  
F.T. Manheim ◽  
E.L. Mecray ◽  
M.E. Hastings ◽  
J.M. Currence ◽  
...  
Keyword(s):  
Gulf Of Maine ◽  
Contaminated Sediments
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