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Demographic Variation of Wolbachia Infection in the Endangered Mitchell’S Satyr Butterfly

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Demographic Variation of Wolbachia Infection in the Endangered Mitchell’S Satyr Butterfly insects Article Demographic Variation of Wolbachia Infection in the Endangered Mitchell’s Satyr Butterfly Jennifer Fenner 1, Jennifer Seltzer 2, Scott Peyton 3, Heather Sullivan 3, Peter Tolson 4, Ryan P. Walsh 4, JoVonn Hill 2 and Brian A. Counterman 1,* 1 Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA; [email protected] 2 Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Starkville, MS 39762, USA; [email protected] (J.S.); [email protected] (J.H.) 3 Mississippi Natural Heritage Program, Mississippi Department of Wildlife Fisheries and Parks, Jackson, MS 39202, USA; [email protected] (S.P.); [email protected] (H.S.) 4 The Toledo Zoo, Toledo, OH 43614, USA; [email protected] (P.T.); [email protected] (R.P.W.) * Correspondence: [email protected] Academic Editor: Jaret C. Daniels Received: 1 April 2017; Accepted: 4 May 2017; Published: 9 May 2017 Abstract: The Mitchell’s satyr, Neonympha mitchellii, is an endangered species that is limited to highly isolated habitats in the northern and southern United States. Conservation strategies for isolated endangered species often implement captive breeding and translocation programs for repopulation. However, these programs risk increasing the spread of harmful pathogens, such as the bacterial endosymbiont Wolbachia. Wolbachia can manipulate the host’s reproduction leading to incompatibilities between infected and uninfected hosts. This study uses molecular methods to screen for Wolbachia presence across the distribution of the Mitchell’s satyr and its subspecies, St. Francis satyr, which are both federally listed as endangered and are considered two of the rarest butterflies in North America. The screens confirmed the presence of Wolbachia in the northern and newly discovered southern populations of the Mitchell’s satyr, but not in the St. Francis satyr population. These results combined with previous reports of Wolbachia in N. mitchellii, highlight that Wolbachia infection varies both geographically and temporally in satyr populations. The temporal variance shows the importance of continued monitoring of Wolbachia infection during conservation programs. To reduce the risk of reproductive incompatibilities, it is advised that all individuals collected for conservation purposes be screened for Wolbachia and recommended to avoid the use of infected individuals for captive breeding and translocation programs. Keywords: endosymbiont; cytoplasmic incompatibility; captive rearing; conservation; nymphalid 1. Introduction The Mitchell’s satyr, Neonympha mitchellii mitchellii (French), is often cited as one of the rarest butterflies in North America [1–3] and was first described from southern Michigan [4]. Until recently, the known distribution of N. m. mitchellii included Indiana and Michigan, with historic, now extinct, populations in Ohio, New Jersey, and Maryland. The St. Francis Satyr, N. mitchellii francisci, is restricted to a single location in Fort Bragg, North Carolina and differs from other N. mitchellii populations in several traits, including male genitalia, wing coloration and habitat [1]. Due to the limited number of extant populations of N. m. mitchellii (17 in Michigan and two in Indiana), its extirpation in three states, Insects 2017, 8, 50; doi:10.3390/insects8020050 www.mdpi.com/journal/insects Insects 2017, 8, 50 2 of 7 and the restriction of N. m. francisci to Fort Bragg, both subspecies were placed on the endangered species list and given federal protection [5]. In 2000Insects 2017 and, 8 2001,, 50 eight populations of N. m. mitchelli were documented in east-central Alabama2 of 7 [6]. In 2003, a curator of the Mississippi Entomological Museum (MEM), Terence Schiefer, discovered In 2000 and 2001, eight populations of N. m. mitchelli were documented in east-central Alabama [6]. three populations in northeast Mississippi along the Natchez Trace Parkway. In 2010, staff from the In 2003, a curator of the Mississippi Entomological Museum (MEM), Terence Schiefer, discovered three Mississippipopulations Museum in northeast of Natural Mississippi History along and MEMthe Na initiatedtchez Trace surveys Parkway. to determineIn 2010, staff the from distribution the of N. m. mitchelliiMississippiin Museum Mississippi. of Natural From History 2010 toand 2014, MEM surveys initiated ofsurveys small, to opendetermine to partially the distribution wooded of N. wetlands locatedm. Mitchell’s mitchellii in Satyrs Mississippi. at 15 From sites 2010 across to 2014, Tishomingo, surveys of Itawamba,small, open to eastern partially Prentiss, wooded easternwetlands Alcorn, and Monroelocated countiesMitchell’s Satyrs in Mississippi at 15 sites across (Figure Tishomingo,1). The Itawamba, United States easternFish Prentiss, and eastern Wildlife Alcorn, Service and now Monroe counties in Mississippi (Figure 1). The United States Fish and Wildlife Service now includes includes these southern populations under the Endangered Species Act. these southern populations under the Endangered Species Act. Figure 1. State and county distributions of N. mitchellii. Insert of Unites States of America shows Figure 1.statesState with and N. countym. mitchelli distributions present in grey, of N. and mitchellii a black. dot Insert for ofN. Unitesm. francisci States presence. of America Grey regions shows states with N.reflect m. mitchelli countiespresent N. m. mitchelli in grey, were and sampled a black for dot this for study.N. m. Black francisci filledpresence. circle in North Grey Carolina regions reflect countiesdenotesN. m. Fort mitchelli Braggwere that N. sampled m. francisci for is thispresent. study. Black filled circle in North Carolina denotes Fort Bragg that N. m. francisci is present. Both subspecies of this butterfly are associated with the sedge-dominated edges of wetlands, where an open canopy is present. Several species of sedges (Carex spp.) have been recorded as larval Bothhost subspecies plants [7–10]. of Northern this butterfly populations are associated of N. m. mitchellii with theinhabit sedge-dominated prairie fens, a relatively edges stable of wetlands, where anhabitat, open whereas canopy the is present.southern populations Several species are genera of sedgeslly associated (Carex withspp.) ephemeral have been habitats recorded such as as larval host plantsopen [to7– partially10]. Northern wooded, populationssmall wetlands of nearN. stre m.ams, mitchellii along theinhabit wooded prairie borders, fens, or on a relativelythe edges stable habitat,of whereas wetlands the associated southern with populations beaver activity are [6,9]. generally In North associated Carolina, withthe constant ephemeral interruption habitats of such as plant community succession by ordnance use, prescribed fire, and beaver impoundments has open to partially wooded, small wetlands near streams, along the wooded borders, or on the edges resulted in the persistence of suitable habitat for N. m. francisci at Fort Bragg [10]. Northern of wetlandspopulations associated of N. m. with mitchellii beaver are activityunivoltine [ 6with,9]. just In Northone generation Carolina, per theyear, constant whereas interruptionsouthern of plant communitypopulations successionand those byof ordnanceN. m. francisci use, prescribedare bivoltine, fire, having and beavertwo generations impoundments per year. has In resulted in the persistenceMississippi, the of first suitable flight habitatperiod is forduringN. mearly. francisci to mid-June,at Fort followed Bragg by a [10 second]. Northern flight period populations in of N. m.late mitchellii August. areThe univoltinetwo subspecies with also justshow one clear generation population genetic per year, differences, whereas however southern the recently populations discovered southern populations were genetically indistinguishable from N. m. francisci at one and those of N. m. francisci are bivoltine, having two generations per year. In Mississippi, the first mitochondrial and five nuclear markers [11]. Based on this, the recommendation has been for both flight periodsubspecies is during to continue early to to be mid-June, managed as followed separate endangered by a second species. flight period in late August. The two subspecies alsoCaptive show breeding clear and population translocation genetic programs differences, have become however common the management recently discovered strategies for southern populationsrepopulating were geneticallyendangered species indistinguishable that have highly from fragmentedN. m. francisci distributionsat one [12]. mitochondrial However, these and five nuclearstrategies markers can [11 ].greatly Based increase on this, the the risk recommendation of disease transmission. has been In Danaus for both plexippus subspecies, monarchs, to continue the to be managedtranslocation as separate of mass endangered bred individuals species. for commercial trade can spread spores of the parasite Captive breeding and translocation programs have become common management strategies for repopulating endangered species that have highly fragmented distributions [12]. However, Insects 2017, 8, 50 3 of 7 these strategies can greatly increase the risk of disease transmission. In Danaus plexippus, monarchs, the translocation of mass bred individuals for commercial trade can spread spores of the parasite Ophryocystis elektroscirrha, which can have lethal effects [13]. In many insects, the transmission of bacterial
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