|Tình trạng bảo tồn|
|Phân loại khoa học|
|Loài (species)||E. nianguae|
|Danh pháp hai phần|
Gilbert & Meek, 1887
Adult Niangua darters move from pools and slow runs to gravel riffles prior to spawning. The spawning season runs from mid-March to đầu tháng 6, but hầu hết the breeding occurs in tháng 4. After spawning, Niangua darters return to the pools and stream runs.
Niangua darters can live four or more years, but few survive longer than two years. Young darters reach sexual maturity after one year. Niangua darters eat the nymphs of stoneflies and mayflies and other aquatic insects.
Habitat and distribution[sửa]
Niangua darters live in clear upland creeks and small to medium-sized rivers with slight to moderate currents. They require continuously flowing streams with silt-free gravel and rock bottoms. These streams typically drain hilly areas with chert or dolomite bedrock. Niangua darters are found hầu hết the year in shallow pools, margins, and stream runs.
Niangua darters occur only in Missouri and are located in counties in the Osage River basin bao gồm: Osage, Maries, Miller, Camden, Hickory, Dallas, Benton, Greene, Webster, Cedar, Polk, and St. Clair counties. The Niangua darter was historically widespread and abundant in these rivers and streams.
Cause of Decline[sửa]
The Niangua darter has declined in numbers during the last 30 years, primarily due to habitat loss from reservoir construction, and stream channelization. Reservoirs isolated populations of Niangua darters and barred them from dispersing between suitable habitats. Land clearing and increased amounts of sediment and nutrients have also caused declines in Niangua darter populations.
|Wikispecies có thông tin sinh học về Niangua darter|
- Gimenez Dixon, M. 1996. Etheostoma nianguae. 2006 IUCN Red List of Threatened Species. Truy cập ngày 4 tháng 8 2007.