![Effective Population Size, Gene Flow, and Species Status in a](http://s1.studyres.com/store/data/016366012_1-5658865b4193631bec9c79a238ea809e-300x300.png)
Effective Population Size, Gene Flow, and Species Status in a
... the decision of whether or not H. neglectus should be considered a distinct species or a subspecies of H. petiolaris as “somewhat arbitrary”. Relationships between H. neglectus and H. petiolaris have not been addressed in detail for two decades [15], during which time the increased availability of m ...
... the decision of whether or not H. neglectus should be considered a distinct species or a subspecies of H. petiolaris as “somewhat arbitrary”. Relationships between H. neglectus and H. petiolaris have not been addressed in detail for two decades [15], during which time the increased availability of m ...
Camden Valley Way REF - Ecological Assessment
... Occurs in Queensland and reaches its southern limit in NSW. In NSW it is known from only three locations near Tenterfield, including Bald Rock National Park. Found in open eucalypt forest and woodland on well-drained granite hilltops, slopes and rocky outcrops. Genoplesium baueri (Bauer’s Midge Orch ...
... Occurs in Queensland and reaches its southern limit in NSW. In NSW it is known from only three locations near Tenterfield, including Bald Rock National Park. Found in open eucalypt forest and woodland on well-drained granite hilltops, slopes and rocky outcrops. Genoplesium baueri (Bauer’s Midge Orch ...
Relationship of calling intensity to - Research Online
... Humphries, 1979; Okuno, 1985; Radwan and Schneider, 1988) have most consistently been found to correlate with the number of males calling at a given time and/or the intensity of their calling activity, usually showing a positive relationship. Humidity also often correlates with calling activity (Alm ...
... Humphries, 1979; Okuno, 1985; Radwan and Schneider, 1988) have most consistently been found to correlate with the number of males calling at a given time and/or the intensity of their calling activity, usually showing a positive relationship. Humidity also often correlates with calling activity (Alm ...
Locally rare species influence grassland ecosystem
... majority of the species in any natural community and are more sensitive to anthropogenic disturbances [12,13]. Thus, quantifying the functional consequences of their loss is of particular importance to predict the provision of ecosystem services in the future. The functional importance of common ver ...
... majority of the species in any natural community and are more sensitive to anthropogenic disturbances [12,13]. Thus, quantifying the functional consequences of their loss is of particular importance to predict the provision of ecosystem services in the future. The functional importance of common ver ...
Paper - Journal of Environmental Biology
... (Alvarez-Cobelas and Jacobsen, 1992; Sommaruga and Robarts, ...
... (Alvarez-Cobelas and Jacobsen, 1992; Sommaruga and Robarts, ...
Locally rare species influence grassland ecosystem multifunctionality
... majority of the species in any natural community and are more sensitive to anthropogenic disturbances [12,13]. Thus, quantifying the functional consequences of their loss is of particular importance to predict the provision of ecosystem services in the future. The functional importance of common ver ...
... majority of the species in any natural community and are more sensitive to anthropogenic disturbances [12,13]. Thus, quantifying the functional consequences of their loss is of particular importance to predict the provision of ecosystem services in the future. The functional importance of common ver ...
Stochastic competitive exclusion leads to a cascade of
... steady-state distribution for two-species communities presents a maximum at an interior point of the configuration space, as well as two boundary maxima with population vectors of the form (n, 0) and (0, n). This implies that the discrete probability distribution, when extended to be real-valued (by ...
... steady-state distribution for two-species communities presents a maximum at an interior point of the configuration space, as well as two boundary maxima with population vectors of the form (n, 0) and (0, n). This implies that the discrete probability distribution, when extended to be real-valued (by ...
Traitbased tests of coexistence mechanisms
... fact, viewed at a finer, within-community spatial scale, niche partitioning is simply environmental filtering, with species sorted into different microsites based on their seed sizes (Fig. 1c). Our simulation, in which spatial heterogeneity generates coexistence, makes this especially clear, but the ...
... fact, viewed at a finer, within-community spatial scale, niche partitioning is simply environmental filtering, with species sorted into different microsites based on their seed sizes (Fig. 1c). Our simulation, in which spatial heterogeneity generates coexistence, makes this especially clear, but the ...
Quantifying the Contribution of Organisms to the Provision of
... with control sites with no breeding pairs (table 2). The density of breeding pairs is crucial because caterpillars are an important part of the bird’s diet during this period, and they are a preferred food item for nestlings. It is therefore vital that the breeding season coincides with caterpillar ...
... with control sites with no breeding pairs (table 2). The density of breeding pairs is crucial because caterpillars are an important part of the bird’s diet during this period, and they are a preferred food item for nestlings. It is therefore vital that the breeding season coincides with caterpillar ...
Invasive alien species: priorities for international research
... Research to support IAS initiatives in islands, especially the UK’s Overseas Territories (and Crown Dependencies). Islands have a very rich biodiversity, with a high degree of endemism, some components of which are severely threatened by IAS. The MA identified IAS as the most significant driver of b ...
... Research to support IAS initiatives in islands, especially the UK’s Overseas Territories (and Crown Dependencies). Islands have a very rich biodiversity, with a high degree of endemism, some components of which are severely threatened by IAS. The MA identified IAS as the most significant driver of b ...
Rhododendron in Snowdonia - Snowdonia National Park Authority
... as oaks and birches. Unfortunately, it is not entirely clear what the full impacts of Rhododendron are on the natural cycle of woodland regeneration due to no such studies being taken (as far as we’re aware). This is primarily due to the length of time it takes for a Rhododendron stand to mature and ...
... as oaks and birches. Unfortunately, it is not entirely clear what the full impacts of Rhododendron are on the natural cycle of woodland regeneration due to no such studies being taken (as far as we’re aware). This is primarily due to the length of time it takes for a Rhododendron stand to mature and ...
7th Annual EFJ Public Lecture - The Environmental Foundation of
... ‘Biodiversity Hotspots” are regions of the world that contain a large number of endemic species that are threatened with extinction. Endemic species are those found only in particular places, such as on particular islands – like Jamaica. The Caribbean is one of 25 recognized global hotspots, and Jam ...
... ‘Biodiversity Hotspots” are regions of the world that contain a large number of endemic species that are threatened with extinction. Endemic species are those found only in particular places, such as on particular islands – like Jamaica. The Caribbean is one of 25 recognized global hotspots, and Jam ...
Within outlying mean indexes: refining the OMI analysis for
... the subniches of species within a community in the same reference plane, made by the resulting factorial axes from the OMI analysis. The subniche is defined hereafter, as a subset of habitat conditions used by a species. Inspired by the OMI analysis (Dolédec, Chessel & Gimaret-Carpentier, 2000) and ...
... the subniches of species within a community in the same reference plane, made by the resulting factorial axes from the OMI analysis. The subniche is defined hereafter, as a subset of habitat conditions used by a species. Inspired by the OMI analysis (Dolédec, Chessel & Gimaret-Carpentier, 2000) and ...
A quicker return energyuse strategy by populations of a subtropical
... whether plants from invasive populations of a species show reduced allocation to defence and increased allocation to growth than plants from native populations. But few have attempted to understand ecophysiological mechanisms by which decreased allocation to defence may increase growth. 2. Previousl ...
... whether plants from invasive populations of a species show reduced allocation to defence and increased allocation to growth than plants from native populations. But few have attempted to understand ecophysiological mechanisms by which decreased allocation to defence may increase growth. 2. Previousl ...
species extinction
... Zebra mussels:accidental release of an alien species • May have been introduced by European cargo ships which contained mussels in ballast water ...
... Zebra mussels:accidental release of an alien species • May have been introduced by European cargo ships which contained mussels in ballast water ...
a full - British Ecological Society
... Spatio-temporal heterogeneity and/or environmental uncertainty are important conditions for coexistence in all of these models, although as far as we are aware, they have not previously been gathered together in this way. In (1), species persist because random walks to extinction are exceedingly slo ...
... Spatio-temporal heterogeneity and/or environmental uncertainty are important conditions for coexistence in all of these models, although as far as we are aware, they have not previously been gathered together in this way. In (1), species persist because random walks to extinction are exceedingly slo ...
Section 4 - Chandler Unified School District / Overview
... • Interspecific competition results from different species in conflict over the same resources. Intraspecific competition results from the conflict that results from the same species. Competitive exclusion is the result of the better competitor eliminating the weaker competitor. • Interactions betwe ...
... • Interspecific competition results from different species in conflict over the same resources. Intraspecific competition results from the conflict that results from the same species. Competitive exclusion is the result of the better competitor eliminating the weaker competitor. • Interactions betwe ...
HYBRIDIZATION DYNAMICS OF INVASIVE CATTAIL
... Species of Typha L. (Typhaceae), commonly known as cattails, are highly productive emergent plants that grow in a variety of wetland habitats throughout the world (McManus et al. 2002). In the northern USA and Canada three taxa of cattail have been recognized: Typha latifolia L. (broad-leaf cattail) ...
... Species of Typha L. (Typhaceae), commonly known as cattails, are highly productive emergent plants that grow in a variety of wetland habitats throughout the world (McManus et al. 2002). In the northern USA and Canada three taxa of cattail have been recognized: Typha latifolia L. (broad-leaf cattail) ...
The role of environmental generalist species in ecosystem function
... different specialist species could dominate as the environment changes. However, complementary responses of specialist species may not be necessary to maintain ecosystem function under suboptimal or variable conditions. For example, if the cost of generalization is less than the cost of coping with ...
... different specialist species could dominate as the environment changes. However, complementary responses of specialist species may not be necessary to maintain ecosystem function under suboptimal or variable conditions. For example, if the cost of generalization is less than the cost of coping with ...
What does biodiversity actually do? A review for managers and
... species loss is much greater than anything experienced historically. The question therefore is not whether we are losing biodiversity, but what the likely effects of that biodiversity loss are. Despite a global perception of declining biodiversity, managers are frequently presented with situations wh ...
... species loss is much greater than anything experienced historically. The question therefore is not whether we are losing biodiversity, but what the likely effects of that biodiversity loss are. Despite a global perception of declining biodiversity, managers are frequently presented with situations wh ...
Species interactions, local and regional processes, and limits to the
... Spatio-temporal heterogeneity and/or environmental uncertainty are important conditions for coexistence in all of these models, although as far as we are aware, they have not previously been gathered together in this way. In (1), species persist because random walks to extinction are exceedingly slo ...
... Spatio-temporal heterogeneity and/or environmental uncertainty are important conditions for coexistence in all of these models, although as far as we are aware, they have not previously been gathered together in this way. In (1), species persist because random walks to extinction are exceedingly slo ...
Principles and Concepts of Pest Management, In
... Surveillance or monitoring means constant observation of a subject i.e., a crop or pest, and recording the factors observed, compilation of information obtained and prediction of future events about pest population. Hence pest surveillance comprises of three basic components. a. Determination of the ...
... Surveillance or monitoring means constant observation of a subject i.e., a crop or pest, and recording the factors observed, compilation of information obtained and prediction of future events about pest population. Hence pest surveillance comprises of three basic components. a. Determination of the ...
Benthic use of phytoplankton blooms: Agnes M. L. Karlson
... Three main hypotheses that relate the responses of ecosystem processes to reductions in species richness have been proposed (e.g. Lawton 1994). First, the linear, “rivet” hypothesis suggests that all species contribute to ecosystem function (e.g. Lawton 1994). Second, the “redundancy” hypothesis sug ...
... Three main hypotheses that relate the responses of ecosystem processes to reductions in species richness have been proposed (e.g. Lawton 1994). First, the linear, “rivet” hypothesis suggests that all species contribute to ecosystem function (e.g. Lawton 1994). Second, the “redundancy” hypothesis sug ...
Ocular morphology in antarctic notothenioid fishes
... choroid body, and its presence was considered a primitive character state for notothenioids. The choroid body was absent in phyletically derived groups. The choroid body was especially large in Dissostichus mawsoni, the only species with a rod dominated retina. Retinae were 154-279 pm thick with lay ...
... choroid body, and its presence was considered a primitive character state for notothenioids. The choroid body was absent in phyletically derived groups. The choroid body was especially large in Dissostichus mawsoni, the only species with a rod dominated retina. Retinae were 154-279 pm thick with lay ...
Ecosystem Consequences of Biological Invasions
... range in scale from small, plot-scale studies of individual flux rates to landscape-scale transformations of extensive areas. Species that alter ecological conditions (biotic, abiotic, or both) over larger regions have been termed transformers (Richardson et al. 2000). However, species may change flux ...
... range in scale from small, plot-scale studies of individual flux rates to landscape-scale transformations of extensive areas. Species that alter ecological conditions (biotic, abiotic, or both) over larger regions have been termed transformers (Richardson et al. 2000). However, species may change flux ...
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.