English
... diversity data has accumulated dramatically during the last 20 years and is now available for many species at many sites. Some species have been measured at more than one time during the recent past, allowing change detection. Single time-point data can also be used to infer past demographic traject ...
... diversity data has accumulated dramatically during the last 20 years and is now available for many species at many sites. Some species have been measured at more than one time during the recent past, allowing change detection. Single time-point data can also be used to infer past demographic traject ...
studies on the ecology and population biology
... Citations in previous footnotes indicate that the situation has improved in the last 30 years, although we still know little or nothing about most South American anole species. ...
... Citations in previous footnotes indicate that the situation has improved in the last 30 years, although we still know little or nothing about most South American anole species. ...
Final Report - The Darwin Initiative
... Vortex predictions of persistence of the three mangrove finch populations for 100 years. The main threat to the Mangrove Finch’s survival comes from high mortality of eggs and fledglings due to rat predation and Philornis downsi parasitism, factors that can be controlled by direct actions. After in ...
... Vortex predictions of persistence of the three mangrove finch populations for 100 years. The main threat to the Mangrove Finch’s survival comes from high mortality of eggs and fledglings due to rat predation and Philornis downsi parasitism, factors that can be controlled by direct actions. After in ...
On the organization of ecosystems Veldhuis, Michiel
... this loop by adding an earthworm species (D) that consumes the litter and through fragmentation and mixing of litter stimulates bacterial growth (Fig. 1C). Note that this autocatalytic loop of species (that all profit from each other) is not solely based on predator-prey interactions and contains th ...
... this loop by adding an earthworm species (D) that consumes the litter and through fragmentation and mixing of litter stimulates bacterial growth (Fig. 1C). Note that this autocatalytic loop of species (that all profit from each other) is not solely based on predator-prey interactions and contains th ...
Redalyc.A review of the conservation status of Australian mammals
... Results and Discussion: Extinctions have occurred at a more or less consistent rate of one to two species per decade since the 1840s, with that rate continuing unabated. A further 55 species from that original fauna are now threatened, and an additional 42 are Near Threatened. Although many factors ...
... Results and Discussion: Extinctions have occurred at a more or less consistent rate of one to two species per decade since the 1840s, with that rate continuing unabated. A further 55 species from that original fauna are now threatened, and an additional 42 are Near Threatened. Although many factors ...
Drift fences, coverboards, and other traps
... Many of the simplest yet most highly productive sampling methods in herpetological field research use some type of trap or attraction device to increase capture rates or target secretive species. These techniques fall into two general categories: those that actually trap animals, accumulating captur ...
... Many of the simplest yet most highly productive sampling methods in herpetological field research use some type of trap or attraction device to increase capture rates or target secretive species. These techniques fall into two general categories: those that actually trap animals, accumulating captur ...
Spatiotemporal variations in aphidparasitoid relative abundance
... exploit (Henry et al. 2008). Therefore, one can expect the specific composition of the community of hosts and their relative abundance to be a major factor explaining the relative abundances of parasitoids. Presumably, a high variance in the availability and the quality of host resources would be fa ...
... exploit (Henry et al. 2008). Therefore, one can expect the specific composition of the community of hosts and their relative abundance to be a major factor explaining the relative abundances of parasitoids. Presumably, a high variance in the availability and the quality of host resources would be fa ...
Environmental heterogeneity, species diversity and
... animal species relationship and found negative HDR in some cases. They proposed that heterogeneous vegetation cover might provide different niches for some species, while leading to habitat fragmentation for others. Habitat fragmentation inhibits both individual fitness and population dynamics due to ...
... animal species relationship and found negative HDR in some cases. They proposed that heterogeneous vegetation cover might provide different niches for some species, while leading to habitat fragmentation for others. Habitat fragmentation inhibits both individual fitness and population dynamics due to ...
Full text in pdf format
... ABSTRACT: Three aspects of the study of effects of pollution in marine systems are discussed. First is the evaluation of relative sensitivities and reliabilities of different methods of detecting pollution, includ~nga brief contrast of processes operating in mesocosms and in the field. Second is the ...
... ABSTRACT: Three aspects of the study of effects of pollution in marine systems are discussed. First is the evaluation of relative sensitivities and reliabilities of different methods of detecting pollution, includ~nga brief contrast of processes operating in mesocosms and in the field. Second is the ...
Grade 7 Life Posttest
... produce insulin, a human insulin gene is inserted into bacterial DNA. The bacteria that contain the DNA then produce insulin. What has been a major impact of the genetic engineering of insulin? A. Humans began to lose their ability to produce insulin. B. Medicines became less effective because they ...
... produce insulin, a human insulin gene is inserted into bacterial DNA. The bacteria that contain the DNA then produce insulin. What has been a major impact of the genetic engineering of insulin? A. Humans began to lose their ability to produce insulin. B. Medicines became less effective because they ...
The Role of Hybrid Vigor in the Replacement of
... Unfortunately, the mechanisms that promote or retard gene flow between divergent populations are little studied and poorly understood. Like many imperiled fish species, the Pecos pupfish (Cyprinodon pecosensis) is threatened with replacement by its hybrids with a close congener. We examined swimming ...
... Unfortunately, the mechanisms that promote or retard gene flow between divergent populations are little studied and poorly understood. Like many imperiled fish species, the Pecos pupfish (Cyprinodon pecosensis) is threatened with replacement by its hybrids with a close congener. We examined swimming ...
04_chapter 1
... The land use pattern variations over past few decades have alarmingly altered the environment for all the inhabitants including humans. The anthropogenic activities further modified it consequently resulting into intense degradation making it conspicuously unsuitable for the animals. The studies on ...
... The land use pattern variations over past few decades have alarmingly altered the environment for all the inhabitants including humans. The anthropogenic activities further modified it consequently resulting into intense degradation making it conspicuously unsuitable for the animals. The studies on ...
Vol. 127, No. 3 The American Naturalist March 1986 SPECIES
... quadramaculatus, the most aquatic and largest species; D. monticola, a streambank species sometimes found in the forest; and D. ochrophaeus, the smallest and most terrestrial of the three. In some areas, a fourth species, more terrestrial than D. ochrophaeus, is found. This is either D. wrighti, fou ...
... quadramaculatus, the most aquatic and largest species; D. monticola, a streambank species sometimes found in the forest; and D. ochrophaeus, the smallest and most terrestrial of the three. In some areas, a fourth species, more terrestrial than D. ochrophaeus, is found. This is either D. wrighti, fou ...
Progress in Physical Geography
... rates of angiosperm diversification in the tropics. Diversification is not only present at the species level but also at higher taxonomic levels such as the family and genus (Chown and Gaston, 2000). This lends credence to a long time-frame of evolutionary change. Primitive tree species that are com ...
... rates of angiosperm diversification in the tropics. Diversification is not only present at the species level but also at higher taxonomic levels such as the family and genus (Chown and Gaston, 2000). This lends credence to a long time-frame of evolutionary change. Primitive tree species that are com ...
the Dark Side of Black Bass
... that is positioned close to blacknose dace, pearl dace, and fathead minnow. In general, the pattern along Axis 1 is one progressing from small-bodied species at the left end towards species of increasing body size and piscivorous diets at the right end. The PCoA of the lakes (Figure 4) shows a stron ...
... that is positioned close to blacknose dace, pearl dace, and fathead minnow. In general, the pattern along Axis 1 is one progressing from small-bodied species at the left end towards species of increasing body size and piscivorous diets at the right end. The PCoA of the lakes (Figure 4) shows a stron ...
Leopardus jacobita, Andean Cat
... scats found at latrine sites near rocky areas and caves (Cossios et al. 2007, Walker et al. 2007, Napolitano et al. 2008). The Andean Cat is perhaps a solitary species, but may be seen in pairs or with cubs during mating season and after births respectively (Villalba et al. 2004). Mating season, acc ...
... scats found at latrine sites near rocky areas and caves (Cossios et al. 2007, Walker et al. 2007, Napolitano et al. 2008). The Andean Cat is perhaps a solitary species, but may be seen in pairs or with cubs during mating season and after births respectively (Villalba et al. 2004). Mating season, acc ...
Extinctions in Ecological Communities – Alva Curtsdotter
... understanding extinction processes and what determines the magnitude of species loss, has become only too relevant. The number of known extinctions (~850) during the last centuries translates to extinction rates elevated above the background rate, matching those of previous mass extinction events. T ...
... understanding extinction processes and what determines the magnitude of species loss, has become only too relevant. The number of known extinctions (~850) during the last centuries translates to extinction rates elevated above the background rate, matching those of previous mass extinction events. T ...
Competitive avoidance not edaphic specialization drives vertical
... The sympatric distribution, close evolutionary relationship, and obligate reliance upon a single host species suggest that high levels of competition may be present between these two species. However, the relatively equal abundances of the two species at a single site suggest that these species may ...
... The sympatric distribution, close evolutionary relationship, and obligate reliance upon a single host species suggest that high levels of competition may be present between these two species. However, the relatively equal abundances of the two species at a single site suggest that these species may ...
DEFORESTATION PATTERNS AND HUMMINGBIRD DIvERSITy IN
... occupy a wide niche are in turn called generalists (Boulangeat et al., 2012). Generalist species have a tendency to successfully adapt to environments modified by land-use change and establish in new habitats (Ducatez et al., 2015). Specialists are considered to experience a higher risk of extinctio ...
... occupy a wide niche are in turn called generalists (Boulangeat et al., 2012). Generalist species have a tendency to successfully adapt to environments modified by land-use change and establish in new habitats (Ducatez et al., 2015). Specialists are considered to experience a higher risk of extinctio ...
red swamp crayfish
... sediment and lay eggs. The number of eggs varies with the size of the female, with large crayfish laying as many as 650 eggs at a time. They are tolerant of fluctuating water levels and can survive long dry spells by remaining in burrows or crawling over land to other water sources. ...
... sediment and lay eggs. The number of eggs varies with the size of the female, with large crayfish laying as many as 650 eggs at a time. They are tolerant of fluctuating water levels and can survive long dry spells by remaining in burrows or crawling over land to other water sources. ...
Cyanopsitta Magazine.. - Loro Parque Fundación
... Now we have moved into the International Year of Forests, also officially declared by the United Nations. The article on the opposite page gives a few of the many statistics associated with forests, and there is no doubt that they constitute the major repository of life on the planet. Some areas of ...
... Now we have moved into the International Year of Forests, also officially declared by the United Nations. The article on the opposite page gives a few of the many statistics associated with forests, and there is no doubt that they constitute the major repository of life on the planet. Some areas of ...
Inglés
... Results and Discussion: Extinctions have occurred at a more or less consistent rate of one to two species per decade since the 1840s, with that rate continuing unabated. A further 55 species from that original fauna are now threatened, and an additional 42 are Near Threatened. Although many factors ...
... Results and Discussion: Extinctions have occurred at a more or less consistent rate of one to two species per decade since the 1840s, with that rate continuing unabated. A further 55 species from that original fauna are now threatened, and an additional 42 are Near Threatened. Although many factors ...
Chapter 54
... • Dominant species are those that are most abundant or have the highest biomass • Biomass is the total mass of all individuals in a population • Dominant species exert powerful control over the occurrence and distribution of other species ...
... • Dominant species are those that are most abundant or have the highest biomass • Biomass is the total mass of all individuals in a population • Dominant species exert powerful control over the occurrence and distribution of other species ...
Island restoration
The ecological restoration of islands, or island restoration, is the application of the principles of ecological restoration to islands and island groups. Islands, due to their isolation, are home to many of the world's endemic species, as well as important breeding grounds for seabirds and some marine mammals. Their ecosystems are also very vulnerable to human disturbance and particularly to introduced species, due to their small size. Island groups such as New Zealand and Hawaii have undergone substantial extinctions and losses of habitat. Since the 1950s several organisations and government agencies around the world have worked to restore islands to their original states; New Zealand has used them to hold natural populations of species that would otherwise be unable to survive in the wild. The principal components of island restoration are the removal of introduced species and the reintroduction of native species.