• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
53 Notes
53 Notes

... • Some populations fluctuate greatly and make it difficult to define K • Some populations show an Allee effect, in which individuals have a more difficult time surviving or reproducing if the population size is too small ...
Growth Rate of Acropora formosa and Montipora
Growth Rate of Acropora formosa and Montipora

... coral rehabilitation method which can increase growth rate of coral. This study was to determine the growth rate of colonies of Acropora formosa and Montipora digitata growing on Biorock substrate and away (up to 10 meters) from Biorock substrate.This study was conducted in Gili Trawangan from April ...
the biology, ecology and conservation of euphorbia
the biology, ecology and conservation of euphorbia

... provided better predictions of population density) and a more comprehensive survey and data analysis in this study, and a failure to implement the conservation management plan proposed by Raal (1986). It is estimated that the total number of individuals in all the populations comprise approximately ...
Population dynamics of large herbivores: variable recruitment with
Population dynamics of large herbivores: variable recruitment with

... Fortunately, recent years have seen a rapid increase in use of CMR and radiotelemetry methods for estimating survival rates and their variability. The modeling of survival has now a firm statistical basis and allows for a flexible analysis of the roles of environmental factors and of density3. The t ...
generalist feeding behaviors of aedes sierrensis larvae and their
generalist feeding behaviors of aedes sierrensis larvae and their

... interactions among mosquito larvae, midsized organisms (such as protozoa), and lowerlevel organisms (such as bacteria and fungi) in west coast phytotelmata. Laboratory microcosm experiments were conducted to characterize the feeding strategies of Ae. sierrensis larvae in the presence of multiple res ...
Newell's shearwater population modeling for Habitat Conservation
Newell's shearwater population modeling for Habitat Conservation

... When  considered  independently,  fallout  and  powerline  minimization  have  the  potential  to  increase  growth  rate  by  up  to  0.5%  and  0.3%,  respectively,  but  would  prove  more  effective  in  areas  where  concurrent  colony  management  is  planned.    The  Save  Our  Shearwater  pr ...
Gradients in density variations of small rodents: the importance of
Gradients in density variations of small rodents: the importance of

... in northern Scandinavia usually extend over four years between a population low and a subsequent peak-decline. A shorter number of years will cause great random effects in indices of cyclicity for these northern areas (cf. Henttonen et al. 1985) while three years may be enough in southern Fennoscand ...
weakly density-dependent mortality and the coexistence of species
weakly density-dependent mortality and the coexistence of species

... differ only moderately in their density-independent mortality is generically possible. Since the attractor is not necessarily a steady state, one could argue that this may be just another example of the well-known coexistence on a limit cycle Armstrong and McGehee (1980). Note however, that coexiste ...
Introduction - A New Development @ Chavoux.com
Introduction - A New Development @ Chavoux.com

... capacity as “the concept of vegetation-ungulate equilibrium” resulting in a continuous line of possible values (for K) (Figure 2). Different people have called two points on this curve “carrying capacity”. The one is the point where the nutritional value available per individual animal has fallen to ...
Body-mass constraints on foraging behaviour determine population
Body-mass constraints on foraging behaviour determine population

... (Fig. 1). When consumers are small relative to their resources (small consumer–resource body-mass ratios) the reactive distance is high and the consumer movement is slow (Aljetlawi, Sparrevik & Leonardsson 2004). When consumers are large relative to their resources (high consumer–resource body-mass ...
The Stabilizing Effect of Intraspecific Genetic Variation on Population
The Stabilizing Effect of Intraspecific Genetic Variation on Population

... impact remain empirically unanswered: (a) How does intraspecific genetic diversity affect the ecological characteristics of sexual species, in which recombination can alter the outcome of causal mechanisms such as selection and niche diversification? (b) Does genetic diversity increase population dy ...
Sensitivity of copepod populations to bottom-up and top
Sensitivity of copepod populations to bottom-up and top

... distributions of these species differ as well (see Ji et al., 2009), including a steeper decrease in the abundance from shallow to deep regions for PS than CT. These differences in spatio-temporal patterns suggest that their distributions are likely related to their unique life-history traits, with ...
Coexistence of mixotrophs, autotrophs, and heterotrophs in
Coexistence of mixotrophs, autotrophs, and heterotrophs in

... of resources. The dashed arrows indicate the release of excess photosynthate that occurs when autotrophs are growing under P limitation. The return of C and P to the resource pools by the organisms occurs but is not shown. ...
14.1 Habitat And Niche
14.1 Habitat And Niche

... limiting factor is not affected by population size/density – These are usually ABIOTIC limiting factors such as Weather Forrest fires Natural disasters Human activities ...
Federal Concerns Regarding Hatchery Steelhead Spawning in the
Federal Concerns Regarding Hatchery Steelhead Spawning in the

... of their life in the ocean. • U.S. Fish & Wildlife Service - species that spend most of their life on land or in freshwater. ...
Extinction thresholds: insights from simple models
Extinction thresholds: insights from simple models

... always positive, as shown in Fig. 1. For this situation there is a single solution, n* = k, which is stable. On the other hand, Eq. 1 has two solutions, n* = k which is again stable, and n* = c, which is unstable (population either increases or decreases towards extinction, Fig. 1). A model like Eq. ...
Wildlife Populations in the Pacaya
Wildlife Populations in the Pacaya

... periods the fish enter the flooded forests and feed on the abundance of vegetative and  animal production, especially the abundance of fruits, invertebrates and other living  organisms trapped in the annual floods. Indeed, many tree species fruit during this season  and rely on the fish as their pri ...
A dual frame survey to assess time- and space
A dual frame survey to assess time- and space

... while it is restricted to a 3-4 months (summer) period in the northern part of the Alps. ...
Adaptation, density dependence and the responses of trophic level
Adaptation, density dependence and the responses of trophic level

... The responses of abundances to the extrinsic per capita mortality rates are obtained by differentiating the equilibrium conditions for equations (1a–d) with respect to each of the di. The resulting formulae can be simplified somewhat by assuming that the equilibrium of the system is locally stable. ...
Metapopulation Ecology - Department of Ecology and Evolutionary
Metapopulation Ecology - Department of Ecology and Evolutionary

... disturbances, such as drought or human persecution, or biological (often intrinsic) disturbances such as predation and parasitism. The basic result of this model is that, as for the logistic population models, if c > p, then an initially small metapopulation grows towards equilibrium. At equilibrium ...
A trade-off between growth and starvation endurance in a pit
A trade-off between growth and starvation endurance in a pit

... feeding and starvation phases using Pitman’s test for the equality of variances in paired samples (see Kelly and Price 2005). Significantly distinct variances point to the existence of a differential effect in addition to the expected regression to the mean effect. Alternatively, if only the regress ...
lions on small reserves - Carnivore Conservation
lions on small reserves - Carnivore Conservation

... Lions are regarded as high profile animals by the eco-tourism industry and are a sought-after species by local and international tourists alike. In an effort to be more competitive in the tourism market, landowners often agree to establish lions in their game reserves. However, the consequences of l ...
Cost-efficient fenced reserves for conservation: single
Cost-efficient fenced reserves for conservation: single

... The day-to-day reality of management planning is complex, and short funding cycles from uncertain sources mean that building a single large fence is not always feasible. Additional funding following the demonstrated success of an exclosure can be used to leverage further investment to extend the ori ...
Ontario Moose Resource Report for WMU 01A
Ontario Moose Resource Report for WMU 01A

... In Ontario, the moose population and its habitat is managed using an ecological approach. This approach takes into account a wide range of factors related to moose and uses the best available science and information on moose populations and harvest. Ontario’s Cervid Ecological Framework and Moose Ma ...
Cohort Dynamics Give Rise to Alternative Stable Community States.
Cohort Dynamics Give Rise to Alternative Stable Community States.

... variability is caused endogenously (Armstrong and McGehee 1980; Adler 1990). While implications of size structure for the occurrence of ASS have been previously acknowledged (Miller and Rudolf 2011 and references therein), endogenously generated variability, that is, population cycles, caused by siz ...
< 1 ... 4 5 6 7 8 9 10 11 12 ... 105 >

Maximum sustainable yield

In population ecology and economics, maximum sustainable yield or MSY is theoretically, the largest yield (or catch) that can be taken from a species' stock over an indefinite period. Fundamental to the notion of sustainable harvest, the concept of MSY aims to maintain the population size at the point of maximum growth rate by harvesting the individuals that would normally be added to the population, allowing the population to continue to be productive indefinitely. Under the assumption of logistic growth, resource limitation does not constrain individuals’ reproductive rates when populations are small, but because there are few individuals, the overall yield is small. At intermediate population densities, also represented by half the carrying capacity, individuals are able to breed to their maximum rate. At this point, called the maximum sustainable yield, there is a surplus of individuals that can be harvested because growth of the population is at its maximum point due to the large number of reproducing individuals. Above this point, density dependent factors increasingly limit breeding until the population reaches carrying capacity. At this point, there are no surplus individuals to be harvested and yield drops to zero. The maximum sustainable yield is usually higher than the optimum sustainable yield and maximum economic yield.MSY is extensively used for fisheries management. Unlike the logistic (Schaefer) model, MSY has been refined in most modern fisheries models and occurs at around 30% of the unexploited population size. This fraction differs among populations depending on the life history of the species and the age-specific selectivity of the fishing method.However, the approach has been widely criticized as ignoring several key factors involved in fisheries management and has led to the devastating collapse of many fisheries. As a simple calculation, it ignores the size and age of the animal being taken, its reproductive status, and it focuses solely on the species in question, ignoring the damage to the ecosystem caused by the designated level of exploitation and the issue of bycatch. Among conservation biologists it is widely regarded as dangerous and misused.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report