LIZARDS

images (7)Lizards are reptiles that primarily eat insects. However some lizards do eat other vertebrates and sometimes even plants. Most lizards are herbivores. But some like the Komodo dragon in the Indonesian islands feed on mammals.images (6)

Lizards are ectotherms meaning their activity depends on their external temperature. Global warming is the increase of Earth’s average surface temperature due to effect of green house gases such as carbon di oxide emissions from burning fossil fuels or from deforestation which trap heat that would otherwise escape from Earth. This is a green house effect.download

Lizards respond to global warming in two ways adapt and survive or die. In temperate zones like North America lizards are vulnerable to climate change. Their reproduction is closely tied to narrow windows of time in the spring and summer. Heat doesnot kill the lizards but instead it prevents them from reproduction.in tropical countries like India lizards cannot regulate their body temperature. On hot days they tend not to move around much preferring to laze in cool burrows so as not to get too hot. Global warming causes the weather to get hotter and stay hotter longer and lizards especially species that live in the tropical areas spend more time seeking refuge out of the sun. staying in the shade for such long periods causes irreparable damage to the breeding cycle and eggs donot hatch.download (2)

The disappearance of the lizard population is likely to cause a break in the food chain. Lizards are important prey for many birds snakes and other animals and they are important predators of insects. Thus they are an important part of the food chain.download (1)

Climate change is occurring  too rapidly for lizards to compensate with physiological adaptations to higher body temperatures.

Courteasy    THE HINDU  YOUNG WORLD

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s