Related Experiment Video
Updated: Jun 21, 2025
00:09
Cortisol Measurement in Koala Phascolarctos cinereus Fur
Published on: August 23, 2019
10.7K
Do Tasmanian devil declines impact ecosystem function?
Torrey Stephenson1, Tara Hudiburg2, Justin M Mathias3
1Department of Soil and Water Systems, University of Idaho, Moscow, Idaho, USA.
Global Change Biology
|July 10, 2024
Summary
Tasmanian devil scat boosts forest productivity and carbon storage by enriching soil nutrients. Declining devil populations may threaten these vital forest functions, especially under climate change.
Area of Science:
- Ecology
- Climate Change Biology
- Soil Science
Background:
- Tasmanian eucalypt forests are carbon-dense but vulnerable to climate change.
- Biotic factors, like animal scat, influencing forest carbon dynamics are poorly understood.
- Tasmanian devil (Sarcophilus harrisii) populations have declined due to a transmissible cancer.
Purpose of the Study:
- To quantify and predict the impact of Tasmanian devil scat on forest productivity and soil organic carbon (SOC) under climate change.
- To assess how changes in scat quality affect nutrient cycling and carbon storage.
- To understand the role of biotic factors in forest ecosystem resilience.
Main Methods:
- Fusion of experimental data and ecological modeling.
- Analysis of nutrient concentrations (nitrogen, phosphorus) in soil.
- Assessment of soil microbial community shifts.
- Projection of forest productivity and SOC under future climate and scat scenarios.
Main Results:
- Devil scat significantly increases soil nitrogen and phosphorus concentrations.
- Scat input shifts soil microbial communities towards fast-growing phyla.
- Devil scat is projected to enhance net primary productivity and microbial biomass carbon through 2100 under climate change.
- Lower-quality scat leads to slower or declining forest carbon pool increases.
Conclusions:
- Biotic factors, specifically Tasmanian devil scat, play a crucial role in nutrient cycling and carbon storage in Tasmanian forests.
- Declining devil populations and altered scat input due to climate change could negatively impact forest productivity and carbon sink capacity.
- Future forest carbon dynamics will be shaped by the interplay between climate change and overlooked biotic interactions.
Related Concept Videos
01:50Threats to Biodiversity
22.2K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.2K
02:07Conservation of Declining Populations
9.6K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
9.6K
02:04Conservation of Small Populations
13.1K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.1K
02:26Ecological Disturbance
17.0K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
17.0K
02:31Habitat Fragmentation
17.5K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
17.5K
02:39Predator-Prey Interactions
16.2K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
16.2K