Helena Joyce
Sediment and phytoplankton pollution are two interconnected issues that have a significant impact on marine environments and, consequently, human livelihood. Sediment pollution, primarily caused by construction, agriculture, and deforestation, leads to increased erosion and runoff, resulting in degraded water quality and harm to aquatic life. Phytoplankton, as primary producers and the base of aquatic food webs, are vulnerable to various forms of pollution, including microplastics, which can alter their photosynthesis and growth patterns. The accumulation of pollutants in phytoplankton can lead to biomagnification, affecting higher trophic levels. Understanding and addressing the sources and impacts of these pollutants are crucial for maintaining healthy aquatic ecosystems and mitigating their direct and indirect effects on human life.
| Characteristics | Values |
|---|---|
| Impact of pollution on phytoplankton | Affects abundance, growth strategies, dominance, and succession patterns |
| Impact of pollution on sediments | Erosion and sedimentation is a global issue, primarily associated with agriculture |
| Phytoplankton and pollution | Pollutants may accumulate in phytoplankton and be passed on to other trophic levels, resulting in biomagnification |
| Phytoplankton and microplastics | Microplastics can alter photosynthesis in phytoplankton and reduce feeding rates in zooplankton |
| Phytoplankton and carbon storage | Phytoplankton take up carbon and store it in deep oceans, contributing to the biological carbon pump |
| Sediment pollution causes | Construction activities, agriculture, deforestation, urbanisation, mining operations |
| Sediment pollution effects | Reduced water clarity, smothered habitats, disrupted food chain, limited or prohibited growth of algae and plants |
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What You'll Learn
Microplastics and pollution from shipping activities
Marine environments are affected by a variety of pollution sources, with shipping activities being a significant contributor. The pollution caused by shipping activities can take many forms, including accidental oil spills, ballasting and deballasting activities, and bioinvasion. One of the most pressing concerns within the context of shipping activities is the presence of microplastics.
Microplastics are small plastic particles that result from the degradation of plastics. They are ubiquitous in nature and have far-reaching consequences for both wildlife and humans. These particles can be released into the environment through various pathways, including runoff from land, paint shedding from ships, discarded fishing gear, and abrasion of synthetic textiles and tyres. The presence of microplastics in marine ecosystems poses a significant threat to marine life and the wider ecosystem. They can be ingested by a wide range of organisms, from plankton to larger predatory species, causing physical harm and transferring along the food chain.
The impact of microplastics on phytoplankton, which play a crucial role as microscopic primary producers at the base of aquatic food webs, is particularly noteworthy. Phytoplankton communities are affected by pollution at different levels, including abundance, growth strategies, dominance, and succession patterns. Pollutants may accumulate in phytoplankton and be passed on to higher trophic levels, resulting in the biomagnification of certain pollutants. This can lead to a cascading effect on other organisms within the ecosystem.
Furthermore, microplastics can act as transporters of persistent organic pollutants, such as heavy metals and pesticides, carrying them to areas where they would not naturally occur. This can have detrimental consequences for the health of marine life and the overall ecosystem. The impact of microplastics on phytoplankton and other marine organisms underscores the urgent need for scientific research and policy interventions to address this global issue.
In addition to microplastics, shipping activities contribute to pollution through more traditional forms of waste. Accidental oil spills, for example, can have devastating effects on marine life and ecosystems. Ballasting and deballasting activities can introduce invasive species to new environments, disrupting ecological balances. The complex interplay between microplastics, traditional pollutants, and the various pathways through which they enter marine environments highlights the necessity for comprehensive pollution mitigation strategies that address both land-based and maritime sources.
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Eutrophication and harmful algal blooms
Eutrophication is a process that occurs when the environment becomes enriched with nutrients, increasing the amount of plant and algae growth in estuaries and coastal waters. Sixty-five percent of the estuaries and coastal waters in the contiguous US that have been studied by researchers are moderately to severely degraded by excessive nutrient inputs. These excessive nutrients lead to algal blooms and low-oxygen (hypoxic) waters that can kill fish and seagrass and reduce essential fish habitats.
Eutrophication is caused by human activities that accelerate the rate and extent of eutrophication through both point-source discharges and non-point loadings of limiting nutrients, such as nitrogen and phosphorus, into aquatic ecosystems. This is known as cultural eutrophication. During the 1960s and 1970s, scientists linked algal blooms to nutrient enrichment resulting from anthropogenic activities such as agriculture, industry, and sewage disposal.
Harmful algal blooms (HABs) are a result of eutrophication. HABs reduce water clarity and harm water quality, limiting light penetration and reducing the growth of plants in littoral zones. High rates of photosynthesis associated with eutrophication can deplete dissolved inorganic carbon and raise pH to extreme levels during the day. Elevated pH can, in turn, impair the chemosensory abilities of organisms that rely on perception for their survival. When these dense algal blooms eventually die, microbial decomposition severely depletes dissolved oxygen, creating a hypoxic or anoxic 'dead zone' lacking sufficient oxygen to support most organisms.
Sediment pollution is another major form of pollution that impacts aquatic environments. Sediment pollution has two major dimensions: the physical dimension and the chemical dimension. The physical dimension refers to topsoil loss and land degradation, leading to excessive levels of turbidity in receiving waters and off-site ecological and physical impacts from deposition in river and lake beds. The chemical dimension of sediment pollution is tied to the particle size of the sediment and the amount of particulate organic carbon associated with it. Phosphorus and metals are highly attracted to ionic exchange sites associated with clay particles and small particles. Many persistent, bioaccumulating, and toxic organic contaminants, especially chlorinated compounds, are strongly associated with sediment and the organic carbon transported as part of the sediment load in rivers.
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Climate change and oxygen loss in oceans
Phytoplankton, a diverse group of microscopic, photosynthetic organisms, produce an estimated half of the oxygen in our atmosphere. Phytoplankton are the basis of the ocean food web, sustaining all significant marine life forms. They are critical to the marine ecosystem, but their response to climate change is complex and not yet fully understood.
A 2012 study by Canadian researchers estimated that ocean phytoplankton populations had dropped by 40% since 1950 and were declining at a rate of around 1% per year, with ocean warming from climate change suspected as the cause. However, a 2015 study by the same researchers found that phytoplankton numbers were increasing in near-shore waters over shorter periods and declining in open oceans over longer periods.
Climate change is causing ocean warming, which affects the solubility of oxygen in water. Warmer water can hold less oxygen, and as a result, oxygen from the oceans moves into the atmosphere. This loss of oxygen from the oceans is called deoxygenation and has been occurring since at least the middle of the 20th century. It is caused by human activities such as the burning of fossil fuels, deforestation, and agriculture, which increase greenhouse gas emissions and raise ocean temperatures.
Ocean stratification, or the separation of water into layers based on density, is also influenced by climate change. Global warming has increased stratification in the upper ocean since 1970, limiting vertical water mixing and reducing the exchange of oxygen between the upper ocean and the interior. This further contributes to the decline in oxygen levels in the ocean.
The combination of warming and excess nutrients from agricultural runoff and wastewater causes an increase in phytoplankton, followed by a massive decrease in oxygen levels as microbes consume the remaining nutrients after the phytoplankton die. This process, known as eutrophication, further exacerbates the problem of oxygen loss in coastal areas.
The impacts of ocean deoxygenation are already being felt. Oxygen minimum zones are increasing in size worldwide, harming marine ecosystems and leading to biodiversity loss and changes in species distribution. For example, rising water temperatures and subsequent coral bleaching have affected tropical coral reefs.
To address ocean deoxygenation, it is crucial to reduce greenhouse gas emissions and control nutrient runoff into the ocean. Additionally, implementing long-term monitoring programs and combining oxygen measurements with other biogeochemical sensors will help scientists better understand the patterns of ocean change and predict biological responses to multiple stressors.
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Anthropogenic erosion and sedimentation
Humans have been modifying the planet in a measurable way for thousands of years. Some suggest that we are in a new geological epoch, the Anthropocene, which started in the middle of the twentieth century. Humans are primary agents of geomorphic change, and rates of anthropogenic landscape change likely far exceed the pace of change expected from natural geologic processes.
Agricultural practices such as soil tillage and deforestation increase soil erosion rates, river sediment loads, and landslide susceptibility. Human modification of streams and rivers, particularly by damming, alters channel morphology and flow regime, with consequent impacts on floodplain environments and sediment storage. In a geologic context, such changes are likely unprecedented. Notably, soil losses due to human activities likely exceed continental denudation rates over the last 500 million years of Earth's history.
Pollution by sediment has two major dimensions: the physical dimension of topsoil loss and land degradation, and the chemical dimension of organic contaminants. Sediment runoff can cause murky water that blocks the sunlight phytoplankton need for photosynthesis. Phytoplankton are microscopic primary producers and the base of aquatic food webs. They are impacted by various sources of pollution, including sewage, industrial waste, microplastics, radiation, and heat. Pollutants may accumulate in phytoplankton and be passed on to other trophic levels, resulting in biomagnification.
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Phytoplankton's role in the carbon cycle
Phytoplankton are key players in the Earth's carbon cycle. They are responsible for bringing carbon dioxide (CO2) from the atmosphere into the ocean's biological pump, a process known as carbon fixation. This process helps regulate the amount of CO2 in the atmosphere and keeps the Earth's climate in balance. Phytoplankton fix between 30 and 50 billion metric tons of carbon annually, which is about 40% of the total global carbon fixation.
Like land plants, phytoplankton require sunlight, CO2, nitrogen, and other nutrients to grow and reproduce. They use energy from the sun to combine CO2 and nutrients into carbohydrates, which form their cells. Phytoplankton typically grow faster than land plants, doubling in mass every day by dividing into daughter cells. This rapid growth leads to phytoplankton blooms, which are high concentrations of phytoplankton in the water, containing millions to billions of individual organisms.
The biological pump is a key mechanism in the carbon cycle, where carbon moves from the atmosphere through phytoplankton and up the food chain into the deep ocean. As phytoplankton die and are consumed by zooplankton and other organisms, a small fraction of the carbon they took in during their lifetimes sinks below the sunlight layers of the ocean. This slow movement of carbon is a critical aspect of the carbon cycle.
Climate change and human activities can impact phytoplankton and their role in the carbon cycle. Increased temperatures and changes in ocean currents can reduce the supply of nutrients from the deep ocean, leading to a decrease in phytoplankton populations. Additionally, pollution can affect phytoplankton abundance, growth strategies, and diversity. For example, sediment runoff can cause murky water that limits the sunlight available for phytoplankton photosynthesis. Understanding these impacts is crucial for maintaining healthy aquatic ecosystems and managing the Earth's carbon cycle.
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Frequently asked questions
Pollution affects the abundance, growth strategies, dominance, and succession patterns of phytoplankton communities. Phytoplankton is sensitive to environmental disturbances caused by pollution, such as acidification and altered oxygen levels. Additionally, pollution can reduce sunlight availability for phytoplankton, which is necessary for photosynthesis.
Sediment pollution arises when excessive particles of soil, sand, and silt wash into water bodies, degrading water quality and harming aquatic life. This is primarily due to construction activities, agriculture, and deforestation, which increase erosion and runoff.
Sediment pollution reduces water clarity, affecting the photosynthesis of aquatic plants and animals. It smothers habitats, endangers species that depend on them, and disrupts the food chain. Sediment pollution also impacts the chemical composition of water, with small particles attracting phosphorus and metals, as well as carrying organic contaminants like chlorinated compounds and pesticides.
