Now showing items 92-111 of 131

    • Phenotypic variation in a zooplankton egg bank 

      Hairston, Nelson G., Jr.; Kearns, Colleen M.; Ellner, Stephen P. (Ecological Society of America, 1996-12)
      Dormant propagule pools may store potentially significant genetic variation that can influence the rate and direction of microevolution via directional selection, tem- porally fluctuating selection, and evolution of trait ...
    • Photoprotection by carotenoid pigments in the copepod Diaptomus nevadensis 

      Hairston, Nelson G., Jr. (National Academy of Sciences, 1976-03)
      Individuals of the copepod Diaptomus nevadensis that contain high concentrations of carotenoids survive significantly better in natural intensities of visible light than less pigmented copepods. Vertical migration and ...
    • Phylogenetic and Experimental Tests of Interactions among Mutualistic Plant Defense Traits in Viburnum (Adoxaceae) 

      Weber, Marjorie G.; Clement, Wendy L.; Donoghue, Michael J.; Agrawal, Anurag A. (University of Chicago Press, 2012-10)
      Plant traits that mediate mutualistic interactions are widespread, yet few studies have linked their macroevolutionary patterns with the ecological interactions they mediate. Here we merged phylogenetic and experimental ...
    • Phylogenetic escalation and decline of plant defense strategies 

      Agrawal, Anurag A.; Fishbein, Mark (National Academy of Sciences, 2008-07-22)
      As the basal resource in most food webs, plants have evolved myriad strategies to battle consumption by herbivores. Over the past 50 years, plant defense theories have been formulated to explain the remarkable variation ...
    • Phylogeny of the plant genus Pachypodium (Apocynaceae) 

      Burge, Dylan O.; Mugford, Kaila; Hastings, Amy P.; Agrawal, Anurag A. (PeerJ, 2013-04-23)
      Background. The genus Pachypodium contains 21 species of succulent, generally spinescent shrubs and trees found in southern Africa and Madagascar. Pachypodium has diversified mostly into arid and semi-arid habitats of ...
    • Plant chemical defense indirectly mediates aphid performance via interactions with tending ants 

      Zust, Tobias; Agrawal, Anurag A. (Ecological Society of America, 2017-01-06)
      The benefits of mutualistic interactions are often highly context dependent. We studied the interaction between the milkweed aphid Aphis asclepiadis and a tending ant, Formica podzolica. Although this interaction is generally ...
    • Plant genotype and environment interact to shape a diverse arthropod community on evening primrose (Oenothera biennis) 

      Johnson, Mark T.; Agrawal, Anurag A. (Ecological Society of America, 2005-04-01)
      Both an individual's genotype and environment govern its phenotype, and this phenotype may have extended consequences for species interactions and communities. We examined the importance of plant genotype and environmental ...
    • Plant Genotype Shapes Ant-Aphid Interactions: Implications for Community Structure and Indirect Plant Defense 

      Mooney, Kailen A.; Agrawal, Anurag A. (University of Chicago Press, 2008-04-15)
      Little is known about the mechanisms by which plant genotype shapes arthropod community structure. In a field experiment, we measured the effects of milkweed (Asclepias syriaca) genotype and ants on milkweed arthropods. ...
    • Playing Hide-and-Seek in Beta-Globin Genes: Gene Conversion Transferring a Beneficial Mutation between Differentially Expressed Gene Duplicates 

      Strážnická, Michaela; Marková, Silvia; Searle, J. B.; Kotlík, Petr (Multidisciplinary Digital Publishing Institute (MDPI), 2018-10-12)
      Increasing evidence suggests that adaptation to diverse environments often involves selection on existing variation rather than new mutations. A previous study identified a nonsynonymous single nucleotide polymorphism (SNP) ...
    • Prey evolution on the time scale of predator-prey dynamics revealed by allele-specific quantitative PCR 

      Meyer, J. R.; Ellner, S. P.; Hairston, Nelson G., Jr.; Jones, L. E.; Yoshida, T. (National Academy of Sciences, 2006-07-11)
      Using rotifer-algal microcosms, we tracked rapid evolution resulting from temporally changing natural selection in ecological predator-prey dynamics. We previously demonstrated that predator-prey oscillations in rotifer-algal ...
    • R2d2 Drives Selfish Sweeps in the House Mouse 

      Didion, John P.; Morgan, Andrew P.; Yadgary, Liran; Bell, Timothy A.; McMullan, Rachel C.; Ortiz de Solorzano, Lydia; Britton-Davidian, Janice; Bult, Carol J.; Campbell, Karl J.; Castiglia, Riccardo; Ching, Yung-Hao; Chunco, Amanda J.; Crowley, James J.; Chesler, Elissa J.; Förster, Daniel W.; French, John E.; Gabriel, Sofia I.; Gatti, Daniel M.; Garland, Theodore; Giagia-Athanasopoulou, Eva B.; Giménez, Mabel D.; Grize, Sofia A.; Gündüz, ?slam; Holmes, Andrew; Hauffe, Heidi C.; Herman, Jeremy S.; Holt, James M.; Hua, Kunjie; Jolley, Wesley J.; Lindholm, Anna K.; López-Fuster, María J.; Mitsainas, George; da Luz Mathias, Maria; McMillan, Leonard; da Graça Morgado Ramalhinho, Maria; Rehermann, Barbara; Rosshart, Stephan P.; Searle, J. B.; Shiao, Meng-Shin; Solano, Emanuela; Svenson, Karen L.; Thomas-Laemont, Patricia; Threadgill, David W.; Ventura, Jacint; Weinstock, George M.; Pomp, Daniel; Churchill, Gary A.; Pardo-Manuel de Villena, Fernando (Oxford University Press on behalf of the Society for Molecular Biology and Evolution, 2016-02-15)
      A selective sweep is the result of strong positive selection driving newly occurring or standing genetic variants to fixation, and can dramatically alter the pattern and distribution of allelic diversity in a population. ...
    • Rapid evolution of a life-history trait 

      Hairston, Nelson G., Jr.; Walton, W. E. (National Academy of Sciences, 1986-07)
      The copepod Diaptomus sanguineus begins diapause in permanent ponds in late March as an adaptation to avoid summer fish predation. During a study of copepod populations in two Rhode Island ponds, a severe drought dried one ...
    • Reconstructing Asian faunal introductions to eastern Africa from multi-proxy biomolecular and archaeological datasets 

      Prendergast, M.E.; Buckley, M.; Crowther, A.; Eager, H.; Frantz, L.; Lebrasseur, O.; Hutterer, R.; Hulme-Beaman, A.; Van Neer, W.; Douka, K.; Veall, M.-A.; Quintana Morales, E.M.; Schuenemann, V.J.; Reiter, E.; Allen, R.; Helm, R.; Shipton, C.; Mwebi, O.; Denys, C.; Horton, M.; Wynne-Jones, S.; Fleisher, J.; Radimilahy, C.; Wright, H.; Searle, J.B.; Krause, J.; Larson, G.; Boivin, N.L. (Public Library of Science, 2017-08)
      Human-mediated biological exchange has had global social and ecological impacts. In sub-Saharan Africa, several domestic and commensal animals were introduced from Asia in the pre-modern period; however, the timing and ...
    • Relatedness predicts phenotypic plasticity in plants better than weediness 

      Cook-Patton, Susan C.; Agrawal, Anurag A. (Evolutionary Ecology, 2011)
      Background: Weedy non-native species have long been predicted to be more phenotypically plastic than native species. Question: Are weedy non-native species more plastic than natives? Organisms: Fourteen perennial plant ...
    • Relative Selectivity of Plant Cardenolides for Na+/K+-ATPases From the Monarch Butterfly and Non-resistant Insects 

      Petschenka, G.; Fei, C. S.; Araya, J. J.; Schröder, S.; Timmermann, B. N.; Agrawal, Anurag A. (Frontiers Media, 2018-09-28)
      A major prediction of coevolutionary theory is that plants may target particular herbivores with secondary compounds that are selectively defensive. The highly specialized monarch butterfly (Danaus plexippus) copes well ...
    • Resistance and susceptibility of milkweed: competition, root herbivory, and plant genetic variation 

      Agrawal, Anurag A. (Ecological Society of America, 2004-08-01)
      Beetles in the genus Tetraopes share a long evolutionary history with milkweeds (Asclepias spp.), feeding on roots as larvae and leaves as adults. Despite their extreme specialization on milkweed, Tetraopes require drying ...
    • Riverine nitrogen export from the continents to the coasts 

      Boyer, E. W.; Howarth, R. W.; Galloway, J.; Dentener, F. J.; Green, P. A.; Vorosmarty, C. A. (Wiley, 2006-03-02)
      We present an overview of riverine nitrogen flux calculations that were prepared for the International Nitrogen Initiative's current global assessment of nitrogen cycles: past, present, and future (Galloway et al., 2004). ...
    • Role of overlapping generations in maintaining genetic variation in a fluctuating environment 

      Ellner, Stephen; Hairston, Nelson G., Jr. (University of Chicago, 1994-03)
      Population genetics theory suggests that temporally fluctuating selection on pheno- types can act to maintain genetic variance only under very restrictive conditions. However, this conclusion is based on models with discrete ...
    • Salicylate-mediated interactions between pathogens and herbivores 

      Thaler, Jennifer S.; Agrawal, Anurag A.; Halitschke, Rayko (Ecological Society of America, 2010-01-01)
      Plants employ hormone?mediated signaling pathways to defend against pathogens and insects. We tested predictions about the relative effect of jasmonate and salicylate pathways and how they mediate interactions between ...
    • Shifts in plant–microbe interactions over community succession and their effects on plant resistance to herbivores 

      Howard, Mia; Kao-Kniffin, Jenny; Kessler, Andre (New Phytologist, 2020)
      Soil microorganisms can influence the development of complex plant phenotypes, including resistance to herbivores. This microbiome-mediated plasticity may be particularly important for plant species that persist in ...