The Heard Lab

Understanding ecological controls on the evolution of biodiversity









· Heard, S.B., G.A. Schultz, C.B. Ogden, and T.C. Griesel. 1999. Mechanical abrasion and organic matter processing in an Iowa stream. Hydrobiologia 400:179-186 (pdf).

· Pewe, L., S.B. Heard, C. Bergmann, M.O. Dailey, and S. Perlman. 1999. Selection of CTL escape mutants in mice infected with a neurotropic coronavirus: quantitative estimates of TCR diversity in the infected central nervous system.  J. Immunol. 163:6106-6113 (pdf).

· Molano-Flores, B., S.D. Hendrix, and S.B. Heard. 1999. The effect of population size on stigma pollen load, fruit set, and seed set in Allium stellatum Ker. (Liliaceae). Int. J. Plant Sci. 160:753-757 (pdf).

· Heard, S.B., M.A. Campbell, M.L. Bonine, and S.D. Hendrix. 1999. Developmental instability in fragmented populations of prairie phlox (Phlox pilosa L.): a cautionary tale. Conserv. Biol. 13:274-281 (pdf).

· Weld, J.D., C.M. Rogers, and S.B. Heard. 1999. Semester-long field investigations in undergraduate Animal Behavior and Ecology. J. College Sci. Teach 28:340-344 (pdf).

· Remer, L.C. and S.B. Heard. 1998. Local movement and edge effects on competition and coexistence in ephemeral-patch models. Amer. Nat. 152:896-904 (pdf).

· Heard, S.B. and C.K. Buchanan. 1998. Larval performance and association with and between species of hackberry nipple gall insects, Pachypsylla spp. (Homoptera: Psyllidae). Amer. Midl. Nat. 140:351-357 (pdf).

· Heard, S.B. 1998.  Capture rates of invertebrate prey by the pitcher plant, Sarracenia purpurea L. Amer. Midl. Nat. 139:79-89 (pdf).

· Heard, S.B. 1998. Resource patch density and larval aggregation in mushroom-breeding flies. Oikos 81:187- 195 (pdf).

· Heard, S.B. and L.C. Remer. 1997. Clutch size behavior and coexistence in ephemeral-patch competition models. Amer. Nat. 150:744-770 (pdf).

· Mooers, A.O. and S.B. Heard. 1997. Inferring evolutionary process from phylogenetic tree shape. Q. Rev. Biol. 72:31-54 (pdf).

· Heard, S.B. and Mooers, A. 1996. Imperfect information and the balance of cladograms and phenograms. Syst. Biol. 45:115-118 (pdf).

· Heard, S.B. 1996. Patterns in phylogenetic tree balance with variable and evolving speciation rates. Evolution 50:2141-2148 (pdf).

· Semple, J.C., S.B. Heard, and C. Xiang. 1996. The Asters of Ontario (Compositae: Asteraceae): Diplactis Raf., Oclemena E.L. Greene, Doellingeria Nees, and Aster L. (including Canadanthus Nesom, Symphyotrichum Nees, and Virgulus Raf.). University of Waterloo Biology Series 38:1-94.

· Heard, S.B. and D.L. Hauser. 1995. Key evolutionary innovations and their ecological mechanisms. Hist. Biol. 10:151-173 (pdf).

· Heard, S.B. and Richardson, J.S. 1995. Shredder-collector facilitation in stream detrital food webs: is there enough evidence? Oikos 72:359-366 (pdf).

· Heard, S.B. 1995. Short-term dynamics of processing chain systems. Ecol. Model. 80:57-68 (pdf).

· Heard, S.B. 1994. Processing chain ecology: resource condition and interspecific interactions. J. Anim. Ecol. 63:451-464 (pdf).

· Heard, S.B. 1994. Pitcher plant midges and mosquitoes: a processing chain commensalism. Ecology 75:1647-1660 (pdf).

· Heard, S.B. 1994. Imperfect oviposition decisions by the pitcher plant mosquito, Wyeomyia smithii. Evol. Ecol. 8: 493-502 (pdf).

· Heard, S.B. 1994. Wind exposure and the distribution of the pitcher-plant mosquito, Wyeomyia smithii. Environ. Entomol. 23:1250-1253 (pdf).

· Heard, S.B. 1992. Patterns in tree balance among cladistic, phenetic, and randomly generated phylogenetic trees. Evolution 46:1818-1826 (pdf).

· Casper, B.B., S.B. Heard, and V. Apanius. 1992. Ecological correlates of single-seededness in a tropical woody flora. Oecologia 90:212-217 (pdf).

· Krantz, A., R.A. Smith, L.J. Copp, P.J. Coles, and S.B. Heard. 1991. Peptidyl acyloxymethyl ketones and the quiescent affinity label concept: the departing group as a variable structural element in the design of inactivators of cysteine proteinases. Biochemistry 30:4678-4687 (pdf).

· Heard, S.B. and J.C. Semple. 1988. The Solidago rigida complex (Compositae: Astereae): a morphometric analysis and chromosome numbers. Can. J. Bot. 66:1800-1807 (pdf).

· Smith, R.A., L.J. Copp, P.J. Coles, H.W. Pauls, V.J. Robinson, R.W. Spencer, S.B. Heard, and A. Krantz. 1988. New inhibitors of cysteine proteinases: peptidyl acyloxymethyl ketones and the quiescent nucleofuge strategy. J. Amer. Chem. Soc. 110:4429-4431 (pdf).

· Semple, J.C. and S.B. Heard. 1987. The asters of Ontario: Aster L. and Virgulus Raf. (Compositae: Astereae). University of Waterloo Biology Series 30:1-88.


And strictly for fun:


· Heard, S.B. 1991. The centrifugal theory of species diversity. Bull. Ecol. Soc. Amer. 72(1):13 (pdf).

Plant images © Geoff Galicio, Pethan, Randy Nonenmacher, Elke Love