Recent advances in ecological stoichiometry: insights for population
... of Daphnia , the density of juveniles competing for algal food will be low, and consequently juvenile survival and growth might increase because of higher food availability per individual. Third, such density-dependent responses in demographic rates can be further complicated by feedback links from ...
... of Daphnia , the density of juveniles competing for algal food will be low, and consequently juvenile survival and growth might increase because of higher food availability per individual. Third, such density-dependent responses in demographic rates can be further complicated by feedback links from ...
Recent advances in ecological stoichiometry: insights for population
... of Daphnia , the density of juveniles competing for algal food will be low, and consequently juvenile survival and growth might increase because of higher food availability per individual. Third, such density-dependent responses in demographic rates can be further complicated by feedback links from ...
... of Daphnia , the density of juveniles competing for algal food will be low, and consequently juvenile survival and growth might increase because of higher food availability per individual. Third, such density-dependent responses in demographic rates can be further complicated by feedback links from ...
Recreational angling markets to advance the conservation of a
... fish. They are frequently top predators in many of these rivers, although it is believed that they may be preyed on opportunistically by crocodile species where present. Mahseer have substantial importance culturally, as a source of food and as a target for recreational angling. Dependence on a netw ...
... fish. They are frequently top predators in many of these rivers, although it is believed that they may be preyed on opportunistically by crocodile species where present. Mahseer have substantial importance culturally, as a source of food and as a target for recreational angling. Dependence on a netw ...
Changes in community structure in temperate marine reserves
... a total of 80 transects covering 4 ha of sea floor. The rock: >50% of surfaces devoid of any algae. Data choice of this transect size was made based on the were analysed as the proportions of each habitat over study by MacDiarmid (1991). He compared the precithe entire transect. Temporal change in t ...
... a total of 80 transects covering 4 ha of sea floor. The rock: >50% of surfaces devoid of any algae. Data choice of this transect size was made based on the were analysed as the proportions of each habitat over study by MacDiarmid (1991). He compared the precithe entire transect. Temporal change in t ...
Chapter 6
... other salmonid species, eggs are deposited in gravel redds. Egg incubation requires water temperatures between 43°–56° F and dissolved oxygen concentration of at least 5 mg/L or high mortality can occur. Eggs generally hatch in 4–6 weeks, and fry begin feeding 2 weeks later. Some juveniles migrate d ...
... other salmonid species, eggs are deposited in gravel redds. Egg incubation requires water temperatures between 43°–56° F and dissolved oxygen concentration of at least 5 mg/L or high mortality can occur. Eggs generally hatch in 4–6 weeks, and fry begin feeding 2 weeks later. Some juveniles migrate d ...
Life strategies of fishes in European estuaries: the functional guild
... Estuarine use functional group. Estuaries may be used by fish species as nurseries, feeding grounds, spawning grounds, or pathways of migration (Elliott & Hemingway 2002). Functional groups accounting for these different uses have been developed by several authors worldwide producing different categ ...
... Estuarine use functional group. Estuaries may be used by fish species as nurseries, feeding grounds, spawning grounds, or pathways of migration (Elliott & Hemingway 2002). Functional groups accounting for these different uses have been developed by several authors worldwide producing different categ ...
Spatiotemporal food web dynamics along a desert riparian–upland
... nutrients, and prey, largely ignoring the movement of predators between habitats that differ in productivity (and how predators integrate pulses in resource availability over time). We set out to study seasonal variation in food web interactions between mammalian carnivores and their rodent prey alo ...
... nutrients, and prey, largely ignoring the movement of predators between habitats that differ in productivity (and how predators integrate pulses in resource availability over time). We set out to study seasonal variation in food web interactions between mammalian carnivores and their rodent prey alo ...
The iconic keystone predator has a pathogen
... sponges, barnacles, and seaweeds. Because Pisaster does not consume anemones, sponges, or seaweeds, these and other organisms benefit indirectly from the mussel-free space created by Pisaster. Furthermore, anemones receive indirect feeding benefits (dislodged food items) when Pisaster is present (D ...
... sponges, barnacles, and seaweeds. Because Pisaster does not consume anemones, sponges, or seaweeds, these and other organisms benefit indirectly from the mussel-free space created by Pisaster. Furthermore, anemones receive indirect feeding benefits (dislodged food items) when Pisaster is present (D ...
Environmental Assessment Tool for Private Aquaculture in the
... plan may be at risk from interspecific hybridization, predation or competition for food or habitat. More information is needed about the recovery species before a decision can be reached. Contact local lead person at www.cciw.ca/glimr/raps/aoc-map.html. If willing to accept risk, go to Question 32. ...
... plan may be at risk from interspecific hybridization, predation or competition for food or habitat. More information is needed about the recovery species before a decision can be reached. Contact local lead person at www.cciw.ca/glimr/raps/aoc-map.html. If willing to accept risk, go to Question 32. ...
Developing Conservation through Incremental Learning in the
... conservation practice used by Heiltsuk hunters, namely to rotate areas where one hunted. “For example,” she said, “If lots of deer were caught at a specific area, that area was left alone for a couple of years and other areas were used.” Such rotation of harvesting areas indicates that hunters have ...
... conservation practice used by Heiltsuk hunters, namely to rotate areas where one hunted. “For example,” she said, “If lots of deer were caught at a specific area, that area was left alone for a couple of years and other areas were used.” Such rotation of harvesting areas indicates that hunters have ...
Fish Survey and Aquatic Assessment Report for Horsehead Lake
... provide lake association members and residents with data that can be used to help identify fish management goals. ...
... provide lake association members and residents with data that can be used to help identify fish management goals. ...
CHANGES IN BENTHIC COMMUNITY COMPOSITION ... DZADEMA W. 271
... of the urchin do exist in the Discovery Bay area, principally in near crest and backreef areas, no recolonization of our study sites had occurred as of August, 1984. After 12 yr urchin numbers are still very low (M. E. Hay, pers. comm.), in an area in which Diudema was removed at St. Croix in 1972 ( ...
... of the urchin do exist in the Discovery Bay area, principally in near crest and backreef areas, no recolonization of our study sites had occurred as of August, 1984. After 12 yr urchin numbers are still very low (M. E. Hay, pers. comm.), in an area in which Diudema was removed at St. Croix in 1972 ( ...
recovery plan - Rogue Riverkeeper
... The Plan guides recovery action implementation through 5-year intervals over the next 25 years. While the Plan urges immediate implementation of many recovery actions, defining a timeframe for Plan implementation is necessary to structure action implementation needs and overall recovery action cost. ...
... The Plan guides recovery action implementation through 5-year intervals over the next 25 years. While the Plan urges immediate implementation of many recovery actions, defining a timeframe for Plan implementation is necessary to structure action implementation needs and overall recovery action cost. ...
Ethical issues in fisheries
... food, employment, and economic and social benefits, as well as a foundation for great cultures. That there are limits to the extraction of fishery resources has long been recognized by science, but policies and management have failed to consider them adequately, leading to regrettable environmental ...
... food, employment, and economic and social benefits, as well as a foundation for great cultures. That there are limits to the extraction of fishery resources has long been recognized by science, but policies and management have failed to consider them adequately, leading to regrettable environmental ...
Diel and longitudinal differences in habitat use by Noturusspecies
... negative aspects (Onorato et al., 1998). Compared to seines, electroshockers require less manpower, are not as affected by stream habitat (e.g., irregular substrate types and swift flow conditions), and are less selective when sampling; however, seines are not restricted by water quality (e.g., turb ...
... negative aspects (Onorato et al., 1998). Compared to seines, electroshockers require less manpower, are not as affected by stream habitat (e.g., irregular substrate types and swift flow conditions), and are less selective when sampling; however, seines are not restricted by water quality (e.g., turb ...
Spatial Extent and Dynamics of Dam Impacts on Tropical Island
... and ecology are poorly known, and their potential impact on tropical islands is especially high. As the optimal locations for high dams in the tropics were exhausted over time, a shift to smaller-scale projects ensued (Vaux and Goldman 1990). Therefore, in addition to high dams and reservoirs, low-h ...
... and ecology are poorly known, and their potential impact on tropical islands is especially high. As the optimal locations for high dams in the tropics were exhausted over time, a shift to smaller-scale projects ensued (Vaux and Goldman 1990). Therefore, in addition to high dams and reservoirs, low-h ...
Hierarchizing biological, physical and anthropogenic factors
... 2009; Halpern et al. 2010). One objective of unfished zones in MPAs is to help maintain viable fisheries in adjacent areas by increasing the density and size of fish, providing centres for dispersal of individuals and larvae, and augmenting local fishery yields through biomass exportation from the p ...
... 2009; Halpern et al. 2010). One objective of unfished zones in MPAs is to help maintain viable fisheries in adjacent areas by increasing the density and size of fish, providing centres for dispersal of individuals and larvae, and augmenting local fishery yields through biomass exportation from the p ...
Biojeopardy: Ecology
... the deer population decreases over a given time. What is that resources may be depleted or community may have changed due to arrival of a new predator Continue ...
... the deer population decreases over a given time. What is that resources may be depleted or community may have changed due to arrival of a new predator Continue ...
Biological Resources
... knowledgeable individuals, and is entered into the inventory as expeditiously as possible. The occurrence of a species of concern in a particular region is an indication that an additional population may occur at another location if habitat conditions are suitable. However, the absence of an occurre ...
... knowledgeable individuals, and is entered into the inventory as expeditiously as possible. The occurrence of a species of concern in a particular region is an indication that an additional population may occur at another location if habitat conditions are suitable. However, the absence of an occurre ...
Indirect Effects in - Department of Knowledge Technologies
... chain consisting of three or more components connected by grazing or predation. Daskalov was recently investigated a decrease in the top predator’s population in the Black Sea due to overfishing resulted in a ‘trophic casade’, leading to an increase in the abundance of planktivorous fish, a decline ...
... chain consisting of three or more components connected by grazing or predation. Daskalov was recently investigated a decrease in the top predator’s population in the Black Sea due to overfishing resulted in a ‘trophic casade’, leading to an increase in the abundance of planktivorous fish, a decline ...
Review Paper Biodiversity Effects on Aquatic Ecosystem Functioning
... processes, acknowledging the complexity of ecosystem functioning (Fig. 1b, point 2). In addition to the one-trophic level approach of many early studies, aquatic ecologists proposed the importance of looking at multitrophic assemblages (DUFFY, 2002; GILLER et al., 2004) and analyzed diversity effect ...
... processes, acknowledging the complexity of ecosystem functioning (Fig. 1b, point 2). In addition to the one-trophic level approach of many early studies, aquatic ecologists proposed the importance of looking at multitrophic assemblages (DUFFY, 2002; GILLER et al., 2004) and analyzed diversity effect ...
Document
... Wombats are small mammals that lives in Southeastern Australia, Tasmania, and a small area in Epping Forest National Park. There are only three species left, the three species are the common wombat, northern hairy nosed wombat, and the southern hairy nosed wombat. The northern hairy wombat is the mo ...
... Wombats are small mammals that lives in Southeastern Australia, Tasmania, and a small area in Epping Forest National Park. There are only three species left, the three species are the common wombat, northern hairy nosed wombat, and the southern hairy nosed wombat. The northern hairy wombat is the mo ...
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.