ENV102

What is the significance of the Australian landscape's age?

The Australian landscape is considered ancient and flat, resulting from environmental change over thousands of years.

What are the key characteristics of Australian soils?

Australian soils are generally poor, nutrient-deficient, and have a major impact on land use.

What are the two distinct soil structural units in the Perth region?

Yilgam Crator (Darling Scarp) and Perth Basin (Swan Coastal Plain).

What are the five distinct soil zones of the Swan Coastal Plain?

Quindalup Dunes, Tamala Limestone (Spearwood Dunes), Bassendean Sand, Guildford Formation, and Yoganup Formation.

Why do Bassendean sands have poor agricultural potential?

They are hydrophobic, have poor water retention, are naturally nutrient deficient, acidic, and can contain high concentrations of arsenic.

What evidence supports the claim that Perth soils are old?

Perth is tectonically stable with no earthquakes or volcanoes, consistent weather, and flat terrain indicating extensive weathering.

What adaptations have Australian vegetation made to cope with environmental conditions?

Adaptations include drought resistance, low nutrient tolerance, and fire resilience.

What defines a biodiversity hotspot?

A biogeographic region with significant biodiversity that is threatened by human habitation.

Why is South-West Western Australia considered a biodiversity hotspot?

It is home to 7,380 plant species, 49% of which are endemic, and has the highest number of rare and endangered plant species in Australia.

What natural disturbances shape Australian vegetation communities?

Natural disturbances include fire and land clearing, which significantly impact vegetation structure.

How do vegetation communities respond to fire events over time?

Early on, weeds invade; mid-term, resprouters recover; long-term, the community returns to pre-fire conditions.

What are some factors that affect vegetation recovery after a fire?

Severity of the fire, timing, location, existing plant species, and fire frequency.

What are some threats to vegetation communities along the Swan Coastal Plain?

Threats include clearing for suburbia and agriculture, mining, disease, weeds, water table changes, sea level rise, drought, and fire.

What management strategies are recommended for the Swan Coastal Plain?

Encourage reserves, rehabilitate mining areas, control coastal development, remove weeds, institute water conservation, and plant native species.

What is the role of fire in the Australian landscape?

Fire plays a critical role in shaping vegetation communities and can trigger regeneration and adaptation in plant species.

What climatic conditions characterize a Mediterranean climate?

Hot dry summers, cool wet winters, and clearly defined seasons with more rainfall towards the coast.

How does rainfall influence vegetation growth in South-West WA?

Consistent winter rainfall allows for year-round growth and supports a mosaic of vegetation communities.

What is the importance of understanding the link between soils and vegetation?

It is crucial for effective management and revegetation strategies to ensure ecosystem health.

What are some unique features of Western Australian vegetation?

It is highly adapted to nutrient-poor soils and includes many endemic species, making it unique globally.

What historical event led to the introduction of wolves in Yellowstone National Park?

Wolves were reintroduced in 1995 after being absent for decades, impacting the deer population and ecosystem health.

What ecological changes occurred in Yellowstone National Park after the reintroduction of wolves?

The deer population decreased, allowing vegetation to regenerate and increasing biodiversity, including bird populations.

What is the Swan Coastal Plain's geographical significance?

It is a distinct region with five soil associations and unique vegetation communities, facing various environmental threats.

What are some key management considerations for the Swan Coastal Plain?

Management should focus on conservation, rehabilitation, and sustainable practices to protect biodiversity.

What is the role of soil seed banks in Australian vegetation recovery?

Soil seed banks provide a source of seeds for regeneration after disturbances like fire.

How does the geological stability of Perth affect its soils?

The lack of tectonic activity results in highly weathered soils that are nutrient-poor and problematic for agriculture.

What is wastewater?

Water composed wholly or in part of liquid from kitchens, bathrooms, laundry, toilets, and any kind of sewage, nightsoil, faecal matter, or urine.

What are the two main types of wastewater?

Domestic wastewater and industrial/commercial wastewater.

Why is wastewater treatment necessary?

To protect public health, maintain water quality, and meet legal requirements.

What are the main contaminants found in wastewater?

Suspended solids, organic matter, nutrients, pathogens, heavy metals, refractory organics, and endocrine disrupting compounds.

What does Biochemical Oxygen Demand (BOD) measure?

The amount of dissolved oxygen consumed by aerobic biological organisms to break down organic material over a specific time period.

What is Chemical Oxygen Demand (COD)?

A measure of the oxygen equivalent of organic matter that can be oxidized by a strong chemical oxidizer in an acidic medium.

What does Total Organic Carbon (TOC) measure?

The total organic carbon that can be oxidized to carbon dioxide.

What is the purpose of preliminary and primary treatment in wastewater treatment?

To physically treat wastewater through processes like screening, grit removal, and sedimentation.

What is secondary treatment in wastewater treatment?

A process that includes biological treatment and sedimentation to remove dissolved and suspended organic material.

What is the typical BOD level of secondary effluent?

Generally less than 20 mg/L.

What is the significance of the Woodman Point Wastewater Treatment Plant?

It employs conventional wastewater treatment processes and produces treated wastewater suitable for industrial reuse.

What by-products are generated from wastewater treatment?

Stabilized bio-solids for soil enrichment, bio-gas for electricity, and treated wastewater for industrial reuse.

What is the role of chlorination in wastewater treatment?

Chlorination is sometimes used for odor control of raw wastewater.

What is the function of grit removal in wastewater treatment?

To separate grit from other suspended solids, allowing grit to settle.

What happens during primary sedimentation?

Suspended solids are allowed to settle or float, separating them from the wastewater.

What is the importance of treating wastewater for drinking?

To ensure safe and clean water is available for human consumption.

What is the impact of untreated municipal wastewater?

It can lead to pollution and health hazards in the environment.

What is the discharge method for treated wastewater at Woodman Point?

Treated wastewater is discharged via ocean outfall, located 4 km off Point Peron.

What is the difference between biodegradable and non-biodegradable pollutants?

Biodegradable pollutants can be broken down by chemical reactions or bacteria, while non-biodegradable pollutants are stable substances that degrade slowly.

What is bioaccumulation?

Bioaccumulation refers to the accumulation of substances, such as pesticides or heavy metals, in an organism over time.

What is biomagnification?

Biomagnification is the process where the concentration of pollutants increases as they move up the food chain.

What are point sources of pollution?

Point sources are identifiable sources of pollutants, such as effluent outfalls from factories.

What are non-point sources of pollution?

Non-point sources refer to diffuse sources of pollutants, such as agricultural runoff or acid rain.

What is the difference between discrete and chronic pollution?

Discrete pollution is short-term, such as an oil spill, while chronic pollution is long-term, like nutrient input from sewage.

What are some examples of marine pollutants?

Examples include petroleum hydrocarbons, heavy metals, pesticides, plastics, and radioactive waste.

What are the main sources of oil pollution in the ocean?

Sources include crude oil from tankers, offshore platforms, drilling rigs, and spills of refined petroleum products.

What happens to oil when it spills in the ocean?

Oil spreads to form a thin film, evaporates, dissolves, emulsifies, and can form tar balls.

What are the impacts of oil spills on marine life?

Impacts include mortality of fish, impairment of marine life, death of fish eggs and larvae, and damage to sensitive habitats.

What methods are used to contain oil spills?

Methods include hair booms, floating booms, burning oil off, chemical dispersants, and bioremediation using bacteria.

What are polycyclic aromatic hydrocarbons (PAHs) and their effects?

PAHs come from petroleum and can reduce hatchability in birds and mammals, interfere with reproduction, and lower overall fitness.

What are the natural sources of heavy metals in the ocean?

Natural sources include erosion of ore-bearing rocks, atmospheric inputs, volcanic activity, and riverine inputs.

What are the manmade sources of heavy metals in marine environments?

Manmade sources include industrial discharge, sewage, and drainage from rivers and estuaries.

What is mercury's significance as a pollutant?

Mercury is considered the worst metal pollutant, with known deaths attributed to it, such as in Minamata Bay.

How does mercury enter the food chain?

Mercury is taken up by bacteria in its inorganic form and converted to methylmercury, which then accumulates in organisms.

What are some examples of heavy metals that pollute marine environments?

Examples include mercury, lead, cadmium, copper, and zinc.

What role do bacteria play in the degradation of organic pollutants?

Bacteria can break down organic compounds in pollutants, aiding in the biodegradation process.

What is the impact of oil pollution on tourism?

Oil pollution can deter beachgoers, leading to a loss of revenue for tourism-dependent areas.

What are the effects of oil on sea birds?

Oil can impair buoyancy and thermal insulation in sea birds, affecting their survival.

What are chemical dispersants used for in oil spill response?

Chemical dispersants are used to break down oil into smaller droplets, enhancing its natural degradation.

How do aerial spraying of pesticides affect marine environments?

Aerial spraying can transport pesticides over great distances, leading to contamination of marine ecosystems.

What is the significance of nutrient input from sewage in marine pollution?

Nutrient input can lead to eutrophication, causing harmful algal blooms and degradation of water quality.

Why is methylmercury more toxic than inorganic mercury?

Methylmercury is much more toxic and organisms require considerably longer to eliminate it.

What is a significant source of mercury pollution in marine environments?

Pollution from plastic plants dumping mercuric chloride into the bay.

What are the impacts of tin (Sn) in marine environments?

Low solubility in water, fat-soluble, lethal to animals, and can transmit through food webs.

What are the sources of eutrophication?

Sewage, wastewater effluent, runoff from agriculture, and untreated sewage.

What is eutrophication?

The enrichment of water by nutrients, causing accelerated growth of algae and disturbance to aquatic life.

What are the impacts of eutrophication?

Over-productivity, reduction in phytoplankton species diversity, harmful algal blooms, and anoxia.

What is marine litter?

Human-created waste that has become afloat in the sea or ocean, often accumulating on coastlines.

What are the impacts of radioactive waste on marine environments?

Hazardous to human health, affects overall ecosystem health, and can disrupt food webs.

How does thermal pollution affect marine life?

It can cause thermal shock, decrease dissolved oxygen, and increase metabolic rates of fish.

What is the impact of plastics on marine organisms?

Marine animals can ingest plastics mistaking them for food, leading to starvation or infection.

What is the significance of the 2011 Japan Tsunami in relation to marine debris?

It predicted the drifting trajectories of marine debris, impacting ocean ecosystems.

What are some solutions to marine pollution?

Reduce input of toxic pollutants, treat sewage, ban dumping of wastes, and protect sensitive areas.

What is the consequence of radioactive pollution in the food chain?

Radiation can enter the food chain through plankton and kelp, contaminating fish.

What is the effect of thermal effluents from power plants?

They can degrade water quality by changing ambient water temperature, affecting marine life.

What is the role of phytoplankton in marine ecosystems?

Phytoplankton are sensitive to pollutants and accumulate toxins from the water column.

What is anoxia and how is it related to marine pollution?

Anoxia is a lack of oxygen in water, often resulting from excessive nutrient loading and leading to mass mortalities of marine organisms.

What is the impact of lead (Pb) in marine environments?

Lead forms strong complexes with clay and bioaccumulates in most marine organisms.

How does cadmium (Cd) affect marine life?

Cadmium tends to bioaccumulate, impacting organisms that absorb it faster than they excrete it.

What are the ecological consequences of marine debris?

It can lead to ingestion and entanglement of marine life, disrupting entire food webs.

What is the significance of the OSPAR convention?

It aims to protect the marine environment of the North-East Atlantic from pollution.

What is the relationship between sea level rise and Greenland's ice loss?

Greenland's ice loss contributes to local sea level rise, affecting global sea levels differently across regions.

What is Caulerpa taxifolia and why is it significant?

Known as 'killer algae', it is an introduced marine species that can disrupt local ecosystems.

What is the predicted trend for ship movements by 2024/2025?

Ship movements are predicted to increase to 55,000, raising concerns about ballast discharge and marine species introduction.

What is indoor air pollution (IAP)?

A mixture of pollutants from outdoor air and emissions from indoor sources affecting the air quality in enclosed spaces.

Why is indoor air pollution a problem?

It often has higher levels of pollutants indoors compared to outdoors, leading to significant health risks.

What percentage of time do susceptible groups spend indoors?

More than 80% of their time.

What are common locations where people are exposed to indoor air pollution?

Homes, office buildings, schools, shopping centers, indoor swimming pools, and transit (cars, public transport, aeroplanes).

What factors contribute to increased indoor air pollution levels?

Tight building designs, increased range and volume of indoor sources, and decreased natural ventilation.

What are some major sources of indoor air pollutants?

Sources include smoking, gas appliances, cleaning agents, paints, and biological agents like mold and allergens.

What are some health effects associated with indoor air pollution?

Respiratory symptoms, asthma, allergies, sick building syndrome, neurobehavioral issues, and potential carcinogenic effects.

What is the role of natural ventilation in indoor air quality?

Natural ventilation helps reduce indoor pollutant concentrations but has decreased since the 1970s due to energy cost concerns.

What is the significance of secondary pollutants in indoor air quality?

They are formed from reactions between primary pollutants and physical conditions like temperature and humidity.

What is the impact of formaldehyde levels indoors compared to outdoors?

Formaldehyde levels can be 2 to 20 times higher indoors than outdoors.

What are volatile organic compounds (VOCs) and where are they commonly found?

VOCs are pollutants found in paints, solvents, cleaning products, and can be higher indoors.