ADAPTATION

Adaptation

A trait that increases fitness of its possessor.

Natural Selection

The process by which certain traits become more or less common in a population due to their impact on survival and reproduction.

Genetic Drift

Random changes in allele frequency due to sampling error.

Non-adaptive variation

Variation in traits that do not confer a selective advantage.

Pleiotropy

One gene affects more than one trait.

Fitness

The ability of an organism to survive and reproduce in its environment.

Trade-offs

Compromises between different traits or investments, such as between reproduction and survival.

Senescence

A late life decline in reproduction and probability of survival.

Principle of Allocation

The concept that resources are limited, leading to trade-offs in survival and reproduction.

Life History Traits

Components of lifetime survival and reproduction, including lifespan, reproductive cycle, and offspring size.

Evolutionary Hypotheses

Theories explaining various biological phenomena, including mutation accumulation and trade-offs.

Mutation Accumulation

The process by which late-acting deleterious mutations accumulate because selection becomes weaker with age.

Fast Life Histories

Characterized by early maturity, short lifespan, and large numbers of offspring.

Slow Life Histories

Characterized by late maturity, long lifespan, and fewer offspring.

Home Range

The area in which an animal usually travels to find food and mates.

Extinction Risk

The likelihood of a species becoming extinct due to factors like reproduction rate and habitat requirements.

Genetic Diversity

The total number of different alleles in a population, impacting adaptability.

Sexual Selection

Selection based on mating success, opposing viability selection.

Anisogamous

Species with two distinct gamete types, typically large eggs and small sperm.

Isogamy

Species with gametes of identical morphology.

Muller's Ratchet

The process by which the least harmful mutations are lost from asexual populations over time.

Red Queen Hypothesis

The idea that species must constantly adapt to survive while competing with other evolving species.

Lottery Model

Suggests offspring disperse into various patches, with different genetic combinations improving survival chances.

Sister Species Comparisons

Comparative analysis involving closely related species to infer evolutionary traits.

Phylogenetically Independent Contrasts (PICs)

A method comparing changes in a causal variable with changes in a dependent variable while controlling for phylogeny.

Comparative Method

A method that tests for adaptation by examining traits across multiple species.

Adaptive Phenotypes

Traits developed through natural selection that enhance survival and reproduction.

Experimental Study

A controlled investigation testing specific hypotheses under controlled conditions.

Observational Study

Research involving natural conditions to gather data without direct manipulation.

Theoretical Study

Use of mathematical models to predict outcomes based on various assumptions.

Physiological Limit

Biological constraints regarding the repair and maintenance capabilities of organisms.

Trade-off Between Reproduction and Repair

The balance between energy spent on reproducing and maintaining bodily systems.

Grandmother Hypothesis

The theory that prolonged childhood allows for improved care of offspring and subsequent reproductive success.

Rate of Living Theory

The idea that organisms with high metabolic rates have shorter lifespans.

Intrinsic Factors

Internal biological elements contributing to mortality and aging.

Extrinsic Factors

External environmental stresses affecting survival and reproduction.

Evolution of Aging

The gradual decline in reproductive success and survival probabilities with age due to weak selection.

Demographic Stochasticity

Random variations in population dynamics that can drastically affect small populations.

Ecosystem Resilience

The capacity of an ecosystem to recover from disturbances.

Sexual Reproduction

Reproduction that involves the combination of genetic material from two parents.

Asexual Reproduction

Reproduction without the fusion of gametes, resulting in genetically identical offspring.

Gametic Strategies

The reproductive approaches organisms use, influenced by their sex and size.

Cost of Sexual Reproduction

The energy and resources expended in finding and competing for mates.

Heterozygosity

The presence of different alleles at a gene locus; can enhance fitness.

Ecological Strategies

The adaptations species develop based on their environmental interactions.

Biological Fitness

The success of an organism in passing its genes to the next generation.

Lifetime Reproductive Success

The total number of offspring an organism produces over its lifetime.

Fitness Components

Factors contributing to overall reproductive success, including survival, mating success, and offspring viability.

Survivorship Curves

Graphical representations showing the number or proportion of individuals surviving at each age.

Population Density

The number of individuals per unit area, affecting competition and resource distribution.

Evolutionary Change

The process through which species undergo modifications over generations.

Resource Allocation

The strategic distribution of available resources to maximize survival or reproduction.

Trait Maintenance

The ongoing effects of natural selection in preserving advantageous traits in a population.

Observed Variation

Differences in traits among individuals in a natural population.

Adaptive Landscapes

Metaphorical landscapes representing fitness peaks and valleys based on trait combinations.

Sustainable Practices

Conservation methods aimed at maintaining ecological balance.

Natural History

The study of organisms, their environments, and their interactions.

Human Impact

The various ways in which human activities affect ecosystems and other species.

Genetic Bottlenecks

Events that drastically reduce population size, leading to decreased genetic diversity.

Speciation Events

The formation of new and distinct species in the course of evolution.

Conservation Strategies

Methods implemented to protect and preserve biodiversity and ecosystems.

Allocation Trade-offs

Decisions regarding resource distribution between competing life processes.

Reproductive Effort

Energy and resources invested in producing and nurturing offspring.

Population Resilience

The ability of a population to withstand environmental changes or disturbances.

Inbreeding Depression

Reduced fitness in a population due to breeding between closely related individuals.

Sexual Dimorphism

Differences in form or size between the sexes of the same species.

Clonal Reproduction

A method of asexual reproduction where offspring are genetically identical to the parent.

Phenotypic Variation

Differences in physical traits within a population due to genetic and environmental influences.

Gaining Competitiveness

Enhancements in an organism's ability to compete for resources in its environment.

Phenotypic Plasticity

The ability of an organism to change its phenotype in response to environmental conditions.

Evolutionary Trade-offs

Balancing different adaptive traits that may not be optimized simultaneously.

Adaptation Evidence

Indicators demonstrating how traits enhance survival and reproduction.

Genetic Variation Sources

Mechanisms generating diversity in gene pools, including mutations and recombination.

Microevolutionary Changes

Small-scale evolutionary changes within populations over time.

Population Genetics

The study of genetic variation and evolutionary processes within populations.

Conservation Biology

The science aimed at understanding and preserving biodiversity.

Biodiversity Hotspots

Regions with a high level of species richness and endemism, often at risk.

Life History Trade-offs

Decisions organisms face between growth, reproduction, and survival.

Ecological Niches

Roles and positions species occupy in ecosystems, influencing interspecies interactions.

Fitness Landscapes

The graphical representation of fitness as a function of genetic variation.

Co-evolutionary Relationships

The reciprocal evolutionary influences between interacting species.

Genetic Recombination

The process of exchanging genetic material during sexual reproduction.

Biotic Interactions

Living factors in an ecosystem affecting species and their environments.

Ecosystem Dynamics

The changes and interactions within ecosystems over time.

Gene Flow

The transfer of genetic material between populations, affecting genetic diversity.

Ecological Disturbances

Disruptions to ecosystems that can influence species survival and community dynamics.

Long-term Evolutionary Trends

Patterns of change in species and ecosystems observed over extended periods.