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How does pollution cause reproductive problems in wildlife?
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ecological disturbance
Aerial view of the remains of trees on a hillside after a forest fire.
Pollution acts as a significant ecological disturbance by introducing endocrine-disrupting chemicals into the environment. These substances interfere with the hormonal systems of wildlife by mimicking natural hormones, blocking receptor activity, or altering endocrine function.12
The reproductive consequences for wildlife are severe and varied:
- Egg Viability: Chemicals like DDT cause eggshell thinning in birds, leading to reduced viability and fewer hatchlings.2
- Developmental Abnormalities: Exposure can impair gonadal development and promote the emergence of intersex individuals, as seen in amphibians exposed to herbicides like atrazine and in swordfish exposed to PCBs.1
- Fertility Reduction: Substances such as phthalates and parabens can decrease sperm motility and viability, directly reducing male fertility.1
- Premature Birth: Contamination has been linked to reproductive failures in mammals, including sea lions delivering pups prematurely.2
These chemicals often bioaccumulate in fat tissues and move up food chains, allowing them to be transferred to developing offspring in the womb or through milk.3