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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.
Stress/anxiety; behaviours associated with being exposed to a stressor (e.g. loss of appetite, social withdrawal). [35] Stone chewing; chewing stones or rocks without swallowing them. [36] Tail biting; biting or chewing the tail of another animal. [37] Tail chasing; an animal chasing its own tail in circles. [38]
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 ...
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 ...
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.
“Foodborne illnesses that can result from drinking raw milk can cause gastrointestinal issues such as stomach aches or cramping, diarrhea, and vomiting,” Syers says. But it can also turn deadly.
Wild animals can experience injury from a variety of causes such as predation; intraspecific competition; accidents, which can cause fractures, crushing injuries, eye injuries and wing tears; self-amputation; molting, a common source of injury for arthropods; extreme weather conditions, such as storms, extreme heat or cold weather; and natural disasters.