Habitats of North Carolina
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Lotic Habitats
Piedmont and General Rocky Rivers
Habitat Overview This habitat is defined by aquatic to semi-aquatic species that are associated with rivers that possess extensive areas of riffles: there must be at least a moderate current and plentiful rocks present. All species in this habitat must be able to cope with the scouring action of the rivers.

The Odonates included in this habitat perch as adults on exposed rocks located well out in the water. Foraging and mating take place in the vicinity of the riffles. Nymphs of Neurocordulia are rock-clingers (also clinging to roots and woody debris) (Tennessen, 2018) and may therefore also stick close to the riffles. So may the nymphs of the two damselflies, who live within aquatic vegetation (Schwiebert, 2007). The nymphs of the Gomphurus species, on the other hand, may reside in substrates located away from the rocks. Gomphurus nymphs are burrowers who live in substrates -- sometimes buried quite deeply -- ranging from sand, silt, gravel, and mud (Tennessen, 2018). All of these species generally require the well-oxygenated waters associated with riffle habitats and are usually found only in unpolluted rivers.

Virtually all examples of this habitat occur west of the Fall-line and include species that occur in both the Piedmont and Mountains or in the Piedmont alone. Species restricted to the cooler rivers of the mountains are treated in the Montane Rocky Rivers habitat.

Related NHP Natural Communities Only a single NHP Natural Community (Schafale and Weakley, 1990; Schafale, 2012) intersects this habitat: Rocky Bar and Shore. Most of the subtypes of this community represent shoreline vegetation or that found on gravel and sand bars and can be found along non-rocky rivers and streams. Two subtypes that include riffle species more specifically are the Riverweed Subtype and Water Willow Subtype.
Determining Species
Taxa Global RankState RankProbability of Extirpation (PE)
Calopteryx angustipennis - Appalachian Jewelwing G4S3S40.0020
Gomphurus fraternus - Midland Clubtail G5S10.3584
Gomphurus lineatifrons - Splendid Clubtail G4S20.0460
Gomphurus septima - Septima's Clubtail G3S30.0058
Gomphurus vastus - Cobra Clubtail G5S3S40.0020
Hetaerina americana - American Rubyspot G5S50.000000000
Hylogomphus abbreviatus - Spine-crowned Clubtail G4S3S40.0020
Neurocordulia virginiensis - Cinnamon Shadowdragon G4S10.3584
Carex torta - Twisted Sedge G5S30.0058
Dolomedes scriptus - Striped fishing spider G5S3S40.0020
Harperella nodosa - Harperella G2S10.3584
Justicia americana - American Water-willow G5S4S50.0002
Podostemum ceratophyllum - Hornleaf Riverweed G5S50.000000000
Solidago plumosa - Yadkin River Goldenrod G1S10.3584
Pseudemys concinna concinna
Regina septemvittata - Queen Snake G5S40.0007
Expected Number of Extirpations with a PE value (Sum of PE) = 1.5001
N = Number of Extant Species with a PE value = 13
Average PE = ENE/N = 0.1154
Number of S5 species = 2
Proportion of Secure Species = Number of S5 Species/N = 0.1538
Habitat Risk Index = ENE x (1 – PSS) = 1.2694

Candidates for Inclusion
Habitat Sub-sets
Distribution Map
Survey Coverage Map
Survey Coverage
Survey Priorities
Average Imperilment of Habitat Members
Habitat Conservation Status
High Quality Habitat Occurrence Table
High Quality Habitat Occurrences
Protected Habitat Occurrences
Threats and Trends
Status Summary
Stewardship Recommendations
References Schwiebert, E., 2007. Nymphs, Stoneflies, Caddisflies, and Other Important Insects: Including The Lesser Mayflies (Vol. 2). Rowman & Littlefield.

Tennessen, K.J., 2018. Dragonfly Nymphs of North America: An Identification Guide. Springer.
Updated on 2019-09-08 18:48:50