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Range extension of Megachile lanata (Hymenoptera: Megachilidae), a non-native sunn hemp pollinator, in Florida.

Megachile lanata (F.) (Hymenoptera: Megachilidae) is a polylectic pollinator that is native to India and northern Africa. It was introduced to the Antilles during slave trading sometime during the sixteenth to eighteenth centuries (Mitchell 1960; Genaro 2008). The bee was noted as "Habitat in America" in the original species description, which could indicate its presence in the Antilles, or suggest that Fabricius thought the bee was present on the North American mainland (Fabricius 1775). Collection records of the first published occurrence of this species were noted as Kingston and Port Antonio, Jamaica, in 1891 when it was described as Megachile martindalei (Fox 1891). It was noted as present in south Florida in 1958, and was assumed to have come from Cuba (Krombein et al. 1958). Published literature has reported the species in only 2 Florida counties (Miami-Dade and St. Lucie) as recently as 2005 (Leavengood & Serrano 2005). Here we present findings of a single Megachile lanata specimen captured at Halfmoon Wildlife Management Area in northwest Sumter County, Florida, in a blue/yellow vane trap on 4 Apr 2017 during a pollinator restoration experiment. The trap was located in an unmanaged, cow excluded, Bahia (Paspalum notatum Flugge) (Poaceae) pasture that is returning to a longleaf pine (Pinus palustris Mill.) (Pinaceae) flatwoods ecosystem. This finding represents a 260 km (about 160 mi) range extension from the previous county records that spurred this investigation.

A recent publication reported 2 specimens collected in southern Polk County (Campbell et al. 2017), and additional specimens have been collected recently from John U. Lloyd and Lover's Key State Parks in Broward and Lee counties (Abbate 2017). Several different online databases and museum collections were used to increase specimen records used in this study, with previously unpublished date and location information. We also used photographed observations from iNaturalist. The specimen collected in Halfmoon Wildlife Management Area is still the northernmost record. However, by compiling 58 specimen records and observations of M. lanata present in 10 additional counties (Table 1), we were able to roughly map out the species' range shift over time (Fig. 1).

The northern shift of Megachile lanata could affect pollination across the Florida landscape, especially of the Crotalaria (Fabaceae) genus. This bee species could act as a pollinator of Crotalaria juncea L. (Fabaceae) (sunn hemp), which is a beneficial cover crop in Florida. In India, M. lanata is used for pollination of commercially grown sunn hemp; this plant, and several close relatives, have been introduced into Florida. Specimen records indicate that Floridian Crotalaria host plants include C. juncea, as well as C. pallida Aiton, C. retusa L. (all Fabaceae), and Stachytarpheta urticifolia Sims (Verbenaceae). Croatalaria juncea is a rapidly growing, humid temperate, cover crop used to suppress weeds, prevent erosion, improve soil fertility, and provide animal fodder (Krueger et al. 2008). Due to its flower structure, bees must be have sufficient body length and weight to successfully pollinate C. juncea (Krueger et al. 2008). Megachile lanata is the only reported pollinator of C. juncea in Florida. However, other bees in the Megachile genus are present in the state and also may act as suitable pollinators (Krueger et al. 2008). Sunn hemp cultivation in Florida has been limited by low seed production and an absence of effective pollinators. Research investigating other methods to increase seed production through self-pollination and use of ethephon (a growth regulator) did not work consistently, which implies successful seed production to local pollinators (Krueger et al. 2008). More research is required to determine which pollinator species are responsible. All previously listed M. lanata plant hosts are established in Florida and are non-native. One host species, S. urticifolia, is considered invasive, and is listed on the Florida Exotic Pest Plant Council's Invasive Species List (Howell 2017). This suggests that M. lanata could be an invasive bee, but empirical data showing that this species facilitates the spread of S. urticifolia would be required to adequately support such labeling.

With its relatively recent introduction into Florida, little is known about M. lanata ecology in the North American mainland. In Cuba, M. lanata is the most successful habitat generalist of its genus, and thrives in multiple ecosystems while other Megachile are observed only in wooded areas (Genaro 2008). Megachile lanata's generalism may allow this non-native bee to compete with other native bees, particularly in the Megachile genus, partially explaining its northward expansion in Florida. The lack of seasonality in the activity of M. lanata also may contribute to its success and range extension in the state, with specimen collection records occurring in every mo except Dec. As aboveground cavity-nesters, M. lanata could compete for nesting sites with other cavity-nesting bees or wasps. Other non-native Megachile, such as Megachile sculpturalis (Smith) (Megachilidae), have been shown to displace native carpenter bees from their nesting sites (Laport & Minckley 2012; Roulston & Malfi 2012).

Megachile lanata has been present in Florida since 1958, but almost all specimens have been recorded in the past 20 years (56 of 58 records between 1998 and 2018). The northernmost records are within the past 3 yr, indicating that M. lanata's range is rapidly expanding northward, and becoming more common in Florida. Increasing temperatures associated with global climate change and regional land use changes may help explain this northward shift. Access to specimens from India was limited to the Discover Life database (https://www.discoverlife.org); records were found as far as 31[degrees]N. If M. lanata is able to spread to a similar latitude in North America, its range could include all of Florida and parts of the Southeastern Coastal Plain.

We would like to thank the Florida State Collection of Arthropods, Archibald Biological Station, the University of Central Florida, Collection of Arthropods, the University of Kansas Entomology Collection, the American Museum of Natural History, Anthony Abbate, and Sam Droege of the United States Geological Survey Native Bee Inventory for providing us with specimen records. This research was partially supported by the Florida Fish and Wildlife Conservation Commission.

Summary

Megachile lanata, a pollinator of multiple Crotalaria species, spread from North Africa to the Antilles during the 16th to 18th centuries, and is assumed to have entered Florida from Cuba in the late 1950s. This non-native species has spread over 260 km (about 160 mi) north of previously published locations in Florida, and is now present in 12 counties. Its current northernmost record was in Sumter County during Apr 2017 at 28.935[degrees]N.

Key Words: invasive; woolly wall bee; cavity-nesting bee; leaf cutter bee; India; climate change; range expansion

Sumario

Megachile lanata, un polinizador de multiples especies de Crotalaria, se extendiO desde el norte de Africa hasta las Antillas durante los siglos XVI y XVIII y se cree que ingreso a Florida desde Cuba a finales de los anos 50. Esta especie no-nativa se ha propagado por mas de 260 km (alrededor 160 mi) al norte de las ubicaciones previamente publicadas en Florida, y ahora esta presente en 12 condados. Su registro actual mas septentrional fue en el condado de Sumter en abril de 2017 a 28.935[degrees]N.

Palabras Clave: especie invasiva; abeja de pared lanuda; abeja anidadora de cavidades; abeja cortadora de hojas; India

References Cited

Abbate AP. 2017. The native bees (Hymenoptera: Apoidea: Anthophila) of coastal dune environments of Florida. Masters Thesis, Department of Entomology, University of Florida, Gainesville, Florida, USA.

Campbell J, Smithers C, Irvin A, Kimmel C, Stanley-Stahr C, Daniels J, Ellis J. 2017. Trap nesting wasps and bees in agriculture: a comparison of sown wildflower and fallow plots in Florida. Insects 8: 106-115.

Fabricius JC. 1775. Systema Entomologiae: Sistens Insectorvm Classes, Ordines, Genera, Species, Adiectis Synonymis, Locis, Descriptionibvs, Observationib-vs. p. 385. Officina Libraria Kortii, Flensburg, Germany.

Fox WJ. 1891. On a collection of Hymenoptera made in Jamaica during April, 1891. Transactions of the American Entomological Society 18: 337-348.

Genaro JA. 2008. Origins, composition and distribution of the bees of Cuba (Hymenoptera: Apoidea: Anthophila). Insecta Mundi 0052: 1-16.

Howell PL. 2017. 2017 FLEPPC List of Invasive Plant Species. Florida Exotic Pest Plant Council. www.fleppc.org (last accessed 27 Jul 2018).

Krombein KV, Hurd P, Smith D. 1958. Hymenoptera of America North of Mexico. USDA Monograph No. 2: 1-271.

Krueger R, Wang K, McSorley R, Gallaher RN. 2008. Artificial and natural pollination of sunn hemp in Florida. Proceedings of the Florida State Horticultural Society 121: 234-237.

Laport RG, Minckley RL. 2012. Occupation of active Xylocopa virginica nests by the recently invasive Megachile sculpturalis in upstate New York. Journal of the Kansas Entomological Society 85: 384-386.

Leavengood J, Serrano D. 2005. A distributional checklist of the leaf-cutting bees (Hymenoptera: Megachilidae) of Florida. Insecta Mundi 19: 173-176.

Mitchell TB. 1960. Family Megachilidae: Megachile (Archimegachile) lanata (Fabricius), pp. 181-182 In Mitchell TB [ed.], Bees of the Eastern United States. North Carolina Agricultural Experiment Station, Raleigh, North Carolina, USA.

Roulston T, Malfi R. 2012. Aggressive eviction of the eastern carpenter bee (Xylocopa virginica Linnaeus) from its nest by the giant resin bee (Megachile sculpturalis Smith). Journal of the Kansas Entomological Society 85: 387-388.

Kevin A. Henson (1), Joshua W. Campbell (2), and David A. Kaplan (1,*)

(1) University of Florida, Department of Environmental Engineering Sciences, 1953 Museum Road, Gainesville, Florida 32611, USA; E-mail: kevinh1212@ufl.edu (K. A. H.), dkaplan@ufl.edu (D. A. K.)

(2) Auburn University, Department of Entomology and Plant Pathology, 301 Funchess Hall, Auburn, Alabama 36849, USA; E-mail: jwc0062@auburn.edu (J. W. C.)

(*) Corresponding author; E-mail: dkaplan@ufl.edu

Caption: Fig. 1. Distribution of Megachile lanata in Florida based on museum specimens, published literature, and online database resources. The northernmost record in Sumter County is over 260 km (about 160 mi) away from the previously published northernmost location in St. Lucie County. The line at 31[degrees]N indicates the northernmost specimen record from its native range in India, which may indicate a possible range in the US.
Table 1. Florida counties with Megachile lanata collection records.
(Note: The Miami-Dade earliest record is based on literature estimates
of Megachile lanata arrival to Florida.)

County       Locale                # of specimens  Earliest   Records
                                                   record

St. Lucie    Ft. Pierce             2              Sep 1990   (a, b)
Collier      Naples                32              Sep 1998   (a, f)
Glades       Lakeport               2              May 2012   (a)
Broward      John U. Lloyd State    3              Jan 1984   (a, b, h)
             Park, Ft. Lauderdale
Sumter       Halfmoon Wildlife      1              Apr 2017   this study
             Management Area
Polk         Bartow                 5              Mar 2016   (g)
Lee          Lovers Key State       4              Jun 2007   (b, h)
             Park, Sanibel
Orange       Wedgefield,            3              Apr 2018   (c, e)
             Oakland, Orlando
Osceola      Epcot                  1              Mar 2018   (e)
Miami-Dade   Kendall, STA 3/4       2              1958       (b, e, i)
Palm Beach   Lake Worth             2              Jan 2005   (b)
Seminole     Central Florida Zoo    1              Mar 2016   (c)

(a) Florida State Collection of Arthropods
(b) US Geological Survey Native Bee Inventory and Monitoring Laboratory
(c) University of Central Florida Collection of Arthropods
(d) Archibald Biological Research Station
(e) iNaturalist Research Grade Observations
(f) Museum of American Natural History
(g) (Campbell et al. 2017)
(h) (Abbate 2017)
(i) (Krombein et al. 1958)


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Author:Henson, Kevin A.; Campbell, Joshua W.; Kaplan, David A.
Publication:Florida Entomologist
Article Type:Report
Geographic Code:1U5FL
Date:Mar 1, 2019
Words:1842
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