|Scientific Name:||Notropis melanostomus|
|Species Authority:||Bortone, 1989|
|Red List Category & Criteria:||Vulnerable B1ab(iii)+2ab(iii) ver 3.1|
|Reviewer/s:||Smith, K. & Darwall, W.R.T.|
|Facilitator/s:||Hammerson, G.A. & Ormes, M.|
This species is listed as Vulnerable because its extent of occurrence is less than 20,000 sq km, area of occupancy probably is less than 2,000 sq km, number of locations may not exceed 10 (or area of occupancy may be severely fragmented), and habitat quality is subject to ongoing degradation.
|Range Description:||Range includes the Blackwater-Yellow river system (Pensacola Bay drainage), Florida; Bay Minette Creek (a tributary to the lower end of the Mobile-Tensaw Delta), Alabama; and lower Pascagoula River system (lower Black Creek and Chickasawhay River), Mississippi (Ross 2001, Boschung and Mayden 2004, Page and Burr 2011).|
|Range Map:||Click here to open the map viewer and explore range.|
This species is represented by at least several distinct occurrences, but these are confined to small portions of only a few watersheds.
Prior to 1995, Notropis melanostomus had been collected from only three localities in Mississippi; eight new localities were discovered in Mississippi in 1995, and the species was first recorded in Alabama in 2003 (O'Connell et al. 2005). There has probably not been enough sampling to accurately represent the actual range-wide distribution of this species.
The total adult population size is unknown but presumably exceeds 10,000. This species can be locally numerous, but overall it is rare (Suttkus and Bailey 1990). The number of individuals in Florida has been estimated to be between 10,000 and 20,000; the species is rarely collected by conventional methods. Page and Burr (2011) characterized this species as rare as localized.
The spotty occurrence of this species in ephemeral habitat makes it difficult to determine trends.
Trend over the past three generations is unknown.
|Habitat and Ecology:||Habitat includes detritus- and silt-bottomed pools and quiet backwaters (variable depth and amount of rooted aquatic vegetation), creeks, small rivers, sloughs, and oxbow lakes (with Bald Cypress and Black Gum) off the main channel of medium-sized to large streams; the species has been observed in mid-water of open areas near aquatic vegetation, and, in other sites, in shallow marginal areas and around submerged dead branches or brush (Bortone 1989, Suttkus and Bailey 1990, Ross 2001, Boschung and Mayden 2004, Page and Burr 2011).|
The type locality was modified by nearby clearing and construction (Suttkus and Bailey 1990). Its preferred habitat is being encroached rapidly by commercial and "domestic" development (Bortone 1989). Development along lower Blackwater River and Pond Creek threatens the occurrence there. Pollution is a major potential threat in most areas. Short life span and periodic habitat drying (e.g., of oxbow lakes) make the species vulnerable to local extirpation.
Jelks et al. (2008) categorized this species as Threatened due to (1) present or threatened destruction, modification, or reduction of habitat or range and (2) restricted range.
Better information is needed on basic ecology, life history, and behavior.
Further surveys, including multiple surveys of single sites, are needed in areas of suitable habitat, including oxbows and backwaters in the Escatawpa and Perdido River systems in Alabama (B. R. Kuhajda). Populations in the lower Blackwater River, Pascagoula River, Chickasawhay River, and Black Creek should be monitored. Shoal River site should be surveyed to determine if the species still exists there.
Maintain natural integrity of stream systems; prevent pollution, over-use of water table, habitat disturbance. Protect lower Blackwater, Shoal and Pascagoula rivers and their tributaries (lower reaches especially). Retain naturally forested corridors along and upstream of occurrences, and prevent development and the placement of septic tanks within associated floodplain.
|Citation:||NatureServe 2013. Notropis melanostomus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 12 December 2013.|
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