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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Latitudes and departures are essential concepts in surveying, providing a systematic way to analyze the projections of traverse lines. These projections allow surveyors to interpret a line's north-south and east-west components, which are crucial for precisely calculating areas, bearings, and lengths. Latitude is the north-south projection of a line, calculated as the product of the line's length and the cosine of its bearing. Departure, conversely, is the east-west projection obtained by...
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Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Using Generative Art to Convey Past and Future Climate Transitions
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Avian migration clocks in a changing world.

Barbara Helm1, Miriam Liedvogel2

  • 1Swiss Ornithological Institute, Bird Migration Unit, Seerose 1, CH-6204, Sempach, Schweiz. barbara.helm@vogelwarte.ch.

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
|February 2, 2024
PubMed
Summary
This summary is machine-generated.

Avian migration relies on complex internal timing programs. Understanding how these programs interact with environmental changes is crucial for bird conservation amid rapid global shifts.

Keywords:
CircadianCircannualClimate changeMigration programmeMigratory restlessnessNavigation

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Area of Science:

  • Chronobiology
  • Animal Behavior
  • Ecology

Background:

  • Long-distance avian migration is a complex annual behavior requiring precise timing and navigation.
  • Migration timing anticipates future environmental conditions, making it a key area of chronobiology research.
  • Previous studies relied on captive bird behavior (migratory restlessness) to understand internal timing mechanisms.

Purpose of the Study:

  • To integrate mechanistic understanding of avian migration timing with real-world behaviors observed in free-flying birds.
  • To investigate how migration programs interact with environmental cues and anthropogenic changes.
  • To explore the physiological and genetic underpinnings of migratory adaptations.

Main Methods:

  • Utilizing advanced tracking technologies to collect annual-cycle data from free-flying birds.
  • Analyzing actograms to correlate internal timing with migratory behavior.
  • Employing genomic approaches to study physiological pathways involved in migration.

Main Results:

  • Tracking data now allows linking captive-derived mechanistic insights (circannual/circadian rhythms, direction sense) to wild bird migration.
  • Genomic studies are beginning to reveal the physiological basis of migratory behaviors.
  • The integration of migration programs with specific environmental conditions remains an open question.

Conclusions:

  • Migratory birds face challenges adapting to rapidly changing environments, with varying species-specific responses.
  • Further integrated research is essential to understand migratory timing programs and their responses to environmental modification.
  • Interdisciplinary collaboration is key to addressing the complex challenges facing migratory bird populations globally.