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46-52. Full article - Entomologica Fennica
... already been recorded by Palm (1982) from Denmark, but it is evidently an incorrect record of feeding on berries (Svensson 1993). Some records of P. luedersiana from southern Europe and Turkey are doubtful, concerning a different, probably undescribed taxon (cf. Danilevsky & Kuznetsov 1968). A food ...
... already been recorded by Palm (1982) from Denmark, but it is evidently an incorrect record of feeding on berries (Svensson 1993). Some records of P. luedersiana from southern Europe and Turkey are doubtful, concerning a different, probably undescribed taxon (cf. Danilevsky & Kuznetsov 1968). A food ...
Kamau_LUCID_WP36
... sufficiently high nutrient quality (Walker, 1993). Grazing animals may exert beneficial or mutual influences on the vegetation for their own good but on the other hand, large concentration of them often have harmful effects on the plants because of selectivity and overgrazing. Quantifying the impact ...
... sufficiently high nutrient quality (Walker, 1993). Grazing animals may exert beneficial or mutual influences on the vegetation for their own good but on the other hand, large concentration of them often have harmful effects on the plants because of selectivity and overgrazing. Quantifying the impact ...
THE ROLE OF INTRODUCED SPECIES IN THE DEGRADATION OF
... curious skink (Carlia cf fusca). In addition, it is necessary to consider ecological alterations brought on by other changes in the ecosystem, for example, deforestation. Fortunately for biodiversity conservation, but unfortunately for ecological understanding, species introductions cannot be replic ...
... curious skink (Carlia cf fusca). In addition, it is necessary to consider ecological alterations brought on by other changes in the ecosystem, for example, deforestation. Fortunately for biodiversity conservation, but unfortunately for ecological understanding, species introductions cannot be replic ...
... they have a large influence on and also mediate many ecosystem processes. Several of these processes, such as decomposition and remineralisation of organic matter are important on a global scale and are essential to sustain life on Earth. The main aim of this thesis was to use an experimental ecosys ...
Relative importance of endogenous and exogenous mechanisms in
... neutrality (Hubbell, 2001; Scheffer & Van Nes, 2006). This list incorporates a great number of non-exclusive mechanisms, and there have been efforts to unite them all under a common synthetic framework. ...
... neutrality (Hubbell, 2001; Scheffer & Van Nes, 2006). This list incorporates a great number of non-exclusive mechanisms, and there have been efforts to unite them all under a common synthetic framework. ...
The ghosts of competition past - Oceanographic Environmental
... pinniped TP) would underestimate the number of pinniped-predators. We used 4.16 as the TP cutoff to identify pinniped-predators but also examined the effect of a less conservative threshold by comparing results with a TP value of 4.0 which was the mean pinniped TP, as the cutoff. TP assessments for ...
... pinniped TP) would underestimate the number of pinniped-predators. We used 4.16 as the TP cutoff to identify pinniped-predators but also examined the effect of a less conservative threshold by comparing results with a TP value of 4.0 which was the mean pinniped TP, as the cutoff. TP assessments for ...
Effects of wave exposure on
... ABSTRACT Effects of wave-exposure on a fore-reef community were investigated by quantitative biomass sampling and field manipulations at Galeta Point, Caribbean Panama. Three predictions of Connell's (1978) intermediate-disturbance hypothesis are examined: (1) community diversity should be low in hi ...
... ABSTRACT Effects of wave-exposure on a fore-reef community were investigated by quantitative biomass sampling and field manipulations at Galeta Point, Caribbean Panama. Three predictions of Connell's (1978) intermediate-disturbance hypothesis are examined: (1) community diversity should be low in hi ...
Low biodiversity state persists two decades after cessation of
... Although nutrient enrichment frequently decreases biodiversity, it remains unclear whether such biodiversity losses are readily reversible, or are critical transitions between alternative low- and high-diversity stable states that could be difficult to reverse. Our 30-year grassland experiment shows ...
... Although nutrient enrichment frequently decreases biodiversity, it remains unclear whether such biodiversity losses are readily reversible, or are critical transitions between alternative low- and high-diversity stable states that could be difficult to reverse. Our 30-year grassland experiment shows ...
Emerging directions in the study of the ecology and evolution of
... One potential problem for networks in our changing world is that alien mutualists, including both plants and pollinators, can integrate into native pollination networks, and sometimes end up acting as super-generalist species (a few species that interact with an extremely large number of species) of ...
... One potential problem for networks in our changing world is that alien mutualists, including both plants and pollinators, can integrate into native pollination networks, and sometimes end up acting as super-generalist species (a few species that interact with an extremely large number of species) of ...
24. Hunter Estuary Wetlands
... Table 1: Notes regarding alignment of terminology and additional information sourced from site managers to aid in the development of the sites ...
... Table 1: Notes regarding alignment of terminology and additional information sourced from site managers to aid in the development of the sites ...
Multiple diversity–stability mechanisms enhance population and
... tions and communities will simultaneously be stabilized with increasing richness because with these mechanisms community attributes become more stable through the reduction of the average variability of populations through different means (Table 1). The effects of biodiversity on the stability of po ...
... tions and communities will simultaneously be stabilized with increasing richness because with these mechanisms community attributes become more stable through the reduction of the average variability of populations through different means (Table 1). The effects of biodiversity on the stability of po ...
30 years of the endangered species act
... 200 to 300 Aleutian geese. Buldir was Many private landowners on the Califorone of few remaining islands with no nia coast and in the Sacramento and San foxes and a remnant goose population. Joaquin valleys manage their lands to So serious was the plight of the subspe- provide wintering habitat for ...
... 200 to 300 Aleutian geese. Buldir was Many private landowners on the Califorone of few remaining islands with no nia coast and in the Sacramento and San foxes and a remnant goose population. Joaquin valleys manage their lands to So serious was the plight of the subspe- provide wintering habitat for ...
Risk analysis report of non-native organisms in Belgium
... identifying the organism and its introduction pathways that should be considered for risk analysis in relation to Belgium, (2) the risk assessment stage which includes the categorization of emerging nonnative species to determine whether the criteria for a quarantine organism are satisfied and an ev ...
... identifying the organism and its introduction pathways that should be considered for risk analysis in relation to Belgium, (2) the risk assessment stage which includes the categorization of emerging nonnative species to determine whether the criteria for a quarantine organism are satisfied and an ev ...
ESDay2013MediaSample.. - Endangered Species Coalition
... contributing more than $160 million to these wildlife conservation projects. As poaching, deforestation and other factors continue to threaten these species, it is more important than ever for us to continue to collaboratively spread the message of conservation through educational programs and event ...
... contributing more than $160 million to these wildlife conservation projects. As poaching, deforestation and other factors continue to threaten these species, it is more important than ever for us to continue to collaboratively spread the message of conservation through educational programs and event ...
Herrera.1979.Oikos
... out during periods of variable length uniformly distributed from sunrise to dusk. Within a given month, observations were made during all times of the day. I walked slowly across the plots with periodic stops of 10-15 min. The whole plots were surveyed several times per month, deliberately avoiding ...
... out during periods of variable length uniformly distributed from sunrise to dusk. Within a given month, observations were made during all times of the day. I walked slowly across the plots with periodic stops of 10-15 min. The whole plots were surveyed several times per month, deliberately avoiding ...
What does ecological modelling model? A proposed classification of
... BAM diagram. If we use presence-only data, the model also represents the realized niche, because correlations among the species distribution and the environmental factors are obtained through the presence data. If the position of species records change, the values of the variables also change (Lobo ...
... BAM diagram. If we use presence-only data, the model also represents the realized niche, because correlations among the species distribution and the environmental factors are obtained through the presence data. If the position of species records change, the values of the variables also change (Lobo ...
Marsupials as introduced species: Long- term - PalaeoWorks
... niches, some of which proved to be quite vulnerable to foreign invasive species such as dingos, foxes, cats, rabbits and humans, and some of which proved to be quite resilient and potentially invasive themselves – for example, Australia’s recent challenges in managing the ecological impacts of over- ...
... niches, some of which proved to be quite vulnerable to foreign invasive species such as dingos, foxes, cats, rabbits and humans, and some of which proved to be quite resilient and potentially invasive themselves – for example, Australia’s recent challenges in managing the ecological impacts of over- ...
Persist or Produce: A Community Trade-Off Tuned by Species
... the survival probabilities. This approach followed three steps. First, we randomly generated the niche position of each species in a two-dimensional niche space and computed the niche overlap matrix a (eq. [2]). The two coordinates of each species were sampled uniformly between 0 and 1. The niche wi ...
... the survival probabilities. This approach followed three steps. First, we randomly generated the niche position of each species in a two-dimensional niche space and computed the niche overlap matrix a (eq. [2]). The two coordinates of each species were sampled uniformly between 0 and 1. The niche wi ...
An Analysis of Persistence, Resilience, and the Conservation of
... case, species numbers have dwindled to such an extent that preventive policy measures such as regulations on the nature of fishing equipment and moratoriums on grazing are put in place to ensure that literal death does not occur. This is the case of figurative death. In the second case, some species ...
... case, species numbers have dwindled to such an extent that preventive policy measures such as regulations on the nature of fishing equipment and moratoriums on grazing are put in place to ensure that literal death does not occur. This is the case of figurative death. In the second case, some species ...
File - Mr. Greening`s Science
... increased. B) The dodo bird population increased after the birds learned to build their nests in trees. C) Human exploitation and introduced species significantly reduced dodo bird populations. D) The dodo bird population became smaller because they preyed upon the introduced species. 20. Rabbits ar ...
... increased. B) The dodo bird population increased after the birds learned to build their nests in trees. C) Human exploitation and introduced species significantly reduced dodo bird populations. D) The dodo bird population became smaller because they preyed upon the introduced species. 20. Rabbits ar ...
Biodiversity and Climate Change: Integrating
... Ecology and evolution have developed as separate fields based on the distinction between “ecological time” and “evolutionary time” made by Slobodkin (1961). Hairston et al. (2005) have proposed that rapid evolution should be defined as genetic changes occurring fast enough to have a measurable impac ...
... Ecology and evolution have developed as separate fields based on the distinction between “ecological time” and “evolutionary time” made by Slobodkin (1961). Hairston et al. (2005) have proposed that rapid evolution should be defined as genetic changes occurring fast enough to have a measurable impac ...
Response of macroarthropod assemblages to the loss
... coarse woody debris, twigs, and leaves after the trees have died in place versus essentially instantaneous removal of boles and large limbs leaving only small branches, twigs, and leaves atop soil compacted by heavy machinery— should have profound consequences for species dependent on hemlock’s diff ...
... coarse woody debris, twigs, and leaves after the trees have died in place versus essentially instantaneous removal of boles and large limbs leaving only small branches, twigs, and leaves atop soil compacted by heavy machinery— should have profound consequences for species dependent on hemlock’s diff ...
Invasion in a heterogeneous world: resistance, coexistence or
... 1998). Conversely, impacts at other levels of organization are potentially influenced by the particular community context. Several recent reviews have suggested that invasive species can increase community diversity, rather than induce extinction of resident species (e.g. Davis 2003; Sax & Gaines 20 ...
... 1998). Conversely, impacts at other levels of organization are potentially influenced by the particular community context. Several recent reviews have suggested that invasive species can increase community diversity, rather than induce extinction of resident species (e.g. Davis 2003; Sax & Gaines 20 ...
Oct/Nov 2007 - Barung Landcare
... also stabilises the soil (particularly on stream banks). The future for agriculture (and therefore civilization?) depends on our ability to adopt productive farming systems (and social systems) which also enhance and protect the natural ecosystems upon which they depend. ...
... also stabilises the soil (particularly on stream banks). The future for agriculture (and therefore civilization?) depends on our ability to adopt productive farming systems (and social systems) which also enhance and protect the natural ecosystems upon which they depend. ...
Invasive Species - Parliament of Australia
... directly abuts another sovereign nation. It also has some of the busiest ports and airports for foreign shipping and travellers and is a major port of call for foreign tourist yachts. The population is only 3.4 million people but has increased 27% in the last 10 years. The state has 13 terrestrial b ...
... directly abuts another sovereign nation. It also has some of the busiest ports and airports for foreign shipping and travellers and is a major port of call for foreign tourist yachts. The population is only 3.4 million people but has increased 27% in the last 10 years. The state has 13 terrestrial b ...
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.