Age-specific growth, reproductive values, and intrinsic r

نویسنده

  • Robert Schoen
چکیده

The age-specific growth function of an observed population and the reproductive value function based on the population’s current vital rates determine the intrinsic rate of growth implied by those vital rates through the simple relationship given in equation (1). That equation establishes the analytical significance of age-specific growth, and leads to relationships that quantify a population’s approach to stability and that specify the extraordinarily close connection between reproductive values and population momentum. 1 Population Research Institute, Pennsylvania State University, University Park, PA 16802 USA. Mailing address: 3145 Turk Blvd, #103, San Francisco, CA 94118 USA. E-mail: [email protected]. http://www.demographic-research.org 825 Schoen: Age-specific growth, reproductive values, and intrinsic r

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effect of substitute milk on growth and breeding rates of hysterectomy derived guinea pigs neonates

In this study, considering the normal ingredients in guinea pig's milk, by using cow milk, mixture of vitamins and minerals, a milk substitute was prepared and sterilized by autoclaving and filtration methods. In food analysis of produced milk, the important substances values, such as protein, fat and ash, were suitable. Milk substitute was fed to four groups of newborn's guinea pigs that were ...

متن کامل

Age-stage, two-sex life table of Parapoynx crisonalis (Lepidoptera: Pyralidae) at different temperatures

Parapoynx crisonalis is an important pest of many aquatic vegetables including water chestnuts. Understanding the relationship between temperature variations and the population growth rates of P. crisonalis is essential to predicting its population dynamics in water chestnuts ponds. These relationships were examined in this study based on the age-stage, two-sex life table of P. crisonalis devel...

متن کامل

Differences in life history characteristics between two sibling species in Brachionus calyciflorus complex from tropical shallow lakes

The studies of differences in life history and suitability of both water temperatures and trophic levels among rotifer sibling species improve our understanding of speciation, sibling species coexistence and possible niche differentiation over space and time, and consequences for the functioning of ecosystems induced by climate change and eutrophication. We collected Brachionus calyciflorus fro...

متن کامل

Are the reproductive traits of two populations of P. quatuordecimpunctata affected by the geographic conditions and the prey species?

Life history parameters of the ladybird populations, Propylea quatuordecimpunctata (L.) (Coleoptera: Coccinellidae), collected at two locations in Iran (Karaj and Sari) were recorded on two prey species, Aphis fabae Scopoli, 1763 and Aphis gossypii Glover, 1877 (Homoptera: Aphididae). The duration of most developmental stages (egg, first, second and third instar larva...

متن کامل

مقایسه باروری ، طول دوره رشد و طول عمر شته گردو [Chromaphis juglandicola (Kalt.)] و زنبور پارازیتویید آن [Trioxys pallidus(Hal.)]

Fertility, developmental time and adult longevity of walnut aphid, Chromaphis juglandicola (Kalt.) and its parasitoid wasp, Trioxys pallidus (Hal.) were studied under controlled conditions with a constant temperature of 26±2oC, relative humidity of 60±5%, and 16:8 (L:D) photoperiod. Populations of walnut aphid and parasitoid wasp were reared on walnut seedling in a growth chamber. The mean deve...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2011