Scientists also catalogued a potentially new type of colorful tetra fish, an unusually pigmented catfish and nine other types of fish after dragging nets through waterways. A 2.3 millimeter (less than an inch) reddish dung beetle that may be the second smallest one in South America was among apparently previously unknown kinds of insects found.
The research team collected data on 1,378 species of plants, birds, mammals, insects, fish and amphibians. The scientists were supported by 30 indigenous men who helped negotiate supply-laden boats through raging rivers and guided them through the forests.
Suriname, a Dutch colony until the 1970s, has made great efforts to protect its rainforests. In 1998, the government created the roughly 4 million-acre (1.6 million-hectare) Central Suriname Nature Reserve, setting aside some 10 percent of the country.
But thousands of illegal miners, many of them Brazilian, have also long worked throughout the interior, contaminating rivers in some areas with mercury used to separate gold from ore.
Researchers found high quality water conditions in the region they studied, but some of their samples had mercury above safe levels for drinking even though there was apparently no upstream mining. Larsen said he believes the mercury is blowing in from mining and industrial activities in neighboring nations.
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David McFadden on Twitter: http://twitter.com/dmcfadd