Fundamental and realized niches
... The opposing view was tested by David Tilman in studies of competition among three species of prairie grasses. Plots were fertilized with ammonium nitrate at three levels: low, medium, and high. The intensity of competition did not vary much. What changed was the nature of the competition… At low n ...
... The opposing view was tested by David Tilman in studies of competition among three species of prairie grasses. Plots were fertilized with ammonium nitrate at three levels: low, medium, and high. The intensity of competition did not vary much. What changed was the nature of the competition… At low n ...
The Ecological Impacts of Non-Native Species on River Otter
... they can also have positive impacts on native biota (Barrientos et al., 2014). One keystone species that has been impacted by the introduction of nonnative species is the river otter. Due to their piscivourous and food-dependent nature, otters can serve as effective bio-indicators for lake health th ...
... they can also have positive impacts on native biota (Barrientos et al., 2014). One keystone species that has been impacted by the introduction of nonnative species is the river otter. Due to their piscivourous and food-dependent nature, otters can serve as effective bio-indicators for lake health th ...
Stability, Equilibrium, and Non
... suggested by Elton (1958), has not held up well under scrutiny. • Experimental studies of communities of microorganisms have not shown a strong link of diversity with stability. Large-scale field experiments with plants have shown a link between diversity and stability. ...
... suggested by Elton (1958), has not held up well under scrutiny. • Experimental studies of communities of microorganisms have not shown a strong link of diversity with stability. Large-scale field experiments with plants have shown a link between diversity and stability. ...
Educational Simulation of Complex Ecosystems in the World
... different ecological systems, and thus generate the several html pages that make up the course. The automatic preparation of the course ends here. Manual adjustment are needed to fill the html skeletons with explanations, images and cross references to other pages. The resulting set of pages is read ...
... different ecological systems, and thus generate the several html pages that make up the course. The automatic preparation of the course ends here. Manual adjustment are needed to fill the html skeletons with explanations, images and cross references to other pages. The resulting set of pages is read ...
Introduction pathways and establishment rates of invasive aquatic
... of freshwater invasions, the tens rule has been mostly evaluated for terrestrial plants, birds, and biocontrol insects (Williamson 1996; Kolar and Lodge 2001; Lockwood et al. 2001). Although the tens rule is a rule of thumb, there are previous formal tests of the rule (Lockwood et al. 2001), and the ...
... of freshwater invasions, the tens rule has been mostly evaluated for terrestrial plants, birds, and biocontrol insects (Williamson 1996; Kolar and Lodge 2001; Lockwood et al. 2001). Although the tens rule is a rule of thumb, there are previous formal tests of the rule (Lockwood et al. 2001), and the ...
Biodiversity Review 2
... Habitat fragmentation It results in small “islands” of natural area isolated from each other by crop land, pasture, pavement, or even barren land. http://en.wikipedia.org/wiki/Habitat_fragmentation ...
... Habitat fragmentation It results in small “islands” of natural area isolated from each other by crop land, pasture, pavement, or even barren land. http://en.wikipedia.org/wiki/Habitat_fragmentation ...
Introduction to environmental biology - Assets
... However, it also occurs in hedgerows close to cereal crops or sugar beet, and in salt marshes. On islands (e.g. the Isle of Man, Rhum and Lundy) rats also occupy grassland and the sea shore. With small organisms, especially those living in a restricted area such as in the soil or on a single plant o ...
... However, it also occurs in hedgerows close to cereal crops or sugar beet, and in salt marshes. On islands (e.g. the Isle of Man, Rhum and Lundy) rats also occupy grassland and the sea shore. With small organisms, especially those living in a restricted area such as in the soil or on a single plant o ...
“ON THE ORIGIN OF SPECIES”
... Darwin’s theory is based on the notion of variation. It argues that the numerous traits and adaptations that differentiate species from each other also explain how species evolved over time and gradually diverged. Variations in organisms are apparent both within domesticated species and within speci ...
... Darwin’s theory is based on the notion of variation. It argues that the numerous traits and adaptations that differentiate species from each other also explain how species evolved over time and gradually diverged. Variations in organisms are apparent both within domesticated species and within speci ...
read the Federal Register Notice here
... Seven of the 15 threatened IndoPacific coral species have been confirmed to occur within U.S. Pacific jurisdictional areas including Guam, the Commonwealth of the Northern Mariana Islands, the Pacific Remote Island areas, and American Samoa (See Table 1). This information may change as more surveys ...
... Seven of the 15 threatened IndoPacific coral species have been confirmed to occur within U.S. Pacific jurisdictional areas including Guam, the Commonwealth of the Northern Mariana Islands, the Pacific Remote Island areas, and American Samoa (See Table 1). This information may change as more surveys ...
Envirothon Wildlife
... In New York, the clutch size ranges from 5-12 eggs with an average of eight. This species' range centers around the Great Lakes, and extends from central Nebraska and Minnesota eastward through southern Ontario and the south shore of Lake Erie as far east as northern New York, with a few disjunct po ...
... In New York, the clutch size ranges from 5-12 eggs with an average of eight. This species' range centers around the Great Lakes, and extends from central Nebraska and Minnesota eastward through southern Ontario and the south shore of Lake Erie as far east as northern New York, with a few disjunct po ...
2003ecologyletters
... phylogenetically broader studies. However, even congeneric plants often differ in invasiveness: Mack et al. (2000) indicate that Ôguilt by [taxonomic] association has proven imprecise at predicting invasive potentialÕ. Thus, we contend that the benefits of phylogenetic control outweigh the costs, as ...
... phylogenetically broader studies. However, even congeneric plants often differ in invasiveness: Mack et al. (2000) indicate that Ôguilt by [taxonomic] association has proven imprecise at predicting invasive potentialÕ. Thus, we contend that the benefits of phylogenetic control outweigh the costs, as ...
Great Plains toad
... breeding. However, its use of flooded agricultural fields suggests that it can handle a certain amount of disturbance. Application of pesticides and herbicides may also be a concern, given the sensitivity of amphibians to chemicals and pollutants. Roadkill by vehicles has been identified as a leadin ...
... breeding. However, its use of flooded agricultural fields suggests that it can handle a certain amount of disturbance. Application of pesticides and herbicides may also be a concern, given the sensitivity of amphibians to chemicals and pollutants. Roadkill by vehicles has been identified as a leadin ...
why plant native trees?
... 40 cm in diameter are achievable within 50 years of planting for kauri and totara (Podocarpus totara). While development of heartwood is slow, particularly in native conifers, the sapwood of planted kauri and totara trees less than 50 years of age contains a range of colours and textures. A range of ...
... 40 cm in diameter are achievable within 50 years of planting for kauri and totara (Podocarpus totara). While development of heartwood is slow, particularly in native conifers, the sapwood of planted kauri and totara trees less than 50 years of age contains a range of colours and textures. A range of ...
Article ZOOTAXA
... The family of Eunicidae Berthold, 1827 is one of the largest polychaete families (Fauchald 1970). To date, the genus Marphysa Quatrefages, 1865 alone contains 76 valid species (Fauchald & Bellan 2013) and there are several being recently described. The diagnostic features of the genus that were trad ...
... The family of Eunicidae Berthold, 1827 is one of the largest polychaete families (Fauchald 1970). To date, the genus Marphysa Quatrefages, 1865 alone contains 76 valid species (Fauchald & Bellan 2013) and there are several being recently described. The diagnostic features of the genus that were trad ...
H. pakistanae - Sam Houston State University
... species - through competition, predation, or transmission of pathogens - and the disruption of local ecosystems and ecosystem functions ...
... species - through competition, predation, or transmission of pathogens - and the disruption of local ecosystems and ecosystem functions ...
Chapter 6 The Geography of Evolution
... “After the last glacial period, western hemlock recolonized its current range from refugia. Disjunct populations of some otherwise coastal mesic forest plants, such as western hemlock, are found inland in the northern Rocky Mountains. Two contrasting hypotheses have been proposed to explain these di ...
... “After the last glacial period, western hemlock recolonized its current range from refugia. Disjunct populations of some otherwise coastal mesic forest plants, such as western hemlock, are found inland in the northern Rocky Mountains. Two contrasting hypotheses have been proposed to explain these di ...
Chlidonias albostriatus, Black-fronted Tern
... Chlidonias albostriatus breeds in the South Island, New Zealand. It is found along the eastern riverbeds from Marlborough to Southland, and on the upper Motueka and Buller Rivers in southern Nelson (Heather and Robertson 1997). Birds disperse to the coastline and estuaries in winter, mostly from Ste ...
... Chlidonias albostriatus breeds in the South Island, New Zealand. It is found along the eastern riverbeds from Marlborough to Southland, and on the upper Motueka and Buller Rivers in southern Nelson (Heather and Robertson 1997). Birds disperse to the coastline and estuaries in winter, mostly from Ste ...
Biogeography - Cockrell - Tarleton State University
... sandy beach nearby? How does a species come to be confined to its present range? What are a species’ closest relatives, & where can they be found? Where did its ancestors live? ...
... sandy beach nearby? How does a species come to be confined to its present range? What are a species’ closest relatives, & where can they be found? Where did its ancestors live? ...
Fig. 46-12b, p.829
... salamanders species overlap in parts of their ranges Removed one species or the other in test plots Control plots unaltered 5 years later, salamander populations were growing in test plot ...
... salamanders species overlap in parts of their ranges Removed one species or the other in test plots Control plots unaltered 5 years later, salamander populations were growing in test plot ...
Modern Reptile Taxa - Indiana State University
... 1. Paraphyletic if birds are excluded 2. United by ecology (and sympleisiomorphies) a. exothermic b. amniotic eggs c. left overs of Mesozoic ...
... 1. Paraphyletic if birds are excluded 2. United by ecology (and sympleisiomorphies) a. exothermic b. amniotic eggs c. left overs of Mesozoic ...
chapter 6 - Lisle CUSD 202
... Both cockroaches and humans are generalist species having very broad niches. This means that they can live in many different places, eat a variety of foods, and tolerate a wide range of environmental conditions. Cockroaches have been around for 350 million years and have thrived throughout the evolu ...
... Both cockroaches and humans are generalist species having very broad niches. This means that they can live in many different places, eat a variety of foods, and tolerate a wide range of environmental conditions. Cockroaches have been around for 350 million years and have thrived throughout the evolu ...
Why is the elephant a `cousin` of the hyrax?
... more species of Afrotheria than there are today. For example there were 10 or more species of hyrax in Africa which varied in size from pig to rabbit-sized animals. Today all hyraxes are similar in size to a rabbit, the larger forms now being extinct. Some Afrotheria share some unusual common physio ...
... more species of Afrotheria than there are today. For example there were 10 or more species of hyrax in Africa which varied in size from pig to rabbit-sized animals. Today all hyraxes are similar in size to a rabbit, the larger forms now being extinct. Some Afrotheria share some unusual common physio ...
Ecology5e Chapter 14 Online Supplementary Materials
... Concept: Exotic predators can collapse and simplify the structure of food webs. Introduced Fish That Simplify Aquatic Food Webs Humans have moved all sorts of species around the planet, but some of the most commonly introduced organisms are fish. Unfortunately, introduced fish are often the source o ...
... Concept: Exotic predators can collapse and simplify the structure of food webs. Introduced Fish That Simplify Aquatic Food Webs Humans have moved all sorts of species around the planet, but some of the most commonly introduced organisms are fish. Unfortunately, introduced fish are often the source o ...
Introduced species
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.