These are two different questions and need two different answers.
Climate change could mean warmer temperatures, causing heat stress in the flora or fauna of the ecosytem. It could mean more prolonged droughts, so that some species can not longer survive in the environment. It could alternatively mean more frequent floods, causing destruction of specimens and destabilising the ecosystem. Greater storm activity associated with climate change can also have a deleterious effect on some species, destabilising the ecosystem. Climate change can even favour one species over another and, if they are competitors or prey, create an imbalance that leads to extinction.
Introducing just one new usually has a lesser impact on an ecosystem, although any unforseen effect could result in localised disaster and widespread species extinction. Any loss of plant species could potentially lead to serious erosion and loss of topsoil and even, in the extreme, desertification.
Although throughout Earth's history the climate has always changed with ecosystems and species coming and going, rapid climate change affects ecosystems and species ability to adapt and so biodiversity loss increases. ... Loss of Arctic sea ice threatens biodiversity across an entire biome and beyond.
A Biodiversity crisis is the rapid loss of species and the rapid degradation of ecosystems. This threat is greater than global climate change and the impact will affect the prosperity of humankind.
If the climate is nice more species will come into an area
It is the temperature
The introduction of a new predator can have the species eaten with no time to evolve to defend against it
Although throughout Earth's history the climate has always changed with ecosystems and species coming and going, rapid climate change affects ecosystems and species ability to adapt and so biodiversity loss increases. ... Loss of Arctic sea ice threatens biodiversity across an entire biome and beyond.
A Biodiversity crisis is the rapid loss of species and the rapid degradation of ecosystems. This threat is greater than global climate change and the impact will affect the prosperity of humankind.
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It is the temperature
Climate change could affect the ecosystems of the island nation of Samoa by flooding lowlands with a rising sea level. Much of Samoa is only a few feet above sea level.
By decreasing pH levels in lakes and species habitat.
If the climate is nice more species will come into an area
It is the temperature
The NPS attempts to preserve natural ecosystems and interspecies relationships. The NPS attempts to control or eliminate non-native species when they threaten native species.
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Ecosystems in that area COULD die out. With that if they had a food source in that ecosystem they would loose it which means that they would have to import it.
Population ecologists study the size, density, and structure of populations and how they change over time. ... Ecologists working at the biosphere level may study global patterns—for example, climate or species distribution—interactions among ecosystems, and phenomena that affect the entire globe, such as climate change.