Distribution and migration phenology of Purple Martins (Progne subis) in Brazil

2021 ◽  
Author(s):  
Clarissa O. Santos ◽  
Jonathan M. Branco ◽  
Maria C. T. D. Belotti ◽  
Pedro Abilleira ◽  
Joe Siegrist ◽  
...  
Keyword(s):  
Progne Subis ◽  
Migration Phenology ◽  
And Migration

Breeding latitude is associated with the timing of nesting and migration around the annual calendar among Purple Martin (Progne subis) populations

2021 ◽  
Author(s):  
L. R. Neufeld ◽  
S. Muthukumarana ◽  
J. D. Fischer ◽  
J. D. Ray ◽  
J. Siegrist ◽  
...  
Keyword(s):  
Progne Subis ◽  
Purple Martin ◽  
And Migration

scholarly journals Patterns of spatial distribution and migration phenology of common pochards Aythya ferina in the Western Palearctic: a ring-recoveries analysis

2018 ◽  
Vol 2018 (1) ◽  
Author(s):  
Benjamin Folliot ◽  
Matthieu Guillemain ◽  
Jocelyn Champagnon ◽  
Alain Caizergues
Keyword(s):  
Spatial Distribution ◽  
Western Palearctic ◽  
Ring Recoveries ◽  
Migration Phenology ◽  
And Migration

Overland movement and migration phenology in relation to breeding of Arctic Terns Sterna paradisaea

Ibis ◽  
2019 ◽  
Vol 162 (2) ◽  
pp. 373-380 ◽  
Author(s):  
Chris P. F. Redfern ◽  
Richard M. Bevan
Keyword(s):  
Sterna Paradisaea ◽  
Migration Phenology ◽  
And Migration

Monitoring landscape-level distribution and migration Phenology of Raptors using a volunteer camera-trap network

2015 ◽  
Vol 39 (3) ◽  
pp. 553-563 ◽  
Author(s):  
David S. Jachowski ◽  
Todd Katzner ◽  
Jane L. Rodrigue ◽  
W. Mark Ford
Keyword(s):  
Camera Trap ◽  
Migration Phenology ◽  
And Migration ◽  
Landscape Level

scholarly journals Evidence for long-term change in length, mass and migration phenology of anadromous spawners in French Atlantic salmonSalmo salar

2017 ◽  
Vol 90 (6) ◽  
pp. 2375-2393 ◽  
Author(s):  
G. Bal ◽  
L. Montorio ◽  
E. Rivot ◽  
E. Prévost ◽  
J.-L. Baglinière ◽  
...  
Keyword(s):  
Term Change ◽  
Migration Phenology ◽  
And Migration

scholarly journals February precipitation in the wintering grounds of the lesser whitethroat, Sylvia curruca : is it a cue for migration onset?

2017 ◽  
Vol 4 (2) ◽  
pp. 160755 ◽  
Author(s):  
Irith Aloni ◽  
Shai Markman ◽  
Yaron Ziv
Keyword(s):  
Regression Models ◽  
Arrival Time ◽  
Weather Conditions ◽  
Negative Effects ◽  
Wintering Grounds ◽  
Migration Patterns ◽  
Habitat Productivity ◽  
Migration Phenology ◽  
Spring Arrival ◽  
And Migration

Numerous studies report shifts in bird migration phenology, presumably owing to global warming. However, most studies focus on migration patterns in the Northern Hemisphere. In this study, we investigated associations between weather conditions in African wintering grounds of the lesser whitethroat, Sylvia curruca, and spring arrival time in Eilat, Israel. Using multivariate regression models, we analysed a 30-year dataset in order to examine correlations between median springtime arrival and 46 climate variables of the wintering quarters. The model obtained exhibited a highly statistical fit, involving mean precipitation in February and March with negative effects and number of wet days during November–February. February precipitation levels were also the major factor associated with the interquartile range of arrival time. Interestingly and contrary to published results, annual or seasonal precipitation showed no correlation with spring arrival time, nor did temperature. Moreover, winter in this region falls into dry season with negligible rainfall quantities. Hence, it is unlikely that precipitation effect on habitat productivity is a driving force of migration, as suggested by other studies. Instead, we propose that precipitation in February acts as a cue for the birds, indicating the approach of spring and migration time.

scholarly journals Mullet fry (Mugilidae) in coastal waters of Montenegro, their spatial distribution and migration phenology

2010 ◽  
Vol 62 (1) ◽  
pp. 107-114 ◽  
Author(s):  
B. Mickovic ◽  
M. Nikcevic ◽  
A. Hegedis ◽  
S. Regner ◽  
Z. Gacic ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Coastal Waters ◽  
Coastal Areas ◽  
Mugil Cephalus ◽  
The Third ◽  
Migration Phenology ◽  
And Migration ◽  
Chelon Labrosus

Three localities, representing three distinct coastal areas, were investigated: 1. the mouth of the Sutorina River; 2. the mouth of the Jaska River; 3. the mouth of the Bojana River (right branch). Regarding the composition of young mullet assemblages, Lisa saliens, Lisa ramada and Lisa aurata were dominant at the first locality; L. aurata and Chelon labrosus at the second; and at the third L. ramada was clearly dominant, Mugil cephalus occupied the subdominant position, while L. aurata was absent. The seasons of the first appearance of migratory fry were October, April, November, October and July, for M. cephalus, C. labrosus, L. ramada, L. aurata and L. saliens, respectively. Migratory periods varied from 2 (C. labrosus) to 7 (L. ramada) months.

scholarly journals Geographic origin and migration phenology of European red admirals (Vanessa atalanta) as revealed by stable isotopes

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Oskar Brattström ◽  
Anatoly Shapoval ◽  
Leonard I. Wassenaar ◽  
Keith A. Hobson ◽  
Susanne Åkesson
Keyword(s):  
Stable Isotopes ◽  
Geographic Origin ◽  
Migration Phenology ◽  
And Migration ◽  
Vanessa Atalanta

Demonstration of Retinal Glycogen with Silver Methenamine

1971 ◽  
Vol 29 ◽  
pp. 564-565
Author(s):  
A. W. Sedar ◽  
G. H. Bresnick
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Periodic Acid ◽  
Müller Cell ◽  
External Limiting Membrane ◽  
Electron Microscope Level ◽  
Reactive Process ◽  
Inner Limiting Membrane ◽  
Muller Cell ◽  
And Migration

After experimetnal damage to the retina with a variety of procedures Müller cell hypertrophy and migration occurs. According to Kuwabara and others the reactive process in these injuries is evidenced by a marked increase in amount of glycogen in the Müller cells. These cells were considered originally supporting elements with fiber processes extending throughout the retina from inner limiting membrane to external limiting membrane, but are known now to have high lactic acid dehydrogenase activity and the ability to synthesize glycogen. Since the periodic acid-chromic acid-silver methenamine technique was shown to demonstrate glycogen at the electron microscope level, it was selected to react with glycogen in the fine processes of the Müller cell that ramify among the neural elements in various layers of the retina and demarcate these cells cytologically. The Rhesus monkey was chosen as an example of a well vascularized retina and the rabbit as an example of a avascular retina to explore the possibilities of the technique.

Structure and migration of planar defects in crystals observed in atomic scale

1978 ◽  
Vol 36 (1) ◽  
pp. 284-285 ◽  
Author(s):  
H. Hashimoto ◽  
Y. Sugimoto ◽  
Y. Takai ◽  
H. Endoh
Keyword(s):  
Electron Microscope ◽  
Rotation Angle ◽  
Crystal Surface ◽  
Electron Gun ◽  
Atomic Scale ◽  
Present Observation ◽  
Twist Boundary ◽  
Optical Magnification ◽  
Zinc Crystal ◽  
And Migration

As was demonstrated by the present authors that atomic structure of simple crystal can be photographed by the conventional 100 kV electron microscope adjusted at “aberration free focus (AFF)” condition. In order to operate the microscope at AFF condition effectively, highly stabilized electron beams with small energy spread and small beam divergence are necessary. In the present observation, a 120 kV electron microscope with LaB6 electron gun was used. The most of the images were taken with the direct electron optical magnification of 1.3 million times and then magnified photographically.1. Twist boundary of ZnSFig. 1 is the image of wurtzite single crystal with twist boundary grown on the surface of zinc crystal by the reaction of sulphur vapour of 1540 Torr at 500°C. Crystal surface is parallel to (00.1) plane and electron beam is incident along the axis normal to the crystal surface. In the twist boundary there is a dislocation net work between two perfect crystals with a certain rotation angle.

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