Ecological Dynamics of Platypus and Echidna Populations

The platypus and the short-beaked echidna are the only surviving monotremes, representing deeply divergent lineages of egg-laying mammals that occupy a wide range of freshwater and terrestrial habitats across Australia. Platypuses are semi-aquatic foragers whose survival depends on river connectivity, prey availability and water quality, while echidnas are terrestrial insectivores capable of enduring extreme thermal and hydric stress through behavioural adaptations such as torpor and seasonal shifts in activity. Both species display marked life-history variation: platypus populations exhibit sex- and age-specific survival rates, movement patterns and responses to fragmentation, whereas echidnas show flexible home-range sizes, prolonged hibernation or torpor bouts and reproductive timing that overlaps with energy-conserving strategies. Anthropogenic pressures—including dam construction, pollution, land-use change and climate-driven drought—are altering habitat connectivity, contaminant loads and resource distribution, with cascading effects on gene flow, body condition and population viability. Recent advances in telemetry, genetic analysis and non-invasive monitoring are beginning to reveal fine-scale movement ecology, dietary breadth and health metrics, informing risk assessments and management interventions aimed at maintaining evolutionary resilience and ecological function in the face of ongoing environmental change.

Research from Nature Portfolio

Recent studies have demonstrated that major dams act as significant barriers to platypus dispersal, with genetic differentiation between populations above and below impoundments increasing markedly over successive generations. These findings underscore the need for engineered bypasses or managed translocations to restore gene flow and ensure long-term viability. Another investigation has applied DNA metabarcoding to platypus faecal samples, revealing a richer and more diverse macroinvertebrate diet than previously recognised, with Diptera and Ephemeroptera dominating across seasons and sexes. This novel approach improves prey identification, highlights the sensitivity of dietary composition to habitat degradation and offers a powerful tool for monitoring food‐web responses to environmental stressors.

Ecological Dynamics of Platypus and Echidna Populations publication trend

The graph below shows the total number of articles in ecological dynamics of platypus and echidna populations across all publications each year (not limited to Nature Index journals).

Technical terms

Gene flow: Movement of genes between populations through dispersal and breeding, reducing genetic differentiation.

DNA metabarcoding: High-throughput sequencing of mixed environmental or faecal samples to identify species composition of diets or communities.

Environmental DNA (eDNA): Genetic material shed by organisms into water or soil, used to detect presence and distribution without direct observation.

Home range: The area traversed by an individual in its normal activities such as foraging and breeding.

Torpor: A state of reduced metabolic rate and body temperature that conserves energy during adverse conditions.

References

1. First report of accumulation of perfluorooctane sulfonate (PFOS) in platypuses (Ornithorhynchus anatinus) in New South Wales, Australia. Environmental Science and Pollution Research (2024).
2. Life history and dynamics of a platypus (Ornithorhynchus anatinus) population: four decades of mark-recapture surveys. Scientific Reports (2015).
3. Cool Sex? Hibernation and Reproduction Overlap in the Echidna. PLOS ONE (2009).
4. Fragmentation by major dams and implications for the future viability of platypus populations. Communications Biology (2022).
5. Using DNA metabarcoding as a novel approach for analysis of platypus diet. Scientific Reports (2022).
6. Short-beaked echidna (Tachyglossus aculeatus) home range at Fowlers Gap Arid Zone Research Station, NSW. PLOS ONE (2021).
7. Environmental DNA Reveals Habitat Variables Driving Platypus (Ornithorhynchus anatinus) Distribution Across an Urbanised Landscape. Ecology and Evolution (2025).
8. EchidnaCSI – Improving monitoring of a cryptic species at continental scale using Citizen Science. Global Ecology and Conservation (2021).