![Exotic plant invasions to the mediterranean region of Chile: causes](http://s1.studyres.com/store/data/017176504_1-4b3ff87d2451e0d49b261560dae1fa81-300x300.png)
Exotic plant invasions to the mediterranean region of Chile: causes
... introductions are unprecedented in history, and they are far from being under control (Williamson 1996). The existing evidence suggests that greater changes in global diversity can be expected if species introductions are not controlled, especially in the species-rich mediterranean-type regions of t ...
... introductions are unprecedented in history, and they are far from being under control (Williamson 1996). The existing evidence suggests that greater changes in global diversity can be expected if species introductions are not controlled, especially in the species-rich mediterranean-type regions of t ...
Evolutionary relatedness does not predict competition and co
... interactions, such as habitat use, the types of resources consumed and potential shared predators. As such, he argued that closely related species should be the least likely to coexist. This idea is now commonly called the competition-relatedness hypothesis (CRH) [1], which is sometimes extended to ...
... interactions, such as habitat use, the types of resources consumed and potential shared predators. As such, he argued that closely related species should be the least likely to coexist. This idea is now commonly called the competition-relatedness hypothesis (CRH) [1], which is sometimes extended to ...
View/Open - Oregon State University
... biotic interactions including the spread of invasive species have led to global and local declines ...
... biotic interactions including the spread of invasive species have led to global and local declines ...
neinvasives.com
... Brownish yellow to white in color; colonies or mats of didymo look like sewage sludge or wet tissue paper. It appears slimy, but to the ...
... Brownish yellow to white in color; colonies or mats of didymo look like sewage sludge or wet tissue paper. It appears slimy, but to the ...
conclusions from phytoplankton surveys
... on Padisák, Reynolds and Sommer (1993). The nature and origin of disturbance In his original paper, Connell (1978) considered disturbances primarily originating from internal processes (e.g., treefall gaps caused by the death of senescent trees). However, there is no a priori reason why disturbances ...
... on Padisák, Reynolds and Sommer (1993). The nature and origin of disturbance In his original paper, Connell (1978) considered disturbances primarily originating from internal processes (e.g., treefall gaps caused by the death of senescent trees). However, there is no a priori reason why disturbances ...
Species loss and the structure and functioning of multitrophic
... (1991b), means from nine insect dominated aquatic food webs; b) Martinez (1991, 1991a) single large lake food web; c) Hall and Raffaelli (1991, 1991a) single large estuarine food web; d) Havens (1992), pelagic food webs from fifty lakes; e) Closs and Lake (1994) stream food webs for different season ...
... (1991b), means from nine insect dominated aquatic food webs; b) Martinez (1991, 1991a) single large lake food web; c) Hall and Raffaelli (1991, 1991a) single large estuarine food web; d) Havens (1992), pelagic food webs from fifty lakes; e) Closs and Lake (1994) stream food webs for different season ...
Flowering Patterns in a Seasonal Tropical Lowland Forest in
... de Investigaciones sobre Desertificación-CIDE- (CSIC/UV/GV), Apartado Oficial 46470 Albal, Valencia, Spain ...
... de Investigaciones sobre Desertificación-CIDE- (CSIC/UV/GV), Apartado Oficial 46470 Albal, Valencia, Spain ...
Interspecific information transfer influences animal community
... mixed-species groups that persist regardless of the temporary distribution of threats or resources (Figure 1c). Such groups are found in birds [34], fish [35], insects [31], and mammals [36]. Mixed-taxa groups can be found as well, such as groups of hornbills and mongooses in Africa [37]. Such stabl ...
... mixed-species groups that persist regardless of the temporary distribution of threats or resources (Figure 1c). Such groups are found in birds [34], fish [35], insects [31], and mammals [36]. Mixed-taxa groups can be found as well, such as groups of hornbills and mongooses in Africa [37]. Such stabl ...
Opposite relationships between invasibility and native species
... larger variety of plant species. Therefore, as heterogeneity increases, species richness of both native and exotic plants would be expected to increase (Huston and DeAngelis 1994). As heterogeneity and species richness increase, the maximum number of individuals of any one species would decrease. In ...
... larger variety of plant species. Therefore, as heterogeneity increases, species richness of both native and exotic plants would be expected to increase (Huston and DeAngelis 1994). As heterogeneity and species richness increase, the maximum number of individuals of any one species would decrease. In ...
Shrubs as ecosystem engineers in a coastal dune: influences on
... characteristics of resident plant species in the system, including those of the shrubs themselves. Although very little work has been done in this area, considerable insight will be gained by exploring the degree to which multiple shrub species in the same system – that differ markedly in ecological ...
... characteristics of resident plant species in the system, including those of the shrubs themselves. Although very little work has been done in this area, considerable insight will be gained by exploring the degree to which multiple shrub species in the same system – that differ markedly in ecological ...
Assessing ecological specialization of an ant–seed dispersal
... nature of ants. These three particularities, together with the fact that dispersal-related rewards of myrmecophilous plants do not require, in general, any ant preadaptation or fine adjustment, determine the low specificity of ant–plant mutualisms. Within ant–plant interactions, myrmecochory (seed dis ...
... nature of ants. These three particularities, together with the fact that dispersal-related rewards of myrmecophilous plants do not require, in general, any ant preadaptation or fine adjustment, determine the low specificity of ant–plant mutualisms. Within ant–plant interactions, myrmecochory (seed dis ...
Dynamics of ecological communities in variable environments
... The environment that affects the population dynamics of species is naturally variable and unpredictable. Usually there is a wide spectrum of environmental variables that can change both temporally and spatially, such as climatic factors (Ruokolainen et al. 2009). Variation in the environment can aff ...
... The environment that affects the population dynamics of species is naturally variable and unpredictable. Usually there is a wide spectrum of environmental variables that can change both temporally and spatially, such as climatic factors (Ruokolainen et al. 2009). Variation in the environment can aff ...
Oviposition preference and life history traits in cactophilic Drosophila
... the agar surface and then sterilized with 50% clorox for 3 min (Starmer and Gilbert, 1982). For each species, two egg-collecting chambers were set up. Three batches of 100 eggs were placed on sterile agar and allowed to hatch in order to obtain estimates of egg-hatchability in D. buzzatii and D. koe ...
... the agar surface and then sterilized with 50% clorox for 3 min (Starmer and Gilbert, 1982). For each species, two egg-collecting chambers were set up. Three batches of 100 eggs were placed on sterile agar and allowed to hatch in order to obtain estimates of egg-hatchability in D. buzzatii and D. koe ...
Herpetofauna Biodiversity on Marine Corps Installations
... Amphibians and reptiles (herpetofauna) account for a considerable portion of contemporary biodiversity and approximately 17,153 species have been described (AmphibiaWeb, 2012; Uetz, 1995a). Approximately one new species of reptile or amphibian is discovered by the scientific community every week. He ...
... Amphibians and reptiles (herpetofauna) account for a considerable portion of contemporary biodiversity and approximately 17,153 species have been described (AmphibiaWeb, 2012; Uetz, 1995a). Approximately one new species of reptile or amphibian is discovered by the scientific community every week. He ...
Sink habitats can alter ecological outcomes for competing species
... return to the source habitat (B. Kotler, personal communication). While ideal free populations in which individuals move freely to maximize their per-capita fitness do not occupy sink habitats under equilibrium conditions (Holt 1985), they may occupy sink habitats under non-equilibrium conditions (H ...
... return to the source habitat (B. Kotler, personal communication). While ideal free populations in which individuals move freely to maximize their per-capita fitness do not occupy sink habitats under equilibrium conditions (Holt 1985), they may occupy sink habitats under non-equilibrium conditions (H ...
Towards a mechanistic understanding of fish species niche
... target species are not necessarily causally linked. For example, elevation may be an informative predictor of a species’ distribution, but it is only indirectly linked to population dynamics through a correlation with temperature that directly affects individual performance. Inconsistent correlation ...
... target species are not necessarily causally linked. For example, elevation may be an informative predictor of a species’ distribution, but it is only indirectly linked to population dynamics through a correlation with temperature that directly affects individual performance. Inconsistent correlation ...
Study Guide for Final
... understand the significance of these to demographers. Be able to use age structure diagrams to predict future size of a population. 10. Understand geometric growth curves. Understand and be able to explain exponential and logistic growth curves and the factors that affect each. Understand and be ab ...
... understand the significance of these to demographers. Be able to use age structure diagrams to predict future size of a population. 10. Understand geometric growth curves. Understand and be able to explain exponential and logistic growth curves and the factors that affect each. Understand and be ab ...
Observed Instances of Speciation
... There is an abundance of asexual populations that this definition just doesn't apply to (Budd and Mishler 1990). Examples of taxa which are obligately asexual include bdelloid rotifers, euglenoid flagellates, some members of the Oocystaceae (coccoid green algae), chloromonad flagellates and some ara ...
... There is an abundance of asexual populations that this definition just doesn't apply to (Budd and Mishler 1990). Examples of taxa which are obligately asexual include bdelloid rotifers, euglenoid flagellates, some members of the Oocystaceae (coccoid green algae), chloromonad flagellates and some ara ...
Landscape modification and habitat fragmentation: a
... Samways, 1996). Although various pattern-oriented approaches differ in their assumptions, all are based on human-defined land cover (often native vegetation), and seek to establish correlations with species or groups of species to infer potential ecological causalities (Fig. 3). The main limitation ...
... Samways, 1996). Although various pattern-oriented approaches differ in their assumptions, all are based on human-defined land cover (often native vegetation), and seek to establish correlations with species or groups of species to infer potential ecological causalities (Fig. 3). The main limitation ...
Butterflys - Moreton Bay Regional Council
... coiled tube used for sucking up water, nectar and other plant juices. The membranous wings are covered on both surfaces with overlapping scales, and are strengthened by veins which also brace them – much like battens do a sail. ...
... coiled tube used for sucking up water, nectar and other plant juices. The membranous wings are covered on both surfaces with overlapping scales, and are strengthened by veins which also brace them – much like battens do a sail. ...
Node-by-node disassembly of a mutualistic interaction web driven
... sites with, than in sites without exotic ungulates, and because the mistletoe is the primary source of nectar for the hummingbird during the austral winter, the density of hummingbirds should also be lower at invaded sites than at intact sites. In fact, the density of hummingbirds in the winter decl ...
... sites with, than in sites without exotic ungulates, and because the mistletoe is the primary source of nectar for the hummingbird during the austral winter, the density of hummingbirds should also be lower at invaded sites than at intact sites. In fact, the density of hummingbirds in the winter decl ...
Common Name: COOSAWATTEE CRAYFISH Scientific Name
... time, they are free of the mother, but stay close and will hold on to her for some time. Eventually they move off on their own. Crayfishes molt 6 or 7 times during their first year of life and most are probably able to reproduce by the end of that year. They molt once or twice a year for the remaind ...
... time, they are free of the mother, but stay close and will hold on to her for some time. Eventually they move off on their own. Crayfishes molt 6 or 7 times during their first year of life and most are probably able to reproduce by the end of that year. They molt once or twice a year for the remaind ...
1 BILLING CODE 3510-22-P DEPARTMENT OF
... In assessing extinction risk of this species, we considered the demographic viability factors developed by McElhany et al. (2000) and the risk matrix approach developed by Wainwright and Kope (1999) to organize and summarize extinction risk considerations. The approach of considering demographic ris ...
... In assessing extinction risk of this species, we considered the demographic viability factors developed by McElhany et al. (2000) and the risk matrix approach developed by Wainwright and Kope (1999) to organize and summarize extinction risk considerations. The approach of considering demographic ris ...
doi: 10.1111/j.1600-0706.2012.00005.x Subject Editor: Carlos Melian. Accepted 10 July 2012
... where dXi/dt is the rate of change in biomass X for species i, bi is the intrinsic growth rate of species i, and aij is the per capita effect of species j on the per capita growth rate of species i. In this model, consumers cannot establish in a food web in the absence of a prey population, thus 20. ...
... where dXi/dt is the rate of change in biomass X for species i, bi is the intrinsic growth rate of species i, and aij is the per capita effect of species j on the per capita growth rate of species i. In this model, consumers cannot establish in a food web in the absence of a prey population, thus 20. ...
Introduced species
![](https://commons.wikimedia.org/wiki/Special:FilePath/Melilotus_alba_bgiu.jpg?width=300)
An introduced, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. Some have a negative effect on a local ecosystem. Some introduced species may have no negative effect or only minor impact. Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides in agriculture for example. In some instances the potential for being beneficial or detrimental in the long run remains unknown. A list of some introduced species is given in a separate article.The effects of introduced species on natural environments have gained much scrutiny from scientists, governments, farmers and others.