MOTHS OF CONBOY LAKE NATIONAL WILDLIFE REFUGE:

Results from 15 sites sampled 28-30 August 2014

Dana Ross 1005 NW 30th Street Corvallis, OR 97330 (541) 758-3006 [email protected] SUMMARY

Macro-moths were sampled from Conboy National Wildlife Refuge in Klickitat County, Washington, 28-30 August, 2014. Blacklight traps were deployed for a single night at fifteen sites representative of plant communities throughout the refuge and captured a total of 407 individuals representing 70 species. Of these, 40 species were documented for the first (17), second (12) or third (11) time from Klickitat County. With sufficient additional sampling, the total macro-moth fauna of the refuge would likely be shown to include more than 300 species.

INTRODUCTION

National Wildlife Refuges protect important habitats for many plant and species. Refuge inventories have frequently included plants, birds and mammals, but - arguably the most abundant and species-rich group in any terrestrial habitat - have largely been ignored. Small size, high biodiversity and a lack of identification resources have all likely contributed to their being overlooked. Certain groups such as moths, however, can be easily and inexpensively sampled and can be identified by regional moth taxonomists. Once identified, many moth species can be tied to known larval host plant species at a given site, placing both moth and plant within a larger ecological context.

Moths along with butterflies belong to the Order . The larvae (caterpillars) are consumers of enormous quantities of plant biomass and help to recycle plant nutrients back into the soil. Most adult moths feed on nocturnally available flower nectar and in doing so pollinate many flowering plant species. As egg, larva, pupa or adult, moths are an abundant and essential food resource for myriad species of birds (especially nestlings), bats, rodents, reptiles, amphibians and other insects. Moths are, therefore, an essential component of a healthy and productive ecosystem.

Sampling that includes the physical collection of moth voucher specimens is necessary as part of any meaningful inventory. Vouchers added to regional collections serve as indisputable evidence of a study’s findings and contribute to a greater knowledge about wing pattern and general morphological variability. When moth information (species, date, location, etc.) is data- based and combined with existing data-sets it can lead to a more resolute understanding of each species range, distribution, flight period and relative abundance.

Each refuge has a unique assemblage of insects where each species serves one or more ecological roles. Moths are a particularly rich insect group that remains largely unknown for most important wildlife areas including our national wildlife refuges. This study is an important first step towards documenting these less conspicuous yet vitally important life forms at Conboy Lake NWR.

1 METHODS

Fifteen trap sites were selected to capture macro-moth diversity by targeting a variety of plant communities and habitat types across a broad portion of the refuge. Sample sites representative of quaking aspen, emergent marsh, ponderosa pine, mixed conifer, Oregon white , upland meadow and wet prairie habitats were selected based on a Conboy Lake Wildlife Refuge habitat map, with specific locations chosen during on-site visits prior to sampling (Figures 1 & 2, Tables 1 & 2, Photos 1-4).

For each site sampled, a 12 volt battery-powered light trap unit was run continuously over one full night (from dusk until dawn) with a 22 watt circular UV-blacklight bulb as a visual attractant. Moths hitting clear acrylic vanes mounted above the trap fall down through a funnel and into a collection bucket charged with a fumigant (“No Pest Strip”) which kills them in short order.

The sample period was chosen to coincide with the new moon, a time when interference from ambient moon light is minimal and the effectiveness of light traps is, therefore, optimal. While warm, calm nights with cloud cover are preferable to cold, rainy or windy nights, most moth species are capable of flying during adverse conditions, thus weather conditions were considered somewhat secondary in importance.

Samples from traps were collected early the following morning, placed in plastic baggies and labeled with location and date using a permanent marker pen. Samples were then transferred to a freezer until all refuge sampling was finished for the sample period. After transfer to the lab in Corvallis, samples were placed again in a freezer until they could be processed.

Processing entailed thawing moths on a large white sheet of paper and sorting/counting all macro-moths to species. Identifications of most moths were determined immediately. Less familiar moths were identified using the Oregon State Collection (OSAC, Dept. of Zoology, Oregon State University, Corvallis) and web-based resources such as the PNW Moths (pnwmoths.biol.wwu.edu) and Moth Photographers Group (mothphotographersgroup.msstate.edu). The most difficult identifications required assistance from other moth experts.

One or more voucher specimens for each moth species sampled were retained, mounted and labeled. Each first voucher specimen was deposited in the OSAC collection. Additional specimens will be placed in the Conboy Lake NWR headquarters collection.

2 Figure 1 - Map of north Conboy Lake NWR moth trap locations.

3 Figure 2 - Map of south Conboy Lake NWR moth trap locations.

4 Table 1. Moth site GIS attributes I.

Trap # Trap Code Habitat Type Date Sampled 1 Ponderosa 1 Ponderosa Pine 8/28/2014 2 Upland Meadow 1 Upland Meadow 8/28/2014 3 Aspen 1 Aspen 8/28/2014 4 Oak 1 Oregon White Oak 8/28/2014 5 Mixed Conifer 1 Mixed Conifer 8/28/2014 6 Wet Meadow 1 Wet Meadow 8/29/2014 7 Emergent Marsh 1 Emergent Marsh 8/29/2014 8 Upland/Wet Meadow Mix 1 Upland/Wet Meadow 8/29/2014 9 Upland Meadow 2 Upland Meadow 8/29/2014 10 Aspen 2 Aspen 8/29/2014 11 Aspen-Conifer Mix 1 Mixed Aspen-Conifer 8/30/2014 12 Wet Meadow 2 Wet Meadow 8/30/2014 13 Mixed Conifer 2 Mixed Conifer 8/30/2014 14 Ponderosa 2 Ponderosa Pine 8/30/2014 15 Oak 2 Oregon White Oak 8/30/2014

Table 2. Moth site GIS attributes II.

GPS Coordinates (10T) Elevation Trap # Northing Easting (feet) 1 627657 5091913 1900 2 625446 5088181 1840 3 625825 5087223 1895 4 628080 5087541 1875 5 629917 5088673 1940 6 629629 5093316 1820 7 628946 5093395 1820 8 631566 5092658 1825 9 632517 5091345 1825 10 632322 5091134 1835 11 631954 5091968 1825 12 634239 5093071 1820 13 635001 5093756 1900 14 633773 5091012 1960 15 631860 5090258 1880

5 Photo 1. Blacklight trap in aspen understory (Aspen 1 site).

6 Photo 2. Blacklight trap in Oregon white oak habitat (Oak 1 site).

Photo 3. Ponderosa pine/bitterbrush habitat (Ponderosa 1 site).

7 Photo 4. Blacklight trap in upland meadow habitat (Upland Meadow 2 site).

Photo 5. Nocturnal moth sampling set-up: blacklight trap and 12 volt battery.

8 RESULTS & DISCUSSION

A total of 407 individual macro-moths representing 70 species (Table 4) were sampled from all refuge moth sites combined during the August 28-30, 2014 sample period. A total of 29 moths (7%) could not be identified to species due to wing damage and no identifiable wing pattern. Individual samples (Table 3) ranged in size from 4 to 67 moths and included from 4 to 28 species. Habitats with at least some forest overstory (N=9) scored higher than open, non- canopied sites (N=6) for both average moth abundance (37 versus 12) and moth species richness (13 versus 6).

In general, sites with a more complex, 3-dimensional structure that host more plant species and more plant biomass will support more moths and moth species per unit area. The greatest numbers of moths were sampled from the Oak 1 (67), Mixed Conifer 1 (54) and Aspen 2 (54) sites. Similarly, the most moth species were sampled from Mixed Conifer 1 (28), Oak 1 (26) and Aspen 1 (17) sites. The fewest moths were sampled from Upland Meadow 1 (9), Wet Meadow 1 (8) and Emergent Marsh 1 (4). The fewest moth species were sampled from Upland/Wet Meadow Mix 1 (4), Wet Meadow 1 (4) and Emergent Marsh 1 (4).

This study provided important distributional data (1st, 2nd or 3rd Klickitat County records) for at least 40 moth species (Table 4) in the families , Lasiocampidae, Lymantriidae and based on the Pacific Northwest Moths website (http://pnwmoths.biol.wwu.edu/). This same level of comprehensive regional knowledge is not yet available for the family Geometridae, thus no distributional statements are made for that family of moths at this time.

Table 3. Numbers of moths and moth species by trap (code).

# of # of Trap Code Moths Species Ponderosa 1 39 12 Ponderosa 2 12 7 Mixed Conifer 1 54 28 Mixed Conifer 2 28 14 Aspen-Conifer Mix 1 19 8 Aspen 1 40 17 Aspen 2 54 16 Oak 1 67 26 Oak 2 24 12 Upland Meadow 1 9 9 Upland Meadow 2 22 9 Upland/Wet Meadow Mix 1 11 4 Wet Meadow 1 8 4 Wet Meadow 2 16 8 Emergent Marsh 1 4 4

9 Table 3. Macro-moth abundance by trap site (*Micro-moth. County Records: 1= 1st, 2= 2nd, 3= 3rd).

Family Taxon 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Total * ophionalis P n/a erechtea 2 2 2Catocala relicta 2 2 Erebidae 1Cisseps fulvicollis 4 4 americalis 2 1 4 7 Aplocera plagiata 1 2 2 1 1 1 1 2 4 1 16 Chlorochlamys triangularis 1 1 Coryphista meadii 1 1 Cyclophora dataria 1 2 1 4 Drepanulatrix unicalcararia 4 5 1 4 14 Lambdina fiscellaria 1 1 Neoalcis californiaria 1 4 5 10 Nepytia umbrosaria 8 2 4 14 Geometridae Perizoma curvilinea 1 2 1 1 5 Sabulodes edwardsata 2 2 magnoliata 1 1 Speranza colata 15 15 Stenoporpia dejecta 1 5 6 Stenoporpia pulmonaria 1 5 5 11 defensaria 1 1 lignicolorata 1 1 2 1 5 Lasiocampidae 1Tolype distincta 1 1 4 5 1 2 14 Lymantriidae 2Orgyia pseudotsugata 1 1 Abagrotis apposita 2 1 3 6 2Abagrotis placida 1 1 3Abagrotis reedi 1 1 3Adelphagrotis indeterminata 1 1 1 3 1Capsula oblonga 1 1 Caradrina meralis 1 1 4 6 1Apamea devastator 1 1 1Diarsia rosaria 2 1 3 Noctuidae Dichagyris variabilis 2 1 5 2 4 4 2 20 1Enargia decolor 1 3 2 6 3Euxoa aequalis 1 1 bochus 1 1 2 2Euxoa comosa 1 1 2Euxoa hollemani 1 1 2Euxoa intrita 6 1 7 3Euxoa perexcellens 1 1 1Euxoa rufula 1 1 Table 3. Macro-moth abundance by trap site (continued).

Family Taxon 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Total Noctuidae Euxoa satis 3 3 Feltia jaculifera 1 6 5 12 1Helotropha reniformis 1 1 1 3 Homorthodes communis 2 2 5 9 1Hydraecia obliqua/medialis 3 1 4 2Lacinipolia olivacea 1 1 2 stricta 1 4 3 2 5 1 12 3Leucania farcta 1 1 3Mesogona olivata 2 4 1 1 1 3 12 1Mythimna oxygala 1 1 3 1 2 8 1Nedra dora 1 1 2Neoligia tonsa 1 1 1Nephelodes minians 2 2 3Noctua pronuba 3 1 3 1 3 1 9 3Oligia divesta 1 2 3 1Oligia violacea 1 1 Noctuidae 1Papaipema insulidens 1 2 16 19 Parabagrotis exsertistigma 1 2 3 Parabagrotis formalis 1 1 2Parabagrotis insularis 2 2 3Parabagrotis sulinaris 1 1 2 3Pleromelloida cinerea 1 1 2Protolampra rufipectus 2 2 Protorthodes curtica 1 9 2 1 1 2 1 17 2Xestia cinerascens 1 6 3 10 4 1 25 3Xestia finatimis 1 1 2 Xestia infimatis 2 1 3 2Xestia mustelina 1 2 1 1 2 7 1Xestia smithii 1 1 1Xestia xanthographa 1 1 1Xylomoia germana 1 1 All families Moth too worn to identify 2 10 10 1 7 29 TOTALS --> 39 9 40 67 54 8 4 11 22 54 19 17 26 12 24 407

11 CONCLUSIONS

While this study documented 70 species of macro-moths for Conboy Lake NWR, that number is probably well under 25% of the total moth fauna present there. Unusually dry conditions during 2014 likely suppressed both moth abundance and moth richness. Furthermore, active haying was taking place throughout much of the wet prairie portions of the refuge as moths were being sampled and may have reduced moth activity in those areas.

The large number of distributional records (40) documented from the relatively small effort reported here suggests that further sampling of moths at Conboy Lake would be equally rewarding. At a minimum, a reasonably complete inventory requires a full year of monthly sampling. At best, it requires multiple years of sampling at about two week intervals as many rare species are only documented with great effort.

ACKNOWLEDGEMENTS

I would like to thank regional biologist Joe Engler for taking an interest in moths and for seeking the funds to make this project possible. I would also like to thank Lisa Wilson, assistant refuge manager at Conboy Lake NWR for providing housing on the refuge. I could not have made a number of moth identifications without the access to OSAC provided by collection manager Dr. Christopher Marshall or without the help on difficult moth identifications from Dr. Paul Hammond. Finally, I want to thank the many people who have made the Moth Photographers Group and Pacific Northwest Moth websites the excellent and user friendly resources that they are today.

Photo 6. The Ragwort Stem Borer Moth (Papaipema insulidens).

Cover photo: The White Underwing Moth ( relicta). 12