ON THE ECOLOGY OF INVASIVE SPECIES, EXTINCTION
... Chapter one provides a brief overview of the three-decade progress of invasive mammal eradication on islands. I review the history of eradication techniques developed in New Zealand, and describe some recent successes in western Mexico and Galápagos that I have been part of over the past decade. Cha ...
... Chapter one provides a brief overview of the three-decade progress of invasive mammal eradication on islands. I review the history of eradication techniques developed in New Zealand, and describe some recent successes in western Mexico and Galápagos that I have been part of over the past decade. Cha ...
ON THE ECOLOGY OF INVASIVE SPECIES, EXTINCTION
... Chapter one provides a brief overview of the three-decade progress of invasive mammal eradication on islands. I review the history of eradication techniques developed in New Zealand, and describe some recent successes in western Mexico and Galápagos that I have been part of over the past decade. Cha ...
... Chapter one provides a brief overview of the three-decade progress of invasive mammal eradication on islands. I review the history of eradication techniques developed in New Zealand, and describe some recent successes in western Mexico and Galápagos that I have been part of over the past decade. Cha ...
What`s depleting Salmon Populations?
... them to travel than in cooler years. In addition to a delayed return to their spawning grounds, many of the fish experience reduced body size since more energy is required to cover the longer di ...
... them to travel than in cooler years. In addition to a delayed return to their spawning grounds, many of the fish experience reduced body size since more energy is required to cover the longer di ...
Impacts of Invasive Species on Food Webs: A Review of Empirical
... algorithms are now available to measure such variables, and undertake crossnetwork comparisons. The limiting step remains the acquisition of data; a challenging and resource consuming task, which explains the small number of empirical studies of invasion into food webs. In addition the available net ...
... algorithms are now available to measure such variables, and undertake crossnetwork comparisons. The limiting step remains the acquisition of data; a challenging and resource consuming task, which explains the small number of empirical studies of invasion into food webs. In addition the available net ...
Pickled Fish Anyone?
... in the northern hemisphere (Amarasinghea and Welcomme 2002), but less so in New Zealand (Collier et al. 1990). In Southeast Asia, the black water systems are also of Holocene origin (Wüst et al. 2007), but are characterized by only slightly lower species diversity (Beamish et al. 2003). Considering ...
... in the northern hemisphere (Amarasinghea and Welcomme 2002), but less so in New Zealand (Collier et al. 1990). In Southeast Asia, the black water systems are also of Holocene origin (Wüst et al. 2007), but are characterized by only slightly lower species diversity (Beamish et al. 2003). Considering ...
Full text in pdf format
... ABSTRACT An experimental study of the effects of otter trawling was conducted in a deep (120 to 146 m) sandy bottom ecosystem of the Grand Banks of Newfoundland from 1993 to 1995. Each year, three 13 km long corridors were trawled 12 times within 31 to 34 h with an Engel 145 otter trawl equipped \nt ...
... ABSTRACT An experimental study of the effects of otter trawling was conducted in a deep (120 to 146 m) sandy bottom ecosystem of the Grand Banks of Newfoundland from 1993 to 1995. Each year, three 13 km long corridors were trawled 12 times within 31 to 34 h with an Engel 145 otter trawl equipped \nt ...
Biodiversity Conservation, Ecosystem Functioning, and Economic
... trade-offs between biodiversity loss and agricultural intensification (Perfecto et al. 2005; Steffan-Dewenter et al. 2007). Conversely, O’Brien and Kinnaird (2003) and Rappole et al. (2003a, 2003b) suggest that intensification conserves biodiversity by minimizing the demand for natural habitat. Neve ...
... trade-offs between biodiversity loss and agricultural intensification (Perfecto et al. 2005; Steffan-Dewenter et al. 2007). Conversely, O’Brien and Kinnaird (2003) and Rappole et al. (2003a, 2003b) suggest that intensification conserves biodiversity by minimizing the demand for natural habitat. Neve ...
Evolutionary and ecological constraints of fish spawning habitats
... To successfully breed, individuals of the opposite sex must first encounter each other. This need is probably most acute in nonschooling, rare or low abundance fish species. A classic example of a reproductive strategy developed as a result of constraints on mate encounters is that of the deep-sea a ...
... To successfully breed, individuals of the opposite sex must first encounter each other. This need is probably most acute in nonschooling, rare or low abundance fish species. A classic example of a reproductive strategy developed as a result of constraints on mate encounters is that of the deep-sea a ...
Annual Reviews of Ecology, Evolution and Systematics
... MacArthur et al. 1972). A large number of papers have examined this phenomenon (summarized by Faeth 1984, Wright 1980), and have sought to explain why in some cases aggregate densities were lower (density undercompensation) or higher (density overcompensation) on islands when compared with equivalen ...
... MacArthur et al. 1972). A large number of papers have examined this phenomenon (summarized by Faeth 1984, Wright 1980), and have sought to explain why in some cases aggregate densities were lower (density undercompensation) or higher (density overcompensation) on islands when compared with equivalen ...
Biotic factors in amphibian population declines - Amphibia
... Amphibians have evolved and continue to exist in habitats that are replete with many other organisms. Some of these organisms serye as prey for amphibians, while others interact with amphibians as predators, competitors, pathogens, or symbionts. Still other organisms have no observable relationship ...
... Amphibians have evolved and continue to exist in habitats that are replete with many other organisms. Some of these organisms serye as prey for amphibians, while others interact with amphibians as predators, competitors, pathogens, or symbionts. Still other organisms have no observable relationship ...
Mexico - Seafood Watch
... The Safina Center (formerly Blue Ocean Institute) translates scientific information into language people can understand and serves as a unique voice of hope, guidance, and encouragement. The Safina Center (TSC) works through science, art, and literature to inspire solutions and a deeper connection w ...
... The Safina Center (formerly Blue Ocean Institute) translates scientific information into language people can understand and serves as a unique voice of hope, guidance, and encouragement. The Safina Center (TSC) works through science, art, and literature to inspire solutions and a deeper connection w ...
Chapter 6 student notes
... • The condition of the air affects people’s health. • Smog is a mixture of chemicals that occurs as a graybrown haze in the atmosphere. • Smog is: – due to automobile exhausts and industrial emissions. – considered a pollutant because it threatens people’s health. ...
... • The condition of the air affects people’s health. • Smog is a mixture of chemicals that occurs as a graybrown haze in the atmosphere. • Smog is: – due to automobile exhausts and industrial emissions. – considered a pollutant because it threatens people’s health. ...
“The History And Future Of Island Conservation In A Snail Shell”
... often only assess ecosystems after a period of decline (Pauly, 1995). This means that any assessment of threat is made from already degraded systems, underestimating the true threat or loss incurred. To rectify this there are now a number of methods being used to estimate the historic abundance or r ...
... often only assess ecosystems after a period of decline (Pauly, 1995). This means that any assessment of threat is made from already degraded systems, underestimating the true threat or loss incurred. To rectify this there are now a number of methods being used to estimate the historic abundance or r ...
An appraisal of stocking strategies in the light of
... fish; whether the fish to be stocked should be preconditioned or acclimatized; the handling and transportation of fish to the stocking site; the stocking densities; the age or size of the stock; the timing of stocking; and the mechanisms of release. All these aspects must be taken into account at th ...
... fish; whether the fish to be stocked should be preconditioned or acclimatized; the handling and transportation of fish to the stocking site; the stocking densities; the age or size of the stock; the timing of stocking; and the mechanisms of release. All these aspects must be taken into account at th ...
ECOSYSTEM FUNCTION, PRINCIPLES OF
... organized in a hierarchy of increasing levels of organization and complexity: individual, population, species, community, ecosystem, landscape, and biome. The size (scale) of an ecosystem is defined by the purposes of the study. Ecosystems may have distinct boundaries as in the case of a lake or a wa ...
... organized in a hierarchy of increasing levels of organization and complexity: individual, population, species, community, ecosystem, landscape, and biome. The size (scale) of an ecosystem is defined by the purposes of the study. Ecosystems may have distinct boundaries as in the case of a lake or a wa ...
Seasonal succession in fishless ponds: effects
... Size-selective predation by fish is often considered to be a primary driver of seasonal declines in large-bodied Daphnia populations. However, large Daphnia commonly exhibit midsummer extinctions in ponds lacking planktivorous fish. A number of empirical and theoretical studies suggest that resource ...
... Size-selective predation by fish is often considered to be a primary driver of seasonal declines in large-bodied Daphnia populations. However, large Daphnia commonly exhibit midsummer extinctions in ponds lacking planktivorous fish. A number of empirical and theoretical studies suggest that resource ...
Weasel - Ministry of Environment
... MORTALITY, PARASITES AND DISEASE The high reproductive rate of weasels is necessary because they also have high death rates. Four-year-old least weasels and ermines have been documented, but few attain that age in the wild and the average life expectancy after independence for both species is less t ...
... MORTALITY, PARASITES AND DISEASE The high reproductive rate of weasels is necessary because they also have high death rates. Four-year-old least weasels and ermines have been documented, but few attain that age in the wild and the average life expectancy after independence for both species is less t ...
2008snail
... coordinate with the agencies or individuals responsible for the collection and propagation of that snail to ensure a healthy and balanced genetic composition. It must be determined if the reintroduction of snails will be augmenting numbers at an existing population or creating a new one. In addition ...
... coordinate with the agencies or individuals responsible for the collection and propagation of that snail to ensure a healthy and balanced genetic composition. It must be determined if the reintroduction of snails will be augmenting numbers at an existing population or creating a new one. In addition ...
Effects of resource abundance on habitat selection and spatial
... 2001; MCDONALD and ST CLAIR 2004) have been used. These studies have contributed significantly to the understanding of small mammal biology, however there are some important methodological drawbacks that should be taken into consideration when using these methods, and which leave room for improvemen ...
... 2001; MCDONALD and ST CLAIR 2004) have been used. These studies have contributed significantly to the understanding of small mammal biology, however there are some important methodological drawbacks that should be taken into consideration when using these methods, and which leave room for improvemen ...
Biodiversity in a Changing World
... The threats facing Ontario’s plant and animal species are constantly increasing. However, there are five main threats that are impacting all species across Ontario, pollution, habitat loss, invasive species, unsustainable use and climate change. Pollution of the natural ecosystems includes contamina ...
... The threats facing Ontario’s plant and animal species are constantly increasing. However, there are five main threats that are impacting all species across Ontario, pollution, habitat loss, invasive species, unsustainable use and climate change. Pollution of the natural ecosystems includes contamina ...
Shark Biology and Conservation
... and manatees. Also, chronic over fishing Loss of algae eating fishes on coral reefs resulted in rise of the spiny sea urchin Diadema as main herbivore in this habitat. Early 1980’s disease wipes out over 90% of the Diadema in the Caribbean. ...
... and manatees. Also, chronic over fishing Loss of algae eating fishes on coral reefs resulted in rise of the spiny sea urchin Diadema as main herbivore in this habitat. Early 1980’s disease wipes out over 90% of the Diadema in the Caribbean. ...
Biomass and Abundance of Herbivorous Fishes on Coral Reefs off
... If grazing by reef fishes is reduced due to overfishing, macroalgae can outcompete corals by colonising space and thereby inhibiting coral growth and recruitment (Hughes 1989; Tanner 1995; Knowlton 2001). Macroalgae also affect coral health indirectly by stimulating pathogenic microbes associated wi ...
... If grazing by reef fishes is reduced due to overfishing, macroalgae can outcompete corals by colonising space and thereby inhibiting coral growth and recruitment (Hughes 1989; Tanner 1995; Knowlton 2001). Macroalgae also affect coral health indirectly by stimulating pathogenic microbes associated wi ...
CONSERVATION AREA MANAGEMENT
... All SCAs should be coded as Stand Condition 8 in Operations Inventory. This will provide a single location to document conservation elements in the inventory. High Conservation Value Areas (HCVAs): areas that have been recognized for their contribution to specific conservation values, objectives and ...
... All SCAs should be coded as Stand Condition 8 in Operations Inventory. This will provide a single location to document conservation elements in the inventory. High Conservation Value Areas (HCVAs): areas that have been recognized for their contribution to specific conservation values, objectives and ...
Overexploitation
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Sustained overexploitation can lead to the destruction of the resource. The term applies to natural resources such as: wild medicinal plants, grazing pastures, game animals, fish stocks, forests, and water aquifers.In ecology, overexploitation describes one of the five main activities threatening global biodiversity. Ecologists use the term to describe populations that are harvested at a rate that is unsustainable, given their natural rates of mortality and capacities for reproduction. This can result in extinction at the population level and even extinction of whole species. In conservation biology the term is usually used in the context of human economic activity that involves the taking of biological resources, or organisms, in larger numbers than their populations can withstand. The term is also used and defined somewhat differently in fisheries, hydrology and natural resource management.Overexploitation can lead to resource destruction, including extinctions. However it is also possible for overexploitation to be sustainable, as discussed below in the section on fisheries. In the context of fishing, the term overfishing can be used instead of overexploitation, as can overgrazing in stock management, overlogging in forest management, overdrafting in aquifer management, and endangered species in species monitoring. Overexploitation is not an activity limited to humans. Introduced predators and herbivores, for example, can overexploit native flora and fauna.