Biodiversity impacts can occur at the species level and at the ecosystem level.
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From there, cameraman Eduardo Aragona and I drove two hours on a bumpy, red-dirt road to arrive at the Estancia Rincon del Socorro, the traditional Argentine ranch that the Tompkins operate, and where guests from around the globe come to get up-close looks at rare species of capybara, caiman, deer and scores of birds.
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And a back-of-the-envelope calculation based on the 1.8m sorts of organism recognised so far as species under the Linnaean system, on the rate at which new species are being discovered and on such ecological matters as the average number of parasites (themselves new species) that each free-living species harbours, suggests the final total may be around 30m.
The 2011 stock take showed there were 1, 462 animals of 218 species at the aquarium.
Yet, beneath the genetic surface, the nine species of southern capuchino do not look like different species at all.
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The way I see it, there are at least six species of procrastinators.
"Natural selection doesn't care one iota about the performance of the elite members of the species at distance running, " he said.
It suggests that if current trends continued, the drier conditions would favour deciduous, canopy species at the expense of other trees.
"But if you look at how many species of animals are in the area, I think it would be less, " Hajduch said.
Fishing representatives in Lancashire, the North East, Yorkshire, Cumbria and North East Lincolnshire are to receive guides to help classify species at sea.
In Prospect Park alone, at least 90 species of native bees flit from flower to flower among the park's sun-dappled golden rod, dandelions and dogwood.
Those participating will also be given materials to help identify at-risk species such as the small-spotted catshark, the starry smoothhound shark and the cuckoo ray.
The activist organization (that uses the ESA to conserve habitat) looked at 110 protected species from all 50 states to determine how well the Act is working for them.
Hovering around city parks and flower beds are masked bees, miner bees, mason bees, plasterer bees, cuckoo bees, leafcutter bees, horned bees, and at least 49 species of sweat bees.
There are at least 260 species of reef-building coral and 70 species of sponges, plus dugong (a manatee cousin), sharks, manta rays, and about 14 species of whale, dolphin, and sea turtles.
In parts of Puerto Rico, for example, there are places where researchers used to hear four species at once and they are now hearing one or two, a subtle but important change.
Levels of all these hormones are also known to be correlated, in the females of at least some species, with the quality of subsequent maternal behaviours such as bonding to newly born offspring.
So you get both the possibility of having new zones along that side of the mountain and then of course for the species at the top of the mountain, there's no place for them to go.
While scientists have known for some time that camels evolved in North America, with the earliest creatures dating to about 45 million years ago, they were astonished to find a species at such a high latitude.
The problem has long been recognized, and the aforementioned Habitats Directive -- a corollary of the 1979 Bern Convention on the Conservation of European Wildlife and Natural Habitats -- introduced a range of measures aimed at protecting endangered species (including plants, birds and fish as well as mammals).
When Lisa Parr, one of my co-workers at Emory University, tested chimpanzees on portraits of their own species, they excelled at it.
One of Pombo's main projects in that job has been to rewrite the Endangered Species Act in a way that would aid companies like Pacific Lumber, environmental activists say, at the expense of threatened species.
At least two other species of goose existed there until people arrived and, presumably, ate them.
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There seem to have been two hominid species present at Swartkrans around two million years ago.
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The phasing in of MSY depends on collecting more scientific data about the rate at which different marine species reproduce.
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Despite having survived as a species for at least 50 million years, black and white rhino have been hunted to near-extinction because of their horns.
"Worldwide, at least 100 marine species are now under individual fishing quota management, " observes an article in the first-quarter 2006 issue of the Milken Institute Review.
Many factors must be considered to understand how shifts at the individual or species level might ripple through an entire ecosystem and affect ocean services and resources.
At my restaurant Kin Shop, which focuses on contemporary Thai food, I've started a Monday night crab dinner series, highlighting at least three different species of crab spread over four courses.
However, when researchers looked at the 14 bird species that lived in both regions, they found that the same level of radiation was associated with twice as large a drop in bird numbers in Fukushima as in Chernobyl.
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