Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Robert S. Fritz"'
Publikováno v:
Oecologia. 97(1)
We studied the morphology, molecular genetics, and hebivory of two species of willows (Salix sericea and S. eriocephala) and their interspecific hybrids to test four alternative hypotheses concerning the effects of hybridization on plant resistance.
Autor:
Mary Ellen Czesak, Colin M. Orians, Benedicte R. Albrectsen, Robert S. Fritz, Cris G. Hochwender
Publikováno v:
Annals of Botany
Background and Aims Selective feeding by herbivores, especially at the seedling or juvenile phase, has the potential to change plant traits and ultimately the susceptibility of surviving plants to other enemies. Moreover, since hybridization is impor
Publikováno v:
American Malacological Bulletin. 30:309-314
In the northern Santa Rita Mountains, Pima County, Arizona, there are three named species of the helminthoglyptid landsnail Sonorella Pilsbry, 1900: Sonorella magdalenensis (Stearns, 1890), S. walkeri walkeri Pilsbry and Ferris, 1915, and S. rosemont
Publikováno v:
Oecologia. 163:283-290
Many studies have failed to detect costs of defense and some have even found a positive correlation between growth and the concentrations of chemical defenses. These studies contradict the theoretical assump- tion that anti-herbivore defenses are cos
Autor:
Robert S. Fritz, Rebecca R. Smyth, Cris G. Hochwender, Elizabeth M. Bosecker, Rachel E. Tucker, Arlen D. Kaufman, Dong H. Cha
Publikováno v:
Agricultural and Forest Entomology. 11:175-184
Selection can favour herbivores that choose host plants benefitting their offspring either by enhancing growth rates or by increasing larval defences against native predators. For exotic predator species that feed on herbivores, their success with in
Publikováno v:
Evolution. 60:1215-1227
Models of hybrid zone dynamics incorporate different patterns of hybrid fitness relative to parental species fitness. An important but understudied source of variation underlying these fitness differences is the environment. We investigated the perfo
Publikováno v:
Ecological Entomology. 30:170-175
Using three genetic classes of willows, Salix eriocephala, Salix sericea, and their interspecific F1 hybrid, the influence of browsing damage and the importance of genetic class on insect community structure were evaluated. 2. Three-year-old plants g
Publikováno v:
Oikos. 105:268-278
Slugs, willow seedlings and nutrient fertilization: intrinsic vigor inversely affects palatability
Publikováno v:
Oikos. 102:601-613
We performed an experiment on preference and performance of the leaf galling sawfly, Phyllocolpa leavitti (Hymenoptera: Tenthredinidae), to test predictions of the plant vigor hypothesis, the sex-biased herbivory hypothesis, and the enemy-free space
Publikováno v:
Biochemical Systematics and Ecology. 31:233-247
Investigators often examine the factors—genetic or environmental—that determine the concentrations of secondary chemicals and growth, but few have examined both simultaneously. We used a factorial genetic design and manipulated nutrient availabil