Conservation Genetics Calculators

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Conservation genetics applies genetic principles and molecular techniques to protect biodiversity and manage threatened species. Core concerns include: genetic diversity loss through genetic drift and inbreeding in small populations; inbreeding depression (reduced fitness in inbred individuals); minimum viable population (MVP) size; effective population size (Ne); and genetic rescue (introducing new genetic variation to reverse inbreeding depression). Molecular tools (microsatellites, SNP arrays, whole-genome sequencing) reveal population structure, gene flow, hybridization, and adaptive genetic variation critical for evidence-based conservation management.

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Inbreeding Depression

Inbreeding (mating between relatives) increases homozygosity, exposing deleterious recessive alleles that were masked in heterozygotes. Inbreeding coefficient F measures the probability that both alleles at a locus are identical by descent. Effects: reduced survival, fertility, immune function, and stress tolerance. Florida panther Ne < 20 caused severe inbreeding depression — translocations from Texas panthers (genetic rescue) dramatically improved survival and reproductive success.

Effective Population Size (Ne)

Ne is the size of an ideal population experiencing the same rate of genetic drift as the actual population. Ne << N due to unequal sex ratios, variance in reproductive success, and bottlenecks. Genetic diversity lost per generation ≈ 1/(2Ne). The 50/500 rule: Ne ≥ 50 to limit inbreeding; Ne ≥ 500 for long-term evolutionary potential.

Genetic Rescue

Genetic rescue introduces individuals from genetically distinct populations to increase heterozygosity and alleviate inbreeding depression. Successful examples: Florida panther, Isle Royale wolves, greater prairie chicken, Swedish adder populations. Risk: outbreeding depression (loss of local adaptations) is rare but possible — evaluate before translocations.

Molecular Tools

  • Microsatellites: measure heterozygosity, FST, kinship, relatedness
  • SNP arrays/RADseq: population structure, admixture, adaptive variation
  • Environmental DNA (eDNA): non-invasive species detection from water/soil samples
  • Genome sequencing: identify deleterious recessive alleles, adaptive genes

Glossary

Inbreeding Depression
Reduced fitness of offspring from closely related parents; caused by increased homozygosity exposing deleterious recessive alleles; threatens small isolated populations with extinction.
Genetic Rescue
Introduction of individuals from a different population to increase genetic diversity and reduce inbreeding depression; successful in Florida panther, Isle Royale wolves, and other cases.
eDNA (Environmental DNA)
Genetic material shed by organisms into the environment; detected from water or soil by qPCR or metabarcoding; used for non-invasive species detection and biodiversity monitoring.

Frequently Asked Questions

Inbreeding depression is the reduced fitness of offspring from closely related parents. As populations become small, random mating increasingly involves relatives — raising the inbreeding coefficient F (probability of both alleles being identical by descent). High homozygosity exposes harmful recessive alleles previously masked by functional dominant alleles. Effects include: lower survival rates, reduced fertility, impaired immune function, and developmental abnormalities. Inbreeding depression can be severe enough to drive small populations to extinction — the extinction vortex where small size → inbreeding → lower fitness → smaller size → more inbreeding.

Genetic rescue is the introduction of individuals from another population to increase genetic diversity and reduce inbreeding depression in a small, isolated population. It works by: providing new alleles that restore heterozygosity; diluting deleterious alleles that have fixed by drift; and restoring hybrid vigor. Classic example: Florida panther (Puma concolor coryi) population dropped to ~25 individuals with severe inbreeding depression (kinked tails, low sperm quality, atrial septal defects). Translocation of 8 Texas pumas in 1995 dramatically improved survival, reproduction, and population size. Genetic rescue is used when populations are severely inbred and isolated.

MVP is the smallest population size with a defined probability (typically 95–99%) of persistence over a specified time (usually 100 years). Below MVP, demographic stochasticity, inbreeding depression, loss of genetic diversity, and catastrophic events make extinction likely. MVP is population-specific — determined by population viability analysis (PVA) that simulates birth, death, and catastrophic events stochastically. General rule: Ne ≥ 50 to limit inbreeding depression; Ne ≥ 500 for long-term evolutionary potential. Census population N is usually 5–10× Ne, so MVP census populations are often 250–5000 individuals.

Environmental DNA (eDNA) is genetic material shed by organisms into their environment (water, soil, air) — skin cells, feces, mucus, eggs. It can be collected from water samples and detected by species-specific qPCR or metabarcoding (identifying all species in a sample). Applications: detecting rare or cryptic species (great crested newt, giant panda from water samples); monitoring invasive species early in establishment; assessing fish community diversity without direct capture; whale populations from ocean water samples. eDNA surveys can detect species at densities too low for conventional surveys, at lower cost, and without disturbing animals.