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Articles 451 - 480 of 506
Full-Text Articles in Biology
Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia Bollinger, Eric Bollinger, Richard Malecki
Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia Bollinger, Eric Bollinger, Richard Malecki
Faculty Research & Creative Activity
We examined three hypotheses concerning hatching asynchrony in the Common Tern (Sterna hirundo). Survival of third-hatching "C-chicks" was significantly lower than that of "A-" and "B-chicks" in broods of three. In 2 yr when conditions did not appear favorable, survival was significantly higher in manipulated broods in which chicks hatched synchronously (73%) than in nonmanipulated broods (56%). Chicks in synchronous broods grew significantly faster than C-chicks and at a rate similar to A- and B-chicks. These results were inconsistent with the brood-reduction hypothesis, which predicts that hatching asynchrony will maximize brood success under conditions of food limitation. Chicks hatching from …
Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia B. Bollinger, Eric K. Bollinger, Richard A. Malecki
Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia B. Bollinger, Eric K. Bollinger, Richard A. Malecki
Faculty Research & Creative Activity
We examined three hypotheses concerning hatching asynchrony in the Common Tern (Sterna hirundo). Survival of third-hatching "C-chicks" was significantly lower than that of "A-" and "B-chicks" in broods of three. In 2 yr when conditions did not appear favorable, survival was significantly higher in manipulated broods in which chicks hatched synchronously (73%) than in nonmanipulated broods (56%). Chicks in synchronous broods grew significantly faster than C-chicks and at a rate similar to A- and B-chicks. These results were inconsistent with the brood-reduction hypothesis, which predicts that hatching asynchrony will maximize brood success under conditions of food limitation. Chicks hatching from …
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon Tucker
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon Tucker
Faculty Research & Creative Activity
No abstract provided.
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
Faculty Research & Creative Activity
No abstract provided.
Morphological Asymmetry And Interspecific Hybridization: A Case Study Using Hylid Frogs, Trip Lamb, James M. Novak, Diane L. Mahoney
Morphological Asymmetry And Interspecific Hybridization: A Case Study Using Hylid Frogs, Trip Lamb, James M. Novak, Diane L. Mahoney
Faculty Research & Creative Activity
The limited studies addressing developmental stability of interspecific hybrids suggest a positive association between the level of fluctuating asymmetry and 1) the degree of divergence between parental species, and 2) the recency of the contact zone. To evaluate these associations, we examined asymmetry in a recentlyestablished hybrid population of treefrogs (Hyla cinerea and H. gratiosa) that show marked structural gene divergence. Fluctuating asymmetry (FA), directional asymmetry, and antisymmetry were assessed for eight paired osteometric traits in allozymically-defined parental and hybrid categories. FA levels varied considerably among traits. Nonetheless, for any given trait, the hybrid categories did not demonstrate elevated levels …
Genotypic And Chemical Influences On Fruit Growth Of Tomato, Henry R. Owen, Louis H. Aung
Genotypic And Chemical Influences On Fruit Growth Of Tomato, Henry R. Owen, Louis H. Aung
Faculty Research & Creative Activity
A relationship between ovary size at anthesis and final fruit diameter of 12 tomato (Lycopersicon esculentum Mill.) cultivars with a range of fruit sizes, shapes, and maturation rates was determined. ‘Fireball’, ‘Michigan/Ohio Hybrid’, and ‘New Yorker’ produced nonfasciated, spherical fruits of intermediate maturation rate and showed a significantly higher correlation between ovary diameter at anthesis and final fruit diameter than ‘Small Fry’, ‘Roma VF’, ‘Early Cascade’, ‘Campbell 1327’, or ‘Ponderosa’. A linear regression of final fruit diameter at maturity on ovary diameter at anthesis of the cultivars was highly significant (r2 = 0.92**; ÿ = 22.5X - 0.3). Continuous root …
Food Quality, Heterozygosity, And Fitness Correlates In Peromyscus Polionotus, James M. Novak, William R. Teska, Michael H.. Smith
Food Quality, Heterozygosity, And Fitness Correlates In Peromyscus Polionotus, James M. Novak, William R. Teska, Michael H.. Smith
Faculty Research & Creative Activity
Oldfield mice (Peromyscus polionotus) that are more heterozygous utilize food and maintain body weight under varying degrees of dietary stress better than their less heterozygous counterparts. Mice were collected in southern Florida and fed diets of three qualities. During each dietary treatment, body weight, amount of food eaten, amount of food absorbed, and feeding efficiency were determined. Body weights for all mice decreased during the experiment. More heterozygous mice maintained their weight better during periods of dietary stress than those that were less heterozygous. Mice with different levels of genetic variability had essentially the same mean feeding efficiency with high …
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric K. Bollinger, Thomas A. Gavin
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric K. Bollinger, Thomas A. Gavin
Faculty Research & Creative Activity
We compared breeding-site fidelity of Bobolinks (Dolichonyx oryzivorus) at two low-quality sites (Bald Hill and Shackelton Point, BH +SP) with that at one high-quality site (Moore Road, MR) in central New York. Yearly density of fledglings at Moore Road was more than six times the density at Bald Hill and Shackelton Point. Furthermore, individual residents fledged 50-70% more young at the high-quality site. At Moore Road, 70% of the males and 49% of the females returned one or more times, compared with 44% of the males and 25% of the females at the low-quality sites. Successful residents (i.e. those fledging …
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric Bollinger, Thomas Gavin
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric Bollinger, Thomas Gavin
Faculty Research & Creative Activity
We compared breeding-site fidelity of Bobolinks (Dolichonyx oryzivorus) at two low-quality sites (Bald Hill and Shackelton Point, BH +SP) with that at one high-quality site (Moore Road, MR) in central New York. Yearly density of fledglings at Moore Road was more than six times the density at Bald Hill and Shackelton Point. Furthermore, individual residents fledged 50-70% more young at the high-quality site. At Moore Road, 70% of the males and 49% of the females returned one or more times, compared with 44% of the males and 25% of the females at the low-quality sites. Successful residents (i.e. those fledging …
The Genera Of Commelinaceae In The Southeastern United States, Gordon C. Tucker
The Genera Of Commelinaceae In The Southeastern United States, Gordon C. Tucker
Faculty Research & Creative Activity
No abstract provided.
Genetic Variability Within And Among Wintering Populations Of Brant, James M. Novak, L. M. Smith, L. D. Vangilder
Genetic Variability Within And Among Wintering Populations Of Brant, James M. Novak, L. M. Smith, L. D. Vangilder
Faculty Research & Creative Activity
No abstract provided.
The Genera Of Commelinaceae In The Southeastern United States, Gordon Tucker
The Genera Of Commelinaceae In The Southeastern United States, Gordon Tucker
Faculty Research & Creative Activity
No abstract provided.
Genetic Distance And Hybridization Of Black Ducks And Mallards: A Morph Of A Different Color?, G. R. Hepp, James M. Novak, K. T. Scribner, P. W. Stangel
Genetic Distance And Hybridization Of Black Ducks And Mallards: A Morph Of A Different Color?, G. R. Hepp, James M. Novak, K. T. Scribner, P. W. Stangel
Faculty Research & Creative Activity
No abstract provided.
The Genera Of Bambusoideae (Gramineae) In The Southeastern United States, Gordon Tucker
The Genera Of Bambusoideae (Gramineae) In The Southeastern United States, Gordon Tucker
Faculty Research & Creative Activity
No abstract provided.
Environmental, Genotypic, And Ploidy Effects On Endopolyploidization Within A Genotype Of Solanum Phureja And Its Derivatives, Henry R. Owen, R. E. Veilleux, D. Levy, D. L. Ochs
Environmental, Genotypic, And Ploidy Effects On Endopolyploidization Within A Genotype Of Solanum Phureja And Its Derivatives, Henry R. Owen, R. E. Veilleux, D. Levy, D. L. Ochs
Faculty Research & Creative Activity
Flow-cytometric analyses of DNA content were performed on chopped in vivo, in vitro, and protoplast-derived in vitro nuclei of Solanum phureja. An anther-derived monoploid genotype and a diploid and tetraploid clone, derived from callus culture of the monoploid genotype, were used to characterize the influence of in vivo and in vitro environment and explant ploidy level on the extent of endopolyploidization. In addition, protoplast-derived nuclei, from nine anther-derived monoploid genotypes, were examined for genotypic influences on endopolyploidization. DNA distributions of the anther-derived monoploid and callus-derived clones in vivo contained peaks corresponding to 1C, 2C, and 4C DNA levels. By comparison, …
Photoperiod Effects On 2n Pollen Production, Response To Anther Culture, And Net Photosynthesis Of A Diplandrous Clone Of Solanum Phureja, Henry R. Owen, R. E. Veilleux, F. L. Haynes, K. G. Haynes
Photoperiod Effects On 2n Pollen Production, Response To Anther Culture, And Net Photosynthesis Of A Diplandrous Clone Of Solanum Phureja, Henry R. Owen, R. E. Veilleux, F. L. Haynes, K. G. Haynes
Faculty Research & Creative Activity
Flow-cytometric analysis of pollen samples obtained from Solanum phureja, clone PP5, grown under 10, 14, and 18 hour photoperiods at the Southeastern Plant Environment Laboratories of North Carolina State University yielded two populations of pollen based on size parameters. These populations corresponded to pollen separation based on propidium iodide staining of DNA. Anther culture response from plants grown under 14 and 18 hour photo periods for 8, I 0, 12, and 14 weeks was greatest from 8 week old plants grown under a 14 hour photoperiod. Net photosynthesis was significantly higher for plants grown under a 10 hour photoperiod than …
Variability For Critical Photoperiod For Tuberization And Tuber Yield Among Monoploid, Anther-Derived Genotypes Of Solanum Phureja, Henry R. Owen, R. E. Veilleux, F. L. Haynes, K. G. Haynes
Variability For Critical Photoperiod For Tuberization And Tuber Yield Among Monoploid, Anther-Derived Genotypes Of Solanum Phureja, Henry R. Owen, R. E. Veilleux, F. L. Haynes, K. G. Haynes
Faculty Research & Creative Activity
Monoploid genotypes (2n = x = 12), derived by anther culture of a diplandrous (2n pollen-producing) clone of Solanum phureja Juz. & Buk., a South American diploid potato species, were examined for their use in germplasm development. Nine monoploid genotypes and the anther-donor genotype were grown in three chambers (10-, 14-, and 18-hr daylengths) to examine the effect of photoperiod on tuber yield and to determine the variability for critical photoperiod for tuberization. Significant differences were found among the monoploid genotypes for tuber weight and tuber number. Longer photoperiod treatments decreased and delayed tuberization. Axillary tuber formation from single-node cuttings …
The Genera Of Bambusoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
The Genera Of Bambusoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
Faculty Research & Creative Activity
No abstract provided.
Habitat Analysis And Foods Of Shrews In East Central Illinois, Lisa D. Blackburn
Habitat Analysis And Foods Of Shrews In East Central Illinois, Lisa D. Blackburn
Masters Theses
No abstract provided.
Additions To The Flora Of Connecticut, Gordon Tucker
Additions To The Flora Of Connecticut, Gordon Tucker
Faculty Research & Creative Activity
Three species of vascular plant are newly recorded for the flora of Connecticut. These are: Linaria dalmatica 1L. (Scrophulariaceae ): Eupatorium album L., and Aster blakei (Porter) House (Compositae).
Additions To The Flora Of Connecticut, Gordon C. Tucker
Additions To The Flora Of Connecticut, Gordon C. Tucker
Faculty Research & Creative Activity
Three species of vascular plant are newly recorded for the flora of Connecticut. These are: Linaria dalmatica 1L. (Scrophulariaceae ): Eupatorium album L., and Aster blakei (Porter) House (Compositae).
The Genera Of Cyperaceae In The Southeastern United States, Gordon C. Tucker
The Genera Of Cyperaceae In The Southeastern United States, Gordon C. Tucker
Faculty Research & Creative Activity
No abstract provided.
The Genera Of Cyperaceae In The Southeastern United States, Gordon Tucker
The Genera Of Cyperaceae In The Southeastern United States, Gordon Tucker
Faculty Research & Creative Activity
No abstract provided.
Diet And Activity Patterns Of The Common Snapping Turtle, Chelydraserpentina, (Lineaus), At Chain O' Lakes State Park, Lake County, Illinois, Jennifer Budhabhatti
Diet And Activity Patterns Of The Common Snapping Turtle, Chelydraserpentina, (Lineaus), At Chain O' Lakes State Park, Lake County, Illinois, Jennifer Budhabhatti
Masters Theses
No abstract provided.
Seasonal And Daily Activity In A Population Of Blanding's Turtle (Emydoidea Blandingi) In Northern Illinois, John W. Rowe
Seasonal And Daily Activity In A Population Of Blanding's Turtle (Emydoidea Blandingi) In Northern Illinois, John W. Rowe
Masters Theses
No abstract provided.
Assessment Of Fawn Breeding In A South Carolina Deer Herd, Olin E. Rhodes Jr., James M. Novak, Michael H. Smith, Paul E. Johns
Assessment Of Fawn Breeding In A South Carolina Deer Herd, Olin E. Rhodes Jr., James M. Novak, Michael H. Smith, Paul E. Johns
Faculty Research & Creative Activity
Annual variation in breeding success among female white-tailed deer (Odocoileus virginianus) fawns on the Savannah River Plant (1967 to 1985) was determined from direct counts of pregnancy in spring-collected fawn females and evidence of lactation and measurements of udder thickness in fall-harvested 1. 5-yearolds. Percent lactation in 1.5-year-old females collected during September and October gave the best estimate of fawn breeding in the previous year. The overall mean fawn breeding estimate from September and October was 41 % , and the yearly variation in fawn breeding was significant. An estimate of the average yearly contribution to recruitment was 43 fetuses …
The Correct Name For Cyperus Cayennensis (C. Flavus), Cyperaceae, Gordon Tucker
The Correct Name For Cyperus Cayennensis (C. Flavus), Cyperaceae, Gordon Tucker
Faculty Research & Creative Activity
No abstract provided.
The Correct Name For Cyperus Cayennensis (C. Flavus), Cyperaceae, Gordon C. Tucker
The Correct Name For Cyperus Cayennensis (C. Flavus), Cyperaceae, Gordon C. Tucker
Faculty Research & Creative Activity
No abstract provided.
New Mesoamerican Species Of Cyperus (Cyperaceae), Gordon C. Tucker
New Mesoamerican Species Of Cyperus (Cyperaceae), Gordon C. Tucker
Faculty Research & Creative Activity
Four species of the genus Cyperus are described, illustrated, and compared to their nearest relatives. These are: C. matudae and C. breedlovei (Subgenus Protocyperus) from the Pacific slope of Chiapas, Mexico; and C. wilburii and C. svensonii (Subgenus Cyperus) from the lowlands of the Isthmus of Tehuantepec, and from the uplands of Chiapas, Guatemala, Honduras, and Nicaragua, respectively.
Plant Breeding For The Home Gardener, Henry R. Owen
Plant Breeding For The Home Gardener, Henry R. Owen
Faculty Research & Creative Activity
No abstract provided.