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In Moose, Alces Alces, from Alaska and Wyoming1 Proc. Helminthol. Soc. Wash. 52(1), 1985, pp. 54-59 Redescription of Trypanosoma cervi (Protozoa) in Moose, Alces alces, from Alaska and Wyoming1 N. KINGSTON,2 ALBERT FRANZMANN,S AND LEROY MAKi2 2 Division of Microbiology and Veterinary Medicine, College of Agriculture, University of Wyoming, Laramie, Wyoming 82071 and 3 State of Alaska Department of Fish and Game, Box 3150, Soldatna, Alaska 99669 ABSTRACT: Trypanosoma cervi Kingston and Morton, 1975 is redescribed from 38 bloodstream trypomastigotes concentrated from the blood of a single Alaskan moose, Alces alces gigas, in 1981. These trypanosomes were compared with trypanosomes from moose in Wyoming, A. a. shiras, and with trypanosomes from elk, mule deer, white-tailed deer, and reindeer. Statistical analysis confirmed the conspecificity of cervid trypanosomes. Unidentified trypanosomes were first re- This was chilled until examination. Part of the sample covered from cervids by Kistner and Hanson was centrifuged in microhematocrit tubes and the plas- ma buffy-coat interface was examined by brightfield (1969). These were found in white-tailed deer microscopy (DE, single concentration, using a 3.5-16 x (Odocoileus virginianus) from the southeastern objective and a 12.5 x ocular) for active trypanosomes. United States. Trypanosomes subsequently have When trypanosomes were observed, the tube was scored been reported from this host (Stuht, 1975; Kings- just above the buffy-coat and some plasma, the try- ton and Crum, 1977; Davidson et al., 1983) as panosomes, the buffy-coat, and some red cells were expressed onto a microscope slide by pushing on the well as from elk (Cervus canadensis) in Wyo- hematocrit tube sealant with a stylet. The expressed ming, Michigan, and New Mexico (Kingston and material was mixed on the slide and conventional thin Morton, 1973; Davies and Clark, 1974; Stuht, blood films were prepared. Thirty-eight slides were 1975), mule deer (O. hemionus) (Clark, 1972; made, air-dried, fixed with absolute methanol, stained Kingston et al., 1975; Matthews et al., 1977), with Giemsa's stain, and decolorized in cold running tap water. Slides were coated with a thin film of im- and reindeer (Rangifer tarandus) (Kingston et al., mersion oil and the blood film completely scanned 1982). Morphometric analyses of bloodstream (16x objective, 12.5x ocular) for trypanosomes. When trypomastigotes from these hosts have demon- observed, trypanosomes were photographed with color strated (Kingston and Morton, 1975; Kingston transparency film under the oil immersion objective with a 10 x ocular substituting for the lens of a Zeiss and Crum, 1977; Matthews et al., 1977; Kings- SLR camera mounted on the microscope. Thirty-eight ton et al., 1982) conspecificity of these parasites trypanosomes were adequate for further study. The and that they are Trypanosoma cervi Kingston transparencies were projected and images drawn at a and Morton, 1975. Although we have collected standard distance. A transparency of a stage microm- blood samples from moose (Alces alces shirasi), eter at the same magnification was projected on the drawing and the scale was indicated. The drawings whenever possible (Kingston et al., 1981), and a were measured using a calibrated map wheel reader few bloodstream trypomastigotes have been ob- (Alvin, 1112, Switzerland). The mensural parameters served, an adequate comparison with trypano- of the trypanosomes derived from these measurements somes from other hosts has not been possible. were analyzed using a computerized single analysis of variance (Statistical Package for the Social Sciences Blood collected from an Alaskan moose, Alces [SPSS], version 8). These were compared with men- alces gigas, provided sufficient numbers of sural values of trypanosomes from other cervid species bloodstream trypomastigotes to allow compari- similarly analyzed. son with those from moose in Wyoming and from other cervids in North America. Results Fourteen captive, and/or free-ranging moose Materials and Methods from Wyoming have been examined for try- About 10 ml of jugular blood from an anesthetized panosomes since 1977. Of these, two calves and moose was drawn into a heparinzed vacutainer tube. eight adults, including both sexes, were positive for trypanosomes, either by culture (veal infusion medium, VIM) or by direct examination (DE) of concentrated blood (Kingston et al., 1981). Four 1 Published with the approval of the Director, Ag- riculture Experiment Station Paper No. JA 1275, Col- trypomastigotes were recovered on slides from lege of Agriculture, University of Wyoming, Laramie. such infected blood examined DE. Trypano- 54 Copyright © 2011, The Helminthological Society of Washington Table 1. Comparison of means of mensural values* between Wyoming moose and Alaska moose trypanosomes and trypanosomes from other deer.f x PKt KN PN NA BL FF L W FF:BL NI KI Wyoming moose (N=4) 7.5 ± 0.96§ 7.0 ±0 14.5 ± 0.96 15.2 ± 1.03 30.3 ± 1.7 8.3 ± 0.75 38.5 ± 1.85 2.8 ± 0.25 1:3.8 ± 0.36 0.9 ± 0.06 1:2.1+0.14 Alaska moose (#=38) 16.7 ±0.85 7.5 + 0.28 24.0 ± 0.93 30.4 ± 0.99 54.5 ± 1.54 9.8 ± 0.59 64.0 ± 1.56 7.0 ± 0.50 1:6.5 ± 0.50 0.8 ± 0.37 1:3.3 ± 0.14 Composite: Wyoming moose + Alaska moose (#=42) 15.8 ± 0.86 7.5 ± 0.26 23.1 + 0.95 29.0 ± 1.13 52.2 ± 1.78 9.6 ± 0.54 61.6 ± 1.84 6.6 ± 0.49 1:6.2 ± 0.47 0.8 ± 0.35 1:3.2 ± 0.14 Other deerf: Copyright © 2011, The Helminthological Copyright © 2011, The Helminthological Society of Washingto Composite(# = 132) 10.2 ± 0.42 6.9 ± 0.19 17.1 ± 0.50 21.5 ± 0.55 38.8 ± 0.95 7.7 ± 0.29 46.4 ± 1.05 5.1 ± 0.18 1:6.1 ± 0.35 1:0.8 ± 0.02 1:2.6 ± 0.08 Composite grand mean (#=174) 11.5 ±0.43 7.0 + 0.16 18.5 ± 0.48 23.3 + 0.55 42.0 ± 0.94 8.2 ± 0.26 50.1 + 1.03 5.5 + 0.19 1:6.1 ± 0.29 0.8 ± 0.2 1:2.7 ± 0.07 * Expressed in pm. t Other deer include values from elk, mule deer, white-tailed deer, and reindeer. t Abbreviations: PK = posterior end to kinetoplast, KN = kinetoplast to nucleus, PN = posterior end to nucleus, NA = nucleus to anterior end, BL = body length, FF = free flagellum, L = length, W = width, FF:BL = free flagellum to body length ratio, NI = PN/NA, KI = PN/KN. § Standard error. n 56 PROCEEDINGS OF THE HELMINTHOLOGICAL SOCIETY Figures 1, 2. Small trypanosomes recovered from the blood of moose from Wyoming (x BL = 30 pm). Figures 3, 5. Large bloodstream trypomastigotes from moose from Alaska (x BL = 54 pm). Figure 4. Small trypomas- tigote from blood of moose from Alaska. Copyright © 2011, The Helminthological Society of Washington OF WASHINGTON, VOLUME 52, NUMBER 1, JANUARY 1985 57 somes were not observed in two adult moose Differences in absolute measurements ob- from Utah. One captive yearling male moose served for trypanosomes from Alaskan moose from the Kenai Moose Research Center, on the compared with absolute measurements of other Kenai National Moose Refuge, Soldatna, Alaska T. cervi trypanosomes (PN, AN, BL, and L) are was positive for trypanosomes on DE. Forty-two all functions of body size. It therefore seems un- trypanosomes were found on 38 slides. The men- reasonable to separate the moose trypanosomes sural values of the four trypanosomes from Wy- from the other cervid trypanosomes based on, oming moose and of the 38 usable trypanosomes essentially, that single criterion. We conclude from the Alaska moose are presented in Table therefore that the trypanosomes from moose are 1. Both the small forms from Wyoming moose conspecific with Trypanosoma cervi Kingston and (Figs. 1, 2) in which the body length (BL) exclu- Morton, 1975 described from elk in Wyoming sive of the flagellum averaged 30 /im, or larger (Kingston and Morton, 1975). This species is forms (Figs. 3-5) from Alaskan moose (BL x = also known from mule deer (Matthews et al., 54 fim) are typical Megatrypanum trypano- 1977), white-tailed deer (Kingston and Crum, somes. All specimens have (1) a centrally to 1977), and reindeer (Kingston et al., 1982) in slightly posteriorly located nucleus, (2) a long North America. pointed "tail," and (3) the short free flagellum characteristic of other cervid trypanosomes. Duncan's Multiple Range Test for similarities of Discussion the means (P < 0.05) of mensural values of try- Examination and comparison of the mensural panosomes from different hosts, viz., Alaska data derived from measurements of trypano- moose, moose, elk, mule deer, white-tailed deer, somes from moose in Wyoming and Alaska (Ta- and reindeer indicated that for: (1) posterior end ble 1) may suggest to some that these are widely to kinetoplast (PK) values, trypanosomes from divergent forms and, possibly, different species Alaskan moose differ only from trypanosomes owing to the apparent great disparity in body size recovered from mule deer; (2) kinetoplast to nu- and position of various organelles. We argue that cleus (KN) distances, trypanosomes from Alas- these differences in mensural values are more kan moose differ significantly only from try- apparent than real. The small numbers of spec- panosomes found in mule deer; (3) distances from imens (four) from Wyoming moose constitute an posterior end to nucleus (PN), trypanosomes from inadequate sample for comparison. Moreover, Alaskan moose differ significantly from trypano- samples of trypanosomes from Wyoming moose somes from all species except white-tailed deer; were taken at seasons of the year when small (4) distances from nucleus to anterior end (NA), forms predominate, causing them to resemble trypanosomes from Alaskan moose significantly chronic (winter) forms in many respects (see mule differ from those found in all other host species; deer, Fig.
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