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129640 NWS 84 1 Final.Indd Blake R. Hossack1, U.S. Geological Survey, 790 East Beckwith Avenue, Missoula, Montana 59801 Robert L. Newell, Flathead Lake Biological Station, University of Montana, 32125 Bio Station Lane, Polson, Montana 59860 and D. Christopher Rogers, EcoAnalysts, Inc., P.O. Box 4098, Davis, California 95616 Branchiopods (Anostraca, Notostraca) from Protected Areas of Western Montana Introduction Study Area and Methods Fairy shrimp (order Anostraca) and tadpole shrimp Wetlands in Glacier NP have been surveyed for (order Notostraca), members of the crustacean amphibians since 1999 as part of a long-term class Branchiopoda, are important components of monitoring and research program by the U.S. many freshwater and saline wetlands (Dodson and Geological Survey (Corn et al. 2005). Glacier Frey 2001, Brendonk et al. 2008). These animals NP is a 4082 km2 reserve that forms part of the are especially common in seasonal wetlands, Glacier-Waterton International Peace Park along where populations are maintained by banks of the U.S.–Canada border. Elevations range from resting eggs that may remain dormant for decades approximately 950 m to 3190 m. Much of the park or longer (Brendonck 1996). Both orders are is characterized by U-shaped valleys that reflect distributed worldwide (Brendonk et al. 2008). Pleistocene glaciation (Carrara 1989). West of the Fairy shrimp are more prone to endemism, with Continental Divide, the park is dominated by a several species listed as threatened or endangered, moist Pacific maritime climate. East of the Divide, and new species are described frequently (e.g., continental-polar air masses result in a colder, Rogers 2006, Rogers et al. 2006). Most of the drier climate (Carrara 1989). Topographic and comparatively few species of tadpole shrimp are climatic variation in the park produce a variety of widespread, but Lepidurus packardi is endemic habitats, ranging from western red cedar (Thuja to central California and the recently-described plicata)–western hemlock (Tsuga hetrophylla) L. cryptus is restricted to the Pacific Northwest forests typical of the Pacific Northwest to alpine (Rogers 2001). tundra and grasslands. We report fairy shrimp and tadpole shrimp Local wildlife refuges, including the National collected during surveys for amphibians on Depart- Bison Range and Lost Trail National Wildlife ment of the Interior lands in western Montana from Refuge (NWR), have also been inventoried peri- 2001 to 2008, primarily in Glacier National Park odically for amphibians since 2001. The National (NP). Glacier NP has an extensive history of lim- Bison Range (elevation range: 788 to 1489 m) is nological research, but wetland invertebrates have composed of Palouse Prairie grasslands and moun- not been well documented (Newell and Hossack tane forest. Lost Trail NWR (elevation 1064 m to 2009). Although much of western North America 1403 m) is in an intermountain valley surrounded has been surveyed for branchiopod crustaceans, by public and private forest that is managed for most effort in Montana has focused on the Great timber production. The valley bottom is covered Plains in the eastern portion of the state. We also with prairie grasses and weeds and has extensive provide an updated account of fairy shrimp and tadpole shrimp collected from Montana. wetlands. Most of the wetlands have been cre- ated or altered in support of previous livestock operations on the property, but there are several 1Author to whom correspondence should be addressed. natural wetlands on the west side of the refuge E-mail: [email protected] that are ephemeral. 52 Northwest Science, Vol. 84, No. 1, 2010 Between mid-May and mid-August each year, Results and Discussion we sampled a variety of wetlands ranging from We collected 4 species of fairy shrimp (3 in temporary marshes and pools to large cirque lakes. Glacier NP) from 57 wetlands and 1 species of Most wetlands surveyed in Glacier NP were tem- tadpole shrimp from 16 wetlands (Figure 1). All porary marshes surrounded by dense forest. With a specimens were collected from valley-bottom few exceptions, most water bodies had near-neutral or hillside water bodies. Fairy shrimp are com- pH and specific conductance < 300 μS/cm. Surveys mon in some high elevation (including alpine) were timed to coincide with the approximate 6–8 ponds elsewhere in the Rocky Mountains (e.g., wk period when amphibian larvae were expected Anderson 1974, Saunders et al. 1993, Bohonak to be present and free-swimming. Crews searched and Whiteman 1999). We have not found fairy shallow areas (~ 0.5 m) of each site, using a dip shrimp in high-elevation habitats in Glacier NP, net (3.2 mm mesh) to sweep through vegetation but we have received reports of a high-elevation and to capture amphibian larvae. Because our field population near Snyder Lake. efforts were directed towards amphibians rather than crustaceans, we only sampled water bodies We made the most collections of fairy shrimp that were likely to have water long enough to sup- in 2002 and 2008. The larger number of records in port amphibian metamorphosis. By excluding the 2008 partially reflects sampling effort and a greater most ephemeral water bodies, we did not sample emphasis on preserving specimens; however, a many habitats that would have been suitable for similar effort in 2007 resulted in fewer observa- branchiopods. tions. For example, we sampled one wetland near Lake McDonald at about the same time (late May/ Our collections were mostly opportunistic and early June) every year since 1999, and fairy shrimp do not reflect the full extent of any species docu- were present in some years (e.g., 2002 and 2008) mented. The presence of fairy shrimp, especially, and not others. We suspect inconsistent detection was frequently recorded by field technicians in of fairy shrimp is due largely to variation in the Glacier NP during the early years of the study timing of hatching: the resting eggs hatch later in without collecting specimens. Since 2001, when years with late snowmelt. we first found tadpole shrimp in Glacier NP, crews were instructed to collect tadpole shrimp We never found fairy shrimp at Lost Trail NWR whenever they were detected. Similarly, crews or tadpole shrimp at the National Bison Range. were instructed to collect fairy shrimp from all Although co-occurrence within and between orders water bodies (374 surveyed) where they were is common elsewhere (Dodson and Frey 2001), detected in 2007 and 2008. All specimens were we found co-occurrence by two species of fairy fixed in 10% formalin or 95% ethanol and identi- shrimp and by a fairy shrimp and tadpole shrimp fied at the University of Montana Flathead Lake in only one wetland. Both cases of co-occurrence Biological Station using standard taxonomic keys were near Lake Sherburne on the east side of the (Belk 2000, Rogers 2001, Rogers 2002). Species park. In Glacier NP, we found all three species of identifications were verified at EcoAnalysts, Inc. fairy shrimp only in the lower Lee Ridge area, in in Davis, California. the northeast corner of the park where the Great Plains transition into montane forests. Supplementary Records Coordinates for all wetlands where we collected specimens identifiable to species are provided in To provide an updated recorded for Montana, Appendix 1. In addition to species collected during we also include location records for 13 species this study, 10 other species of fairy shrimp from of fairy shrimp and 4 species of tadpole shrimp 5 genera and 3 species of tadpole shrimp from 2 from personal collections and records of D. C. genera have been documented in Montana. Rogers. For accuracy, units and place names are presented as they were recorded originally. Col- Order Anostraca (Sars, 1867) lection abbreviations are as follows: DCR = D. Christopher Rogers personal collections; DB = Branchinecta paludosa (Müller, 1788)—We col- Denton Belk collection (now at the U.S. Natural lected Branchinecta paludosa from one pond in History Museum); U.S.N.M. = U.S. Natural His- each of three drainages (Cutbank Creek, Lake tory Museum. Sherburne, Lee Creek) on the east side of the Montana Branchiopoda 53 Figure 1. Locations where we collected three species of fairy shrimp and one species of tadpole shrimp (Lepidurus couesii) in Glacier National Park (GNP). The X-marks indicate all sites surveyed in 2007–2008, when branchiopods were collected whenever they were found. Many other collections were opportunistic. Detailed collection locations are not shown for Lost Trail National Wildlife Refuge (LTNWR) and the National Bison Range (NBR) because only one species was found on each refuge. The black line bisecting the park and the state is the Continental Divide. park (Figure 1). All ponds were in mid-elevation we collected B. readingi, specific conductance (1708–1900 m), mixed deciduous–conifer forests. exceeded the limits of our meter (1990 μS/cm) Branchinecta paludosa is primarily a circumpolar and pH was 9.2. This species typically inhabits arctic species, but in North America its distribution very alkaline waters (Belk 2000). extends southward along the Rocky Mountains Branchinecta readingi was recently separated (Saunders et al. 1993, Maynard Stern and Belk from B. mackini based on distinct morphology of 1999). This shrimp occupies a wide variety of males (Belk 2000). Both B. mackini and B. readingi habitats, including alpine ponds >3000 m elevation are widely distributed in western North America, in Wyoming (Saunders et al. 1993), and has been although neither had been collected in Montana collected previously near Glacier NP (Lynch 1958) before. Belk (2000) noted that B. readingi had and from just north of our study sites in Waterton only been collected east of the Continental Divide Lakes NP, Canada (Anderson 1974). elsewhere in North America, whereas B. mackini Branchinecta readingi (Belk, 2000)—We col- had only been found west of the Divide. Aside lected Branchinecta readingi from a single pool from the first record from Montana, our record in the Ravalli Potholes on the National Bison is significant because the National Bison Range Range in 2002.
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