All Flashcards
What is the effect of DDT biomagnification on bird populations?
Thinning of eggshells, leading to population declines.
What are the effects of methylmercury exposure on humans?
Nervous system damage and developmental issues.
How does the loss of keystone species affect ecosystems?
Can have cascading effects on the entire ecosystem, leading to imbalance.
What is the effect of warmer ocean temperatures on methylmercury levels?
Increased rate of mercury conversion and fish metabolism, leading to higher levels.
What is the effect of biomagnification on human health?
Exposure to toxins through contaminated food sources, leading to various health problems.
What is the effect of DDT persistence in the environment?
Continued disruption of food chains and potential harm to wildlife.
What is the effect of mercury contamination in aquatic ecosystems?
Bioaccumulation in fish and biomagnification up the food chain, posing risks to wildlife and humans.
What are the effects of POPs on the environment?
Long-term contamination, bioaccumulation, biomagnification, and adverse effects on wildlife and human health.
What is the effect of biomagnification on top predators?
Accumulation of high concentrations of toxins, leading to health problems and population declines.
What is the effect of DDT on the reproductive success of birds?
Interference with calcium deposition, resulting in thin and fragile eggshells, and reduced reproductive success.
Why are apex predators most affected by biomagnification?
They consume organisms from lower trophic levels, accumulating higher toxin concentrations.
How does bioaccumulation differ from biomagnification?
Bioaccumulation is within one organism; biomagnification is across the food chain.
What role do small organisms play in biomagnification?
They absorb toxins and pass them up the food chain when consumed.
Why is DDT harmful to birds of prey?
It causes thinning of eggshells, leading to population declines.
How does climate change affect methylmercury levels?
Warmer ocean temperatures increase mercury conversion and fish metabolism, leading to higher levels.
What are the long-term effects of DDT in the environment?
DDT persists in the environment and can still affect ecosystems and disrupt food chains.
How can biomagnification lead to ecosystem imbalance?
Loss of keystone species due to biomagnification can have cascading effects.
What human health problems can result from biomagnification?
Nervous system damage, developmental issues, reproductive failure, and behavioral changes.
Why is biomagnification a global concern?
Pollutants can travel long distances and affect ecosystems far from the source.
How does biomagnification affect human food sources?
Contaminates seafood and other food sources, posing health risks.
What is the key difference between bioaccumulation and biomagnification?
Bioaccumulation occurs within one organism; biomagnification occurs across multiple organisms in a food chain.
Why are apex predators most vulnerable to biomagnification?
They consume organisms from lower trophic levels, accumulating higher concentrations of toxins.
How does biomagnification affect human health?
Consumption of contaminated fish or meat can lead to neurological damage, developmental issues, and other health problems.
Why is DDT considered a threat to the environment?
It persists in the environment, biomagnifies in food chains, and causes reproductive problems in birds.
How does climate change relate to methylmercury?
Warmer ocean temperatures increase mercury conversion to methylmercury and fish metabolism, increasing methylmercury levels.
Explain the role of solubility in bioaccumulation.
Fat-soluble toxins are more likely to bioaccumulate because they are stored in fatty tissues and not easily excreted.
What role do bacteria play in methylmercury formation?
Bacteria convert inorganic mercury into organic methylmercury, a more toxic form.
How can biomagnification lead to population declines?
Reduced fertility and increased mortality in top predators can lead to population declines and even extinctions.
What are the implications of losing keystone species?
The loss of keystone species can have cascading effects on the entire ecosystem, leading to significant ecological changes.
Why are aquatic ecosystems particularly vulnerable to biomagnification?
Pollutants easily enter water systems, and aquatic food chains tend to be longer, leading to greater biomagnification.