Weighting and indirect effects identify keystone species in food webs
... Sanders et al. 2013). Both empirical (Sanders et al. 2013) and theoretical (Stouffer & Bascompte 2011; S€ aterberg et al. 2013) studies show that secondary extinctions can occur even when a species is more than one trophic link away from the primary extinction. Recent studies that used a static stru ...
... Sanders et al. 2013). Both empirical (Sanders et al. 2013) and theoretical (Stouffer & Bascompte 2011; S€ aterberg et al. 2013) studies show that secondary extinctions can occur even when a species is more than one trophic link away from the primary extinction. Recent studies that used a static stru ...
Western Grassland Reserves interim management
... Nature conservation in a human landscape The primary aim of the Western Grassland Reserves will be nature conservation. The reserves will be ‘protected areas’ in line with international standards (IUCN; Dudley 2008). However, the exact legal status of the reserves is yet to be determined, and an ov ...
... Nature conservation in a human landscape The primary aim of the Western Grassland Reserves will be nature conservation. The reserves will be ‘protected areas’ in line with international standards (IUCN; Dudley 2008). However, the exact legal status of the reserves is yet to be determined, and an ov ...
Day 10
... to function and provide services to our society • The loss of a species affects ecosystems differently - If the species can be functionally replaced by others, it may make little difference - Extinction of a keystone species may cause other species to decline or disappear • Precautionary principle: ...
... to function and provide services to our society • The loss of a species affects ecosystems differently - If the species can be functionally replaced by others, it may make little difference - Extinction of a keystone species may cause other species to decline or disappear • Precautionary principle: ...
Dominica Schools Booklet 2016
... order to maintain their preferred body temperature. If two species are in competition for areas of habitat with the same thermal properties, and are not able to partition that habitat in some other way, then they will be in direct competition with one another, which may result in the exclusion of th ...
... order to maintain their preferred body temperature. If two species are in competition for areas of habitat with the same thermal properties, and are not able to partition that habitat in some other way, then they will be in direct competition with one another, which may result in the exclusion of th ...
Tehachapi Pocket Mouse (Perognathus alticolus
... should be focused in late July through August, when activity is likely to persist after annual recruitment when population numbers are likely to be highest The San Bernardino National Forest contains the known localities for Tehachapi pocket mouse as well as additional potential habitat. Biologists ...
... should be focused in late July through August, when activity is likely to persist after annual recruitment when population numbers are likely to be highest The San Bernardino National Forest contains the known localities for Tehachapi pocket mouse as well as additional potential habitat. Biologists ...
Ecological Risk Assessment of Genetically Modified Higher Plants
... risk assessment of GMHPs. It does not discuss the actual risk assessment procedures and the risk evaluation, which must proceed the data collection. The report use the terminology “ecological risk assessment” rather than “environmental risk assessment” because at present this work does not include b ...
... risk assessment of GMHPs. It does not discuss the actual risk assessment procedures and the risk evaluation, which must proceed the data collection. The report use the terminology “ecological risk assessment” rather than “environmental risk assessment” because at present this work does not include b ...
1369-1376
... Heijden and Horton, 2009). Mycorrhizal networks play a key role in plant communities by facilitating and influencing seedling establishment, by altering plant –plant interactions and by supplying and recycling nutrients. Although some mycorrhizhal networks can be beneficial for those who are plugged ...
... Heijden and Horton, 2009). Mycorrhizal networks play a key role in plant communities by facilitating and influencing seedling establishment, by altering plant –plant interactions and by supplying and recycling nutrients. Although some mycorrhizhal networks can be beneficial for those who are plugged ...
Recent records and conservation issues
... and Robbins 2004, Githiru et al. 2008), there are no strongholds with high population density, and many sightings come from outside protected areas (Fanshawe et al. 1997). Until the 1980s wild dogs were considered reasonably common in the sprawling Tsavo Conservation Area (TCA) before drastically de ...
... and Robbins 2004, Githiru et al. 2008), there are no strongholds with high population density, and many sightings come from outside protected areas (Fanshawe et al. 1997). Until the 1980s wild dogs were considered reasonably common in the sprawling Tsavo Conservation Area (TCA) before drastically de ...
Increasing deterministic control of primary succession on Mount St
... the most common species in the study, together with Carex mertensii, Penstemon and Juncus parryi. CTC (Agrostis-Lupinus-Racomitrium) was similar to CT-B, but the proportions of the dominants differed and there was little Penstemon. CT-D (PenstemonAgrostis-Juncus) was sparsely vegetated, but diverse, ...
... the most common species in the study, together with Carex mertensii, Penstemon and Juncus parryi. CTC (Agrostis-Lupinus-Racomitrium) was similar to CT-B, but the proportions of the dominants differed and there was little Penstemon. CT-D (PenstemonAgrostis-Juncus) was sparsely vegetated, but diverse, ...
Genetic consequences of ecological reserve design guidelines: An
... to represent within-species genetic diversity when diversity patterns are unknown. This approach is in contrast to maximizing genetic diversity when patterns of within and among populations variation are known (e.g., Namkoong 1993; Ceska et al. 1997; Petit et al. 1998). Although it is equally import ...
... to represent within-species genetic diversity when diversity patterns are unknown. This approach is in contrast to maximizing genetic diversity when patterns of within and among populations variation are known (e.g., Namkoong 1993; Ceska et al. 1997; Petit et al. 1998). Although it is equally import ...
International Agreements for Global Biodiversity Conservation
... “reduced biodiversity” and “increased wealth” - selection of different natural capital portfolio Declining marginal costs of conversions ...
... “reduced biodiversity” and “increased wealth” - selection of different natural capital portfolio Declining marginal costs of conversions ...
Landscape Ecology MSc-thesis topics
... In this document, MSc students will find a program of MSc thesis topics in landscape ecology. Sustainable landscape development is the context of this program. Landscapes are defined as geographical regions which developed in the interplay between natural and human induced processes. Landscapes are ...
... In this document, MSc students will find a program of MSc thesis topics in landscape ecology. Sustainable landscape development is the context of this program. Landscapes are defined as geographical regions which developed in the interplay between natural and human induced processes. Landscapes are ...
Crossing habitat boundaries: coupling dynamics of ecosystems
... 2000). If the adult reproductive number is less than 1, then the deterministic extinction of the consumer is unavoidable. The adult reproductive number R0 can be greater than 1 only if the mean number of progeny produced by an adult during its lifetime (j) is greater than 1. As j is proportional to ...
... 2000). If the adult reproductive number is less than 1, then the deterministic extinction of the consumer is unavoidable. The adult reproductive number R0 can be greater than 1 only if the mean number of progeny produced by an adult during its lifetime (j) is greater than 1. As j is proportional to ...
Disturbance, Habitat Structure, and the Dynamics of a Coral
... (Huston 1979, Strong 1983). Disturbance may also alter density-dependent factors such as per capita death or birth rates (e.g., by promoting selective mortality, Connell 1978) and thus might be expected to generate density-dependent effects on other species in the system. Spatial heterogeneity may a ...
... (Huston 1979, Strong 1983). Disturbance may also alter density-dependent factors such as per capita death or birth rates (e.g., by promoting selective mortality, Connell 1978) and thus might be expected to generate density-dependent effects on other species in the system. Spatial heterogeneity may a ...
An Ecological Assessment of Insect Diversity at Organic Central
... biodiversity loss and to create healthy agroecosystems. Intensive agricultural production is driving the destruction of the planet’s greatest biodiversity hotspots, tropical rainforests. According to Perfecto and Vandermeer (2008), approximately 70% of land in tropical regions is a mixture of agricu ...
... biodiversity loss and to create healthy agroecosystems. Intensive agricultural production is driving the destruction of the planet’s greatest biodiversity hotspots, tropical rainforests. According to Perfecto and Vandermeer (2008), approximately 70% of land in tropical regions is a mixture of agricu ...
Crassostrea gigas - Pacific oyster UK NON
... 2.13 How important is social and other harm caused by the organism within its existing geographic range? ...
... 2.13 How important is social and other harm caused by the organism within its existing geographic range? ...
Ecological niche , , Jitka Polechov amp David Storch Department of
... utilises the resource.for example. and eventually to its extinction. this situation leads to simple negative feedback. a resource utilization function given by the frequency distribution of an important characteristic of utilized resource for example. therefore. a prey size. and the population growt ...
... utilises the resource.for example. and eventually to its extinction. this situation leads to simple negative feedback. a resource utilization function given by the frequency distribution of an important characteristic of utilized resource for example. therefore. a prey size. and the population growt ...
Plant-animal interactions in rainforest
... Animal-plant interactions associated with rainforests may bring economic benefits, for example, if a rainforest patch provided a source of insects that pollinated tree crops in adjacent farmland, or if a restoration planting reduced rodent predation in adjacent crops. Some rainforest animals may als ...
... Animal-plant interactions associated with rainforests may bring economic benefits, for example, if a rainforest patch provided a source of insects that pollinated tree crops in adjacent farmland, or if a restoration planting reduced rodent predation in adjacent crops. Some rainforest animals may als ...
Ecological niche - Biomathematics and Statistics Scotland
... competing species, since its population growth rate decreases to negative values in some conditions. To a good approximation, if we ignore stochastic sampling from a heterogeneous species’ population, species does fill its realized niche. According to Hutchinson’s formalization, niches of different ...
... competing species, since its population growth rate decreases to negative values in some conditions. To a good approximation, if we ignore stochastic sampling from a heterogeneous species’ population, species does fill its realized niche. According to Hutchinson’s formalization, niches of different ...
Mapping seaweed beds along Karachi coast using Remote sensing
... One of the important components for coastal system are seaweeds. Seaweed provide numerous ecosystem facilities: habitats, fishing nursery grounds, and provide feed production for aquatic biota; ability to absorb nutrients such as nitrogen and phosphorus and Carbon fixation for seawater purification. ...
... One of the important components for coastal system are seaweeds. Seaweed provide numerous ecosystem facilities: habitats, fishing nursery grounds, and provide feed production for aquatic biota; ability to absorb nutrients such as nitrogen and phosphorus and Carbon fixation for seawater purification. ...
Habitat Selection by Female Swift Foxes
... mines, quarries and gravel pits, mixed urban/built-up land, sandy-area beaches; sparse vegetation was comprised of only Badlands sparse vegetation complex whereas prairie dog (Cynomys ludovicianus) towns included only prairie dog town complexes. Row crop agricultural practices occur around BNP, whic ...
... mines, quarries and gravel pits, mixed urban/built-up land, sandy-area beaches; sparse vegetation was comprised of only Badlands sparse vegetation complex whereas prairie dog (Cynomys ludovicianus) towns included only prairie dog town complexes. Row crop agricultural practices occur around BNP, whic ...
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 ...
managing fisheries effects on marine food webs
... Species that directly interact (as predators or prey) with the target and by-catch species of fisheries (here collectively termed “fished species”; Fig. 2) are those most likely to exhibit an indirect response to fishing, particularly those with the strongest interactions with the fished species (Paine, ...
... Species that directly interact (as predators or prey) with the target and by-catch species of fisheries (here collectively termed “fished species”; Fig. 2) are those most likely to exhibit an indirect response to fishing, particularly those with the strongest interactions with the fished species (Paine, ...
Distribution pattern of the green alga Codium fragile (Suringar
... habitats where native algae have been harvested for food, the activity created major gaps in the community structure where opportunistic algae expanded their abundance within the community. Codium fragile not only becomes a dominant canopy species in disturbed habitats, but it also colonizes new hab ...
... habitats where native algae have been harvested for food, the activity created major gaps in the community structure where opportunistic algae expanded their abundance within the community. Codium fragile not only becomes a dominant canopy species in disturbed habitats, but it also colonizes new hab ...
Habitat conservation
Habitat conservation is a land management practice that seeks to conserve, protect and restore habitat areas for wild plants and animals, especially conservation reliant species, and prevent their extinction, fragmentation or reduction in range. It is a priority of many groups that cannot be easily characterized in terms of any one ideology.