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Full-Text Articles in Life Sciences
Priority Resource Access Mediates Competitive Intensity Between An Invasive Weevil And Native Floral Herbivores, Svata M. Louda, Tatyana A. Rand, A. A. R. Kula, A. E. Arnett, N. M. West, Brigitte Tenhumberg
Priority Resource Access Mediates Competitive Intensity Between An Invasive Weevil And Native Floral Herbivores, Svata M. Louda, Tatyana A. Rand, A. A. R. Kula, A. E. Arnett, N. M. West, Brigitte Tenhumberg
School of Biological Sciences: Faculty Publications
Mechanisms underlying invasive species impacts remain incompletely understood. We tested the hypothesis that priority resource access by an invasive biocontrol weevil, Rhinocyllus conicus, intensifies and alters the outcome of competition with native floral herbivores over flower head resources of the non-target, native host plant Cirsium canescens, specifically with the predominant, synchronous tephritid fly Paracantha culta. Four main results emerged. First, we documented strong, asymmetric competition, with R. conicus out-competing P. culta. Second, weevil priority access to floral resources accelerated competitive suppression of P. culta. Evidence for competitive suppression with increased weevil priority included decreases in both the numbers and …
Vulnerability Of Rehabilitated Agricultural Production Systems To Invasion By Nontarget Plant Species, Sara G. Baer, David M. Engle, Johannes M.H. Knops, Kenneth A. Langeland, Bruce D. Maxwell, Fabian D. Menalled, Amy J. Symstad
Vulnerability Of Rehabilitated Agricultural Production Systems To Invasion By Nontarget Plant Species, Sara G. Baer, David M. Engle, Johannes M.H. Knops, Kenneth A. Langeland, Bruce D. Maxwell, Fabian D. Menalled, Amy J. Symstad
School of Biological Sciences: Faculty Publications
Vast areas of arable land have been retired from crop production and ‘‘rehabilitated’’ to improved system states through landowner incentive programs in the United States (e.g., Conservation and Wetland Reserve Programs), as well as Europe (i.e., Agri-Environment Schemes). Our review of studies conducted on invasion of rehabilitated agricultural production systems by nontarget species elucidates several factors that may increase the vulnerability of these systems to invasion. These systems often exist in highly fragmented and agriculturally dominated landscapes, where propagule sources of target species for colonization may be limited, and are established under conditions where legacies of past disturbance persist and …
A Nontechnical Introduction To "Biocontrol As Usual": Review Of Ann Hajek, Natural Enemies, Svata M. Louda
A Nontechnical Introduction To "Biocontrol As Usual": Review Of Ann Hajek, Natural Enemies, Svata M. Louda
School of Biological Sciences: Faculty Publications
Increasing recognition of the problems posed by invasive, exotic species has led to a recent upsurge of interest in the potential of biological control as a sustainable management strategy. The idea that ‘‘natural control’’ could be re-established on a species in its new environment is a seductive one, nurtured by a small set of impressive success stories and the belief in a simple solution (‘‘silver bullet’’). Yet, recent serendipitous discoveries also make it clear that attempts to engineer the outcome of species interactions in new systems can lead to undesired direct and indirect effects of unanticipated magnitude on non-targeted native …
Indirect Interaction Between Two Native Thistles Mediated By An Invasive Exotic Floral Herbivore, F. Leland Russell, Svata M. Louda
Indirect Interaction Between Two Native Thistles Mediated By An Invasive Exotic Floral Herbivore, F. Leland Russell, Svata M. Louda
School of Biological Sciences: Faculty Publications
Spatial and temporal variation in insect floral herbivory is common and often important. Yet, the determinants of such variation remain incompletely understood. Using 12 years of flowering data and 4 years of biweekly insect counts, we evaluated four hypotheses to explain variation in damage by the Eurasian flower head weevil, Rhinocyllus conicus, to the native North American wavyleaf thistle, Cirsium undulatum. The four factors hypothesized to influence weevil impact were variations in climate, weevil abundance, phenological synchrony, and number of flower heads available, either on wavyleaf thistle or on the other co-occurring, acquired native host plant (Platte thistle, Cirsium …