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Andrena coruscata

Authority: LaBerge

Assessment

Date: 1/1/1900

Justification:
This narrative text will summarize all of the previous sections and outline the evidence for determining which Red List Category a species qualifies for, and which criteria were used to make this designation. Red List Categories include LC (Least Concern), NT (Near Threatened), VU (Vulnerable), EN (Endangered), CR (Critically Endangered), DD (Data Deficient), EX (Extinct), and EW (Extinct in the Wild). Red List Criteria include A (population size reduction), B (limited geographic range and severe fragmentation, continuing declines or fluctuation), C (small population size and decline, D (very small or restricted populations), E (quantitative analysis).

Distribution

Country Occurrence:
United States: ColoradoNew Mexico
EOO:Unknown
AOO:Unknown
Map Notes:The map was created by displaying all known observations of the species as points. .

Population

Trend:Unknown
Generation Length:1.00 years

Habitats and Ecology

This species likely nests underground like all other Andrena (Danforth et al. 2019), but nests from this species have not been described. Nest cells from other members of this genus are located at the ends of the lateral burrows, which are typically lined with a waxy Dufour’s gland secretion (Cane 1981) that serves to both isolate the provision from pathogens in the surrounding soil and to regulate water uptake from the soil atmosphere (Cane and Love 2021). Females provision each cell with a ball of pollen moistened with nectar on which they lay a single egg (Michener 2007). Records of this species come from June and July (Chesshire et al. 2023). Adults are assumed to emerge annually (Danforth et al. 2019).

Habitat Types

Use and Trade

This species is not known to be utilized commercially.

Threats

IF OCCURS IN SW: Since 2000, the Southwest U.S. has seen the worst drought in 1200 years (Williams, Cook, and Smerdon 2022). Drought can reduce the abundance of flowering plants on a landscape scale, and also reduce pollen and nectar quality (Wilson Rankin, Barney, and Lozano 2020). Drought conditions have been shown to reduce the diversity and abundance of native bees (Minckley, Roulston, and Williams 2013; Hung et al. 2021). Certain aspects of this species' biology may make it more vulnerable to some threats. Andrena SPECIES is a ground nesting species, and nests may be harmed by certain agricultural practices such as tilling, which can kill bees nesting close to the surface (Williams et al. 2010). This species is a dietary specialist, which has been linked to higher risk of extinction due to reduced host plant availability, especially under climate change scenarios (Roberts et al. 2011) and reduced effective population sizes (Packer et al. 2005). Additionally, Andrena have been reported to have low reproductive output because of the short adult life span, and a low rate of brood cell provisioning (reviewed in Danforth et al. 2019). Other threats to bees generally include habitat loss or modification, climate change, pesticide use, exposure to pathogens from managed bee species, and competition with honey bees (Brown and Paxton 2009; Potts et al. 2010; Wojcik et al. 2018; Grab et al. 2019; Raven and Wagner 2021).
Code Threat Timing Scope Severity
1 Residential & commercial development - 1.2. Commercial & industrial areas - - -
1.1 Residential & commercial development - Housing & urban areas - - -
1.2 Residential & commercial development - Commercial & industrial areas - - -
2 Agriculture and aquaculture - Livestock farming and ranching -> Agro-industry grazing, ranching, or farming - - -
2.1.3 Agriculture & aquaculture - Agro-industry farming - - -
7 Natural system modifications - 7.1. Fire & fire suppression -> 7.1.2. Suppression in fire frequency/intensity - - -
7.1.1 Natural system modifications - Increase in fire frequency/intensity - - -
7.1.2 Natural system modifications - Suppression in fire frequency/intensity - - -
8 Invasive and other problematic species, genes, and diseases - 8.1 Invasive non-native/alien species/diseases -> 8.1.2. Named species - - -
8.1.2 Invasive and other problematic species, genes, and diseases - Named species - - -
9 Pollution - 9.3 Agricultural and forestry effluents -> 9.3.3 Herbicides and Pesticides - - -
9.3.3 Pollution - Herbicides and Pesticides - - -
11 Climate change & severe weather - 11.3.Temperature extremes - - -
11.1 Climate change & severe weather - Habitat shifting & alteration - - -
11.2 Climate change & severe weather - Droughts - - -
11.3 Climate change & severe weather - Temperature extremes - - -

Conservation Actions

Conservation needs No known conservation actions are in place for this species. Observations of this species are known from Bureau of Land Management (BLM) land, but this does not confer any specific protections to the species. Further research is needed to determine the overall size of the population and to identify trends and existing threats. Specific conservation needs for this species have not been identified. Due to the importance of supporting wild bee populations for pollination services, general conservation practices are recommended including, restoring, creating, and preserving natural high-quality habitats to include suitable forage and nesting sites; limiting pesticide use on or near suitable habitat, particularly during the adult bee’s flight period; promoting farming and urban practices that increase pollinator-friendly plants in margin space; minimizing exposure of wild bees to diseases transferred from managed bees; and lastly, avoiding honey bee introduction to high-quality native bee habitat.

Actions Needed

Research Needs

Surveys targeting this species are needed throughout its range to determine its persistence throughout its historic range. More information is needed about the population status, range limits, habitat, and ecology of this species.

Taxonomic Notes

(a. any taxonomic concerns about the validity of the species? b. any taxonomic revisions underway that would require a species reassessment.