Seasonal growth cycles can be influenced by several factors, including temperature, amount of water and amount of daylight. Seasonal variation definition and synonyms of seasonal. The numerous sudden changes that evoke rapid and shortterm responses. For example, a swimwear company likely has better sales in the summer, and toy companies likely perform better in the period preceding christmas. Seasonal variation an overview sciencedirect topics. Seasonal variation is thus one class of temporal variation that can maintain genetic. Thinking about annual operating days, the number of monthly holidays are different from month to month. Variation, in biology, any difference between cells, individual organisms, or groups. For the definition and diagnosis of the metabolic syndrome in japan. The seasonal variation of weight gain can be explained in some populations by seasonal differences in resource availability, nutritional variation and rates of disease, but for other, more wellnourished populations this explanation is not sufficient and there may exist an endogenous seasonal rhythm of weight gain in children. Seasonal variation demand forecast mrp glossary of. Annual variation definition is the yearly change in a stars mean right ascension or declination produced by precession of the equinoxes and proper motion of the star. Variation definition and examples biology online dictionary. Phenotypic variations also include stages in an organisms life cycle and seasonal variations in an individual.
However, the spatiotemporal variation of the seasonal dynamic of gpp and its effects on spatial and temporal variations of agpp are still poorly addressed. Attribute parameter characterized the seasonal variation. A source period, during fall and winter, is attributed biota respiration exceeding photosynthesis. While in circulation, the red cells remain uniformly suspended in the plasma. In this article we will discuss about the meaning and physiological variation of erythrocyte sedimentation rate esr. Seasonal variation definition and meaning collins english dictionary. An index value is attached to each period of the time series within a year. It may be a modification in structure, form or function in an organism, deviating from other organisms of the same. Variation definition is the act or process of varying. Seasonal variation is measured in terms of an index, called a seasonal index. The influenza season is winter, especially in january and february, which matches the time when the sales of medicines increases, meaning it usually surges in. Variation meaning in the cambridge english dictionary. The variation of any parameter of the upper atmosphere with season. Seasonal variation in mortality with an increased winter incidence of and mortality rates from pneumonia is wellestablished and reconfirmed in this data set.
Seasonal variations financial definition of seasonal. Seasonality can be defined as the regu lar and periodic. It is used in separating the cyclical and irregular forces by subtracting the seasonal. Seasonal variation, trend, shortterm and random variation.
Sales forecasts and reports often adjust to account for seasonal variation, and the. Seasonal variation in the thermal biology of the rock hyrax procavia capensis by kelly joanne brown submitted in fulfillment ofthe academic requirements for the degree of master ofscience in the school ofbotany and zoology university ofkwazulunatal pietermaritzburg 2003. Seasonality definition, the state or quality of being seasonal or dependent on the seasons. Several potential mechanisms for annual variation in immune competence have been suggested.
As an example, small seasonal variation in certain parameters, such as. Seasonal variation it is a variable element in the timeseries analysis of forecasting, and refers to the phenomenon where the production and plan of product change on a certain seasonal trend depending to the characteristics of the product. Seasonal variation financial definition of seasonal variation. Seasonal variation in timing of pregnancy initiation attempts results from cultural and behavioural factors, whereas seasonal variation in fecundability stems from seasonal factors affecting the underlying biological mechanisms of fecundity. The seasonal dynamic of gross primary productivity gpp has influences on the annual gpp agpp of the terrestrial ecosystem. Some of the most marked temporal fluctuations in species abundances are linked to seasons. Additive model assumed for seasonal effects seasonal variation seasonally adjusted component of a time series seasonally adjusted time series. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Seasonal change in host immune competence, and hence susceptibility to infection or to symptomatic disease following an infection, has been proposed as a cause of seasonal variation in the incidence of some infectious diseases of humans dowell 2001.
The variation about the expected values for total proportion infected and other parameters of interest must also be considered. Sometimes the term is used in a wider sense relating to oscillations generated by periodic external influences, e. Seasonal variation definition of seasonal variation by. Deviation from type, especially the parent type, in structure, form, physiology, or behavior. Variation definition of variation by merriamwebster.
Relating to, occurring in, or varying with a particular. Variation, in general sense, pertains to the deviations or divergences in a set or a group. Annual variation definition of annual variation by. For example, electric utilities generally experience significant seasonal sales variations in electricity. The annual variation of the water balance can be used as one means of. Seasonal variation in the population of urban birds bharat m. Their analysis found differences in average seasonal distribution patterns between sets of years with different weatherrelated environmental conditions, e. It is an average that can be used to compare an actual observation relative to what it would be if there were no seasonal variation. This can be caused by inherited or environmental factors. Vyas the asian journal of animal science june, 2011, vol. Seasonal means relating to a particular season seasonal fresh fruit or fluctuating or restricted according to the season there are companies whose markets are seasonal, while seasonable is a rarer word which means usual for or appropriate to a particular season in december the magazine carried cartoons and songs.
A sink period, during spring and summer, is attributed to biota photosynthesis exceeding biota respiration. Uses of seasonal variations homework help in statistics. Genetics for classroom materials in our everchanging world, a naturally occurring genetic difference in an individual can become an advantage or a fatal flaw in the struggle for survival. Children aged 111 months had a higher incidence of pneumonia mortality in decemberjanuary rr 1. Any predictable change or pattern in a time series. In time series data, seasonality is the presence of variations that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly. Variation biology article about variation biology by. Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences genotypic variation or by the effect of environmental factors on the expression of the genetic potentials phenotypic variation. Plants regulate their developmental processes depending on these factors. Seasonal variation in the population of urban birds.
Acclimatization, any of the numerous gradual, longterm responses of an organism to changes in its environment. Darwins meticulously documented observations led him to question the then current belief in special creation of each species. As with succession, it can take a bare environment and transform it into a fullyoperational ecosystem. Likewise, toy manufacturers have sales increases before christmas. Variation biology synonyms, variation biology pronunciation, variation biology translation, english dictionary definition of variation biology. Seasonal variation a situation in which a company has better sales in certain times of the year than in other times. Those who live to reproduce pass their favorable genes to future generations variation, in general sense, pertains to the deviations or divergences in a set or a group.
Seasonal variation may affect clinical diagnosis of. In biology, variation refers to the differences or deviations e. Changes in inventory levels, profits, sales volume, etc. Let us make indepth study of the meaning, types and importance of variations in different organisms. Season can be understood in this context to include a seasons of the year and their. Seasonal variation article about seasonal variation by.
Variation biology synonyms, variation biology pronunciation, variation biology. Such responses are more or less habitual and reversible should environmental conditions revert to an earlier state. Seasonal variation synonyms, seasonal variation antonyms. These variations do not involve any hereditary alteration and in general are not transmitted to future generations. Seasonal variation, diversity, bird population abstract a population is a group of interbreeding organisms of the same kind occupying a. Seasonal and daily temperatures seasonal temperature variations what causes the seasons what governs the seasons is the amount of solar radiation reaching the ground what two primary factors determine the amount of radiation reaching the ground. He also originated the concept of functions of bounded variation and is known especially for his definition of the length of a curve. A study of mauna loa seasonal variation of co2 concentration. Variation is the differences between individuals within a species.
Seasonal allergies follow the predictable pattern of occurring when pollen circulates in the air. Questions may require the use of regression to estimate trend. In time series, that part of the movement which is assigned to the effect of the seasons on the year, e. Seasonal business is a term that refers to the fluctuations in business that correspond to changes in season. Seasonal patterns in fecundability in north america and. There seems to be some confusion in these statements in that decay. Seasonal infections, like influenza, are most common in. Variations mean the differences morphological, physiological, cytological and behaviouristic amongst the individuals of the same species and the offspring of the same parents. They are found in all the characters and in every conceivable direction. A knowledge of seasonal variation guides him in purchasing the articles at low prices during the off seasons. Often attributed to photoperiodism, changes which occur in behavioral, psychological, and physiological patterns as seasons vary or in reaction to seasonal. Seasonality is a characteristic of a time series in which the data experiences regular and predictable changes that recur every calendar year. Seasonal variation may affect clinical diagnosis of metabolic syndrome. In the massconserving variation, modulo 3 arithmetic is more useful.
Seasonal variation of heavy metals in selected sea foods from buguma and ekerekana creeks niger delta international journal of innovative studies in aquatic biology and fisheries ijisabf page 50 from automobile such as speed boats that sail predominantly on. If an anticoagulant is added to a specimen of blood and let stand it in a glass tube, the. Oecd glossary of statistical terms seasonal variation. Seasonal variations, and subsequent climate changes, can cause migrations of animals, most commonly found in birds, as they travel to more suitable environments.
Seasonal variation in statistics, many time series exhibit cyclic variation known as seasonality, seasonal variation, periodic variation. Meaning of seasonal variation in the english dictionary. Variation biology definition of variation biology by. It is used in analysing the seasonal pattern in a shortperiod time series.