Lexi Webster
Biodiversity is a key part of Australia's cultural identity, and nature is integral to the health and well-being of its citizens. Climate change is a significant threat to Australia's biodiversity, and the country is already under stress from habitat degradation, invasive species, and changed fire regimes. The impact of climate change on Australia's biodiversity is evident in the severe droughts, marine heatwaves, and intense fires that have ravaged the country in recent years. By 2030, global temperatures are projected to increase by more than 1.5°C compared to pre-industrial levels, and this will have a profound impact on Australia's ecosystems and species, with over 1000 plant and animal species in NSW alone at risk of extinction.
| Characteristics | Values |
|---|---|
| Climate change impact on biodiversity | Loss of species and reduced biodiversity |
| Impact on ecosystems | Changes to food webs, loss of ecosystem services, altered ecosystems |
| Impact on species | Migration, vulnerability to predation, extinction risk |
| Specific regions impacted | NSW, Queensland, Northern Territory, Western Australia, Victoria, Australian Capital Territory, Tasmania, South Australia |
| Specific biomes impacted | Northern savanna grasslands, southeast Australian sclerophyll forests, hummock grasslands, temperate lowland grassy ecosystems |
| Specific species impacted | Mountain pygmy possum, eucalypt species, mangroves, marine organisms (corals, shellfish), plant species |
| Human activities impacting biodiversity | Pollution, land clearing, habitat degradation, invasive species |
| Conservation strategies | Resilient ecosystems, community involvement, science-based tools, genetic science, adaptation plans |
| Projections | Significant impacts on biodiversity by 2030, widespread and extreme impacts by 2070 |
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What You'll Learn
- Alpine ecosystems and biodiversity are vulnerable to changes in snow depth and temperature
- Aquatic ecosystems are impacted by local changes, extreme weather, and sea level rise
- Terrestrial ecosystems are under threat from climate change and human activities
- Climate change impacts the food web, affecting species that cannot migrate
- Rising temperatures and ocean acidification threaten marine organisms
Alpine ecosystems and biodiversity are vulnerable to changes in snow depth and temperature
Climate change is a key threat to terrestrial ecosystems and species, and it is projected to become more significant in driving changes in biodiversity. Alpine ecosystems and biodiversity are particularly vulnerable to changes in snow depth and temperature.
The Australian Alps are the highest mountain range in Australia, with the country's only peaks over 2,000 meters above sea level. The Alps are a critical area for water production, and their snow cover has been responsible for the evolution of unique plants and animals. However, the Alps are vulnerable to climate change, especially increased temperatures, which will impact the snow cover that many ecosystems, species, and industries rely on.
The effects of climate change on the Alps include shifts in plant species composition and diversity, changes in the timing of flowering, and declines in endangered fauna. The mountain pygmy possum, for example, is facing a decrease in population. The ranges of Australia's eucalypt species are also predicted to shrink in size over the next 60 years. Approximately 90% of areas with concentrations of palaeo-endemism are predicted to disappear or shift their location.
The Alps function as a giant sponge that slowly releases water into rivers and streams. Climate change will reduce snowmelt and rainfall runoff, impacting water availability for agriculture and human consumption. Increased temperatures will also affect cold-climate crops and change the conditions in which they can grow.
Alpine regions are already constrained by high-altitude extreme conditions, such as radiation exposure and high winds. As temperatures rise, species that cannot adapt or migrate to suitable habitats are threatened with extinction. Warmer temperatures will allow some species to move to higher elevations, changing the composition of plant and animal communities.
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Aquatic ecosystems are impacted by local changes, extreme weather, and sea level rise
Aquatic ecosystems in Australia are highly vulnerable to climate change. They are affected by local changes, extreme weather events, and sea level rise.
Local changes include shifts in rainfall patterns, with rainfall generally decreasing in southern Australia and increasing in the north. This has led to more frequent and severe droughts in the south, negatively impacting aquatic ecosystems, flora, and fauna. For example, a 1% reduction in rainfall can lead to a 2-3.5% reduction in streamflow, reducing water inflows into dams and affecting water security. At the same time, the north experiences more flooding events, which also impact aquatic ecosystems and infrastructure.
Extreme weather events, such as marine heatwaves, have had significant impacts on Australia's aquatic ecosystems. Between late 2015 and early 2016, an underwater heatwave, in combination with a severe drought, caused substantial mortality among mangroves along a 1,000 km stretch of coastline in the Gulf of Carpentaria. Additionally, the Great Barrier Reef experienced bleaching due to the same heatwave. Climate change-induced ocean warming and acidification also threaten coral reefs and shellfish production, making it challenging for shellfish and corals to form shells and hard skeletons.
Sea level rise, influenced by factors such as El Niño and La Niña events, poses another threat to aquatic ecosystems in coastal areas. Sea level rise can increase the vulnerability of coastal ecosystems to storm surges associated with intense storms, leading to potential flooding and habitat destruction.
The resilience of aquatic ecosystems and their ability to adapt to these changes is compromised by the ongoing climate change. As a result, biodiversity is impacted, and the pressure on species already threatened by human activities is heightened.
To address these challenges, Australia has implemented strategies such as the Australia's Strategy for Nature 2019-2030, which aims to protect and preserve biodiversity in the face of climate change.
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Terrestrial ecosystems are under threat from climate change and human activities
Terrestrial ecosystems in Australia are under significant threat from climate change and human activities. The country's biodiversity is extremely vulnerable to even moderate climate change, and the impact of climate change on its terrestrial and freshwater systems is less understood than that of its marine ecosystems.
The Australian environment has been dramatically modified in the past 200 years. Climate change is exacerbating existing stressors on the environment, such as habitat degradation, changed fire regimes, and invasive species. It is also adding new stressors, including declining water availability. The resilience of species and ecosystems is being compromised as the climate continues to change, and they are further affected by extreme climate events and other human-induced pressures.
Rising temperatures, changing rainfall patterns, and extreme weather events are putting pressure on species that are already threatened. For example, in NSW, over 1000 plant and animal species are at risk of extinction. As the climatic envelope in which a species can survive changes, some species may be able to adapt or migrate, but many Australian species can only cope with a narrow range of conditions. When species migrate or disappear due to climate change, it can disrupt the food web, affecting other species that rely on them for food or shelter.
Climate change is also causing shifts in plant species composition and diversity, changes in the timing of flowering, and declines in endangered fauna. The ranges of Australia's eucalypt species, for instance, are predicted to shrink in size over the next 60 years. Aquatic ecosystems are also highly vulnerable to climate change, experiencing local changes and the cumulative effects of changes in the surrounding landscape, as well as exposure to extreme climatic events.
To adapt to climate change and preserve biodiversity, Australia needs resilient ecosystems and community involvement in conservation science-based land management.
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Climate change impacts the food web, affecting species that cannot migrate
Climate change is a significant threat to biodiversity in Australia. The country's biodiversity is already under stress from factors such as habitat degradation, changed fire regimes, and invasive species. Climate change is expected to exacerbate these stressors and introduce new ones, such as declining water availability.
In Australia, over 1000 plant and animal species are at risk of extinction due to their inability to adapt quickly to changing climatic conditions. This is particularly evident in alpine ecosystems, where shifts in plant species composition and diversity, changes in flowering times, and declines in endangered fauna have been observed. The mountain pygmy possum, for instance, is facing a decline due to the impact of climate change on snow depth and extent, which are crucial factors for its survival.
Additionally, aquatic ecosystems in Australia are highly vulnerable to climate change. They experience local changes, cumulative effects from alterations in the surrounding landscape, and exposure to extreme climatic events such as floods and droughts. For example, the combination of an underwater heatwave, drought, and a temporary drop in sea level caused significant mortality among mangroves in northern Australia.
The impact of climate change on the food web and species that cannot migrate is a critical concern for preserving biodiversity in Australia. It highlights the urgent need for conservation efforts and adaptation strategies to protect vulnerable species and maintain the resilience of ecosystems.
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Rising temperatures and ocean acidification threaten marine organisms
Aquatic ecosystems and biodiversity in Australia are among the most vulnerable to climate change. They experience local changes, the cumulative effects of changes in the surrounding landscape, and exposure to extreme climatic events such as floods and droughts. For example, the underwater heatwave that caused the 2016 bleaching of the Great Barrier Reef also led to the death of mangroves along a 1,000 km stretch of coastline in the Gulf of Carpentaria.
Rising ocean temperatures and ocean acidification are two significant consequences of climate change that threaten marine organisms. The ocean absorbs excess heat from greenhouse gas emissions, leading to rising ocean temperatures. Increasing ocean temperatures affect marine species and ecosystems, causing coral bleaching and the loss of breeding grounds for marine fishes and mammals. Warmer waters also contribute to sea level rise, which can have devastating effects on low-lying island countries in the Pacific Ocean, destroying housing and infrastructure and forcing people to relocate.
Ocean acidification refers to the decrease in the pH of the ocean due to its absorption of carbon dioxide (CO2) from the atmosphere. The rise in seawater acidity of 30% that we have already seen is affecting some ocean organisms. Ocean and coastal acidification put many marine life forms at risk by impacting their ability to build shells and skeletons, maintain health, and survive during larval growth stages.
Many ocean plants and animals build shells and skeletons out of calcium carbonate, a mineral formed by combining calcium and carbonate, two chemicals found in seawater. Increased acidity slows the growth of calcium carbonate structures and can even dissolve them faster than they form. Some organisms, such as mussels, sea urchins, and crabs, start to dissolve their protective shells to counter elevated acidity in their body fluids, impairing their overall health. Additionally, larvae of many marine fish and invertebrates are especially vulnerable to increased acidity, as it disrupts their development and, in the case of fish larvae, impairs their ability to smell and avoid predators.
While some marine species may be able to adapt to more extreme changes, there will likely be extinctions. During the last great acidification event 55 million years ago, there were mass extinctions in some species, including deep-sea invertebrates. It is also unknown whether acidification will affect jellyfish populations, and there is a fear that they will thrive under warmer and more acidic conditions while most other organisms suffer, potentially leading to jellyfish domination in some ecosystems.
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Frequently asked questions
Climate change is a key threat to biodiversity in Australia, and the country's biodiversity is at risk from even moderate climate change. Climate change affects snow depth and the spatial and temporal extent of snow, which have all declined since the late 1950s. Long-term monitoring of alpine vegetation in Australia has shown shifts in plant species composition and diversity, changes in the timing of flowering, and declines in endangered fauna.
Rising temperatures can alter ecosystems by changing what can grow and live within them. There is evidence that reductions in water vapour in the atmosphere have resulted in pronounced browning and reduced growth rates in 59% of vegetated areas worldwide.
Aquatic ecosystems in Australia are vulnerable to climate change, experiencing local changes and the cumulative effects of changes in the surrounding landscape, as well as exposure to extreme climatic events such as floods and droughts.
Climate change puts pressure on terrestrial ecosystems in southern, eastern and south-western Australia, impacting the quantity and quality of surface water, recharge of groundwater resources, wetland environments, and Indigenous water values and cultural flows.
To adapt to climate change and preserve biodiversity, Australia needs resilient ecosystems and community involvement in conservation science-based tools for land management. Australia's Strategy for Nature 2019–2030 is the national biodiversity strategy and action plan.
