. Carp, Cyprinus carpio Overview Overview table Invasion history
... The life-history is flexible, with long breeding seasons (up to 9 months) and the ability to spawn multiple times each year. Spawning occurs two or three times over a 14 day interval. Mating groups of one female and several males swim actively before spawning. A temperature of 18°C is required for s ...
... The life-history is flexible, with long breeding seasons (up to 9 months) and the ability to spawn multiple times each year. Spawning occurs two or three times over a 14 day interval. Mating groups of one female and several males swim actively before spawning. A temperature of 18°C is required for s ...
great lakes ciscoes Great lakes Ciscoes
... and altered by invasive species. Although nutrient inputs were greatly curtailed following establishment of the Clean Water Act, populations of Great Lakes Ciscoes have only rebounded in Lake Superior and in a few locations in northern Lake Huron and Lake Michigan. Recovery of Great Lakes Ciscoes is ...
... and altered by invasive species. Although nutrient inputs were greatly curtailed following establishment of the Clean Water Act, populations of Great Lakes Ciscoes have only rebounded in Lake Superior and in a few locations in northern Lake Huron and Lake Michigan. Recovery of Great Lakes Ciscoes is ...
Does eutrophication-driven evolution change aquatic ecosystems?
... (Coregonus spp.) of central European subalpine lakes [36]. The breakdown of reproductive isolation and resulting gene flow led to losses of genetic, phenotypic and functional diversity in the species flock across the region. This case study is discussed in more detail in §3f. The effects of eutrophi ...
... (Coregonus spp.) of central European subalpine lakes [36]. The breakdown of reproductive isolation and resulting gene flow led to losses of genetic, phenotypic and functional diversity in the species flock across the region. This case study is discussed in more detail in §3f. The effects of eutrophi ...
Vulnerable Marine Ecosystems Dominated by Deep
... The large sessile sea anemones such as Actinauge verelli (Figure 1.3.3) are able to contract when contacted by fishing drags or dredges and appear to be undamaged (Freese et al., 1999), although other species do not recover ...
... The large sessile sea anemones such as Actinauge verelli (Figure 1.3.3) are able to contract when contacted by fishing drags or dredges and appear to be undamaged (Freese et al., 1999), although other species do not recover ...
RIVER CONSERVATION: CHALLENGES AND OPPORTUNITIES
... interest. Many biological traits of nonnative species, such as temperature tolerance or body size, can be important determinants of their invasion success in particular water bodies. However, the best predictors for invasions are usually simply those species that are of interest to humans, and eithe ...
... interest. Many biological traits of nonnative species, such as temperature tolerance or body size, can be important determinants of their invasion success in particular water bodies. However, the best predictors for invasions are usually simply those species that are of interest to humans, and eithe ...
1PBIOL - PP8 (Limiting Factors) - youngs-wiki
... factors cause populations to increase or decrease. For example, if there is an unlimited amount of food, water, and space, populations can grow very quickly. Without any limits, 10 breeding pairs of rabbits could expand to 10 million breeding pairs in only 3 years. In a healthy, properly functioning ...
... factors cause populations to increase or decrease. For example, if there is an unlimited amount of food, water, and space, populations can grow very quickly. Without any limits, 10 breeding pairs of rabbits could expand to 10 million breeding pairs in only 3 years. In a healthy, properly functioning ...
Lecture Outlines Natural Disasters, 5th edition
... Madagascar and New Zealand • When humans arrived, largest animals were flightless birds – elephant birds in Madagascar and moas in New Zealand • Humans killed birds and stole eggs until populations were low enough that random extinction finished them off • Rate of human-induced or –related extinctio ...
... Madagascar and New Zealand • When humans arrived, largest animals were flightless birds – elephant birds in Madagascar and moas in New Zealand • Humans killed birds and stole eggs until populations were low enough that random extinction finished them off • Rate of human-induced or –related extinctio ...
Why Healthy Oceans Need Sharks
... the balance of marine ecosystems. Apex predators directly limit the populations of their prey, which in turn affects the prey species of those animals, and so on.1 The diets of most top predators are quite varied. This allows top predators to switch prey species when certain populations are low, the ...
... the balance of marine ecosystems. Apex predators directly limit the populations of their prey, which in turn affects the prey species of those animals, and so on.1 The diets of most top predators are quite varied. This allows top predators to switch prey species when certain populations are low, the ...
pdf
... mer season off Santa Catarina (Pérez, 2002). It raises the question of whether this is due to oceanographic anomalies or whether it can be caused by the overexploitation of higher trophic level species. Also, skipjack tuna pole-and-line boats enter the coast for young sardines as bait, conflicting w ...
... mer season off Santa Catarina (Pérez, 2002). It raises the question of whether this is due to oceanographic anomalies or whether it can be caused by the overexploitation of higher trophic level species. Also, skipjack tuna pole-and-line boats enter the coast for young sardines as bait, conflicting w ...
Marine habitats: fauna and ecology
... which is luxuriant in a certain season and becomes quiescent in another, will form an ephemeral habitat to which the species living in that habitat must adapt; ● presence of ecosystem engineers. Ecosystem engineers have important functions, without having important structural roles. For example, sea ...
... which is luxuriant in a certain season and becomes quiescent in another, will form an ephemeral habitat to which the species living in that habitat must adapt; ● presence of ecosystem engineers. Ecosystem engineers have important functions, without having important structural roles. For example, sea ...
Reconciling Ecosystems: Reversing Declines in Native Species
... The number of imperiled species is increasing rapidly. Since the first statewide assessment in 1985, fish species have been listed under state and federal Endangered Species Acts (ESAs) at a rate of about one species per year, with 31 listed by 2010. Most native fishes are endemic only to California ...
... The number of imperiled species is increasing rapidly. Since the first statewide assessment in 1985, fish species have been listed under state and federal Endangered Species Acts (ESAs) at a rate of about one species per year, with 31 listed by 2010. Most native fishes are endemic only to California ...
Vanni et al 2009 - units.miamioh.edu
... mechanism of intraspecific competition. Many zooplankton taxa make autotoxins, which are chemicals that inhibit feeding or increase mortality in conspecifics. For example, individuals of the rotifer Synchaeta pectinata produce an autotoxin that reduces growth rate and increases mortality of other in ...
... mechanism of intraspecific competition. Many zooplankton taxa make autotoxins, which are chemicals that inhibit feeding or increase mortality in conspecifics. For example, individuals of the rotifer Synchaeta pectinata produce an autotoxin that reduces growth rate and increases mortality of other in ...
Species Introduction
... as valuable as native species commercially. So, more would have to be caught. Smelt are best caught using trawls and fishers on Lake Winnipeg are set up with gill nets. Further, Lake Winnipeg may not be suitable for trawling as it may be too shallow (Derksen, A., 1990). As smelt colonize in Lake Win ...
... as valuable as native species commercially. So, more would have to be caught. Smelt are best caught using trawls and fishers on Lake Winnipeg are set up with gill nets. Further, Lake Winnipeg may not be suitable for trawling as it may be too shallow (Derksen, A., 1990). As smelt colonize in Lake Win ...
Population Management Plan Submission
... management that is able to develop measures that respond to a range of threats to marine species including direct and indirect fishing and other human impacts. A PMP must also be able to respond to mortality resulting from all three types of fishing that occurring in New Zealand (customary, recreati ...
... management that is able to develop measures that respond to a range of threats to marine species including direct and indirect fishing and other human impacts. A PMP must also be able to respond to mortality resulting from all three types of fishing that occurring in New Zealand (customary, recreati ...
managing fisheries effects on marine food webs
... of fished species would be competing with the fishery only if they are feeding substantially from the fished population and the fished population is insufficient to meet the needs of predators and support the fishery at the same time. In this case, competition would be evident if the productivity of the p ...
... of fished species would be competing with the fishery only if they are feeding substantially from the fished population and the fished population is insufficient to meet the needs of predators and support the fishery at the same time. In this case, competition would be evident if the productivity of the p ...
Shifting dominance among Scarid species on reefs representing a
... that the removal of fish, even under low fishing pressure, was followed by a compensatory increase of the densities of smallsize individuals of the targeted species; this was a direct response of these fish populations to the chronic removal of large and medium-size individuals. Surprisingly, in the ...
... that the removal of fish, even under low fishing pressure, was followed by a compensatory increase of the densities of smallsize individuals of the targeted species; this was a direct response of these fish populations to the chronic removal of large and medium-size individuals. Surprisingly, in the ...
Genetic Variation
... • 245 million years ago marked the largest extinction of all time. • Douglas Erwin, a famous paleobiologist, marked it as the “Mother of Mass Extinctions”. • An estimated 57% of all families, and 97% of all marine animals became extinct. • This was a very rapid extinction, almost certainly taking pl ...
... • 245 million years ago marked the largest extinction of all time. • Douglas Erwin, a famous paleobiologist, marked it as the “Mother of Mass Extinctions”. • An estimated 57% of all families, and 97% of all marine animals became extinct. • This was a very rapid extinction, almost certainly taking pl ...
The Effect of Recycling on Plant Competitive Hierarchies
... 2 (Ingestad and Agren 1995; Reich et al. 1997). In appendix B in the online edition of the American Naturalist, we show that our result would hold if nonlinear uptake rates (e.g., Michaelis-Menten uptake kinetics) were used. Growth is limited through inter- and intraspecific competition for resource ...
... 2 (Ingestad and Agren 1995; Reich et al. 1997). In appendix B in the online edition of the American Naturalist, we show that our result would hold if nonlinear uptake rates (e.g., Michaelis-Menten uptake kinetics) were used. Growth is limited through inter- and intraspecific competition for resource ...
Eastern Freshwater Cod - NSW Department of Primary Industries
... The Eastern Freshwater Cod (Maccullochella ikei), often called Eastern Cod or Clarence River Cod, is similar in appearance to Murray Cod (Maccullochella peelii). It belongs to the family Percichthyidae and is native to the Clarence and Richmond River systems of north-eastern NSW. Another similar spe ...
... The Eastern Freshwater Cod (Maccullochella ikei), often called Eastern Cod or Clarence River Cod, is similar in appearance to Murray Cod (Maccullochella peelii). It belongs to the family Percichthyidae and is native to the Clarence and Richmond River systems of north-eastern NSW. Another similar spe ...
Chapter 3 - Santa Rosa Home
... Evolution in the Hawaiian Islands has generated hundreds of species, many unique to the islands The island chain was once home to 140 species of native birds In recent times, half of the native bird species have gone extinct Introduced species (like pigs, cattle, rats, and cats) destroyed ha ...
... Evolution in the Hawaiian Islands has generated hundreds of species, many unique to the islands The island chain was once home to 140 species of native birds In recent times, half of the native bird species have gone extinct Introduced species (like pigs, cattle, rats, and cats) destroyed ha ...
American Lands Alliance v. BLM
... Western Organization of Resource Councils Plaintiffs or aligned with planitiffs: Natural Resources Defense Council, EarthJustice, Wyoming Outdoor Council, Powder River Basin Resource Council, and several individuals. Aligned with defendants: Western Gas, Marathon, Pennaco, Williams, Lance, Bill Bar ...
... Western Organization of Resource Councils Plaintiffs or aligned with planitiffs: Natural Resources Defense Council, EarthJustice, Wyoming Outdoor Council, Powder River Basin Resource Council, and several individuals. Aligned with defendants: Western Gas, Marathon, Pennaco, Williams, Lance, Bill Bar ...
Stock Assessment For Napoleon Wrasse_final
... was 1.0 after the size of 55 cm). Due to the lack of fecundity data, recruitment parameter based on gonad weight for bumphead parrotfish was assumed to be the same as humphead wrasse. The model assumes the fish stock is one large population. ...
... was 1.0 after the size of 55 cm). Due to the lack of fecundity data, recruitment parameter based on gonad weight for bumphead parrotfish was assumed to be the same as humphead wrasse. The model assumes the fish stock is one large population. ...
an evaluation of intertidal feeding habitats from a shorebird
... ter consists of the prey with the appropriate size and within data in proper currencies and taxonomic groupings to reach of the bill, the harvestable fraction (bottom graph). appear in the list (Table 1). Our personal libraries yielded data for 16 sites and the references listed in the examined sour ...
... ter consists of the prey with the appropriate size and within data in proper currencies and taxonomic groupings to reach of the bill, the harvestable fraction (bottom graph). appear in the list (Table 1). Our personal libraries yielded data for 16 sites and the references listed in the examined sour ...
Tilburg University A paleoeconomic theory of co
... humans, the colonization of early humans, and why human overkill might have caused a mass megafauna extinction (e.g., mammoths) at the end of the Pleistocene (see Gamble 1998; Brook and Bowman 2002; Roberts et al. 2001; Alroy 2001; Choquenot and Bowman 1998, Beck 1996, Smith 1975). And while many hy ...
... humans, the colonization of early humans, and why human overkill might have caused a mass megafauna extinction (e.g., mammoths) at the end of the Pleistocene (see Gamble 1998; Brook and Bowman 2002; Roberts et al. 2001; Alroy 2001; Choquenot and Bowman 1998, Beck 1996, Smith 1975). And while many hy ...
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.