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Topic: Weedy species

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	Weedy species - Wikipedia, the free encyclopedia
		In ecology, a weedy species is a species that lives in a wide variety of ecologies, including unstable ones and those damaged by humans.
		A 'weedy' animal can subsist on a variety of foods, opportunistically, and has population dynamics that tend to prevent it from depending over-much on abundance.
		Weedy species often overrun the native species of ecoregions they are introduced to.
	en.wikipedia.org /wiki/Weedy_species (173 words)

	Project Title
		In the case of weedy species, one generally needs to apply herbicides prior to them reaching 6 inches in height; otherwise control may not be achieved.
		All weed species were counted on a 10‑m grid, using a 0.58 — m2 quadrate.
		Species were maintained free of other species and hyperspectral data were taken on two week intervals.
	www.asta.msstate.edu /2002/Projects/Pest/02_17.htm (4131 words)

	Report on invasive plant species in American Samoa (Site not responding. Last check: 2007-10-12)
		Species that are invasive elsewhere in similar ecosystems but were not seen on our visit and are not reported in the literature as being present in American Samoa (174 species).
		Species that are invasive or weedy elsewhere and are common or weedy in American Samoa (80 species).
		Species listed in Appendix 2, Table 4 are pests and, although they may not be presently causing serious damage to wildland ecosystems, they are certainly not desirable species.
	www.hear.org /pier/reports/asreport.htm (5713 words)

	Report on invasive species in Micronesia (Site not responding. Last check: 2007-10-12)
		The topic of invasive species is complex and it is difficult to predict the behavior of species introduced into new areas under different combinations of environmental parameters and degrees of disturbance of native plant communities.
		Species that are invasive or weedy elsewhere and are common or weedy in Micronesia (117 species).
		Species listed in Appendix 2, Table 5, even though are native to Micronesia, exhibit characteristics of invasive behavior and should not be introduced where they are not present.
	www.hear.org /Pier/reports/mreport.htm (4118 words)

	Weedy grasses in Iowa
		Iowa has a few native grasses that have weedy growth habits, but the majority of the weedy grasses in Iowa are exotics, grasses that have been introduced from other countries, or, as in the case of fall Panicum (Panicum dichotomiflorum), from another region of the United States.
		Particularly aggressive weeds may be labeled as noxious weeds—these are species that have been designated by legislation as being particularly damaging and needful of control measures.
		In this section, we present a list of the grasses in Iowa that most often fall into the weedy category, a “rogue’s gallery” or photo gallery of the 24 most common or most serious grass weeds in Iowa, and a list of frequently asked questions about grass weeds.
	www.eeob.iastate.edu /research/iowagrasses/weedy.html (535 words)

	GENE FLOW FROM CULTIVATED RICE: ECOLOGICAL CONSEQUENCES
		Thus, studying gene flow from rice to its weedy and wild relatives becomes an important component for the potential ecological risk assessment of GM rice, because gene flow is the primary step from which potential ecological consequences of transgene escape may follow.
		Gene flow from transgenic rice to weedy rice was measured using a transgenic rice variety (Nam29/TR18, as a pollen donor) with herbicide resistance (bar) and 13 accessions of weedy rice collected from Asia and America.
		With current concerns over weed problems caused by wild rice, and particularly the weedy rice in rice farming ecosystems, one of the major fears is whether the transgenes in GM rice varieties will escape to their wild and weedy relatives through gene flow, and enhance the fitness of the wild relatives.
	www.isb.vt.edu /articles/may0402.htm (1619 words)

	THE INSECTS OF CEDAR CREEK
		Carabus maeander is an uncommon species of marshes.
		Species of Bembidion (???species) are common to abundant on mud flats.
		Species of Stenolophus(2 spp) and Agonoderus (2 spp) are fairly common and frequently come to light.
	cedarcreek.umn.edu /insects/024004n.html (706 words)

	End of the Wild: Stephen M. Meyer
		But a large fraction of the non-weedy species will not be fortunate enough to have special programs to extend their survival or will be incapable of responding to such efforts.
		But today only weedy species have the capacity to migrate and reestablish thriving populations in new habitats, which invariably are human-disturbed areas.
		Since we cannot possibly restore relic and ghost species to their former status, nor do we have the knowledge to pick evolutionary winners and losers, we should focus on two core concerns: (1) safeguarding future evolutionary processes and pathways and (2) preserving ecosystem processes and functions.
	bostonreview.net /BR29.2/meyer.html (7718 words)

	The role of the National Genebank of Kenya in the collecting, characterization and conservation of traditional ...
		Among the priority species for action are the leafy vegetables threatened by genetic erosion or required for improvement programmes.
		Some of the wild and weedy species are also used as vegetables, but their major future potential is in fibre improvement programmes.
		The wild/weedy species are found in various parts of the country, along the edges of fields, roadsides and in bushy areas.
	www.ipgri.cgiar.org /publications/HTMLPublications/500/ch11.htm (1960 words)

	Summit Ridge Homeowners' Association - Home Page
		Weedy species tend to increase fuel loads, resulting in hotter and more frequent fires.
		Weedy species crowd out natives, reducing the amount and type of foods available for wildlife (e.g.
		The Mountain is home to 14 species of rare or endangered plant species whose habitat is threatened by encroaching invasive plant species (weeds).
	www.summitridgehoa.com (707 words)

	SDNHM: Botany Department
		That is a staggering number of weedy species when you compare it to other locally diverse groups like birds in the county because the number of weedy plants alone about equals all of the different birds (488) that have ever been reported for San Diego County.
		In this context, a weed is a pioneering species that can obviously disperse well to new locations, establish itself in one of the first stages of plant community succession, and populate the area quickly by either seeds or vegetative means.
		For example, weeds are in direct competition with native plant species for space, water, nutrients, and biological resources such as pollinators and seed dispersers.
	www.sdnhm.org /research/botany/sdweeds.html (1311 words)

	Information Systems for Biotechnology News Report
		This would include weediness characteristics (i.e., degree of aggressiveness), genetic similarity of crop and weed, geographical distribution, ecological requirements, sympatry (degree of genetic interaction among crop and related weed), reproductive biology, pests of wild species, and pest resistance in wild species (i.e., type, frequency, stability).
		The weediness of the crop and its wild relatives, the probability of crop/weed hybridization and transgene introgression, the life spans of the crop and weed, and the persistence of each in the seed bank all influenced the groups' thinking.
		Although most commercially important crops have related weedy species somewhere in the world, not all of these crops are expected to be engineered for pest resistance in the near future.
	www.isb.vt.edu /news/1999/news99.Oct.html (4117 words)

	Alien Invasion - Weedy Species
		But sometimes weedy species help native species; Pigeons who are weedy, are food for Hawks and Falcons, which are native, for example.
		The Brown Tree Snake is responsible for exterminating "10 of 13 native bird species, 6 of 12 native lizard species, and 2 of 3 bat species on the island of Guam (invasivespecies.gov)."
		Different species of birds have been known to reproduce and the aggressive African bee is famous for hybridizing with honey bees.
	www.ecoworld.com /Home/Articles2.cfm?TID=344 (2794 words)

	FINAL RULE: Arabis perstellata (rock cress), Endangered Species, U.S. Fish & Wildlife Service (Site not responding. Last check: 2007-10-12)
		A species being eliminated by processes such as road building or other man-made factors is far different from a species being unable to adapt to a naturally changing environment.
		A species may be determined to be an endangered or threatened species due to one or more of the five factors described in Section 4(a)(1).
		Eight are threatened by weedy competitors, four by weedy competitors and trampling, two by trampling, one by logging, and two by road work (one population was severely impacted by road work during the period the species was proposed for listing).
	www.fws.gov /endangered/r/fr95570.html (4637 words)

	Genetic Diversity in Wild and Weedy Aegilops, Amblyopyrum, and Secale Species--A Preliminary Survey -- Hegde et al. 42 ...
		) for populations of Aegilops, Amblyopyrum, and Secale species.
		UPGMA phenogram based on genetic distances for populations of Aegilops, Amblyopyrum, and Secale species (refer to Table 1 for the population descriptions).
		Genome differentiation in diploid and polyploid Aegilops species.
	crop.scijournals.org /cgi/content/full/42/2/608 (3090 words)

	Seed banks of Carolina bays: Potential contributions from surrounding landscape vegetation.
		Landscape influence was evaluated indirectly by determining whether seed banks in wetlands close to clearcuts had more upland weedy species than those farther from clearcuts.
		DECORANA ordination identified a gradient of species composition from herbaceous bays, to shrubby bays, to forested bays.
		Bays near clearcuts had significantly more upland weedy species in their seed banks, with bays 20 m from clearcuts containing 79% more weedy species on average than bays 100 m from clearcuts.
	www.uga.edu /srel/Reprint/1975.htm (228 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		WEEDY CHARACTERISTIC: Roundleaf greenbriar seeds may be deposited in the landscape by birds or plants may creep in.
		Some species are found in moist rich soils while others thrive on sandy and dry sites.
		Cultivation is effective for rhizomatous species, such as Japanese knotweed and staghorn sumac, but does not control seed-propagated species like maple or poison-ivy.
	www.hort.cornell.edu /department/faculty/weston/weedfacts/wdfct4a.html (1854 words)

	ARS Crop Protection & Quarantine National Program (304)
		Research is needed to define the degree of weed control that specific practices afford, the weed species that are most susceptible, and the conditions that affect efficacy.
		In many instances, these gaps are filled by the same or equally pernicious species, with the end result being a community with as much cover of invasive species as the original, precontrol community.
		A good deal of information is available on the response of weed species to herbicide and mechanical treatments and on some aspects of the basic biology of weedy and desirable species.
	www.ars.usda.gov /research/programs/programs.htm?np_code=304&docid=355&page=20 (3079 words)

	ARS \| Publication request: Allelopathic Effects of Volatile Cineoles on Two Weedy Plant Species
		Publication request: Allelopathic Effects of Volatile Cineoles on Two Weedy Plant Species
		Technical Abstract: The volatile monoterpene analogs, 1,4-cineole and 1,8-cineole, have been identified as minor components of many plant essential oils, but little is known about their biological activities.
		We compared the effects of 1,4- and 1,8-cineole on two weedy plant species by monitoring germination, mitosis, root and shoot growth, chlorophyll content and photosynthetic efficiency.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=102630&pf=1 (219 words)

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