Showing posts with label biodiversity. Show all posts
Showing posts with label biodiversity. Show all posts

Monday, March 3, 2008

Seahorses

Seahorses

Why are Seahorses endangered?
  • They are hunted by asian countries for medicinal use.
  • Trawling nets by ships destroy their natural habitat.
  • Storms sometimes push Seahorses onto the shore, or make the seahorses fall off their anchored area e.g. seaweed, macro-algae. *Seahorses cannot live without being anchored on to something, because they cannot swim for long before becoming exhausted.
  • They have predators, such as crabs, rays and tunas.

Information on Seahorses

Seahorses is a very interesting animal, with over 35+ known species. They ae birth to the babies. Their diet consists of brine shrimp, plankton and other microscopic creatures in the sea, and they eat over 3000 shrimp everyday because they have no teeth or stomach and need to eat constantly to stay alive. They live in salt water, and cannot live in fresh water for very long. They are thought to have evolved 40 million years ago. They are a very unique animal because they are the only animal in the world where males gives birth to the babies, because although that the female makes the eggs, she implants the eggs into the male's pouch, which he then fertilises and gives birth to. Their average life span is thought to be from 1-5 years, and can grow from 1 inch to 1 foot, they like to live in warmer waters because it's more calm in warmer water.

What we're doing to preserve/ save them

Since seahorses are a currently endangered species there are of course people trying to save them. CITES (Convention on International Trade in Endangered Species) currently is protecting them, and have made them illegal to hunt. Although this makes Seahorses even more rare, because it makes the seahorses even more expensive for illegal trades to sell. Currently there are places that have a high health gene bank for breeding each one of the seahorse species, to make sure that they cannot be hunted and never become extinct. They are not officially endangered, but research has shown that in the past 5 years, some seahorse populations have decreased by 50%!

What effect would this have on the ecosystem if seahorses became extinct?

Although seahorses may not seem to do any good for the ecosystem, they are actually very important to other animals. Such as those that prey upon seahorses e.g crabs, rays etc... and brine shrimp would over populate greatly. Because seahorses are known to eat 360 brine fish per hour. Baby seahorses provide a meal for some a large variety of plankton eating animals because they are so small.

Thursday, February 21, 2008

Information on the GreyHeaded Flying Fox

The Grey Headed Flying fox is a currently endangered Australian animal that is nocturnal. It is currently very vulnerable in New South Wales, because of loss of habitat the creation of so many suburban areas are getting rid of forests and mangroves fast, and that is where the Grey headed Flying Fox dwells, also another problem is that the Grey Headed Flying Fox has a very slow reproductive rate, one born per year per couple, and it takes males quite long to gain sexual maturity
The Grey Headed Flying Fox has characteristics of :
Has a Grey head, with a red/orange mantle around the neck
They are one of the biggest bats in Australia with a wingspan of over 1m.
They have furry heads.
Although, not a decade ago, Grey Headed Flying Fox's were considered to be fine, and living in millions, but recently it has been that are only 300,000 now, and it has been found that their total population has gone done by 30%
They have a 15 year life span, which lets them survive better then a lot of other animals
Grey Headed Foxes play a big role in helping the regeneration of hardwood forests by pollinating and dropping seeds while they feed. It is estimated that one Grey Headed Flying Fox can disperse 60,000 seeds in one night