Search results
Results from the WOW.Com Content Network
Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.
Whereas a biotic stress would include living disturbances such as fungi or harmful insects, abiotic stress factors, or stressors, are naturally occurring, often intangible and inanimate factors such as intense sunlight, temperature or wind that may cause harm to the plants and animals in the area affected. Abiotic stress is essentially ...
Forced moulting; commercial egg-laying hens losing their feathers due to the deliberate removal of food and water for several days. [21] Geophagia; eating soil or sand. [10] Herbivory in carnivorous animals; eating plant material by an animal that is considered to usually be meat-eating. [22]
Cyanobacteria have strict light requirements. Too little light can result in insufficient energy production, and in some species may cause the cells to resort to heterotrophic respiration. [21] Too much light can inhibit the cells, decrease photosynthesis efficiency and cause damage by bleaching.
Anatoxin-a is a very powerful nicotinic acetylcholine receptor agonist and as such has been extensively studied for medicinal purposes. It is mainly used as a pharmacological probe in order to investigate diseases characterized by low acetylcholine levels, such as muscular dystrophy, myasthenia gravis, Alzheimer disease, and Parkinson disease ...
Wild animal suffering is suffering experienced by non-human animals living in the wild, outside of direct human control, due to natural processes such as disease, injury, parasitism, starvation, malnutrition, dehydration, weather conditions, natural disasters, killings by other animals, and psychological stress.
The downward part of the U-shape is caused by stress and as stress increases so does efficiency and performance, but only to a certain point. [39] When stress becomes too great, performance and efficiency decline. Sapolsky has also studied stress in rats and his results indicate that early experiences in young rats have strong, lasting effects.
A link has been suggested between chronic stress and cardiovascular disease. [43] Stress appears to play a role in hypertension, and may further predispose people to other conditions associated with hypertension. [48] Stress may precipitate abuse of drugs and/or alcohol. [5] Stress may also contribute to aging and chronic diseases in aging ...