Shannon L. Farrell

Experienced males have higher mating success than virgin males despite fitness costs to females

It is generally assumed that mating history has potentially important effects on the mating biology of insects, and differences in mating success of males, in relation to their mating history, have been commonly documented in Lepidoptera. Mating success of male European corn borer Ostrinia nubilalis, in relation to their mating history, and consequent fitness parameters for their female mates, were investigated. Mating experience significantly increased mating success for O. nubilalis males. Mating with experienced males significantly reduced lifetime fecundity and longevity of females. Sperm depletion, transfer of less nutritive substances or more toxic substances may explain the female response to mating with experienced males. Male persistence or some other compensatory mechanism may account for female acceptance of experienced males.

Planting Patterns of In-Field Refuges Observed for Bt Maize in Minnesota

ABSTRACT The U.S. Environmental Protection Agency (USEPA) requires the use of nontransgenic refuges to slow the evolution of insect resistance to transgenic crops. In-field refuges, or refuges that are planted within the same field as the transgenic crop, are allowed; however, these refuges are required to be at least four rows wide. We described in-field planting patterns used by growers for both Cry1Ab [against Ostrinia nubilalis (Hübner)] and Cry3Bb (against Diabrotica virgifera virgifera LeConte) maize, Zea mays L. Maize fields known to contain Cry1Ab, Cry3Bb, or both were sampled in southwestern Minnesota during late June and early September 2005. Rows were sampled to describe the pattern of in-field refuges in the entire field, Most in-field refuges contained >20% Cry- seed (79% of Cry1Ab and 84% of Cry3Bb). However, only 5% of Cry1Ab fields and 2% of Cry3Bb fields with in-field refuges were in compliance with USEPA requirements because the Cry- seed was not in wide enough strips or blocks. Most growers had planted their fields with either finely mixed refuges or with strips that were too narrow. There was a high diversity in planting patterns, and the occurrence of Cryseed was in random rows. Growers may have been rushed while planting and not noticed which seed was going into which rows, Resistance failures have not been documented for either O. nubilalis or D. virgifera virgifera, so better education programs will need to be undertaken to encourage growers to plant in-field refuges properly.

The Types, Frequencies, and Findability of Disciplinary Grey Literature within Prominent Subject Databases and Academic Institutional Repositories

INTRODUCTION In many disciplines grey literature, or works that are more ephemeral in nature and are not typically published through traditional scholarly channels, are heavily used alongside traditional materials and sources. We were interested in the type and frequency of grey literature in subject databases and in North American institutional repositories (IRs) as well as what disciplines use grey literature. METHODS Over 100 subject databases utilized by academic researchers and the IRs of over 100 academic institutions were studied. Document type, search capabilities, and level of curation were noted. RESULTS Grey literature was present in the majority (68%) of the literature databases and almost all IRs (95%) contained grey literature. DISCUSSION Grey literature was present in the subject databases across all broad disciplines including arts and humanities. In these resources the most common types of grey literature were conference papers, technical reports, and theses and dissertations. The findability of the grey literature in IRs varied widely as did evidence of active collection development. CONCLUSION Recommendations include the development of consistent metadata standards for grey literature to enhance searching within individual resources as well as supporting future interoperability. An increased level of collection development of grey literature in institutional repositories would facilitate preservation and increase the findability and reach of grey literature.

Highly variable male courtship behavioral sequences in a crambid moth

Research on male courtship behavior of moths has focused on documenting stereotyped sequences for successful copulation. We characterized successful male courtship behavior among 126 virgin mating pairs of Ostrinia nubilalis. Using Markov analysis, stereotypy indices, and a novel application of ecological network analysis, we found high variability in these sequences. Fifteen courtship behaviors were described and 96 behavioral transitions were observed, 39 of which occurred only once. The number of courtship bouts ranged from one to ten, the number of behavioral transitions ranged from four to 41, and the number of copulation attempts ranged from one to 29. Only 23% of males used a common, simple behavioral sequence. Females exhibited acceptance or rejection behaviors in 40% of the sequences, but these did not explain the high variability in male courtship sequences. About half of the transitions occurred non-randomly, and stereotypy was low. Network analysis revealed that the courtship sequences started and ended with stereotyped behaviors and the high variability occurred in the middle of the sequences. Whole system analysis showed that the courtship sequences were more variable than for optimal transfer of information. Overall, these results suggest that the sequence of behaviors may be less important than the occurrence of certain behavioral elements for successful mating.