scholarly journals Perilaku Migrasi Sikep Madu-Asia dalam Pemanfaatan Lanskap di Flores Bagian Timur, Indonesia Berdasarkan Data Satellite-tracking

2020 ◽  
Vol 10 (3) ◽  
pp. 479-488
Author(s):  
Syartinilia ◽  
Risco Noverio Rafael ◽  
Hiroyoshi Higuchi
Keyword(s):  
Food Supply ◽  
Migratory Birds ◽  
Satellite Tracking ◽  
Breeding Habitat ◽  
Migratory Behavior ◽  
Small Islands ◽  
Complex Phenomenon ◽  
Stopover Site ◽  
Wintering Habitat ◽  
Migratory Path

Raptor migration is complex phenomenon of migration which involving of millions of individual birds flying hundreds or thousands kilometers, between breeding habitat and wintering habitat. Migratory behavior consisted of period, route, and other aspects that affect the ecology of migratory birds. Pernis ptylorhynchus, Oriental honey-buzzard (OHB) is one of migratory raptors which have satellite tracked by ARGOS since 2003. Eastern part of Flores Islands consisted of small islands (23 islands) were identified as OHB’s migratory path to reach their wintering habitats in Kupang and Timor Island. This study has aimed to identify and analyze the OHB’s migratory behavior in Eastern part of Flores Islands. Four individuals OHB have satellite tracked in the period of 2007-2012 were used as main data for analyzing their migratory behavior. There was no particular pattern found on the way of OHBs selected islands for their stopover site because of the existence of small islands cluster provide variety of route for each OHBs. The length of their stay found relatively constant every year and tend to be stay longer on larger islands than the smaller one such as Flores Island and Lembata Island. This is apparently due to the larger islands provide more food supply than smaller islands.

scholarly journals Factors influencing fall departure phenology in migratory birds that bred in northeastern North America

The Auk ◽  
2019 ◽  
Author(s):  
Émile Brisson-Curadeau ◽  
Kyle H Elliott ◽  
Pascal Côté
Keyword(s):  
North America ◽  
Short Distance ◽  
Migratory Birds ◽  
Breeding Habitat ◽  
Temperature Changes ◽  
Migration Timing ◽  
Warm Weather ◽  
Breeding Grounds ◽  
Timing Of Migration ◽  
Migrating Birds

Abstract The phenology of migrating birds is shifting with climate change. For instance, short-distance migrants wintering in temperate regions tend to delay their migration in fall during spells of warmer temperature. However, some species do not show strong shifts, and the factors determining which species will react to temperature changes by delaying their migration are poorly known. In addition, it is not known whether a slower migration or a postponed departure creates the observed delays in fall migration because most studies occur far south of the boreal breeding areas making it difficult to separate those 2 mechanisms. We used 22 yr of data at a northern observatory in eastern North America, at the southern edge of the boreal forest, to examine how 21 short-distance migrants responded to changing temperatures. We investigated if those species responding to temperature share life-history features (i.e. diet, size, total migration distance, breeding habitat, timing of migration). The period of migration in each species was, by far, the most important factor predicting the response of a species to temperature. Eight of the 13 species migrating in October changed their migration onset with temperature (usually by delaying migration by 1–2 days/°C), while the migration timing of none of the 8 species migrating in September was dependent on temperature. Furthermore, the absence of a greater migration delay by birds breeding farther from the study site (i.e. Arctic-breeding birds) suggests the mechanism is a postponed departure rather than a slower migration. We conclude that temperature variations in late fall influence the conditions on the breeding grounds, so that birds still present at that time benefit more from postponing their departure in warm weather.

scholarly journals Chemical and structural analysis of a photoactive vertebrate cryptochrome from pigeon

2019 ◽  
Vol 116 (39) ◽  
pp. 19449-19457 ◽  
Author(s):  
Brian D. Zoltowski ◽  
Yogarany Chelliah ◽  
Anushka Wickramaratne ◽  
Lauren Jarocha ◽  
Nischal Karki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Migratory Birds ◽  
Columba Livia ◽  
Migratory Behavior ◽  
High Quantum Yield ◽  
Field Validation ◽  
Low Light ◽  
Light Levels ◽  
Evolutionarily Conserved ◽  
Biochemical Studies

Computational and biochemical studies implicate the blue-light sensor cryptochrome (CRY) as an endogenous light-dependent magnetosensor enabling migratory birds to navigate using the Earth’s magnetic field. Validation of such a mechanism has been hampered by the absence of structures of vertebrate CRYs that have functional photochemistry. Here we present crystal structures of Columba livia (pigeon) CRY4 that reveal evolutionarily conserved modifications to a sequence of Trp residues (Trp-triad) required for CRY photoreduction. In ClCRY4, the Trp-triad chain is extended to include a fourth Trp (W369) and a Tyr (Y319) residue at the protein surface that imparts an unusually high quantum yield of photoreduction. These results are consistent with observations of night migratory behavior in animals at low light levels and could have implications for photochemical pathways allowing magnetosensing.

scholarly journals How hazardous is the Sahara Desert crossing for migratory birds? Indications from satellite tracking of raptors

2009 ◽  
Vol 6 (3) ◽  
pp. 297-300 ◽  
Author(s):  
Roine Strandberg ◽  
Raymond H. G. Klaassen ◽  
Mikael Hake ◽  
Thomas Alerstam
Keyword(s):  
Migratory Birds ◽  
Satellite Telemetry ◽  
Satellite Tracking ◽  
Sahara Desert ◽  
Annual Cycles ◽  
Marsh Harrier ◽  
Circus Aeruginosus ◽  
Course Changes ◽  
Carry Over ◽  
Migrating Birds

We investigated the risk associated with crossing the Sahara Desert for migrating birds by evaluating more than 90 journeys across this desert by four species of raptors (osprey Pandion haliaetus , honey buzzard Pernis apivorus , marsh harrier Circus aeruginosus and Eurasian hobby Falco subbuteo ) recorded by satellite telemetry. Forty per cent of the crossings included events of aberrant behaviours, such as abrupt course changes, slow travel speeds, interruptions, aborted crossings followed by retreats from the desert and failed crossings due to death, indicating difficulties for the migrants. The mortality during the Sahara crossing was 31 per cent per crossing attempt for juveniles (first autumn migration), compared with only 2 per cent for adults (autumn and spring combined). Mortality associated with the Sahara passage made up a substantial fraction (up to about half for juveniles) of the total annual mortality, demonstrating that this passage has a profound influence on survival and fitness of migrants. Aberrant behaviours resulted in late arrival at the breeding grounds and an increased probability of breeding failure (carry-over effects). This study also demonstrates that satellite tracking can be a powerful method to reveal when and where birds are exposed to enhanced risk and mortality during their annual cycles.

scholarly journals Ghrelin affects stopover decisions and food intake in a long-distance migrant

2017 ◽  
Vol 114 (8) ◽  
pp. 1946-1951 ◽  
Author(s):  
Wolfgang Goymann ◽  
Sara Lupi ◽  
Hiroyuki Kaiya ◽  
Massimiliano Cardinale ◽  
Leonida Fusani
Keyword(s):  
Food Intake ◽  
Peptide Hormone ◽  
Migratory Behavior ◽  
Migratory Restlessness ◽  
Long Distance ◽  
Stopover Site ◽  
Blood Concentrations ◽  
Timing Of Migration ◽  
Fat Stores ◽  
Sylvia Borin

Billions of birds migrate long distances to either reach breeding areas or to spend the winter at more benign places. On migration, most passerines frequently stop over to rest and replenish their fuel reserves. To date, we know little regarding how they decide that they are ready to continue their journey. What physiological signals tell a bird’s brain that its fuel reserves are sufficient to resume migration? A network of hormones regulates food intake and body mass in vertebrates, including the recently discovered peptide hormone, ghrelin. Here, we show that ghrelin reflects body condition and influences migratory behavior of wild birds. We measured ghrelin levels of wild garden warblers (Sylvia borin) captured at a stopover site. Further, we manipulated blood concentrations of ghrelin to test its effects on food intake and migratory restlessness. We found that acylated ghrelin concentrations of garden warblers with larger fat scores were higher than those of birds without fat stores. Further, injections of unacylated ghrelin decreased food intake and increased migratory restlessness. These results represent experimental evidence that appetite-regulating hormones control migratory behavior. Our study lays a milestone in migration physiology because it provides the missing link between ecologically dependent factors such as condition and timing of migration. In addition, it offers insights in the regulation of the hormonal system controlling food intake and energy stores in vertebrates, whose disruption causes eating disorders and obesity.

scholarly journals Partial migration and decreasing migration distance in the Hungarian population of the Common Blackbird (Turdus merula Linnaeus, 1758): Analysis of 85 years of ring recovery data

2017 ◽  
Vol 25 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Zoltán Németh
Keyword(s):  
Migratory Birds ◽  
Global Climate ◽  
Population Level ◽  
Climatic Conditions ◽  
Migratory Behavior ◽  
The Past ◽  
Mediterranean Countries ◽  
Hungarian Population ◽  
The Common ◽  
Common Blackbird

Abstract The Common Blackbird is a partial migrant throughout much of its range in Europe. That is, part of its breeding population migrates while the rest stays at the breeding ground for winter. Given the rapidly changing global climate, it is important to understand how migratory birds, including partial migrants, respond to shifting climatic conditions. In this study, I analyzed 85 years of ring recovery data of the Hungarian population of the Blackbird, ringed during the breeding season and recovered during migration or winter, with two objectives in mind: (1) to assess whether the Hungarian Blackbird population is also partially migratory, and (2) to test the prediction that Blackbirds have exhibited decreasing migration distances over the past decades as expected based on warming winter temperatures. Hungarian Blackbirds expressed both migratory and resident strategies, thus can be considered as partial migrants. Furthermore, Blackbirds had been recovered increasingly closer (-5.9 km/year) to their breeding grounds in the past decades. Age and sex had no effects on recovery distance. Provided that this trend continues, the adaptive benefits of migratory behavior may eventually be reduced to a level that selection will not maintain it in the population and the Hungarian population becomes entirely sedentary. Surprisingly, 88% of migrant recoveries were the result of shooting or hunting activities in Mediterranean countries, primarily in Italy, highlighting both the need to understand the effects of hunting pressure on migratory behavior at the population level in songbirds and the urgency to ban the killing of migratory birds in European countries.

scholarly journals Shorebird’s Longer Migratory Distances are Associated with Larger ADCYAP1 Microsatellites and Greater Morphological Complexity of Hippocampal Astrocytes

2021 ◽  
Author(s):  
Diego de Almeida Miranda ◽  
Juliana Araripe Gomes da Silva ◽  
Nara Gyzely de Gyzely Magalhães ◽  
Lucas Silva de Siqueira ◽  
Cintya Castro de Abreu ◽  
...  
Keyword(s):  
Adaptive Response ◽  
Bird Migration ◽  
Migratory Birds ◽  
Migratory Behavior ◽  
Epigenetic Mechanisms ◽  
Long Distance ◽  
Morphological Complexity ◽  
Hippocampal Astrocytes ◽  
Migratory Process ◽  
Multisensory Systems

Abstract Background For the epic journey of autumn migration, long-distance migratory birds use innate and learned information and follow strict schedules imposed by genetic and epigenetic mechanisms, the details of which remain largely unknown. In addition, bird migration requires integrated action of different multisensory systems for learning and memory, and the hippocampus appears to be the integration center for this task. In previous studies we found that contrasting long-distance migratory flights differentially affected the morphological complexity of two types of hippocampus astrocytes. Recently, a significant association was found between the latitude of the reproductive site and the size of the ADCYAP1 allele in long distance migratory birds. Methods We tested for correlations between astrocyte morphological complexity, migratory distances, and size of the ADCYAP1 allele in three long-distance migrant species of shorebird and one non-migrant. Results Significant differences among species were found in the number and morphological complexity of the astrocytes, as well as in the size of the microsatellites of the ADCYAP1 gene. We found significant associations between the size of the ADCYAP1 microsatellites, the migratory distances, and the degree of morphological complexity of the astrocytes. Conclusion We suggest that associations between astrocyte number and morphological complexity, ADCYAP1 microsatellite size, and migratory behavior may be part of the adaptive response to the migratory process of shorebirds.

An Inventory of Flowering Plants of Ameenpur Lake - A Biological Heritage Site, Telangana State

2019 ◽  
Vol 42 (1) ◽  
pp. 59-66
Author(s):  
G. Sailu ◽  
◽  
B. Rama Devi ◽  
K. Chandramohan ◽  
◽  
...  
Keyword(s):  
Plant Species ◽  
Biological Diversity ◽  
Migratory Birds ◽  
Winter Season ◽  
Breeding Habitat ◽  
Flowering Plant ◽  
Floral Resources ◽  
Heritage Site ◽  
Telangana State ◽  
Flowering Plant Species

Ameenpur Lake is located in Medak district of Telangana State. It was recently declared as “Biological heritage” site in state of Telangana under section-37 of the Biological Diversity Act, 2002. This lake is breeding habitat for the migratory birds in the winter season, keeping this in view, it was declared as biological heritage site. The present inventory of floral resources was carried out during the period 2016-18 around the Ameenpur Lake. During the study period an intensive exploration was done and all flowering plant species were documented. The study revealed the occurrence of 180 flowering plant species belonging to 62 families.

scholarly journals Circadian flight schedules in night-migrating birds caught on migration

2008 ◽  
Vol 4 (6) ◽  
pp. 619-622 ◽  
Author(s):  
Timothy Coppack ◽  
Simon F Becker ◽  
Philipp J.J Becker
Keyword(s):  
Migratory Birds ◽  
Activity Patterns ◽  
Stopover Site ◽  
Migratory Activity ◽  
Flight Schedules ◽  
Northern European ◽  
Temporal Cues ◽  
Key Factor ◽  
Migrating Birds ◽  
Songbird Migration

Many species of migratory birds migrate in a series of solitary nocturnal flights. Between flights, they stop to rest and refuel for the next segment of their journey. The mechanism controlling this behaviour has long remained elusive. Here, we show that wild-caught migratory redstarts ( Phoenicurus phoenicurus ) are consistent in their flight scheduling. An advanced videographic system enabled us to determine the precise timing of flight activity in redstarts caught at a northern European stopover site during their return trip from Africa. Birds were held captive for three days in the absence of photoperiodic cues (constant dim light) and under permanent food availability. Despite the absence of external temporal cues, birds showed clear bimodal activity patterns: intense nocturnal activity alternating with diurnal foraging and resting periods. The onset of their migratory activity coincided with the time of local sunset and was individually consistent on consecutive nights. The data demonstrate that night-migrating birds are driven by autonomous circadian clocks entrained by sunset cues. This timekeeping system is probably the key factor in the overall control of nocturnal songbird migration.

Sign in / Sign up

Export Citation Format

Share Document