Digital Commons Network^™

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 …

Herbivory Alters Resource Allocation And Compensation In The Invasive Tree Melaleuca Quinquenervia, P. D. Pratt, M. B. Rayamajhi, T. K. Van, T. D. Center, P. W. Tipping

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The Australian native Melaleuca quinquenervia is highly invasive in the Florida Everglades, U.S.A., where it experiences limited competition or herbivory from native species, making it a likely candidate for compensation. The introduced biological control agent Oxyops vitiosa feeds exclusively on the seasonal flushes of developing foliage at branch apices, which represents ~ 15% of the total foliar biomass.

Cooperation And Coordination Are Invasive Species: Important For Effective Management Of Invasive Weeds, U.S. Government Accountability Office

All U.S. Government Documents (Utah Regional Depository)

Invasive weeds, native or nonnative plant species, cause harm to natural areas such as rangelands or wildlife habitat and economic impacts due to lost productivity of these areas. While the federal investment in combating invasive species is substantial most has been concentrated on agricultural lands, not on natural areas. In this report, GAO describes (1) the entities that address invasive weeds in natural areas and the funding sources they use; (2) federal, state, and local weed management officials’ views on the barriers to weed management; and (3) their opinions about how additional resources for weed management could be distributed. GAO …

Phylogenetic Investigations Of The Genus Cyprinella Based On Mitochondrial Dna Sequence Data, Tiffani Crum

Electronic Theses and Dissertations

The genus Cyprinella is a highly diverse and widely distributed assemblage of freshwater fish. Members of this genus are commonly referred to as minnows and their similar appearances have led to numerous classification problems. Only recently has Cyprinella been elevated to generic status and many relationships within the genus are only beginning to be understood. To investigate the monophyly of Cyprinella leedsi, a species of Cyprinella with a highly disjunct distribution, and to develop a molecular method for tracking hybridization events between the invasive red shiner (C. lutrensis) and other southeastern Cyprinella species, the mtDNA tRNA Pro gene, the control …

Five-Year Review Of Executive Order 13112 On Invasive Species, The National Invasive Species Council (Nisc)

All U.S. Government Documents (Utah Regional Depository)

No abstract provided.

Soil Feedback And Pathogen Activity In Prunus Serotina Throughout Its Native Range, Kurt O. Reinhart, Alejandro A. Royo, Wim H. Van Der Putten, Keith Clay

USDA Forest Service / UNL Faculty Publications

1. Oomycete soil pathogens are known to have a negative effect on Prunus serotina seedling establishment and to promote tree diversity in a deciduous forest in Indiana, USA. Here, we investigate whether negative feedbacks operate widely in its native range in eastern USA.

2. In laboratory experiments, soil sterilization was used to test the net effect of soil biota (pathogens and mutualists) and fungicide treatments to test the effects of soil pathogens (oomycetes) on survival of P. serotina seedlings in soils from 22 P. serotina populations throughout the eastern USA.

3. In soil associated with P. serotina trees, there was …

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 …