(Galaxias fuscus) for conservation purposes
... Ne : Effective population size. The number of individuals which are effectively participating in breeding and the successful production of offspring; invariably this number is lower than the estimated number of animals in the population (N). Re-introduction: The deliberate or accidental translocatio ...
... Ne : Effective population size. The number of individuals which are effectively participating in breeding and the successful production of offspring; invariably this number is lower than the estimated number of animals in the population (N). Re-introduction: The deliberate or accidental translocatio ...
appendix w5 - Department of Water Affairs
... Marginal/Low rating=1; The floodplain falls within a Municipal nature reserve or some other category of protected status that reflects its importance for the conservation of ecological diversity a local scale. Very low rating=0; The floodplain does not fall within any category of protected status th ...
... Marginal/Low rating=1; The floodplain falls within a Municipal nature reserve or some other category of protected status that reflects its importance for the conservation of ecological diversity a local scale. Very low rating=0; The floodplain does not fall within any category of protected status th ...
The Revolution of Science through Scuba
... reefs, Sphyraena barracuda are known to swim above and behind divers—a commonly noted behavior (C. Birkeland, J. Witman, unpublished observations). These barracuda would not be recorded by a forward-facing camera system, which could lead to large underestimates of population densities. Studies of ...
... reefs, Sphyraena barracuda are known to swim above and behind divers—a commonly noted behavior (C. Birkeland, J. Witman, unpublished observations). These barracuda would not be recorded by a forward-facing camera system, which could lead to large underestimates of population densities. Studies of ...
Mullus barbatus Lipid reserves of red mullet ( ) during
... SUMMARY: Lipid reserves are a particularly important attribute of fishes because they have a large influence on growth, reproduction and survival. This study analyses the lipid content of red mullet (Mullus barbatus) pre-spawners in three different areas of the northwestern Mediterranean in relation ...
... SUMMARY: Lipid reserves are a particularly important attribute of fishes because they have a large influence on growth, reproduction and survival. This study analyses the lipid content of red mullet (Mullus barbatus) pre-spawners in three different areas of the northwestern Mediterranean in relation ...
Are there real differences among aquatic and terrestrial food webs?
... For example, Strong et al.20 provided evidence for a strong towards freshwater lake ecosystems, evidence from both species-level trophic cascade that extended to an abunstream17 and marine18 ecosystems show similar patterns. dant nitrogen-fixing shrub in a simple dune ecosystem. Similarly, Spiller a ...
... For example, Strong et al.20 provided evidence for a strong towards freshwater lake ecosystems, evidence from both species-level trophic cascade that extended to an abunstream17 and marine18 ecosystems show similar patterns. dant nitrogen-fixing shrub in a simple dune ecosystem. Similarly, Spiller a ...
... seed-only restoration plot had very low cover of prairie species (22%) relative to the mean in other seed-only restoration plots (55%) and a very high weed stem number; it was also a significant outlier in the analysis of total weed stem number (outlier tstatistic = 3.16, P = 0.0046). Uneven terrain ...
Section 1.1 Silence of the Frogs
... Problem Scientists are noticing a decline in frog populations and the # of species of frogs. Over 30% of North American frog species are in trouble! Question Why are scientists concerned about frogs? ...
... Problem Scientists are noticing a decline in frog populations and the # of species of frogs. Over 30% of North American frog species are in trouble! Question Why are scientists concerned about frogs? ...
1 Ecosystem Services and the Economics of
... rather than on the existence of one or a few species. Historically, individual species have tended to be managed to satisfy demand for particular foods, fuels, fibers, or medicinal compounds or because they have totemic, spiritual, or amenity value. The MA drew attention to the disproportionate bene ...
... rather than on the existence of one or a few species. Historically, individual species have tended to be managed to satisfy demand for particular foods, fuels, fibers, or medicinal compounds or because they have totemic, spiritual, or amenity value. The MA drew attention to the disproportionate bene ...
Physical factors affecting the relative abundance
... the Gulf of St. Lawrence in the north Atlantic Ocean. Along its course, the river undergoes multiple changes in width, depth, current velocity, climatic condition, and shoreline topography. It encompasses fluvial lakes and islands and is joined by several smaller rivers, with the largest being the O ...
... the Gulf of St. Lawrence in the north Atlantic Ocean. Along its course, the river undergoes multiple changes in width, depth, current velocity, climatic condition, and shoreline topography. It encompasses fluvial lakes and islands and is joined by several smaller rivers, with the largest being the O ...
Biodiversity and Ecosystem Functioning - annurev-ecolsys
... Huston (1997) suggested that biodiversity was not the actual cause of greater stability in high-diversity plots following drought (Tilman 1996, Tilman & Downing 1994), nor of greater productivity in the foodweb experiment (Naeem et al. 1994, 1995), nor of greater productivity and greater use of soil ...
... Huston (1997) suggested that biodiversity was not the actual cause of greater stability in high-diversity plots following drought (Tilman 1996, Tilman & Downing 1994), nor of greater productivity in the foodweb experiment (Naeem et al. 1994, 1995), nor of greater productivity and greater use of soil ...
Red Herrings - Greenpeace USA
... 2 For example, Auster, P.J. and R.W. Langton (1999). The effects of fishing on fish habitat. pp 150-187 in L.R. Benaka, ed. Fish habitat: essential fish habitat and rehabilitation. American Fisheries Society, Bethesda, Maryland (USA); Barnette, M.C. (1999). Gulf of Mexico fishing gear and their pote ...
... 2 For example, Auster, P.J. and R.W. Langton (1999). The effects of fishing on fish habitat. pp 150-187 in L.R. Benaka, ed. Fish habitat: essential fish habitat and rehabilitation. American Fisheries Society, Bethesda, Maryland (USA); Barnette, M.C. (1999). Gulf of Mexico fishing gear and their pote ...
OKATIBBEE LAKE PASCAGOULA RIVER, MISSISSIPPI DESIGN
... There is seasonal variation, with about 50 percent of the precipitation occurring' during the wet period (December through April) and only about 24 percent occurring during the dry period (August through November). Flood-producing storms may occur over the Okatibbee basin at any time during the year ...
... There is seasonal variation, with about 50 percent of the precipitation occurring' during the wet period (December through April) and only about 24 percent occurring during the dry period (August through November). Flood-producing storms may occur over the Okatibbee basin at any time during the year ...
E English Case Study Trondheimsfjord
... name from the "fishing rod" on its head, with which it lures its prey. The species was almost unattended in Norway until for 15-20 years ago. At that time it became a popular restaurant food and gave a good income for the fishermen. Old and very large individuals were caught in the beginning. Specim ...
... name from the "fishing rod" on its head, with which it lures its prey. The species was almost unattended in Norway until for 15-20 years ago. At that time it became a popular restaurant food and gave a good income for the fishermen. Old and very large individuals were caught in the beginning. Specim ...
The consumption of commercially valuable fish by pinnipeds in
... Fisheries are one of the most valuable exports for Iceland. In order to protect valuable fish stocks, it is necessary to understand their ecological context. Interspecific competition between humans and pinnipeds for commercially valuable fish requires consideration when managing fisheries and marin ...
... Fisheries are one of the most valuable exports for Iceland. In order to protect valuable fish stocks, it is necessary to understand their ecological context. Interspecific competition between humans and pinnipeds for commercially valuable fish requires consideration when managing fisheries and marin ...
Effects of body size and resource availability on
... californica Haldeman (native) and Batillaria attramentaria Sowerby (non-indigenous) to investigate how resource levels set by intraspecific competition may influence dispersal rates. I used two distinct size classes of the snails (mature and immature) to determine if the effects of competition on di ...
... californica Haldeman (native) and Batillaria attramentaria Sowerby (non-indigenous) to investigate how resource levels set by intraspecific competition may influence dispersal rates. I used two distinct size classes of the snails (mature and immature) to determine if the effects of competition on di ...
Return of the Vultures
... programme and vulture safe zones, which are areas of high awareness activity, zero diclofenac tolerance and where old cows are farmed as an eventual, clean vulture food source. SAVE made a major breakthrough in 2012 when the governments of Bangladesh, India, Nepal and Pakistan made a regional declar ...
... programme and vulture safe zones, which are areas of high awareness activity, zero diclofenac tolerance and where old cows are farmed as an eventual, clean vulture food source. SAVE made a major breakthrough in 2012 when the governments of Bangladesh, India, Nepal and Pakistan made a regional declar ...
Effects of predator richness on prey suppression: a metaanalysis
... changing levels of biodiversity across nearly all of Earth’s ecosystems (Naeem et al. 2012). Predators are known to be disproportionately prone to anthropogenic extinction compared to other trophic groups (Terborgh et al. 2001), and the ecosystem-level consequences of losing entire predator guilds o ...
... changing levels of biodiversity across nearly all of Earth’s ecosystems (Naeem et al. 2012). Predators are known to be disproportionately prone to anthropogenic extinction compared to other trophic groups (Terborgh et al. 2001), and the ecosystem-level consequences of losing entire predator guilds o ...
Conserving biodiversity and combating desertification: Achieving
... the determinants of the two problems better suited to the present situation and knowledge status? `Are there shared determinants of biodiversity decline and desertification in the Northern Mediterranean? ...
... the determinants of the two problems better suited to the present situation and knowledge status? `Are there shared determinants of biodiversity decline and desertification in the Northern Mediterranean? ...
Energy budget and ecological role of mangrove epibenthos in the
... rapax and U. vocator. The large creek stratum was strongly dominated by the fiddler crab U. maracoani, while in the small creek 4 species (Uca cumulanta, U. maracoani, Pachygrapsus gracilis and Eurytium limosum) contributed similar quantities to total biomass. Per area somatic production (P) and res ...
... rapax and U. vocator. The large creek stratum was strongly dominated by the fiddler crab U. maracoani, while in the small creek 4 species (Uca cumulanta, U. maracoani, Pachygrapsus gracilis and Eurytium limosum) contributed similar quantities to total biomass. Per area somatic production (P) and res ...
State of the Eastern Scotian Shelf Ecosystem
... and the population may have doubled since the last survey in 1997 to near 225,000 in 2002. It is not yet possible to predict how long the current situation will persist and whether or not the system will return to its previous groundfish-dominated state. ...
... and the population may have doubled since the last survey in 1997 to near 225,000 in 2002. It is not yet possible to predict how long the current situation will persist and whether or not the system will return to its previous groundfish-dominated state. ...
Human acceleration of animal and plant extinctions: A Late
... currently living through a mass extinction event. Calculations suggest that the current rates of extinction are 100–1000 times natural background levels (Vitousek et al., 1997b:498; Wilson, 2002). Some biologists predict that the sixth extinction may result in a 50% loss of the remaining plants and ...
... currently living through a mass extinction event. Calculations suggest that the current rates of extinction are 100–1000 times natural background levels (Vitousek et al., 1997b:498; Wilson, 2002). Some biologists predict that the sixth extinction may result in a 50% loss of the remaining plants and ...
Megafauna and ecosystem function from the
... Fig. 1 maps the deficit in current megafaunal diversity compared with what would be expected if Late Pleistocene species had survived to the present (44). Loss has been most dramatic in the megaherbivores and megacarnivores. The Late Pleistocene harbored at least 50 species of terrestrial megaherbiv ...
... Fig. 1 maps the deficit in current megafaunal diversity compared with what would be expected if Late Pleistocene species had survived to the present (44). Loss has been most dramatic in the megaherbivores and megacarnivores. The Late Pleistocene harbored at least 50 species of terrestrial megaherbiv ...
Biology 300 GENERAL ECOLOGY Spring 1997
... Instructor: Dr. Douglas S. Glazier, Professor of Biology, Office: B229 Brumbaugh Science Center, Office hours: 11:00-12:00 TTH, 1:00-2:00 MThF usually (to arrange meetings at other times send an email message to [email protected] or call 641-3584). Course description: Examines the interactions of ...
... Instructor: Dr. Douglas S. Glazier, Professor of Biology, Office: B229 Brumbaugh Science Center, Office hours: 11:00-12:00 TTH, 1:00-2:00 MThF usually (to arrange meetings at other times send an email message to [email protected] or call 641-3584). Course description: Examines the interactions of ...
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.