Meghan Hodges
Biological pollution, or biotic pollution, refers to the negative impact on an ecosystem due to the introduction of foreign species. This can lead to a decline in the naturalness of nature conservation areas, adverse economic consequences, and negative impacts on human health. The concept of biotic pollution is important in invasion biology, which involves the study of how invasive species can affect native ecosystems. Various indices, such as the Biotic Index, are used to quantify the level of biotic pollution and assess the ecological condition of an ecosystem. These indices assign scores to different species based on their tolerance to pollution, with sensitive species having higher scores and tolerant species having lower scores.
| Characteristics | Values |
|---|---|
| Definition | Biotic pollution, or biological pollution, refers to the negative impact on an ecosystem due to the introduction of an invasive alien species. |
| Quantification | The impact of biotic pollution can be quantified using indices such as the Biotic Index (BI), which assigns scores to different types of animals based on their sensitivity to pollution. |
| Impact | Biotic pollution can cause a decline in the naturalness of nature conservation areas, adverse economic consequences, and impacts on human health. It can also exacerbate the effects of climate change by destroying natural habitats, making species more sensitive to environmental changes. |
| Examples of Species Tolerance | Mayflies and beetles are sensitive to pollution and are not found in polluted waters. Shrimps have moderate tolerance, while hoglice are more tolerant than freshwater shrimps. Fly larvae, including phantom midge larvae, rat-tailed maggots, and cranefly larvae, can survive in heavily polluted water. |
| Assessment Tools | BINPAS (Biological Invasion Impact online service) and the BPL (Biopollution Level) are tools used to assess the magnitude of biotic pollution. |
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What You'll Learn
- Biotic Index: A quantification method to denote the ecological health of an ecosystem
- Alien species invasion: The impact of non-native species on an ecosystem
- Climate change: Global warming shifts species distribution and agricultural composition
- Habitat destruction: The loss of natural habitats due to urbanisation and agriculture
- Human health: Biotic pollution can have adverse effects on human health and well-being
Biotic Index: A quantification method to denote the ecological health of an ecosystem
The concept of a biotic index was developed by Cherie Stephens to provide a simple measurement of stream pollution and its effects on the biology of the stream. It is a quantification method used to denote the ecological condition of an ecosystem with respect to pollution level. Biotic indices are quantification attributes that indicate the types and abundances of organisms present in a representative sample of the environment. A high biotic index indicates good ecological health with sensitive species present, while a low index signifies pollution dominated by tolerant species. The biotic index works by assigning different levels of tolerance to pollution to the different types of organisms.
For example, the most widely used environmental quality index for benthic macroinvertebrates is AMBI (AZTI's Marine Biotic Index). It assesses the environmental quality of European coastal waters by classifying species into five ecological groups based on their sensitivity to environmental stress. The designation of a species to an ecological group is drawn from literature on species from marine and transitional waters, supplemented by the consensus judgment of experts. The index is based on the relative abundances of species in each group.
Another example is the Sludge Biotic Index (SBI), an objective index based on the protistan community, used to monitor activated-sludge plant performance. The SBI enables operators to define the biological quality of the sludge using conventional numerical values (from 0 to 10) that are grouped into four quality classes. The identification of various protista species is important to obtain an accurate SBI value.
Biotic indices can also be used to assess water quality by comparing the index value calculated from a benthic sample with a predetermined scale of "biological condition." For instance, an index of 4.5 calculated from a test stream sample would indicate "good" water quality on a scale of "excellent" to "very poor."
It is important to note that biotic indices measure just one aspect of ecological condition and may not be robust enough to fully capture ecological health. Species tolerances can vary across natural environmental gradients, and values calculated from appropriate sites in reference conditions are needed to avoid misinterpretation of ecological status.
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Alien species invasion: The impact of non-native species on an ecosystem
Biotic pollution, also known as biological pollution, refers to the change in an ecosystem due to an alien species invasion. The impact of non-native species on an ecosystem can be detrimental, causing ecological, environmental, and economic damage. This is known as "invasion melt down". The introduction of these species can lead to a reduction in biodiversity, adversely affecting the wildlife and habitats they invade.
Invasive alien plant species (IAPS) are a prime example of this. IAPS have been observed to reduce diversity and alter plant traits in wetlands. The red quinine tree, for instance, has invaded the treeless ecosystems of the Galápagos highlands, reducing incoming solar radiation and adversely affecting endemic herbaceous species.
Invasive species often exploit disturbances to an ecosystem, such as wildfires, roads, and foot trails, to colonize an area. They can also take advantage of human-facilitated introductions, which have greatly increased the rate and scale of invasion. For example, human movement through tourism and globalisation has led to the spread of invasive plants even in the ice-free islands of Antarctica.
The impact of invasive species can be seen in the wetlands of China, where Spartina alterniflora, an invasive species, has replaced native macrophytes. This has led to a decline in avian populations due to movement and feeding restrictions. Similarly, certain aquatic invasive alien species have been observed to adversely impact the Benthic Quality Index (BQI) in marine ecosystems, acting as ecological indicators of the health of the marine ecosystem.
The management and control of invasive species pose substantial economic burdens, with expenditures reaching approximately $1.4 trillion annually. The economic impact of invasive alien species alone was estimated to exceed $423 billion annually as of 2019.
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Climate change: Global warming shifts species distribution and agricultural composition
Biotic pollution, or biological pollution, refers to the negative impact of an invasive species on an ecosystem. It is a concept used in invasion biology to describe the decline in the naturalness of nature conservation areas, adverse economic consequences, and impacts on human health.
Climate Change and Species Distribution
The impact of climate change on biodiversity and food security is significant. Species distribution is shifting as a result of climate change, with species moving to higher latitudes, elevations, and depths in response to rising temperatures. This movement can be seen in the case of birds, which may find their main food source unavailable due to shifting temperatures causing earlier growth and ripening.
For example, in Alaska, brown bears are switching their diet from salmon to elderberries as the warming climate causes the berries to ripen earlier. This change in diet then affects other animals in the food web, such as birds that feed on salmon carcasses left by the bears.
Similarly, the spread of invasive species is increasing in some areas due to climate change. These invasive species can outcompete native plants and animals, introducing new diseases and causing other problems. Cheatgrass, for instance, is an invasive species in the western United States that degrades soil nutrients and leads to a loss of biodiversity.
Climate Change and Agriculture
Agriculture is also experiencing economic impacts due to climate change. More frequent and severe heat waves, droughts, and extreme rainfall events, along with expanding pest ranges, can disrupt agricultural practices. For example, there was a 5% decrease in rice yield due to warming above 32.8°C. Warmer environments may also experience more intense rainfall events between prolonged dry periods, affecting crop yields.
In addition, the synchronicity between pollinators and crop flowering may be disrupted due to the sensitive response of insects to climate change, resulting in reduced productivity. The composition of plant and animal communities will be affected by the projected impacts of climate change on wild plant species distribution.
Adaptation and Conservation
To address the challenges posed by species moving outside their current ranges, flexible, proactive, and transboundary management policies are necessary. Conservation planning can help preserve lands and aid populations in thriving. However, development can fragment lands, isolating species and making it harder for them to migrate or adapt to climate change.
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Habitat destruction: The loss of natural habitats due to urbanisation and agriculture
Biotic pollution, or biological pollution, refers to the invasion of an ecosystem by alien species, which causes a change in the ecological condition of that ecosystem. It is a major threat to biodiversity and species extinction worldwide. Human activities such as urbanisation and agriculture are significant contributors to habitat destruction, which is a form of biotic pollution.
Urbanisation and agriculture are major drivers of habitat destruction, also known as habitat loss or habitat reduction. This occurs when a natural habitat can no longer support its native species, leading to a decline in biodiversity and species numbers. Urbanisation refers to the expansion of urban areas, often at the expense of natural habitats. This can include the construction of roads, housing, and other infrastructure, which fragments and degrades natural habitats.
Agriculture, including unsustainable farming practices and the conversion of land for livestock grazing, is a significant contributor to habitat destruction. This is particularly evident in areas of high agricultural output, where intensive farming methods and the conversion of land for livestock grazing can lead to the loss of natural habitats. For example, in the US, less than 25% of native vegetation remains in many parts of the East and Midwest due to agricultural activities.
The expansion of agriculture and urban areas often go hand in hand, as road construction and the establishment of new settlements can lead to the commercialisation of agriculture and the utilisation of more modern machinery, which can have a detrimental effect on habitats. This is evident in the case of Forest City in southern Malaysia, where irreversible reclamation of a Rank 1 wetland occurred prior to environmental impact assessments and approvals, due to the expansion of urban areas and agriculture.
The current rate of deforestation is 160,000 square kilometres per year, which equates to a loss of approximately 1% of the original forest habitat annually. This has severe consequences for the biodiversity that relies on these habitats, with around half of the world's original forests already lost. Tropical rainforests have received the most attention in this regard, with less than 9 million square kilometres remaining of the original 16 million square kilometres. However, other forest ecosystems, such as temperate broadleaf forests, have also suffered significant destruction, with at least 94% disturbed by human activities.
In conclusion, habitat destruction due to urbanisation and agriculture is a significant form of biotic pollution, leading to the loss of natural habitats and a decline in biodiversity. It is important to address these issues and work towards protecting and conserving natural habitats to ensure the survival of plant and animal species worldwide.
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Human health: Biotic pollution can have adverse effects on human health and well-being
Biotic pollution, also referred to as biological pollution, is a concept that falls under invasion biology. It refers to the adverse changes in an ecosystem due to an alien species invasion. This type of pollution can have detrimental effects on human health and well-being.
Water, air, and soil pollution can lead to significant adverse health outcomes in humans, wild and domestic animals, and plants. Environmental contamination is a critical factor in the development of various non-infectious diseases, including cancer and respiratory illnesses. For instance, biological and chemical pollutants facilitate the spread of antimicrobial-resistant genes in the environment, which can have severe implications for human health. Furthermore, pollution contributes to the accumulation of toxic chemicals, heavy metals, and microplastics in the human food chain, causing a range of adverse health outcomes. Unintentional poisonings, for example, often arise from excessive exposure to toxic chemicals, including pesticides, and disproportionately affect individuals in low-income countries.
Atmospheric pollution, driven by anthropogenic activities such as fossil fuel combustion, industrial processes, and power generation, also poses significant risks to human health. The increased concentration of atmospheric pollutants, including particulate matter (PM2.5, PM10), carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxides (NOx), and volatile organic compounds (VOCs), has been linked to various health issues. These pollutants can cause pulmonary disorders, asthma, liver disorders, and even cancers.
Noise pollution, often associated with increased traffic and other anthropogenic activities, is another aspect of biotic pollution that impacts human health. Noise pollution has been linked to high blood pressure, sleeplessness, nausea, and depression. Studies have attributed a significant number of premature deaths in Europe to air and noise pollution, highlighting the urgent need to address these environmental stressors.
The impacts of biotic pollution on human health are interconnected with other planetary crises, including environmental degradation, biodiversity loss, and climate change. These complex interactions can act as multipliers, exacerbating the negative effects on human well-being. For instance, climate change can accelerate the loss of natural habitats, making species more vulnerable to the additional pressure of pollution.
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Frequently asked questions
Biotic pollution, also known as biological pollution, refers to the invasion of an ecosystem by an alien species, and the subsequent impact of this invasion on the ecosystem.
The impact of biotic pollution can be measured using a Biotic Index, which assigns a score to each type of animal, with sensitive species receiving a high score and tolerant species a low score. The index value is then compared with a predetermined scale of "biological condition".
Examples of biotic pollution include the introduction of invasive species such as fly larvae, rat-tailed maggots, and cranefly larvae, which can survive in heavily polluted water and outcompete native species.
Biotic pollution can have a range of negative effects, including a decline in the naturalness of nature conservation areas, adverse economic consequences, and impacts on human health. It can also lead to substantial species extinctions and changes in regional productivity.
To mitigate the effects of biotic pollution, it is important to address the underlying causes such as habitat destruction, urbanisation, and agriculture. International cooperation is often required to effectively protect and restore ecosystems affected by biotic pollution.
