GATE Examinations Courses Syllabus

Syllabus

Fundamental Concepts section_1_1

Syllabus
Fundamental Concepts: Abiotic and biotic components; scales (population, species, community, ecosystems, biomes); niches and habitats.
Core concepts (5)
  • Abiotic components
  • Biotic components
  • Levels (scales) of ecological organization
  • Ecological niche
  • Habitat
Related concepts (8)
  • Species concept (ecological relevance)
  • Population attributes
  • Community interactions
  • Ecosystem processes
  • Biome classification
  • Niche partitioning and coexistence
  • Fundamental vs realized niche
  • Habitat selection and habitat suitability

Population Ecology section_1_2

Syllabus
Population Ecology: Population growth rates (density dependent/independent); meta population ecology (colonization, persistence, extinction, patches, sources, sinks); age-structured populations
Core concepts (8)
  • Population growth rate
  • Density-independent regulation
  • Density-dependent regulation
  • Metapopulation
  • Colonization and extinction dynamics
  • Patch structure
  • Source-sink dynamics
  • Age-structured populations
Related concepts (9)
  • Exponential growth model
  • Logistic growth and carrying capacity
  • Allee effects
  • Demographic vs environmental stochasticity
  • Dispersal and connectivity
  • Rescue effect
  • Life tables
  • Leslie matrix model
  • Reproductive value

Interactions section_1_3

Syllabus
Interactions: Types (mutualism, symbiosis, commensalism, competition, parasitism, predation, etc); ecophysiology (physiological adaptations to abiotic environment); prey-predator interactions (Lotka-Volterra equation, etc.)
Core concepts (10)
  • Species interactions (interaction types)
  • Mutualism
  • Symbiosis
  • Commensalism
  • Competition
  • Parasitism
  • Predation
  • Ecophysiology
  • Physiological adaptation to abiotic environment
  • Lotka-Volterra predator-prey model
Related concepts (10)
  • Interaction outcomes and context dependence
  • Functional response (Holling types)
  • Numerical response
  • Apparent competition
  • Keystone predation and trophic cascades
  • Competitive exclusion and coexistence
  • Character displacement
  • Thermal performance curves and Q10
  • Osmoregulation and water balance
  • Acclimation vs adaptation

Community Ecology section_1_4

Syllabus
Community Ecology: Community assembly, organization and succession; species richness, evenness and diversity indices, species-area relationships; theory of island biogeography
Core concepts (8)
  • Community assembly
  • Community organization
  • Ecological succession
  • Species richness
  • Evenness
  • Diversity indices
  • Species-area relationship (SAR)
  • Theory of island biogeography
Related concepts (10)
  • Environmental filtering
  • Dispersal limitation
  • Priority effects
  • Facilitation, tolerance, and inhibition models of succession
  • Intermediate disturbance hypothesis
  • Alpha, beta, gamma diversity
  • Rarefaction and sampling effort
  • Rank-abundance curves
  • Nestedness and turnover in island/fragment communities
  • Habitat fragmentation as 'islands'

Ecosystems Structure and Function section_1_5

Syllabus
Ecosystems Structure and Function: Trophic levels and their interactions; nutrient cycles; primary and secondary productivity
Core concepts (7)
  • Ecosystem structure
  • Trophic levels
  • Food chains and food webs
  • Trophic interactions
  • Nutrient cycles (biogeochemical cycles)
  • Primary productivity
  • Secondary productivity
Related concepts (9)
  • Energy flow vs nutrient cycling
  • Ecological efficiency and trophic transfer efficiency
  • Detrital pathway and decomposition
  • Stoichiometry and nutrient limitation
  • Mineralization and immobilization
  • Nitrogen transformations
  • Phosphorus cycle characteristics
  • Bottom-up vs top-down control
  • Standing crop and turnover

History of Evolutionary Thought section_2_1

Syllabus
History of Evolutionary Thought: Lamarckism; Darwinism; Modern Synthesis
Core concepts (4)
  • Lamarckism
  • Darwinism
  • Modern Synthesis (Neo-Darwinism)
  • Comparative analysis of evolutionary theories
Related concepts (9)
  • Mendelian genetics
  • Weismann barrier and germplasm theory
  • Population genetics basics
  • Variation and mutation
  • Adaptation and fitness
  • Selection types
  • Genetic drift and gene flow
  • Speciation overview
  • Evidence for evolution (historical context)

Fundamentals section_2_2

Syllabus
Fundamentals: Variation; heritability; natural selection; fitness and adaptation; types of selection (stabilizing, directional, disruptive)
Core concepts (6)
  • Variation
  • Heritability
  • Natural selection
  • Fitness
  • Adaptation
  • Types of selection
Related concepts (8)
  • Genotype–phenotype map
  • Phenotypic plasticity
  • Sources of genetic variation
  • Quantitative genetics
  • Hardy–Weinberg baseline
  • Trade-offs and constraints
  • Selection coefficients and selection gradients
  • Inclusive fitness (high-level)

Diversity of Life section_2_3

Syllabus
Fundamentals: Diversity of Life: Origin and history of life on earth; diversity and classification of life; systems of classification (cladistics and phenetics)
Core concepts (7)
  • Origin of life (abiogenesis) — overview
  • Early evolution and history of life on Earth
  • Diversity of life
  • Classification and taxonomy
  • Cladistics (phylogenetic systematics)
  • Phenetics (numerical taxonomy)
  • Comparing classification systems
Related concepts (10)
  • Geological time scale
  • Endosymbiotic theory
  • Great Oxidation Event and oxygenation
  • Fossil record and dating
  • Molecular phylogenetics (overview)
  • Homology vs analogy
  • Character states and polarity
  • Tree thinking
  • Species concepts (overview)
  • Horizontal gene transfer (HGT)

Life History Strategies section_2_4

Syllabus
Life History Strategies: Allocation of resources; tradeoffs; r/K selection; semelparity and iteroparity
Core concepts (7)
  • Life-history strategies (framework)
  • Resource allocation
  • Trade-offs
  • r/K selection (classic heuristic)
  • Semelparity
  • Iteroparity
  • Comparing parity modes
Related concepts (9)
  • Fitness components and reproductive value
  • Cost of reproduction
  • Age at first reproduction
  • Offspring size–number trade-off
  • Bet-hedging (overview)
  • Density dependence
  • Environmental stochasticity
  • Phenotypic plasticity in life histories
  • Survivorship curves

Interactions section_2_5

Syllabus
Interactions: Co-evolution (co-adaptations, arms race, Red Queen hypothesis, cospeciation); prey-predator interactions (mimicry, crypsis, etc)
Core concepts (8)
  • Coevolution
  • Co-adaptations
  • Evolutionary arms race
  • Red Queen hypothesis
  • Cospeciation
  • Predator–prey interactions (evolutionary outcomes)
  • Crypsis (camouflage)
  • Mimicry
Related concepts (9)
  • Host–parasite coevolution
  • Geographic mosaic theory of coevolution
  • Frequency-dependent selection
  • Aposematism
  • Behavioral ecology of predation
  • Sensory ecology
  • Phylogenetic congruence tests (overview)
  • Constraints and trade-offs in defenses
  • Community context

Population and Quantitative Genetics section_2_6

Syllabus
Population and Quantitative Genetics: Origins of genetic variation; Mendelian genetics; Hardy- Weinberg equilibrium; drift; selection (one-locus two-alleles model); population genetic structure (panmixia, gene flow, FST); polygenic traits; gene-environment interactions (phenotypic plasticity); heritability
Core concepts (13)
  • Origins of genetic variation
  • Mendelian genetics (population context)
  • Hardy–Weinberg equilibrium (HWE)
  • Genetic drift
  • Selection in a one-locus two-allele model
  • Panmixia
  • Gene flow (migration)
  • Population genetic structure
  • Fixation index \(F_{ST}\)
  • Polygenic (quantitative) traits
  • Gene–environment interaction (G×E)
  • Phenotypic plasticity
  • Heritability (quantitative genetics)
Related concepts (10)
  • Allele and genotype frequencies
  • Effective population size \(N_e\)
  • Inbreeding and assortative mating
  • Mutation–selection balance (overview)
  • Bottleneck and founder effects
  • Linkage disequilibrium (LD) (overview)
  • Additive, dominance, and epistatic variance
  • Breeder’s equation
  • Common garden and reciprocal transplant
  • Reaction norms

Molecular Evolution and Phylogenetics section_2_7

Syllabus
Molecular Evolution and Phylogenetics: Neutral theory; molecular clocks; rates of evolution; phylogenetic reconstruction; molecular systematics
Core concepts (6)
  • Neutral theory of molecular evolution
  • Nearly neutral theory (exam-relevant extension)
  • Molecular clocks
  • Rates of evolution
  • Phylogenetic reconstruction
  • Molecular systematics
Related concepts (14)
  • Genetic drift and fixation
  • Effective population size \(N_e\)
  • Synonymous vs nonsynonymous substitutions
  • Purifying selection and constraint
  • Positive selection (molecular signatures)
  • Multiple sequence alignment (MSA)
  • Models of sequence evolution
  • Distance methods
  • Parsimony, maximum likelihood, Bayesian inference
  • Support and uncertainty
  • Rooting and outgroups
  • Gene trees vs species trees
  • Orthology vs paralogy
  • Long-branch attraction (LBA)

Macroevolution section_2_8

Syllabus
Macroevolution: Species concepts and speciation; adaptive radiation; convergence; biogeography
Core concepts (7)
  • Macroevolution (scope and patterns)
  • Species concepts
  • Speciation
  • Reproductive isolation
  • Adaptive radiation
  • Convergent evolution
  • Biogeography
Related concepts (14)
  • Allopatric speciation
  • Peripatric speciation
  • Parapatric speciation
  • Sympatric speciation
  • Hybrid zones and reinforcement
  • Ecological speciation
  • Sexual selection in speciation
  • Dobzhansky–Muller incompatibilities (DMI)
  • Polyploid speciation
  • Key innovations
  • Character displacement
  • Homology vs convergence in phylogenies
  • Vicariance vs dispersal
  • Island biogeography link (overview)

Mathematics and Statistics in Ecology section_3_1

Syllabus
Mathematics and Statistics in Ecology: Simple functions (linear, quadratic, exponential, logarithmic, etc); concept of derivatives and slope of a function; permutations and combinations; basic probability (probability of random events; sequences of events, etc); frequency distributions and their descriptive statistics (mean, variance, coefficient of variation, correlation, etc).
Core concepts (5)
  • Simple functions used in ecology
  • Derivatives and slope
  • Permutations and combinations
  • Basic probability
  • Frequency distributions and descriptive statistics
Related concepts (5)
  • Transformations and linearization
  • Units, scaling, and dimensional reasoning
  • Sampling concepts
  • Graphical summaries
  • Covariance vs correlation

Statistical Hypothesis Testing section_3_2

Syllabus
Statistical Hypothesis Testing: Concept of p-value; Type I and Type II error, test statistics like t- test and Chi-square test; basics of linear regression and ANOVA.
Core concepts (7)
  • Statistical hypotheses and p-values
  • Type I and Type II errors
  • Test statistics and sampling distributions (working level)
  • t-tests
  • Chi-square tests
  • Linear regression (basics)
  • ANOVA (basics)
Related concepts (5)
  • Assumptions and diagnostics
  • Confidence intervals vs hypothesis tests
  • Effect size and practical significance
  • Multiple comparisons (awareness level)
  • Categorical vs continuous responses

Classical Ethology section_4_1

Syllabus
Behavioural Ecology (4.1): Classical Ethology—Instinct; fixed action patterns; imprinting; learnt behavior; proximate and ultimate questions.
Core concepts (5)
  • Instinct
  • Fixed action patterns (FAPs)
  • Imprinting
  • Learned behavior
  • Proximate vs ultimate questions
Related concepts (9)
  • Sign stimuli (releasers)
  • Innate releasing mechanism (IRM)
  • Sensitive/critical periods
  • Habituation and sensitization
  • Classical vs operant conditioning
  • Nature–nurture and reaction norms
  • Ethogram and behavioral measurement
  • Comparative method in ethology
  • Tinbergen’s four questions

Sensory Ecology section_4_2

Syllabus
Behavioural Ecology (4.2): Sensory Ecology—Neuroethology; communication (chemical, acoustic and visual signaling); recognition systems.
Core concepts (7)
  • Sensory ecology
  • Neuroethology
  • Animal communication
  • Chemical signaling
  • Acoustic signaling
  • Visual signaling
  • Recognition systems
Related concepts (10)
  • Signal vs cue
  • Sender–receiver coevolution
  • Honest signaling and signal reliability
  • Environmental transmission channels
  • Noise and masking
  • Receiver psychology
  • Multimodal signaling
  • Self/non-self and kin recognition
  • Species recognition and reproductive isolation
  • Sensory drive hypothesis

Foraging Ecology section_4_3

Syllabus
Behavioural Ecology (4.3): Foraging Ecology—Foraging behaviour; optimal foraging theory.
Core concepts (6)
  • Foraging behaviour
  • Optimal foraging theory (OFT)
  • Energy/time budgets
  • Prey choice (diet breadth) model
  • Patch use and patch leaving
  • Marginal Value Theorem (MVT)
Related concepts (9)
  • Fitness currencies
  • Constraints and trade-offs
  • Information and uncertainty
  • Risk-sensitive foraging
  • Central place foraging
  • Functional responses
  • Giving-up density (GUD)
  • Interference and exploitation competition
  • State-dependent foraging

Reproduction section_4_4

Syllabus
Behavioural Ecology (4.4): Reproduction—Cost of sex; sexual dimorphism; mate choice; sexual selection (runaway selection, good-genes, handicap principle, etc.); sexual conflict; mating systems; parental care.
Core concepts (10)
  • Cost of sex
  • Sexual dimorphism
  • Mate choice
  • Sexual selection
  • Runaway (Fisherian) selection
  • Good-genes sexual selection
  • Handicap principle
  • Sexual conflict
  • Mating systems
  • Parental care
Related concepts (10)
  • Anisogamy and Bateman’s principle
  • Operational sex ratio (OSR)
  • Parental investment theory (Trivers)
  • Sperm competition and cryptic female choice
  • Alternative reproductive tactics
  • Sex role reversal
  • Fecundity selection
  • Life-history trade-offs
  • Inclusive fitness and kin selection in care
  • Parent–offspring conflict

Social Living section_4_5

Syllabus
Behavioural Ecology (4.5): Social Living—Costs and benefits of group-living (including responses to predators); effect of competition (scramble and contest) on group formation; dominance relationships; eusociality; kin selection; altruism; reciprocity; human behaviour.
Core concepts (12)
  • Group living (social living)
  • Costs and benefits of group living
  • Anti-predator benefits of groups
  • Competition and group formation
  • Scramble competition
  • Contest competition
  • Dominance relationships
  • Kin selection
  • Altruism
  • Reciprocity
  • Eusociality
  • Human behaviour (behavioral ecology perspective)
Related concepts (13)
  • Hamilton’s rule
  • Inclusive fitness
  • Direct vs indirect fitness
  • Mutualism
  • Reciprocal altruism (Trivers)
  • By-product benefits
  • Cheater problem
  • Kin recognition and discrimination
  • Policing and punishment
  • Game theory in social behavior
  • Group selection and multilevel selection
  • Life-history and ecological constraints on eusociality
  • Gene–culture coevolution

Biodiversity and Conservation section_5_1

Syllabus
Biodiversity and Conservation: Importance of conserving biodiversity; ecosystem services; threats to biodiversity; invasive species; in-situ conservation (endemism, biodiversity hotspots, protected areas); ex-situ conservation; conservation genetics (genetic diversity, inbreeding depression); DNA fingerprinting and DNA barcoding.
Core concepts (8)
  • Biodiversity: levels and value
  • Ecosystem services
  • Threats to biodiversity
  • Invasive alien species
  • In-situ conservation
  • Ex-situ conservation
  • Conservation genetics
  • DNA fingerprinting and DNA barcoding
Related concepts (6)
  • Species concepts and taxonomy basics
  • Population viability analysis (PVA)
  • Metapopulations and fragmentation
  • IUCN categories and conservation prioritization
  • Conservation policy instruments
  • Molecular markers overview

Disease Ecology and Evolution section_5_2

Syllabus
Disease Ecology and Evolution: Epidemiology; zoonotic diseases; antibiotic resistance; vector Control Plant and animal breeding: Marker assisted breeding; genetic basis of economically important traits.
Core concepts (8)
  • Epidemiology fundamentals
  • Disease transmission models
  • Zoonotic diseases
  • Evolution of virulence and pathogen life-history
  • Antibiotic resistance evolution
  • Vector ecology and vector control
  • Genetic basis of economically important traits
  • Marker-assisted breeding
Related concepts (8)
  • Surveillance and study designs
  • Diagnostics and test performance
  • Phylogenetics and phylodynamics
  • One Health framework
  • Integrated vector management (IVM)
  • Quantitative genetics in breeding programs
  • Genomic selection (contrast to MAS)
  • Ethics and biosafety in breeding and control

Global Climate Change section_5_3

Syllabus
Global Climate Change: Causes; consequences; mitigation
Core concepts (10)
  • Earth’s climate system basics
  • Causes of modern climate change
  • Carbon cycle and major greenhouse gases
  • Climate variability vs climate change
  • Consequences for physical systems
  • Consequences for ecosystems and biodiversity
  • Consequences for society and health
  • Mitigation: emission reduction
  • Mitigation: carbon dioxide removal (CDR)
  • Adaptation and resilience (bridge to mitigation)
Related concepts (8)
  • IPCC framing and scenarios
  • Climate feedbacks and tipping elements
  • Ocean–atmosphere coupling
  • Ecophysiology under climate stress
  • Conservation under climate change
  • Policy instruments
  • Life cycle assessment (LCA)
  • Geoengineering overview