Related Experiment Video
Updated: Apr 14, 2026
13:38
Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
8.6K
Dynamic Lake Ice Conditions Shape Caribou Water-Crossing Behavior in the Arctic
Qianru Liao1, Eliezer Gurarie2, William F Fagan1
1Department of Biology, University of Maryland, College Park, Maryland, USA.
Global Change Biology
|April 13, 2026
Summary
Caribou migration is affected by changing lake ice conditions. Spring crossings depend on ice stability, while fall movements are influenced by route efficiency, impacting Arctic wildlife connectivity.
Area of Science:
- Ecology
- Animal Behavior
- Climate Change Science
Background:
- Animal migration relies on navigation and decision-making in changing environments.
- Understanding responses to transient barriers like seasonal ice is crucial for predicting migration under global change.
- Arctic warming alters ice cover, impacting overland migrants like barren-ground caribou (Rangifer tarandus).
Purpose of the Study:
- To quantitatively assess caribou behavioral responses to changing lake ice conditions.
- To analyze lake-crossing decisions in relation to ice conditions and movement factors.
- To develop a framework for predicting climate-driven shifts in migratory behavior.
Main Methods:
- Analyzed 20 years of GPS data from 406 caribou and daily MODIS land surface albedo data.
- Classified transit events (crossing vs. circumnavigation) based on GPS trajectories.
- Linked behavioral decisions to spatially and temporally resolved ice conditions using statistical models.
Main Results:
- Spring crossing decisions were influenced by intermediate ice conditions, with a threshold identified at a specific albedo percentile rank.
- Fall behavior was better explained by movement-related factors like relative speeds along alternative routes when the lake was ice-free.
- Ice acts as a seasonal filter, shaping functional connectivity through perceptual and energetic constraints.
Conclusions:
- Caribou exhibit distinct seasonal strategies for navigating lake ice, influenced by ice stability in spring and route efficiency in fall.
- The study provides a transferable framework for linking remote sensing to individual behavior to identify thresholds in response to dynamic landscape features.
- This approach supports predictive monitoring of climate-driven changes in migratory behavior and movement constraints.
Related Concept Videos
01:24Freshwater Microbial Ecology
45
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
45
00:53Migration
9.1K
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.
9.1K
01:23States of Water
58.4K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
58.4K
01:32What is Natural Selection?
133.2K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
133.2K
01:05Instinctive Drift
1.3K
Instinctive drift refers to the tendency of animals to revert to their innate behaviors despite repeated reinforcement. Breland and Breland demonstrated this concept in an experiment with a raccoon. The raccoon was trained to pick up two coins and place them in a container in exchange for food. Initially, the raccoon learned to associate the coins with food, making them a conditioned stimulus or a substitute for food. However, over time, the raccoon became less willing to put the coins into the...
1.3K
02:32Osmoregulation in Fishes
55.4K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
55.4K