Biodiversity can be defined as variety of life in a particular habitat, ecosystem or part of the world. The biodiversity hotspot I chose to research about is New Caledonia. New Caledonia is considered a biodiversity hotspot because even though it is smaller then other hot spots, it is extremely diverse and greatly supports endemism. New Caledonia is a series of islands located in the South Pacific.
New Caledonia is a terrestrial biome with tropical and subtropical dry broad lead forests; tropical dry forest. It has an Marine ecosystem because it is an island, coral reefs play a big role in the ecosystem.
New Caledonia has a high level of net primary productivity, 7,600 kcal/m2/year.
With the great diversity the species living on the island contribute to the ecosystem. There is commercial fishery, underwater tourism, protection against waves as well as, bringing research and education about species. Within the small island there is a lot of ecological biodiversity. The humid forests have the most biodiversity on the island but has decreased tremendously. As the island was once 70% covered by these forests but is now only 22% covered by them. Maquis, dry dense shrubs cover 89% of New Caledonia. Dry Forests are also a part of the island but there is only 2% of the original forest remaining. The freshwater marshes are located at the southern end of the island, the rarest conifer forests are found to grow here. Mangrove swamps make up 80% of the costal line. These swamps have estuaries and lagoons with high biodiversity. They also protect the island from waves and saltwater. As far as species go, New Caledonia has a wide variety of rare birds, fish, invertebrates, reptiles, mammals and plant species.
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| Crow Honeyeater bird in New Caledonia. |
The environmental degradation threatening this hotspot is nickel mining, bush fires, logging, hunting and illegal collection of animals and alien invasive species. The nickel mining has caused the most damage as it leads to forestation and habitat destruction. The erosion from the mining devastated areas caused siltation and destruction of streams and offshore coral areas. Alien invasive species such as, ship rats, fire ants and Indonesian deer destroy the ecosystem and species. Cultural influences in New Caledonia are that it is a small isolated island making it extremely vulnerable for introduced species to take over. These new species impact the native species creating a decrease. As for political influences, the population density has increased by 2.3% as in 1995 it was about 30 per kilometer. A very large decrease is very bad for the hotpot. More trees and habitats being cut down/lost creates an increase in extinction. Degradtion will increase as the ecosystems become more controlled by humans. Human activities has reduced the original vegetation by 75%. Economically open cast miners have been scraping out soil creating a dramatic issue. Resulting from the soil erosion then led to metal-rich sediment transport downstream into rivers and the lagoon. As for the global economic influences, deforestation from logging, mining, uncontrolled fires and tourism all increase pressure on the ecosystem. All of these activities are putting the habitats into danger which put stresses to keep up the ecosystem.
As for extinct/endangered species, New Caledonia doesn't have to many as of right now. The New Caledonian Loriket went extinct in 1913 as well as the New Caledonian Rail in the 20th century. Both part of the vast variety of birds. The phoboscincus bocourti is a lizard that was discovered by a single man in 1870 but then was never seen again and was presumed to be extinct. In 2003, this species was rediscovered but there are not many. The New Caledonian imperial pigeon is on the endangered list in New Caledonia due to habitat loss.
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| New Caledonian Imperial Pigeon |
To help the ecosystem be restored there have been some different types of conservations being implemented. The ICUN (
International Union for Conservation of Nature) plans and manages decisions on the land. Assessments are used to list protected spevies, population size, growth rate, population fluctations, habitat fragmentation, and range size. Since this plan has appeared very time consuming and sometimes the data not there to assess, there is another conservation called the Narrow Endemic Species (NES). Here, people distribute the narrow endemic species to see where the issues are directly coming from. NES assessment can help with more detailed looks at individual species.
Although New Caledonia is one of the smallest hotspots there is, it has one of the most varied plant and animal species. Many of the plants and birds found here are the only ones on Earth, some of the rarest and most incredible. The hotspot has been threatened greatly by mining, logging, fires, hunting as well as invasive species. Human activities have also been contributing by degrading the habitats putting the species in great danger. From the research I have done, the ecosystem included with this island has a lot of benefits as well as carrying some of the rarest species. Therefore, New Caledonia should be known about and we should be able to take action to protect is.
"Surfbirds Birding Trip Report: New Caledonia: The Quest for Kagu Wth Tropical Birding - 4th - 8th July 2007."
Surfbirds Birding Trip Report: New Caledonia: The Quest for Kagu Wth Tropical Birding - 4th - 8th July 2007. N.p., n.d. Web. 08 Dec. 2014.
"New Caledonian Imperial Pigeon (Ducula Goliath)."
ZooChat RSS. N.p., n.d. Web. 08 Dec. 2014.
"EIC Conservation Database."
EIC Conservation Database. EIC, n.d. Web. 08 Dec. 2014.
International, C. (2011). Biological diversity in New Caledonia. Retrieved from http://www.eoearth.org/view/article/150626
"Conservation Priorities in a Biodiversity Hotspot: Analysis of Narrow Endemic Plant Species in New Caledonia."
PLOS ONE:. N.p., n.d. Web. 08 Dec. 2014.
