![19-Population ecology](http://s1.studyres.com/store/data/004086967_1-68f1b5a900e374e6da071a1a81d77ae9-300x300.png)
19-Population ecology
... (Figure 19.3). Different distributions reflect important aspects of the biology of the species; they also affect the mathematical methods required to estimate population sizes. An example of random distribution occurs with dandelion and other plants that have wind-dispersed seeds that germinate wher ...
... (Figure 19.3). Different distributions reflect important aspects of the biology of the species; they also affect the mathematical methods required to estimate population sizes. An example of random distribution occurs with dandelion and other plants that have wind-dispersed seeds that germinate wher ...
46. Pulu Keeling National Park
... aligned to be consistent with the approach of the Ramsar Rolling Review (see Table 1 explanation notes). The Ramsar Rolling Review uses the IUCN threat classification (reference) to standardise terminology across sites. All threat categories identified at the Pulu Keeling National Park Ramsar site a ...
... aligned to be consistent with the approach of the Ramsar Rolling Review (see Table 1 explanation notes). The Ramsar Rolling Review uses the IUCN threat classification (reference) to standardise terminology across sites. All threat categories identified at the Pulu Keeling National Park Ramsar site a ...
Plant diversity consequences of a herbivore-driven biome
... al. 1994). It has further been supported by reduced livestock carrying capacities, as inferred from lower livestock numbers in recent decades (Dean and Macdonald 1994). But, this reduction may alternatively be ascribed to increased commercialism of farming, greater conservation awareness and the int ...
... al. 1994). It has further been supported by reduced livestock carrying capacities, as inferred from lower livestock numbers in recent decades (Dean and Macdonald 1994). But, this reduction may alternatively be ascribed to increased commercialism of farming, greater conservation awareness and the int ...
On the organization of ecosystems Veldhuis, Michiel
... essential materials (carbon, nutrients). For example: species A produces the resources needed by species B, B produces the resources needed by C and C produces the resources needed by A (Fig 1A). Similar to biochemical autocatalytic loops in a cell, such ecological autocatalytic loops in ecosystems ...
... essential materials (carbon, nutrients). For example: species A produces the resources needed by species B, B produces the resources needed by C and C produces the resources needed by A (Fig 1A). Similar to biochemical autocatalytic loops in a cell, such ecological autocatalytic loops in ecosystems ...
Patterns of trophic niche divergence between invasive and native
... established 1 month prior to the fish being introduced by filling them with water from a nearby fishless pond. Each was provided with a gravel (c. 6 mm diameter) substrata (15 cm depth), provided with fish refuge structures (two open-ended circular plastic tubes of 15 cm length and 6 cm diameter) a ...
... established 1 month prior to the fish being introduced by filling them with water from a nearby fishless pond. Each was provided with a gravel (c. 6 mm diameter) substrata (15 cm depth), provided with fish refuge structures (two open-ended circular plastic tubes of 15 cm length and 6 cm diameter) a ...
Diversity, evolutionary specialization and geographic distribution of
... pith. Their seedlings can already be colonized by ants when they are only about l 0 c m tall (then possessing but one internode suitable for colonization). In some species, however (Macarangapearsonii Merr., M. hosei King ex Hook f., and M. pruinosa (Miq.) Muell.Arg.), the stem’s interior does not b ...
... pith. Their seedlings can already be colonized by ants when they are only about l 0 c m tall (then possessing but one internode suitable for colonization). In some species, however (Macarangapearsonii Merr., M. hosei King ex Hook f., and M. pruinosa (Miq.) Muell.Arg.), the stem’s interior does not b ...
Allocating CSR plant functional types: the use of leaf
... et al. 2010a; Pierce et al. 2012), providing ‘a dependable common reference frame for the quantitative comparison of the wider primary adaptive strategies of plants from highly contrasting habitats’ (Pierce et al. 2012). Notably, Hodgson et al. (1999) use of whole-plant traits, which do not allow ta ...
... et al. 2010a; Pierce et al. 2012), providing ‘a dependable common reference frame for the quantitative comparison of the wider primary adaptive strategies of plants from highly contrasting habitats’ (Pierce et al. 2012). Notably, Hodgson et al. (1999) use of whole-plant traits, which do not allow ta ...
An intercontinental comparison of the dynamic
... virginianus [Zimmermann]). A former major player in this system, now extinct, is the passenger pigeon (Ectopistes migratorius), while an important new invertebrate herbivore, the gypsy moth (Lymantria dispar), was introduced ...
... virginianus [Zimmermann]). A former major player in this system, now extinct, is the passenger pigeon (Ectopistes migratorius), while an important new invertebrate herbivore, the gypsy moth (Lymantria dispar), was introduced ...
Biotic factors in amphibian population declines - Amphibia
... emergence of new species have brought amphibians into contact with new organisms, novel relationships that have proven detrimental, neutral, or beneficial to amphibians have become established. This process has occurred naturally over time, independent of human involvement. Success of amphibians dur ...
... emergence of new species have brought amphibians into contact with new organisms, novel relationships that have proven detrimental, neutral, or beneficial to amphibians have become established. This process has occurred naturally over time, independent of human involvement. Success of amphibians dur ...
Butterfly Breeding Guide
... throughout the North Island. The caterpillars of both species feed on legumes, especially the introduced clovers and medics, which grow along roadsides and on gravel wasteland and riverbeds. Rauparaha’s Copper/mokarakare (Lycaena rauparaha) Rauparaha’s Copper/mokarakare butterflies are New Zealand n ...
... throughout the North Island. The caterpillars of both species feed on legumes, especially the introduced clovers and medics, which grow along roadsides and on gravel wasteland and riverbeds. Rauparaha’s Copper/mokarakare (Lycaena rauparaha) Rauparaha’s Copper/mokarakare butterflies are New Zealand n ...
Northeast - Trout Unlimited
... and spread of non-native species. Historical fisheries management was often focused on diversifying fishing opportunities for anglers, resulting in the introduction of various species from other regions in the United States and across the world. One of the biggest threats to native trout in the Nort ...
... and spread of non-native species. Historical fisheries management was often focused on diversifying fishing opportunities for anglers, resulting in the introduction of various species from other regions in the United States and across the world. One of the biggest threats to native trout in the Nort ...
EVOLUTION OF DIVARICATING PLANTS IN NEW ZEALAND IN
... they occurred in flocks (Falla, 1974). Nevertheless, in places where food supply was abundant it could be expected that moa numbers would have been relatively high. This is borne out by the carbon-dates from archaeological sites in the eastern South Island (Scarlett, 1974) which show that moa number ...
... they occurred in flocks (Falla, 1974). Nevertheless, in places where food supply was abundant it could be expected that moa numbers would have been relatively high. This is borne out by the carbon-dates from archaeological sites in the eastern South Island (Scarlett, 1974) which show that moa number ...
Aurelia aurita: the Moon Jelly
... In the case of A. aurita, over fishing of native pelagic fish has made establishment and success rates much higher (Richardson et al., 2009). Many of these removed fish species compete with the jellyfish for zooplankton, and often prey upon the polyps, ephyrae, and small medusae. Removing one of the ...
... In the case of A. aurita, over fishing of native pelagic fish has made establishment and success rates much higher (Richardson et al., 2009). Many of these removed fish species compete with the jellyfish for zooplankton, and often prey upon the polyps, ephyrae, and small medusae. Removing one of the ...
gilbert`s potoroo factsheet - WWF
... high rainfall areas of the South West Corner of WA, but was locally abundant in those areas. Early explorers and collectors such as John Gilbert documented that "immense numbers could be captured by aborigines in a single afternoon”. Nowadays, there are fewer than 40 of these marsupials in the wild. ...
... high rainfall areas of the South West Corner of WA, but was locally abundant in those areas. Early explorers and collectors such as John Gilbert documented that "immense numbers could be captured by aborigines in a single afternoon”. Nowadays, there are fewer than 40 of these marsupials in the wild. ...
A Basis for Relative Growth Rate Differences Between Native and
... invasive plants to achieve higher RGR than natives. The objective of this study was to determine the mechanistic basis for RGR differences between native and invasive forbs that are widely established on the nutrient-poor soils of the Intermountain West. Path analysis was used to identify the physio ...
... invasive plants to achieve higher RGR than natives. The objective of this study was to determine the mechanistic basis for RGR differences between native and invasive forbs that are widely established on the nutrient-poor soils of the Intermountain West. Path analysis was used to identify the physio ...
Behavioral responses of American toad and bullfrog - Gt-ibma
... OH 43023, USA e-mail: [email protected] ...
... OH 43023, USA e-mail: [email protected] ...
eports - University of Rhode Island
... and may be less affected by the prior settlement or close proximity of a competitor. We present the results of a meta-analysis assessing whether native/exotic status, consumer–host coevolutionary history, and spatiotemporal co-occurrence affect the strength of exploitative competition between herbiv ...
... and may be less affected by the prior settlement or close proximity of a competitor. We present the results of a meta-analysis assessing whether native/exotic status, consumer–host coevolutionary history, and spatiotemporal co-occurrence affect the strength of exploitative competition between herbiv ...
Chapter 3.0 Threats to Blanding`s Turtle - Documents
... Invasive species are animals and plants which are non-native species that can move into areas naturally but most often come to an area because of human introduction (either purposefully or by Dillon Consulting Limited ...
... Invasive species are animals and plants which are non-native species that can move into areas naturally but most often come to an area because of human introduction (either purposefully or by Dillon Consulting Limited ...
methods - San Francisco State University
... Parker et al. 1991). These extensive tidal marshes have now been reduced by more than 80% (95% in the Delta). Despite impacts from surrounding development, these remaining ecosystems are of critical regional importance for biodiversity, harboring a number of rare plant and animal species, including ...
... Parker et al. 1991). These extensive tidal marshes have now been reduced by more than 80% (95% in the Delta). Despite impacts from surrounding development, these remaining ecosystems are of critical regional importance for biodiversity, harboring a number of rare plant and animal species, including ...
plant species diversity in natural and managed forests of the pacific
... old) were clear-cut between 1972 and 1988 (Spies et al. 1994). During the same period, the portion of the landscape occupied by coniferous forest beyond the influence of clear-cut boundaries (assuming a 100-m edge effect) declined from -60 to 45%. Much of the pattern in today’s forested landscape re ...
... old) were clear-cut between 1972 and 1988 (Spies et al. 1994). During the same period, the portion of the landscape occupied by coniferous forest beyond the influence of clear-cut boundaries (assuming a 100-m edge effect) declined from -60 to 45%. Much of the pattern in today’s forested landscape re ...
Historical and ecological dimensions of global patterns
... woody plants, but not often enough to build diversity in temperate tree floras to the levels found in the tropics. Adaptive barriers may restrict lineages to more stressful, less productive environments as well as to the tropics. Many clades found only in temperate areas have diversified there but h ...
... woody plants, but not often enough to build diversity in temperate tree floras to the levels found in the tropics. Adaptive barriers may restrict lineages to more stressful, less productive environments as well as to the tropics. Many clades found only in temperate areas have diversified there but h ...
British Columbia Grasslands Monitoring Vegetation Change
... Information may be reproduced without permission subject to the fair dealing provision and the exceptions set out in the Canada Copyright Act, R.S., c. C-20, s. 1. The source of the work must be fully acknowledged. Information may not be redistributed or stored for the purpose of serving through any ...
... Information may be reproduced without permission subject to the fair dealing provision and the exceptions set out in the Canada Copyright Act, R.S., c. C-20, s. 1. The source of the work must be fully acknowledged. Information may not be redistributed or stored for the purpose of serving through any ...
Critical Habitat Survey for Threespine Stickleback Species Pairs
... These sympatric species of sticklebacks are known to have evolved independently (Taylor & McPhail 1999) in only five separate water drainages in the central Strait of Georgia region of coastal British Columbia in Canada: Enos Lake on Vancouver Island; the Vananda Creek drainage, including Priest Lak ...
... These sympatric species of sticklebacks are known to have evolved independently (Taylor & McPhail 1999) in only five separate water drainages in the central Strait of Georgia region of coastal British Columbia in Canada: Enos Lake on Vancouver Island; the Vananda Creek drainage, including Priest Lak ...
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 ...
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.