Ecosystem Approach to Marine Fisheries Management
... point in the medium term and ensuring that the limit reference point is never exceeded. In theory, it should be possible to apply reference points to any or all taxa in the ecosystem. ICES (2000) have contended that even if this was practical for a significant number of taxa, it may not ensure adequ ...
... point in the medium term and ensuring that the limit reference point is never exceeded. In theory, it should be possible to apply reference points to any or all taxa in the ecosystem. ICES (2000) have contended that even if this was practical for a significant number of taxa, it may not ensure adequ ...
report - DIGITAL.CSIC, el repositorio institucional
... 1993 and Holt 1997 for a related study of metacommunity dynamics of food webs in heterogeneous landscapes). However, habitat destruction may yield qualitatively new consequences when considering species that are embedded in an intricate web of ecological relationships (Nee et al. 1997). A few empiri ...
... 1993 and Holt 1997 for a related study of metacommunity dynamics of food webs in heterogeneous landscapes). However, habitat destruction may yield qualitatively new consequences when considering species that are embedded in an intricate web of ecological relationships (Nee et al. 1997). A few empiri ...
Food web structure and habitat loss
... critical values of habitat destruction, dc , at which a given species goes extinct. The inverse of such an extinction threshold could be considered as a measure of vulnerability to extinction due to habitat loss. In addition to the extinction threshold, the dependence of patch occupancy on habitat d ...
... critical values of habitat destruction, dc , at which a given species goes extinct. The inverse of such an extinction threshold could be considered as a measure of vulnerability to extinction due to habitat loss. In addition to the extinction threshold, the dependence of patch occupancy on habitat d ...
1.-Biodiversity - Lesmahagow High School
... By the end of the lesson you will be able to ….. • Define the word biome. • Name (at least) three different biomes. • Give two factors that influence the global distribution of biomes on earth. ...
... By the end of the lesson you will be able to ….. • Define the word biome. • Name (at least) three different biomes. • Give two factors that influence the global distribution of biomes on earth. ...
Effects of River Impoundment on Ecosystem Services
... et al. (2004), and classifications were assigned an estimated trophic position of 4 for piscivores, 3 for invertivores and omnivores, and 2 for primary consumers (e.g., algivores, herbivores, detritivores). A composite trophic position for the fishery as a whole for each year was calculated as the r ...
... et al. (2004), and classifications were assigned an estimated trophic position of 4 for piscivores, 3 for invertivores and omnivores, and 2 for primary consumers (e.g., algivores, herbivores, detritivores). A composite trophic position for the fishery as a whole for each year was calculated as the r ...
Annotated Literature Review
... name implies, it was imported over here and somehow made its way into the river system, and now has taken over. There are multiple ways that this fish may have got into the river, and that is probably where the research will start. They could have been introduced accidentally or intentionally, by so ...
... name implies, it was imported over here and somehow made its way into the river system, and now has taken over. There are multiple ways that this fish may have got into the river, and that is probably where the research will start. They could have been introduced accidentally or intentionally, by so ...
PowerPoint - Susan Schwinning
... species are weakly interacting either directly (through a feeding relationship) or indirectly (through feeding relationships once or twice removed). ...
... species are weakly interacting either directly (through a feeding relationship) or indirectly (through feeding relationships once or twice removed). ...
Biological Diversity - Punjab Biodiversity Board
... It is important to realize that biodiversity is not evenly distributed on the earth. Its distribution depends on climate, soils and the presence of other species. Some areas, like the tropics are biologically very rich areas whereas others like deserts or snow covered areas, harbour lesser number of ...
... It is important to realize that biodiversity is not evenly distributed on the earth. Its distribution depends on climate, soils and the presence of other species. Some areas, like the tropics are biologically very rich areas whereas others like deserts or snow covered areas, harbour lesser number of ...
Keep the Wild Alive (KWA) Species Cards
... What Eats Them: Wolves and bobcats both prey on whooping cranes, and ravens may eat whooping crane eggs or young chicks.Whooping cranes can protect themselves from these predators by standing out in deep marshes or by fighting back with their beaks. Habitat: Whoopers nest in wetlands, winter in mars ...
... What Eats Them: Wolves and bobcats both prey on whooping cranes, and ravens may eat whooping crane eggs or young chicks.Whooping cranes can protect themselves from these predators by standing out in deep marshes or by fighting back with their beaks. Habitat: Whoopers nest in wetlands, winter in mars ...
File
... Threats facing biodiversity What does this show? What is the biggest threat that biodiversity is facing? Is this the same in all regions? How has this changed over time? ...
... Threats facing biodiversity What does this show? What is the biggest threat that biodiversity is facing? Is this the same in all regions? How has this changed over time? ...
Our natural environment - Department of Conservation
... grazed, sustainability has become a focus for maintaining this predominantly indigenous habitat including tall and short tussock species, Pimelia, mingimingi (a small leaved shrub) and native brooms. The wildlife here features the rare black stilt / kakï, pipits and skylarks along with skinks, gecko ...
... grazed, sustainability has become a focus for maintaining this predominantly indigenous habitat including tall and short tussock species, Pimelia, mingimingi (a small leaved shrub) and native brooms. The wildlife here features the rare black stilt / kakï, pipits and skylarks along with skinks, gecko ...
Fishing Mortality - Measuring the Effects of Catch Shares
... The analysis includes data for the first four years of the Northeast Multispecies Sector Program (20102013). The average ratio of fishing mortality to FMSY declined slightly in the first year of the sector program from 86 percent in 2009 to 69 percent in 2010, but then it increased to 74 percent in ...
... The analysis includes data for the first four years of the Northeast Multispecies Sector Program (20102013). The average ratio of fishing mortality to FMSY declined slightly in the first year of the sector program from 86 percent in 2009 to 69 percent in 2010, but then it increased to 74 percent in ...
Predator Prey Agenda
... Northwest Territories (NWT). The potential for apparent competition or other interspecific effects makes this a complicated management challenge because two prey species are listed as Threatened under SARA (boreal caribou and wood bison; bison have been recently reassessed as Special Concern by COSE ...
... Northwest Territories (NWT). The potential for apparent competition or other interspecific effects makes this a complicated management challenge because two prey species are listed as Threatened under SARA (boreal caribou and wood bison; bison have been recently reassessed as Special Concern by COSE ...
Understand inter and intraspecific competition, mutualism and
... Know that Americas age structure diagram is reflective of an aging population, and that the growth rate of the global population has slowed in the last 40 years or so. Know the components of soil – humus, parent material, etc. Understand that humans, for a long time in our history, were hunter gathe ...
... Know that Americas age structure diagram is reflective of an aging population, and that the growth rate of the global population has slowed in the last 40 years or so. Know the components of soil – humus, parent material, etc. Understand that humans, for a long time in our history, were hunter gathe ...
Environmental Biology
... various forms. Energy comes in many forms such as heat, light, sound and electricity, and all have in common the capacity to do work. All forms of energy follow basic laws known as the Laws of Thermodynamics that determine how it can be used. The study of energy flow is important in determining limi ...
... various forms. Energy comes in many forms such as heat, light, sound and electricity, and all have in common the capacity to do work. All forms of energy follow basic laws known as the Laws of Thermodynamics that determine how it can be used. The study of energy flow is important in determining limi ...
Resource partitioning as determining factor in structuring fish
... overlap patterns within each of the spatial units. Patterns of niche overlap were calculated and statistically tested against null models using EcoSim 7.0. Null model proposes that niche overlap is statistically lower than expected interpreting that interspecific food partitioning might be occurring ...
... overlap patterns within each of the spatial units. Patterns of niche overlap were calculated and statistically tested against null models using EcoSim 7.0. Null model proposes that niche overlap is statistically lower than expected interpreting that interspecific food partitioning might be occurring ...
Impact of maximum sustainable yield on competitive community
... The above examples show that TMSY exists if species have similar biotic potentials, carrying capacities and competition coefficients and if they do not compete intensively. All of these conditions are hardly ever met in nature. With the difference among parameters increasing, TMSY may become smaller ...
... The above examples show that TMSY exists if species have similar biotic potentials, carrying capacities and competition coefficients and if they do not compete intensively. All of these conditions are hardly ever met in nature. With the difference among parameters increasing, TMSY may become smaller ...
Chapter 1 - Garland Science
... It depicts the terrestrial food web on St. Martin Island in the eastern Caribbean. Each circle in the picture represents a living or decaying species, or a group of like species, and the connecting lines show the food path – the species at the top end of any line consumes the species at the bottom e ...
... It depicts the terrestrial food web on St. Martin Island in the eastern Caribbean. Each circle in the picture represents a living or decaying species, or a group of like species, and the connecting lines show the food path – the species at the top end of any line consumes the species at the bottom e ...
Biodiversity and sporting enterprises
... conservation of game involves managing specific wildlife populations to produce sustainable harvestable surpluses with a financial value. With sound stewardship most activities undertaken in game management should deliver positive biodiversity benefits. Those who manage sporting enterprises invest h ...
... conservation of game involves managing specific wildlife populations to produce sustainable harvestable surpluses with a financial value. With sound stewardship most activities undertaken in game management should deliver positive biodiversity benefits. Those who manage sporting enterprises invest h ...
abstracts - Aberdeen Centre for Environmental Sustainability
... Hunting may represent an important revenue for rural communities, and hunting management may also have important effects on the ecosystems, by managing landscape, as well as the wildlife there (e.g. by increasing numbers of game species, or reducing those of potential predators through predator cont ...
... Hunting may represent an important revenue for rural communities, and hunting management may also have important effects on the ecosystems, by managing landscape, as well as the wildlife there (e.g. by increasing numbers of game species, or reducing those of potential predators through predator cont ...
project site summary
... the people and the vital importance of maintaining and benefiting from the islands natural resources: plants, animals, and ecosystems. This process of development is without a doubt an integral part of improvement for our local economy. However, a small developing nation like ours requires that we n ...
... the people and the vital importance of maintaining and benefiting from the islands natural resources: plants, animals, and ecosystems. This process of development is without a doubt an integral part of improvement for our local economy. However, a small developing nation like ours requires that we n ...
Overview of the Spanish fisheries in the Patagonian Shelf. ICES CM
... other possible approaches to stock assessment was reviewed. Environmental influences on CPUE were also investigated and spatial patterns of CPUE analysed. The data used for this analysis extend from the start of the fishery in the early 1980s to the present. The raw data derived from the project com ...
... other possible approaches to stock assessment was reviewed. Environmental influences on CPUE were also investigated and spatial patterns of CPUE analysed. The data used for this analysis extend from the start of the fishery in the early 1980s to the present. The raw data derived from the project com ...
Marine Resources Program Overview
... trawl nets and test the modification to ensure they reduced bycatch of eulachon. This work was instrumental in not only allowing the continuation of this important fishery while addressing conservation concerns for eulachon, but also contributed toward certification of the Oregon pink shrimp fishery ...
... trawl nets and test the modification to ensure they reduced bycatch of eulachon. This work was instrumental in not only allowing the continuation of this important fishery while addressing conservation concerns for eulachon, but also contributed toward certification of the Oregon pink shrimp fishery ...
2.71 mb pdf - Environmental Information Service
... the region inland from the ZambeziChobe floodplains. In Zambezi high flood years, flood waters extend into low-lying depressions in the woodlands, while heavy local rainfall results in drainage from the super-saturated mopane woodlands towards the floodplains (see Results section below). Since the o ...
... the region inland from the ZambeziChobe floodplains. In Zambezi high flood years, flood waters extend into low-lying depressions in the woodlands, while heavy local rainfall results in drainage from the super-saturated mopane woodlands towards the floodplains (see Results section below). Since the o ...
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.