R And K Strategies Pdf

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r and k strategies pdf

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The focus on either an increased quantity of offspring at the expense of individual parental investment of r-strategists, or on a reduced quantity of offspring with a corresponding increased parental investment of K -strategists, varies widely, seemingly to promote success in particular environments. The concepts of quantity or quality offspring are sometimes referred to as "cheap" or "expensive", a comment on the expendable nature of the offspring and parental commitment made. An unstable environment would encourage the parent to make many offspring, because the likelihood of all of the majority of them surviving to adulthood is slim. In contrast, more stable environments allow parents to confidently invest in one offspring because they are more likely to survive to adulthood.

The meanings of r- and K-selection

We love to hear from you! Leave us a comment. Maintained by BiologyExams4U. Biology Exams 4 U. Biology Exam Preparation Portal. Preparing with U 4 ur exams Difference between r and K Selection.

This paper catalogues several different dichotomies that have all been termed r- and K-selection. The status of the concept of r- and K-selection is discussed and a more restricted usage of the terms is recommended. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve. Solidago, Compositae.

The meanings of r- and K-selection

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Reproduction is a defining process of biological systems. Every generation, across all species, breeding females repopulate ecosystems with offspring. Here, I introduce a species classification scheme that extends the reach of r-K selection and CSR selection by linking breeder investments in offspring quantity, quality, and diversity to specific natural selection pressures.

The concept of r and K strategems and their development during the evolution of organisms is certainly not new, although these particular terms to describe the process have been used for only a short period of time. As a matter of fact, the concept is implicit in some of the writings of Charles Darwin, among others. But, however old the basic theory is, there is presently a great deal of uncertainty as to how important these stratagems are in the functioning of organisms within ecological communities. Unable to display preview. Download preview PDF. Skip to main content.

On r- and K-Selection

In the equations describing growth of populations of organisms, r represents the slope of the line representing exponential growth. The letter K represents the carrying capacity of a habitat for members of a given sort of organism. The terms r-selection and K-selection have also been used by ecologists to describe the growth and reproductive strategies of various organisms.

И это понятно, - подумала.  - Никакой вирус Хейла не волнует, он ведь отлично знает, что происходит с ТРАНСТЕКСТОМ. Но Чатрукьян стоял на .

The meanings of r- and K-selection

 - Насколько я знаю Стратмора, это его дела. Готова спорить на любые деньги, что он. Чутье мне подсказывает.  - Второе, что никогда не ставилось под сомнение, - это чутье Мидж.  - Идем, - сказала она, вставая.  - Выясним, права ли .

 Дэвид. - Привет, красавица.  - Он улыбнулся. - Возвращайся домой.

Но если он посмотрит на монитор и увидит в окне отсчета значение семнадцать часов, то, будьте уверены, не промолчит. Стратмор задумался. - С какой стати он должен на него смотреть? - спросил. Сьюзан взглянула ему в. - Вы хотите отправить его домой. - Нет. Пусть остается.


  1. Juvencia S. 14.05.2021 at 15:59

    The four mentioned strategies may represent a strong suggestion for the categorization of such organisms as r strategists (Parry ; Ortuño.

  2. Lizbeth M. 17.05.2021 at 13:55

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  3. ValГ©rie D. 20.05.2021 at 23:30

    PDF | The theory of r- and K-selection was one of the first predictive models for sify life histories as strategies simplified the otherwise.

  4. Gustave C. 21.05.2021 at 04:07

    Introduction : An organism's Darwinian fitness is calculated as the number of offspring it leaves behind that, themselves, survive to reproduce.