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SECTION A. ZOOLOGY SATURDAY, APRIL 28, 1984 MORNING SESSION MORLEY 205 E. BRUCE MCLEAN, PRESIDING VALIDITY AND RELIABILITY OF SELECTED OHIO CHRISTMAS BIRD COUNTS: 196O-1982. Victor W. Fazio and John F. Wing, Departments of Biology and Psychology, Witten- berg University, Springfield, Ohio 45501. Data from eighteen long-standing and consistently-manned Ohio stations were normal- ized (Raynor, 1975) for the bobwhite (Colinus yirginianus), two buteos (Buteo ,ja- maicensis and B. lineatis) and a kestrel (Falco sparverius).These species were chosen be- cause they were l) resident, 2) sedentary, 3) terrestrial, 1*) non-gregarious, 5) non-elusive, 6) spatio-temporally consistent in distribution, and 7) numerous (i.e., large sample sizes). Counts per 100 party-hours correlated .83 - .99 (p < .001) with counts per 1,000 party-miles. However, the former gave higher correlations between species, and hence it forms the basis for the rest of this report. The bobwhite showed a significant decline over the two decades (F=38.U, p < .001). In contrast, the kestrel showed significant increase (F=2l*.6, p < .001), and the buteos showed a similar increase, but it was non-significant (F=l*.8, n.s.). The kestrel and buteos correlated .62 ( p < .001), but each was negatively correlated with the bobwhite (-.0U and -.36, respectively) due to the latter's opposing downward trend. However, intercorrelation of residuals around trend lines showed the bobwhite fluctuations were aligned with both the buteos (.58, p <.00l) and the kestrel (.71, p <.00l). These findings are compared with a number of studies (e.g., Freedman and Riley, 1980), and it is concluded that careful use of CBC's provides valid and reliable data. CORRELATION OF SELECTED OHIO CHRISTMAS BIRD COUNTS WITH METEOROLOGICAL VARIAELES: 196O-1982. John F. Wing, Victor W. Fazio, and Eric P. Johnston, Departments of 9.15 Psychology and Biology, Wittenberg University, Springfield, Ohio 1*5501. Normalized counts for the bobwhite (Colinus virginianus), two buteos (Buteo ja- maicensis and B.lineatis) and a kestrel(Falco sparverius) were correlated with precipitation, snowfall and winter severity (heating degree days) as taken from Ruffner and Bair (1982). A number of statistically significant and meaningful relationships were ob- tained. In general, the party-hours and party-miles measures yielded comparable correlations. Using the party-hours measure, precipitation correlated .33 (p < .10) for the buteo, and .1*0 (p < .05) for the kestrel counts. The bobwhite count correlated negatively because of its general decline; however, its residuals correlated .1*1 (p < .05). The correlation of pre- cipitation with buteo residuals was .25 (n.s.) and with kestrel residuals was .36 (p < .06). Correlations with snowfall were all negative and many were near significance. Correlations with winter severity were also negative, and the correlations with residuals were significant at lag 3 for the bobwhite (-.37, p < .05) and kestrel (-.1+7, p < .05) and at lag 2 for the kestrel (-.53, p < .01), suggesting that winter severity may have affected breeding success and survival of juveniles. Correlations of winter severity with both counts and residuals also were negative at zero lag, but they were non-significant. Finally, the bobwhite showed a correlation of .1+1+ (p < .01) with a measure of solar variation. INFLUENCE OF COLOR AND POSTURE ON THE ENERGETICSOF THE AMERICAN GOLDFINCH. [Carduelis tristis] S.D. Dannemiller Ohio State Dept. of Zoology 1735 Neil Ave. 9 ; 30 Columbus, Ohio 432l0 Taxidermic models of male and female goldfinches were used to determine the interaction of wind and solar radiation on the energy exchange of birds in summer plumage. The interplay of color and postural adjustment was examined under varying meteorological conditions, and it appears that by postural adjustment goldfinches can negate differences in energy exchange due to color. This interplay allows the bird to maintain thermal balance and maximize energetic efficiency. HOST-PARASITE RELATIONSHIPS OF LARVAL TANAORHAMPHUS LONGIROSTRIS (ACANTHOCEPHALA: NEOECHINORHYNCHIDAE) IN THE INTERMEDIATE HOST, DIAPTOMUS PALLIDUS HERRICK (1879) 9./15 (CRUSTACEA: COPEPODA). Barbara A. Wilson and Jerry H. Hubschman, Dept. of Biological Sciences, Wright State University, Dayton, Ohio 45435 The limnetic calanoid copepod, Diaptomus pal1idus, has recently been reported to serve as an intermediate host for larval stages of the acanthocephalan, Tanaorham- phus longirostris. Host-parasite relationships were examined to determine (1) the prevalence and intensity of the parasite in the D. pal 1 i dus population sampled from Caesar Creek Lake, Ohio in 1981; (2) differences in infection between sexes of copepods; and (3) size and position of T. longirostris relative to its intermediate host, D. pallidus. Approximately 12,800 adult copepods were examined from a June 27, 1981 collection. A total of 620 (b,8%) adult copepods contained the cystacanth stage of T. longirostris. Prevalence decreased to 1*5% on July 18, 1981. No statistical difference in susceptibility to infection between sexes of adult copepods could be demonstrated. Cystacanth orientation within the hemocoel of the copepod was examined. Based on 604 single infections, 400 (66.2%) were directed anteriorly and 204 (33°8%) were found facing posteriorly within the copepod, A significant difference in cystacanth orientation from the expected 50:50 distribution (X - 63,6, P< 0,001) was determined by a chi-square test. No statistical difference was found between the mean length of infected and uninfected adult male or adult female copepods. The mean length of cystacanths found in adult male and adult female copepods was 608 urn ± 51,9 and 693 urn ± 63,3, respectively. There was a significant difference in the mean length between cystacanths found in adult male and adult female copepods. ULTRASTRUCTURE OF THE CLAMP GENERATING REGION OF MICROCOTYLE SPINICIRRUS MACCALLUM, 1918 (MONOGENEA: MICROCOTYLIDAE). John C. Mergo Jr., and John L. Crites, Department of Zoology, The Ohio State University, Columbus, Ohio, 43210 Ultrastructural examination of the clamp generating area of Microcotyle spinicirrus reveals a large region of undifferentiated cells containing large elongate nuclei. Within this region, immature clamps in various stages of development were observed. Clamp development begins with the infolding of the epidermis resulting in a clamp lumen entirely lined with tegument. As the clamp matures, the main supporting rods of the mature clamp, the sclerites, begin to form. Enlargement of the sclerites occurs by the fusion of proteinacious granules to the immature sclerites. After sclerite formation has begun, myofibers organize into discrete bundles, a distinct basement membrane becomes evident around the entire clamp wall, and regions of muscular attachment to the basement membrane of the clamp wall are formed. ASCARIS SUUM 2-METHYLBUTYRYL CoA DEHYDROGENASE: PURIFICATION AND POSSIBLE RELATIONSHIP TO BRANCHED-CHAIN FATTY ACID SYNTHESIS. Steven A. Fekete, 10:15 Dept. of Biology, University of Toledo, Toledo, Ohio, 43606. Ascaris suum accumulates the branched-chain fatty acids, 2-methylbutyrate (2-MB) and 2-methylvalerate (2-MV) as end products of its carbohydrate metabolism. The terminal reaction in the formation of 2-MB, the NADH-dependent reduction of 2-methylcrotonyl CoA, requires both mitochondrial membrane-bound and soluble components (Komuniecki, et al., 1981, J. Parasitol. 67:841). In the present study, the terminal, soluble, 2-methylcrotonyl reductase was assayed by monitoring 2-MB CoA dehydrogenase activity using Medolablau and INT as electron acceptors. The enzyme was purified to apparent homogeneity by (NH4)2SO4 precipitation and chromatography on DEAE-cellulose and hydroxylapatite. It contains FAD and has a subunit molecular weight of about 42,000, as judged by SDS-polyacrylamide gel electrophoresis. Activity was unaffected by 2mM N-ethylmaleimide and dependent on 2-MB CoA. Butyryl CoA, valeryl CoA, isovaleryl CoA and octanoyl CoA were inactive as substrates in the assay system. Incubation of the purified enzyme with freshly isolated mitochondrial membranes, NADH and 2-methylcrotonyl CoA resulted in small amounts of 2-MB formation. However, the inclusion of FAD in the incubation medium increased 2-MB formation 3-5 fold. The possible role of electron-transfer flavoprotein in NADH-dependent 2-methylcrotonyl CoA reduction remains to be determined. Supported in part by NIH grant AI 18427. SECTION A. ZOOLOGY SATURDAY, APRIL 28, 1984 AFTERNOON SESSION MORELY 205 DAVID F. YOUNG, PRESIDING 1:30 SECTION BUSINESS MEETING A COMPARATIVE STUDY OF GROSS AND MICROSCOPIC STRUCTURE OF THE CAECAE AND THE INTESTINE OF BLUEGILL FISH - LEPOMIS MACROCHIRUS (Teleostei). Amjad Hossain 2:00 and Hiran M. Dutta. Department of Biological Sciences, Kent State University, Kent, OH 44242. Considerable difference exists in the gross as well as microscopic structures be- tween the caecae and the intestine of the bluegill fish. These differences are evident in the mucosal folds of the caecae which are more complex and extensively ramified in comparison to the intestine. The longitudinal muscular layer is relatively thicker in caecae compared to the intestine. Unlike caecae, there is regional variation in the thickness of the muscular layers (longitudinal and circular) all along the length of the intestinal wall. Further, compared to the intestine, the distribution of goblet cells is much lower in the caecae. Unlike the intes- tine,