Even well _ animals die off during abrupt environmental changes.
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Climate change has a significant direct effect on terrestrial animals, by being a major driver of the processes of speciation and extinction.[1] The best known example of this is the Carboniferous rainforest collapse, which occurred 350 million years ago. This event decimated amphibian populations and spurred on the evolution of reptiles.[1] In general, climate change affects animals and birdlife in various different ways. Birds lay their eggs earlier than usual in the year, plants bloom earlier and mammals come out of their hibernation state earlier.[2]
Climate change is a natural event that has occurred throughout history. However, with the recent increased emission of CO2 in the Earth's atmosphere, abrupt climate change has occurred. It has been hypothesized that anthropogenic greenhouse gas forcing has significantly influenced global climate since about 8000 before present (Van Hoof 2006).
Animals have had specific responses to climate change. Species respond to climate changes by migration, adaptation, or if neither of those occur, death. These migrations can sometimes follow an animal's preferred temperature, elevation, soil, etc., as said terrain moves due to climate change. Adaptation can be either genetic or phenological, and death can occur in a local population only (extirpation) or as an entire species, otherwise known as extinction.
Climate changes is projected to affect individual organisms, populations, species distributions and ecosystem composition and function both directly (e.g., increased temperatures and changes in precipitation) and indirectly (through climate changing the intensity and frequency of disturbances such as wildfires and severe storms) (IPCC 2002).
Every organism has a distinct set of preferences or requirements, a niche, and biodiversity has been tied to the diversity of animals' niches.[3] These can include or be affected by temperature, aridity, resource availability, habitat requirements, enemies, soil characteristics, competitors, and pollinators. Since the factors that compose a niche can be so complex and interconnected, the niches of many animals are bound to be affected by climate change (Parmesan Yohe 2003).
One study done by Camille Parmesan and Gary Yohe from the University of Texas at Austin shows the global fingerprint of climate change on natural systems. The results of their global analysis of 334 species were recorded to demonstrate the correlation of patterns consistent with global climate change of the 20th century. Using the IPCC's (Intergovernmental Panel on Climate Change) "levels of confidence", this study proved significant nonrandom behavioral changes due to global climate change with very high confidence (> 95%). Furthermore, an accuracy of 74–91% change in species has displayed predicted change for species in response to climate change.