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Related Concept Videos

Migration00:53

Migration

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.
Osmoregulation in Fishes02:32

Osmoregulation in Fishes

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?
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Fixed Action Patterns01:06

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Decision Making01:20

Decision Making

Decision-making is a fundamental cognitive process that involves evaluating alternatives and selecting among them. This process can range from simple choices, such as deciding what to wear, to complex decisions, like choosing a major in college or a career path. The complexity of the decision often dictates the approach we use, which can be broadly categorized into two types: automatic and controlled decision-making.
Automatic decision-making is fast, intuitive, and relies on gut feelings...

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Related Experiment Video

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Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions
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Condition-dependent individual decision-making determines cyprinid partial migration.

Jakob Brodersen1, P Anders Nilsson, Lars-Anders Hansson

  • 1Department of Ecology/Limnology, Lund University, SE-223 62 Lund, Sweden. jakob.brodersen@limnol.lu.se

Ecology
|June 12, 2008
PubMed
Summary
This summary is machine-generated.

Food availability influences partial migration in fish. Fish with better access to food migrate more, stay longer, and have lower mortality, showing condition-dependent migration strategies.

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Area of Science:

  • Ecology
  • Animal Behavior
  • Ichthyology

Background:

  • Partial migration is a widespread phenomenon in diverse ecosystems.
  • Understanding its mechanisms is crucial for population dynamics and ecosystem processes.

Purpose of the Study:

  • To investigate the impact of food availability on seasonal partial migration in cyprinid fish.
  • To elucidate the role of individual condition in migration decisions.

Main Methods:

  • Utilized passive telemetry to track fish movements between a lake and connected streams during winter.
  • Assessed the relationship between food access and migration timing, duration, and return rates.

Main Results:

  • Increased food availability led to a higher proportion of fish migrating earlier and for longer periods.
  • Fewer unfed migrants returned to the lake, suggesting elevated overwinter mortality.
  • Migration patterns were condition-dependent, with individual fish balancing predation risk and food access.

Conclusions:

  • Individual decision-making, based on self-assessed body condition, provides a mechanistic explanation for partial migration.
  • Condition-dependent partial migration influences population responses to environmental changes.
  • This phenomenon is significant for ecosystem dynamics and stability.