Bacterial colonization and extinction on marine aggregates
... 2003, Froelich et al. 2013). Each combination of aggregate radius and target species density in the water was simulated from these initial conditions 960 or 1056 times (due to differences in architecture of computers used for simulation). Accurate simulation of small populations, such as the target ...
... 2003, Froelich et al. 2013). Each combination of aggregate radius and target species density in the water was simulated from these initial conditions 960 or 1056 times (due to differences in architecture of computers used for simulation). Accurate simulation of small populations, such as the target ...
A Science-Based Framework for Assessing the
... on productivity via changes in habitat or fish populations. The productivity-response curves provide linkages from the PoE to productivity. When the assessment phases outlined in DFO (2013a) (hereafter the “Productivity SAR”) indicate that there is a likelihood that a project will affect the product ...
... on productivity via changes in habitat or fish populations. The productivity-response curves provide linkages from the PoE to productivity. When the assessment phases outlined in DFO (2013a) (hereafter the “Productivity SAR”) indicate that there is a likelihood that a project will affect the product ...
On the ecology of a tropical fish community - Wageningen UR E
... © 1996M.C.Escher/ CordonArt-Baarn -Holland. Allerechten voorbehouden. ...
... © 1996M.C.Escher/ CordonArt-Baarn -Holland. Allerechten voorbehouden. ...
Michigan Department of Natural Resources 2009-85 Status of the Fishery Resource Report
... The positioning of Seven Mile Pond is unique in that it has three rivers that flow into it (Figure 1). The Thunder Bay River enters the northern arm of the impoundment from the west. This same northern arm also receives the North Branch Thunder Bay River. Both of these rivers are cool to warm-water ...
... The positioning of Seven Mile Pond is unique in that it has three rivers that flow into it (Figure 1). The Thunder Bay River enters the northern arm of the impoundment from the west. This same northern arm also receives the North Branch Thunder Bay River. Both of these rivers are cool to warm-water ...
Pages 304-308 - KSU Web Home
... The current mass extinction (6th) is human caused • During this Quaternary period, we may lose more than half of all species - Hundreds of human-induced species extinctions, and multitudes of others on the brink of extinction ...
... The current mass extinction (6th) is human caused • During this Quaternary period, we may lose more than half of all species - Hundreds of human-induced species extinctions, and multitudes of others on the brink of extinction ...
Effects of Aquaculture on World Fish Supplies
... pressure on ocean fish stocks, most of which are now fished at or beyond capacity, and to allow wild populations to recover. Production of farmed fish and shellfish does increase world fish supplies. Yet by using increasing amounts of wildcaught fish to feed farmed shrimp and salmon, and even to for ...
... pressure on ocean fish stocks, most of which are now fished at or beyond capacity, and to allow wild populations to recover. Production of farmed fish and shellfish does increase world fish supplies. Yet by using increasing amounts of wildcaught fish to feed farmed shrimp and salmon, and even to for ...
The Caiman Trade - AP Environmental Science
... whales (for meat)—to just about evteam found that, much to our surery endangered or threatened speprise, some previously known popucies. Almost the entire conservation lations of caimans were entirely effort for crocodilians is directed togone. Of the remainder, the bulk of ward using them for luxur ...
... whales (for meat)—to just about evteam found that, much to our surery endangered or threatened speprise, some previously known popucies. Almost the entire conservation lations of caimans were entirely effort for crocodilians is directed togone. Of the remainder, the bulk of ward using them for luxur ...
Invertebrate Occurence in Relation to Water Permanence and Fish
... of fishes are larger relative their invertebrate prey, making few invertebrates large or fast enough to avoid predation by fish and (2) size selectivity of fish on the potential prey available to consume, with larger species probably favouring maximum energy intake (Wellborn et. al 1996). However, i ...
... of fishes are larger relative their invertebrate prey, making few invertebrates large or fast enough to avoid predation by fish and (2) size selectivity of fish on the potential prey available to consume, with larger species probably favouring maximum energy intake (Wellborn et. al 1996). However, i ...
The growth–mortality tradeoff: evidence from anuran
... (Suding et al. 2003). In order for a tradeoV in the ability to grow at diVerent resource levels to be responsible for patterns of species replacement across resource gradients, growth must be proportional to traits that aVect demographic processes such as survivorship or fecundity. If this is the ca ...
... (Suding et al. 2003). In order for a tradeoV in the ability to grow at diVerent resource levels to be responsible for patterns of species replacement across resource gradients, growth must be proportional to traits that aVect demographic processes such as survivorship or fecundity. If this is the ca ...
BAILS et al 2005 Prescription for Great Lakes Ecosystem Protection and Restoration
... stress and promote the lakes’ recovery.1 From this perspective, protecting the Great Lakes is not particularly urgent and action can wait until we conduct more studies, while taking small corrective measures when the opportunity or need arises. However, if not addressed with great urgency, the Great ...
... stress and promote the lakes’ recovery.1 From this perspective, protecting the Great Lakes is not particularly urgent and action can wait until we conduct more studies, while taking small corrective measures when the opportunity or need arises. However, if not addressed with great urgency, the Great ...
Intra- and interspecific competition among coexisting lotic snails
... Gurevitch et al. 1992, Begon et al. 1996). In contrast, there have been relatively few studies of competition in stream ecosystems, and as in other systems, its prevalence and importance in structuring communities are debated (e.g., Hart 1983, Peckarsky 1983, Power et al. 1988, Grossman et al. 1998 ...
... Gurevitch et al. 1992, Begon et al. 1996). In contrast, there have been relatively few studies of competition in stream ecosystems, and as in other systems, its prevalence and importance in structuring communities are debated (e.g., Hart 1983, Peckarsky 1983, Power et al. 1988, Grossman et al. 1998 ...
Freshwater spiny crayfish in North East NSW
... Euastacus crayfish are vulnerable to environmental pressures as they are generally slow growing, late maturing, long lived and/or rare. Potential illegal harvest activities and/or misidentification with the common yabby (the common yabby has a greater bag limit than freshwater spiny crayfish and doe ...
... Euastacus crayfish are vulnerable to environmental pressures as they are generally slow growing, late maturing, long lived and/or rare. Potential illegal harvest activities and/or misidentification with the common yabby (the common yabby has a greater bag limit than freshwater spiny crayfish and doe ...
Identification of Species and Habitats that Support Commercial
... fisheries, we describe common characteristics of species fulfilling each role and provide a few examples of such species. We also discuss vulnerability to perturbation and the most common types of human-induced perturbations that will affect support species. For each function, we provide guidance on ...
... fisheries, we describe common characteristics of species fulfilling each role and provide a few examples of such species. We also discuss vulnerability to perturbation and the most common types of human-induced perturbations that will affect support species. For each function, we provide guidance on ...
Sample pages 2 PDF
... are instead considered as stress. Although Grime’s definition is very effective when applied to modular organisms such as plants and corals which accumulate biomass, it proves less compelling when dealing with other kinds of nonmodular organisms. Grime’s definition offers a clear distinction between d ...
... are instead considered as stress. Although Grime’s definition is very effective when applied to modular organisms such as plants and corals which accumulate biomass, it proves less compelling when dealing with other kinds of nonmodular organisms. Grime’s definition offers a clear distinction between d ...
The food limitation hypothesis for juvenile marine fish
... in their nursery grounds. We demonstrate that the relative lack of growth limitation observed for young marine fishes at the individual scale is related to an observational bias: fish have been affected by size-selective mortality linked to food limitation, but only surviving individuals are observe ...
... in their nursery grounds. We demonstrate that the relative lack of growth limitation observed for young marine fishes at the individual scale is related to an observational bias: fish have been affected by size-selective mortality linked to food limitation, but only surviving individuals are observe ...
seagrasses
... of seagrasses. They are mainly found in bays, estuaries, and coastal waters from the mid-intertidal (shallow) region down to depths of or meters. Seagrass distributions are extremely sensitive to variation in light and cannot live at depths lower than where photosynthetic benefits outweigh re ...
... of seagrasses. They are mainly found in bays, estuaries, and coastal waters from the mid-intertidal (shallow) region down to depths of or meters. Seagrass distributions are extremely sensitive to variation in light and cannot live at depths lower than where photosynthetic benefits outweigh re ...
Paiute Plan - Living Assessment
... Short term: PCT populations have remained fairly stable since 1998. They currently inhabit more miles of stream than they did historically, but the populations are heavily fragmented and cannot interbreed. Non-native trout exist below Llewellyn falls and 56 years of restoration and conservation effo ...
... Short term: PCT populations have remained fairly stable since 1998. They currently inhabit more miles of stream than they did historically, but the populations are heavily fragmented and cannot interbreed. Non-native trout exist below Llewellyn falls and 56 years of restoration and conservation effo ...
PDF
... Many of the concepts in policy and management measures discussed below are complex, and there are major differences between small-scale and large-scale fisheries that affect many of the considerations below. FAO has developed guidelines on practice and implementation for the precautionary approach, ...
... Many of the concepts in policy and management measures discussed below are complex, and there are major differences between small-scale and large-scale fisheries that affect many of the considerations below. FAO has developed guidelines on practice and implementation for the precautionary approach, ...
Linking Top-down Forces to the Pleistocene Megafaunal Extinctions
... narrow rings reflect food stress. His data Wyoming; Colby, Wyoming; Chittenango, New York; and Dent, Colorado. Each include tusk thickness growth rates at point on the graph represents the mean increment thickness for one mammoth nine sites for males and seven additional except for the point at 26 t ...
... narrow rings reflect food stress. His data Wyoming; Colby, Wyoming; Chittenango, New York; and Dent, Colorado. Each include tusk thickness growth rates at point on the graph represents the mean increment thickness for one mammoth nine sites for males and seven additional except for the point at 26 t ...
Linking Top-down Forces to the Pleistocene
... narrow rings reflect food stress. His data Wyoming; Colby, Wyoming; Chittenango, New York; and Dent, Colorado. Each include tusk thickness growth rates at point on the graph represents the mean increment thickness for one mammoth nine sites for males and seven additional except for the point at 26 t ...
... narrow rings reflect food stress. His data Wyoming; Colby, Wyoming; Chittenango, New York; and Dent, Colorado. Each include tusk thickness growth rates at point on the graph represents the mean increment thickness for one mammoth nine sites for males and seven additional except for the point at 26 t ...
07
... a. A field report will be submitted within five (5) weeks of project completion. b. Results of the project, as published or unpublished reports, also will be submitted. Reports will be submitted by Reserve and should cover all the activities requested under this permit. These individual reports shal ...
... a. A field report will be submitted within five (5) weeks of project completion. b. Results of the project, as published or unpublished reports, also will be submitted. Reports will be submitted by Reserve and should cover all the activities requested under this permit. These individual reports shal ...
grazer diversity, functional redundancy, and productivity in seagrass
... the variable. At a mechanistic level, however, the characteristics of individual species are fundamental to explaining the existence and form of such relationships (Aarssen 1997, Hooper and Vitousek 1997, Huston 1997, Tilman et al. 1997a, Wardle et al. 1997). Specifically, the relationship will depe ...
... the variable. At a mechanistic level, however, the characteristics of individual species are fundamental to explaining the existence and form of such relationships (Aarssen 1997, Hooper and Vitousek 1997, Huston 1997, Tilman et al. 1997a, Wardle et al. 1997). Specifically, the relationship will depe ...
1 CALIFORNIA SPECIAL CONCERN
... fish such as Delta smelt and their larvae. Low outflows place the mixing zone in the deep, narrow channels of the Delta and Sacramento River where productivity is lower because much of the water is beyond the reach of sunlight so fewer fish can be supported. A strong relationship between the abundan ...
... fish such as Delta smelt and their larvae. Low outflows place the mixing zone in the deep, narrow channels of the Delta and Sacramento River where productivity is lower because much of the water is beyond the reach of sunlight so fewer fish can be supported. A strong relationship between the abundan ...
Theme 1. Protection of Natural Resources
... increasing resource consumption rates. The global decline of biodiversity is now recognized as one of the most serious environmental issues facing humanity. Recognition of the worldwide impact of the decline of biodiversity inspired the global community to negotiate the United Nations Convention on ...
... increasing resource consumption rates. The global decline of biodiversity is now recognized as one of the most serious environmental issues facing humanity. Recognition of the worldwide impact of the decline of biodiversity inspired the global community to negotiate the United Nations Convention on ...
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.