Fish assemblages on sunken vessels and natural reefs in southeast
... length were recorded to the nearest cm. A 7.5 m radius line was laid out prior to the count as an aid in estimating the cylinder boundary and the diver used a 1-m rod with a ruler attached at one end in a T-configuration to aid in length estimation. The bow, stern, port and starboard sides were cens ...
... length were recorded to the nearest cm. A 7.5 m radius line was laid out prior to the count as an aid in estimating the cylinder boundary and the diver used a 1-m rod with a ruler attached at one end in a T-configuration to aid in length estimation. The bow, stern, port and starboard sides were cens ...
Lake Burley Griffin Fisheries Survey 2012
... redfin. Most urban lakes in the ACT are also dominated by these two species of fish as is the Queanbeyan River upstream (ACT gov unpublished data and Jekabsons 2011). The native fish composition in LBG shows the expected diversity in the smaller species for a large water body, however, larger native ...
... redfin. Most urban lakes in the ACT are also dominated by these two species of fish as is the Queanbeyan River upstream (ACT gov unpublished data and Jekabsons 2011). The native fish composition in LBG shows the expected diversity in the smaller species for a large water body, however, larger native ...
Fishes of southern South America: a story driven by temperature
... related to previous warm water adaptation. A low equilibrium loss temperature can be seen as a product of the present thermal condition (Gómez 1990). Early studies on Arctic and Antarctic fishes found resting metabolic rates that were greater than those predicted by extrapolation of the resting met ...
... related to previous warm water adaptation. A low equilibrium loss temperature can be seen as a product of the present thermal condition (Gómez 1990). Early studies on Arctic and Antarctic fishes found resting metabolic rates that were greater than those predicted by extrapolation of the resting met ...
Time course of plant diversity effects on
... divided into four functional groups (grasses, small herbs, tall herbs and legumes) by multivariate cluster analysis and all possible combinations of plant species richness 3 functional group richness were realized from the 60-species pool. Within each plant species richness 3 functional group richne ...
... divided into four functional groups (grasses, small herbs, tall herbs and legumes) by multivariate cluster analysis and all possible combinations of plant species richness 3 functional group richness were realized from the 60-species pool. Within each plant species richness 3 functional group richne ...
Place-Based Ecosystem Management in the Open Ocean
... highly aggregated, serial depletion of fish populations ...
... highly aggregated, serial depletion of fish populations ...
Unit 2 * Ecosystems and Population Change
... • A niche refers to the role an organism has within an ecosystem, physically, chemically and biologically. ...
... • A niche refers to the role an organism has within an ecosystem, physically, chemically and biologically. ...
Unit 2 * Ecosystems and Population Change
... • A niche refers to the role an organism has within an ecosystem, physically, chemically and biologically. ...
... • A niche refers to the role an organism has within an ecosystem, physically, chemically and biologically. ...
CRS Report for Congress Endangered Species List Revisions:
... works. Different standards have been used to judge the ESA a failure and a success. Opponents of the Act contend that the ESA has failed while costing taxpayers billions of dollars, citing the low number of “recovered” species removed from the list. Proponents assert that the ESA has succeeded in pr ...
... works. Different standards have been used to judge the ESA a failure and a success. Opponents of the Act contend that the ESA has failed while costing taxpayers billions of dollars, citing the low number of “recovered” species removed from the list. Proponents assert that the ESA has succeeded in pr ...
Chapter 55 Practice Multiple Choice
... temperature fluctuations were directly correlated even in prehistoric times. c. Global warming could have significant effects on United States agriculture. d. Sea levels will likely rise, displacing as much as 50% of the world's human population. e. A, B, C, and D are all correct Use the incomplete ...
... temperature fluctuations were directly correlated even in prehistoric times. c. Global warming could have significant effects on United States agriculture. d. Sea levels will likely rise, displacing as much as 50% of the world's human population. e. A, B, C, and D are all correct Use the incomplete ...
- Wiley Online Library
... and temporal scales than customary, with the aim of recreating functioning ecosystems through a combination of large-scale ecological restoration and species introductions. The term ‘rewilding’ has come to apply to this large-scale ecosystem restoration program. While reintroductions of species with ...
... and temporal scales than customary, with the aim of recreating functioning ecosystems through a combination of large-scale ecological restoration and species introductions. The term ‘rewilding’ has come to apply to this large-scale ecosystem restoration program. While reintroductions of species with ...
Translocation strategies for multiple species depend on interspecific
... change of the populations’ realized carrying capacities. For example, flour beetles reached higher population sizes in experiments without the presence of a competing species (Park 1962). Further, interspecific interactions influence Allee effects, and theory predicts that a consumer’s Allee effect ...
... change of the populations’ realized carrying capacities. For example, flour beetles reached higher population sizes in experiments without the presence of a competing species (Park 1962). Further, interspecific interactions influence Allee effects, and theory predicts that a consumer’s Allee effect ...
Biodiversity Guided Notes - Bloomsburg Area School District
... _______________________rather than individual species. • By doing this, we may be able to save most of the species in an ecosystem instead of only the ones that have been identified as endangered. • The general public has now begun to understand that Earth’s biosphere depends on all its connected ec ...
... _______________________rather than individual species. • By doing this, we may be able to save most of the species in an ecosystem instead of only the ones that have been identified as endangered. • The general public has now begun to understand that Earth’s biosphere depends on all its connected ec ...
Peter J. Mumby, , 98 (2006); DOI: 10.1126/science.1121129
... reefs (2). Grazing performs several critical functions in this ecosystem, including the conversion of primary production to fish-based trophic pathways (3), the provision of suitable settlement substrata for new corals (4), and the mediation of competition between corals and macroalgae (5). Parrotfi ...
... reefs (2). Grazing performs several critical functions in this ecosystem, including the conversion of primary production to fish-based trophic pathways (3), the provision of suitable settlement substrata for new corals (4), and the mediation of competition between corals and macroalgae (5). Parrotfi ...
Chapter 55
... • So far, 11.5 percent of Earth’s terrestrial surface has been set aside as protected areas. • Researchers are using a geographic approach called the Gap Analysis Program (GAP) to assess the effectiveness of the current system of protected areas. ...
... • So far, 11.5 percent of Earth’s terrestrial surface has been set aside as protected areas. • Researchers are using a geographic approach called the Gap Analysis Program (GAP) to assess the effectiveness of the current system of protected areas. ...
"S C --
... with a diet of insufficient quality or quantity to support growth or even stabilization of populations. A similar issue has arisen in Hawaii with lobster fisheries and Endangered Hawaiian monk seals. While this issue has not reared its head in the northeast, there is some concern that as fisheries t ...
... with a diet of insufficient quality or quantity to support growth or even stabilization of populations. A similar issue has arisen in Hawaii with lobster fisheries and Endangered Hawaiian monk seals. While this issue has not reared its head in the northeast, there is some concern that as fisheries t ...
Research paper: Food webs in the ocean: Who eats whom and how
... captive individuals and from bio-energetic modelling. Consumption of marine organisms, expressed as a percentage of an individual’s body weight per day, ranges from about 4–15% for zooplankton, to 1–4% for cephalopods, 1–2% for fish, 3–5% for marine mammals and 15–20% for sea birds. Immature age cla ...
... captive individuals and from bio-energetic modelling. Consumption of marine organisms, expressed as a percentage of an individual’s body weight per day, ranges from about 4–15% for zooplankton, to 1–4% for cephalopods, 1–2% for fish, 3–5% for marine mammals and 15–20% for sea birds. Immature age cla ...
invasive species - the National Sea Grant Library
... ecosystems in more insidious ways. For example, they may change the cycling of nutrients in a way that encourages invasions by other plants, or they may promote invasions by non-native animals. In some cases, alien plants and animals combine to create a positive feedback loop with the plant providin ...
... ecosystems in more insidious ways. For example, they may change the cycling of nutrients in a way that encourages invasions by other plants, or they may promote invasions by non-native animals. In some cases, alien plants and animals combine to create a positive feedback loop with the plant providin ...
Discovery of the invasive Mayan Cichlid fish “Cichlasoma
... introduced into Florida (USA). Based on what is known about Florida “C.” urophthalmus, it is predicted that this cichlid will further invade coastal and inland waters in Thailand and elsewhere in Southeast Asia. This cichlid has a long history in the aquarium trade in Europe. However, there are no r ...
... introduced into Florida (USA). Based on what is known about Florida “C.” urophthalmus, it is predicted that this cichlid will further invade coastal and inland waters in Thailand and elsewhere in Southeast Asia. This cichlid has a long history in the aquarium trade in Europe. However, there are no r ...
CHAPTER 5. THREATS AND EMERGING CONCERNS 5.1
... Natural communities are subject to numerous natural processes that can trigger, reinforce or constrain the components of an ecosystem. Today, many of the stressors that cause impacts to wildlife and their habitats can be tied to anthropogenic activities. Burning fossil fuels, overharvesting, ecosyst ...
... Natural communities are subject to numerous natural processes that can trigger, reinforce or constrain the components of an ecosystem. Today, many of the stressors that cause impacts to wildlife and their habitats can be tied to anthropogenic activities. Burning fossil fuels, overharvesting, ecosyst ...
A Review of the Impacts, Effects of Common Carp on Freshwater
... (Baldry, 2000 p. 2). Ultimately, fish and wildlife are adversely affected by the loss of zooplankton and macroinvertebrate food sources, and loss of aquatic macrophytes that provide cover for larval and juvenile fish and substrate for eggs and invertebrates (Kahl 1991)” (Baldry, 2000 p. 2). Carp “Th ...
... (Baldry, 2000 p. 2). Ultimately, fish and wildlife are adversely affected by the loss of zooplankton and macroinvertebrate food sources, and loss of aquatic macrophytes that provide cover for larval and juvenile fish and substrate for eggs and invertebrates (Kahl 1991)” (Baldry, 2000 p. 2). Carp “Th ...
Effects of species diversity on the primary productivity of ecosystems
... ecological research (Loreau et al. 2001, Naeem 2002). Most of our understanding of how species diversity influences productivity has come from experiments performed with assemblages of terrestrial plants (reviewed by Johnson et al. 1996, Waide et al. 1999, Schwartz et al. 2000, Schmid et al. 2001). ...
... ecological research (Loreau et al. 2001, Naeem 2002). Most of our understanding of how species diversity influences productivity has come from experiments performed with assemblages of terrestrial plants (reviewed by Johnson et al. 1996, Waide et al. 1999, Schwartz et al. 2000, Schmid et al. 2001). ...
Biodiversity in grasslands: current changes and scenarios for the
... and Lauenroth, 2001). In summary, a spatially-explicit view of community and ecosystems allows new perspectives for processes (i.e. dispersal, population dynamics, and plantplant and plant animal interactions) and functions (i.e. soil organic matter dynamics, and water and nutrient circulation). W ...
... and Lauenroth, 2001). In summary, a spatially-explicit view of community and ecosystems allows new perspectives for processes (i.e. dispersal, population dynamics, and plantplant and plant animal interactions) and functions (i.e. soil organic matter dynamics, and water and nutrient circulation). W ...
Food selection and habitat preferences in deep-sea fishes
... The Red Sea is a long, narrow basin approximately 2000 km in length and averaging 280 km in width. The average depth is 491 m, but the deep axial troughs reach 3000 m. The shallow (100 m) Bab el Mandeb Straits in the south are 26 km wide, sharply limiting the exchange of water with the Indian Ocean. ...
... The Red Sea is a long, narrow basin approximately 2000 km in length and averaging 280 km in width. The average depth is 491 m, but the deep axial troughs reach 3000 m. The shallow (100 m) Bab el Mandeb Straits in the south are 26 km wide, sharply limiting the exchange of water with the Indian Ocean. ...
... behavior, that may alter the structure and function of the ecosystems invaded. This has turned the red swamp crayfish into a key ecological species of these ecosystems, modifying the routes of energy transfer and the availability of food resources and refuge for other species [7]. We expected that t ...
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.