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Bryelmis Idahoensis [A Riffle Beetle] Forest: Salmon-Challis National Forest Forest Reviewer: Bart L

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Bryelmis Idahoensis [A Riffle Beetle] Forest: Salmon-Challis National Forest Forest Reviewer: Bart L SPECIES: Scientific [common] Bryelmis idahoensis [A Riffle Beetle] Forest: Salmon-Challis National Forest Forest Reviewer: Bart L. Gamett Date of Review: March 16, 2018 Forest concurrence (or Yes recommendation if new) for inclusion of species on list of potential SCC: (Enter Yes or No) FOREST REVIEW RESULTS: 1. The Forest concurs or recommends the species for inclusion on the list of potential SCC: Yes_X_ No___ 2. Rationale for not concurring is based on (check all that apply): Species is not native to the plan area _______ Species is not known to occur in the plan area _______ Species persistence in the plan area is not of substantial concern _______ FOREST REVIEW INFORMATION: 1. Is the Species Native to the Plan Area? Yes_X__ No___ If no, provide explanation and stop assessment. 2. Is the Species Known to Occur within the Planning Area? Yes_X__ No___ If no, stop assessment. Table 1. All Known Occurrences, Years, and Frequency within the Planning Area Year Number of Location of Observations (USFS Source of Information Observed Individuals District, Town, River, Road Intersection, HUC etc.) 1996 4 Bear Basin Creek above Forest Barr, C. B. 2011. Bryelmis Barr Service Road 30, Lemhi County (Coleoptera: Elmidae: Elminae), a new genus of riffle beetle with three new species from the Pacific Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. 1997 1 Elk Creek 20 m above Highway Barr, C. B. 2011. Bryelmis Barr 93, Lemhi County (Coleoptera: Elmidae: Elminae), a new genus of riffle beetle with three new species from the Pacific Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. a. Are all Species Occurrences Only Accidental or Transient? Yes___ No_X__ If yes, document source for determination and stop assessment. b. For species with known occurrences on the Forest since 1990, based on the number of observations and/or year of last observation, can the species be presumed to be established or becoming established in the plan area? Yes_X__ No___ If no, provide explanation and stop assessment c. For species with known occurrences on the Forest predating 1990, does the weight of evidence suggest the species still occurs in the plan area? Yes___ No___ Provide explanation for determination N/A- no known occurrences on the Forest predating 1990 If determination is no, stop assessment d. Map 1, A riffle beetle (Bryelmis idahoensis) in Idaho (IDFG 2017a) IDFG (Idaho Department of Fish and Game). 2017. A riffle beetle (Bryelmis idahoensis). Internet website: https://idfg.idaho.gov/species/taxa/1476808. Accessed on December 1, 2017. e. Map 2, A riffle beetle (Bryelmis idahoensis) occurrences on the Salmon-Challis National Forest (Barr, C. B. 2011. Bryelmis Barr (Coleoptera: Elmidae: Elminae), a new genus of riffle beetle with three new species from the Pacific Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212.) 3. Is There Substantial Concern for the Species’ Capability to persist Over the Long-term in the Plan Area Based on Best Available Scientific Information? Table 2. Status summary based on existing conservation assessments Entity Status/Rank (include definition if Other) NatureServe GNR- Global rank not yet assessed Global Rank NatureServe S3- Vulnerable (At moderate risk of extinction due to a restricted range, relatively few populations (often 80 or fewer), recent State Rank and widespread declines, or other factors) State List IDAPA- Unprotected Wildlife Status SGCN- Tier 2 (Secondary in priority and represent species with high conservation needs—that is, species with longer-term vulnerabilities or patterns suggesting management intervention is needed but not necessarily facing imminent extinction or having the highest management profile) USDA Forest No Region 1 Status Service No Region 4 Status USDI FWS No species profile Other No BLM Status Not reviewed by Xerces Society Table 3. Status summary based on best available scientific information. Species (Scientific and Common Name): Bryelmis idahoensis [A Riffle Beetle] Criteria Rank Rationale Literature Citations 1 A1 Bryelmis idahoensis has been documented at two locations on the Forest Distribution on in tributaries to the Salmon River and North Fork of the Salmon River. It Barr, C. B. 2011. Bryelmis Barr Salmon-Challis appears to have specific habitat requirements (see Criterion 6) and low (Coleoptera: Elmidae: Elminae), a dispersal capability (see Criterion 3). The low number of documented new genus of riffle beetle with occurrences could be attributed to its new species status, difficulty of three new species from the Pacific detection, or rarity. Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. Species (Scientific and Common Name): Bryelmis idahoensis [A Riffle Beetle] Criteria Rank Rationale Literature Citations Based on its habitat requirements, low dispersal ability, and the low number of documented occurrences, B. idahoensis populations and/or habitat could be scarce on the Forest (Rank A1). Confidence is low due to limited occurrence information on the Forest. Confidence in Rank: High, Medium, or Low 2 B B. idahoensis appears to be an Idaho endemic (Barr 2011), although it Barr, C. B. 2011. Bryelmis Barr Distribution in could also occur in undocumented locations in Western Montana (IDFG (Coleoptera: Elmidae: Elminae), a surrounding 2017b). Based on occurrence data, its range extends from St. Joe River new genus of riffle beetle with geographic area (Shoshone County) to the Salmon River (Lemhi County) in Idaho (Barr three new species from the Pacific 2011). Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. For Criterion 2, B. idahoensis is assigned Rank B due to its limited distribution outside the Forest. Even with uncertainty of the true extent IDFG (Idaho Department of Fish of its range, B. idahoensis is still likely to have limited distribution. and Game). 2017b. Idaho State Wildlife Action Plan, 2015. Boise, Confidence in Rank: High, Medium, or Low ID. 3 B Larval stages of all riffle beetles are aquatic, and B. idahoensis adults are Barr, C. B. 2011. Bryelmis Barr Dispersal Capability thought to be aquatic as well (Barr 2011; Elliot 2008). B. idahoensis adults (Coleoptera: Elmidae: Elminae), a are very small, only about 2 mm in length, and only some adults possess new genus of riffle beetle with hindwings (Barr 2011) necessary for flight in beetles. In general, the main three new species from the Pacific dispersal method of riffle beetles is passive drift along stream currents Northwest, U.S.A. The Coleopterists (Elliot 2008). Based on dispersal distances recorded for other riffle beetle Bulletin: Vol. 65: No. 3. 197-212. and drifting invertebrate species, travel upstream or distances further than 20 m is probably rare for B. idahoensis (Elliot 2008). Elliot, J. M. 2008. The ecology of riffle beetles (Coleoptera: Elmidae). B. idahoensis can probably only disperse within corridors of suitable Freshwater Reviews: Vol. 1: pp. habitat (Rank B), and even within suitable habitat dispersal distance is 189-203. likely to be limited. Confidence is medium due to lack of species-specific Species (Scientific and Common Name): Bryelmis idahoensis [A Riffle Beetle] Criteria Rank Rationale Literature Citations dispersal data. Confidence in Rank: High, Medium, or Low 4 A There is no information for abundance or population density of B. Barr, C. B. 2011. Bryelmis Barr Abundance on the idahoensis on or off the Forest (IDFG 2017b). Barr (2011) did find that B. (Coleoptera: Elmidae: Elminae), a Salmon-Challis idahoensis, when encountered at a site, often occurred in large numbers, new genus of riffle beetle with but it was only found at 13 of localities sampled and appeared to have three new species from the Pacific high habitat specificity (see Criterion 6). Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. Based on its habitat requirements (see Criterion 6) and the low number of occurrence records (see Criterion 1), it is probably rare on the Forest IDFG (Idaho Department of Fish (Rank A). Confidence is low due to lack of abundance data. and Game). 2017b. Idaho State Wildlife Action Plan, 2015. Boise, Confidence in Rank: High, Medium, or Low ID. 5 D B. idahoensis is a newly-described, difficult to detect species (Barr 2011). Barr, C. B. 2011. Bryelmis Barr Population Trend on There is no documentation of population trends for this species (Rank D). (Coleoptera: Elmidae: Elminae), a the Salmon-Challis new genus of riffle beetle with Confidence in Rank: High, Medium, or Low three new species from the Pacific Northwest, U.S.A. The Coleopterists Bulletin: Vol. 65: No. 3. 197-212. 6 A B. idahoensis is most likely aquatic in all life stages (see Criteria 3 and 6), Barr, C. B. 2011. Bryelmis Barr Habitat Trend on the and the majority of B. idahoensis specimens have been collected from (Coleoptera: Elmidae: Elminae), a Salmon-Challis cold, first-order, high-gradient streams completely concealed by plant new genus of riffle beetle with cover (Barr 2011). On the Forest, 72% of perennial stream miles have had three new species from the Pacific significant departures of riparian vegetation from historical conditions Northwest, U.S.A. The Coleopterists (USFS 2017a). However, the majority of riparian land type associations Bulletin: Vol. 65: No. 3. 197-212. (LTAs) assessed are trending towards the natural range of variability (NRV), and over 90% of LTAs are within or trending towards the NRV USFS (United States Department of Species (Scientific and Common Name): Bryelmis idahoensis [A Riffle Beetle] Criteria Rank Rationale Literature Citations (USFS 2017a) Agriculture, Forest Service). 2017a. Salmon Challis National Forest Data All streams in which specimens have been found are low-order and likely Assessment, Riparian Ecosystems spring-fed in closed-canopy coniferous forests (Barr 2011). 97% of springs Section (Draft a). are considered within the natural range of variability (NRV) on the Forest (USFS 2017a).
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