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Articles 181 - 182 of 182
Full-Text Articles in Life Sciences
Genetic Modification Of Host Acceptance By A Seed Beetle: Quasi-Natural Vs. Artificial Selection, Meagan Bridges, Jake Jones, Amberleigh Muller, Frank J. Messina
Genetic Modification Of Host Acceptance By A Seed Beetle: Quasi-Natural Vs. Artificial Selection, Meagan Bridges, Jake Jones, Amberleigh Muller, Frank J. Messina
Biology Posters
Many plant-feeding insects use a fairly well-defined set of hosts, but are occasionally observed on an atypical host. The seed beetle Callosobruchus maculatus infests several grain legumes, especially Vigna spp. It has rarely been reported to attack lentil, a distant relative of its typical hosts (Credland, 1987). In three previous mass-selection experiments, we showed that larval survival in lentil increased rapidly after a bottleneck, from 70% in only 5-7 generations. Host shifts by insects may also require modification of egg-laying behavior. Initial assays confirmed that most C. maculatus females fail to recognize lentil as a potential host. We used both …
Pattern Of Genetic Recovery In Daphnia Populations Following Experimental Removal Of Fish, Jaewook Chung, Leigh C. Latta, Iv, Michael E. Pfrender
Pattern Of Genetic Recovery In Daphnia Populations Following Experimental Removal Of Fish, Jaewook Chung, Leigh C. Latta, Iv, Michael E. Pfrender
Biology Posters
The establishment and maintenance of high levels of genetic diversity is an important consideration for populations that have experienced recent demographic collapse. Populations that have undergone demographic contraction or have been recently established generally lack standing adaptive variation. The level of adaptive genetic variation is a key determinant of population persistence, especially in changing environments, since dramatic changes in environmental conditions or community composition may impose severe or novel selective pressures. We obtained data for nuclear markers and conducted a common-garden experiment to assess the current levels of molecular genetic variation. Our results suggest that in the approximately eight years …