Hydroptila berneri - Ross, 1941
Berner's Microcaddisfly
Taxonomic Status: Accepted
Related ITIS Name(s): Hydroptila berneri Ross, 1941 (TSN 115668)
Unique Identifier: ELEMENT_GLOBAL.2.119733
Element Code: IITRI40030
Informal Taxonomy: Animals, Invertebrates - Insects - Caddisflies
Kingdom Phylum Class Order Family Genus
Animalia Mandibulata Insecta Trichoptera Hydroptilidae Hydroptila
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Concept Reference
Concept Reference: Clemson University Department of Entomology (J.C. Morse, ed.). 2002. Last Updated 5 September 2006. Trichoptera World Checklist. Online. Available: http://entweb.clemson.edu/database/trichopt/index.htm.
Concept Reference Code: N02CLE01EHUS
Name Used in Concept Reference: Hydroptila berneri
Taxonomic Comments: Described as morphologically distinct from other HYDROPTILA by Ross. Immature stages remain unknown.
Conservation Status

NatureServe Status

Global Status: G4G5
Global Status Last Reviewed: 31Mar2005
Global Status Last Changed: 31Mar2005
Rounded Global Status: G4 - Apparently Secure
Reasons: Ranges throughout southeastern U.S. and western Great Lakes.
Nation: United States
National Status: N4N5 (31Mar2005)
Nation: Canada
National Status: N3N4 (08Mar2005)

U.S. & Canada State/Province Status
United States Alabama (S1), Arkansas (SNR), Florida (S3), Louisiana (SNR), Minnesota (SNR), North Carolina (SNR), South Carolina (SNR), Texas (SNR), Wisconsin (SNR)
Canada Quebec (SNR)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent: 20,000-200,000 square km (about 8000-80,000 square miles)
Range Extent Comments: Rare in northern Florida (Santa Fe River at High Springs, Alachua County) and southern Louisiana (Talisheek Creek, Tammanay Parrish), and Alabama USA but widespread elsewhere.

Number of Occurrences: > 300

Population Size: 1 - 1000 individuals

Overall Threat Impact Comments: Habitat prone to pollution, siltation, and other forms of environmental degradation.

Short-term Trend: Unknown

Other NatureServe Conservation Status Information

Inventory Needs: Survey for additional EOs and estimate relative abundance and density at known EOs.

Protection Needs: Protect inhabited stretches of Santa Fe River and Talisheek Creek, including substantial terrestrial and aquatic buffers.

Global Range: (20,000-200,000 square km (about 8000-80,000 square miles)) Rare in northern Florida (Santa Fe River at High Springs, Alachua County) and southern Louisiana (Talisheek Creek, Tammanay Parrish), and Alabama USA but widespread elsewhere.

U.S. States and Canadian Provinces
Color legend for Distribution Map
Endemism: occurs (regularly, as a native taxon) in multiple nations

U.S. & Canada State/Province Distribution
United States AL, AR, FL, LA, MN, NC, SC, TX, WI
Canada QC

Range Map
No map available.

U.S. Distribution by County Help
State County Name (FIPS Code)
FL Alachua (12001), Bradford (12007), Calhoun (12013), Clay (12019), Gilchrist (12041), Hamilton (12047), Hillsborough (12057), Jackson (12063), Lake (12069), Levy (12075), Liberty (12077), Manatee (12081), Marion (12083), Putnam (12107), Seminole (12117), Suwannee (12121), Washington (12133)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
03 Upper St. Johns (03080101)+, Oklawaha (03080102)+, Lower St. Johns (03080103)+, Manatee (03100202)+, Alafia (03100204)+, Hillsborough (03100205)+, Waccasassa (03110101)+, Alapaha (03110202)+, Santa Fe (03110206)+, Apalachicola (03130011)+, Chipola (03130012)+, St. Andrew-St. Joseph Bays (03140101)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
Non-Migrant: N
Locally Migrant: N
Long Distance Migrant: N
Habitat Comments: Unknown.
Economic Attributes Not yet assessed
Management Summary
Biological Research Needs: Immature stages and microhabitat remain unknown.
Population/Occurrence Delineation
Group Name: Caddisflies

Use Class: Not applicable
Minimum Criteria for an Occurrence: Occurrences are based on some evidence of historical presence or current presence of single or multiple specimens (including larvae or adults) at a given location with potentially recurring existence. Evidence is derived from reliable published observation or collection data; unpublished, though documented (i.e. government or agency reports, web sites, etc.) observation or collection data; or museum specimen information. Sight records and photographs, though valuable, should not be accepted as the basis for new element occurrences as identification of caddisflies often requires close examination of the genitalia of adult males. Instead, such records should be utilized to further study an area to verify the element occurrence in that area.
Separation Distance for Unsuitable Habitat: 5 km
Separation Distance for Suitable Habitat: 5 km
Alternate Separation Procedure: None
Separation Justification: Wiggins and Mackay (1978) found caddisfly distributions separated by trophic category as related to stream resource availability in Eastern streams; and to a lesser degree in Western streams. Shredders predominated in upstream habitats in relation to grazers and collectors, but the proportion of shredders became smaller downstream. Groups have also been separated ecologically into lotic-erosional (running water riffles), lotic-depositional (running water pools and margins), lentic-limnetic (standing water), lentic-littoral (standing water, shallow shore areas), lentic-profundal (standing water, basin), and beach zone (Wallace and Anderson, 1996). For the purpose of occurrence separation, however, the same genera or species often occur across habitats making such habitat classifications impractical.

Regardless of habitat, caddisfly adults tend to remain somewhat near the emergence site (LaFontaine, 1981; Collier and Smith, 1998) where oviposition occurs. Dispersal away from emergence sites tends to be negatively correlated with density of vegetation along the dispersal corridor; caddisflies tend to disperse shorter distances in dense forest compared with more open vegetation (Collier and Smith, 1998). Although dispersal flights are common especially from temporary habitats, such flights are relatively short and only occur immediately following emergence (unlike some Coleoptera and Hemiptera that also disperse additionally in autumn to overwinter) (Cummins and Merritt, 1996). Kovats et al. (1996) estimated that 85% of all adult Hydropsychidae were collected within 100 m of the water's edge with most of the remainder collected within 250 m, although significant, though small, numbers were collected up to 1845 m inland (esp. for Hexagenia). It is worth noting that in some instances, large river caddisflies may disperse a distance greater than five km from the river, suggesting long distance dispersal (Huryn and Harris, 2000; Kovats et al., 1996). Kovats et al. (1996) suggested this longer distance dispersal is likely accidental. Separation distances (unsuitable and suitable) have therefore been set at five km.

Date: 18Oct2004
Author: Cordeiro, J.
Population/Occurrence Viability
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
NatureServe Conservation Status Factors Edition Date: 08Mar2005
NatureServe Conservation Status Factors Author: Cordeiro, J. (2005); Golden, W. C. III, and D. R. Jackson (1998)

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

  • Clemson University Department of Entomology (J.C. Morse, ed.). 2002. Last Updated 5 September 2006. Trichoptera World Checklist. Online. Available: http://entweb.clemson.edu/database/trichopt/index.htm.

  • Franz, R. (ed.) 1982. Rare and Endangered Biota of Florida: Volume Six: Invertebrates. University Press of Florida: Gainesville, Florida. 131 pp.

  • Harris, S.C., P.K. Lago, and R.W. Holzenthal. 1982. An annotated checklist of the caddisflies (Trichoptera) of Mississippi and southeastern Louisiana. Part II: Rhyacophiloidea. Proceedings of the Entomological Society of Washington 84(3):509-512.

  • Rasmussen, A.K. 2004. Species diversity and ecology of Trichoptera (caddisflies) and Plecoptera (stoneflies) in ravine ecosystems of northern Florida. Unpublished PhD. Dissertation, University of Florida. 130 pp.

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