The inland water fishes of Africa
| Didier Paugy
, Christian Levêque
, Olga Otero
Life-history strategies
Didier Paugy, Christian Levêque et Fabrice Duponchelle
Résumé
The biological and demographic profile of a population is defined by a set of biological traits such as age or size at first reproduction, fecundity rate, lifespan, mortality rate of each age group, etc. This demographic profile represents a certain adaptation of a population to its environment. The theory of adaptive strategies is based on the assumption that demographic, ecological, ethological and physiological features of a population are co-adapted and modelled by natural selection.
Since environmental changes are continuous, each state of adaptation is only provisional, and the sustainability of a species depends on its aptitude for adapting its demographic strategy to new environmental conditions in order to maintain large populations.
Over the last forty years, several studies have tried to explain the origin of variability of characters among organisms. The various methods of reproduction and their degrees of success in various environments thus formed a basis for theoretical and empirical research referred to as “life history”.
Life history studies attempt to explain the trade-off between reproductive and demographic parameters (Stearns, 1983a; Reznick, 1985; Pease & Bull, 1988) in relation to various environmental conditions (Whittaker & Goodman, 1979; Winnemiller & Rose, 1992).
Les formats HTML, PDF et ePub de cet ouvrage sont accessibles aux usagers des bibliothèques et institutions qui l'ont acquis dans le cadre de l'offre OpenEdition Freemium for Books. L'ouvrage pourra également être acheté sur les sites de nos libraires partenaires, aux formats PDF et ePub. Si l’édition papier est disponible, des liens vers les librairies sont également proposés sur cette page.
Extrait du texte
Resource allocation: constraints and compromises
One of the principal ideas of the concept of demographic strategy is that various biological features are interdependent. A fundamental point is the comprehension of how and to what point an organism is willing to invest into each bio-demographic option in order to optimize the use of the resources and their distribution among its various fundamental needs. In other words, each organism has limited time and energy to survive and reproduce. What is thus the ideal resource partition in regards to time and energy for growth, maintenance and reproduction? This allocation of energy among these requirements must be equitable in order to enable the species to optimize the success of its reproduction.
The current theories consider that the evolution of biological features generally involve compromise. An increase in the time (or energy) devoted to an activity will be done at other activities’ expense. Thus, for a similar availability of resourc...
Auteurs
Research director at IRD. He has published numerous works on the systematics, distribution, and ecology of West African fresh water fishes, and expanded the collections of the MNHN in Paris.
Research director at IRD. He has published numerous works on the systematics, distribution, and ecology of West African fresh water fishes, and expanded the collections of the MNHN in Paris.
The inland water fishes of Africa
Diversity, ecology and human use
Didier Paugy, Christian Levêque et Olga Otero (dir.)
…
Vérifiez si votre institution a déjà acquis ce livre : authentifiez-vous à OpenEdition Freemium for Books.
Vous pouvez suggérer à votre bibliothèque/établissement d’acquérir un ou plusieurs livres publié(s) sur OpenEdition Books.
N'hésitez pas à lui indiquer nos coordonnées :
OpenEdition - Service Freemium
access@openedition.org
22 rue John Maynard Keynes Bat. C - 13013 Marseille France
Vous pouvez également nous indiquer à l'aide du formulaire suivant les coordonnées de votre institution ou de votre bibliothèque afin que nous les contactions pour leur suggérer l’achat de ce livre.
Merci, nous transmettrons rapidement votre demande à votre bibliothèque.
The inland water fishes of Africa
Diversity, ecology and human use
Référence électronique du chapitre
PAUGY, Didier ; LEVÊQUE, Christian ; et DUPONCHELLE, Fabrice. Life-history strategies In : The inland water fishes of Africa : Diversity, ecology and human use [en ligne]. Marseille : IRD Éditions, 2017 (généré le 17 janvier 2021). Disponible sur Internet : <http://books.openedition.org/irdeditions/25205>. ISBN : 9782709924016. DOI : https://doi.org/10.4000/books.irdeditions.25205.
Paugy, D., Levêque, C., & Duponchelle, F. 2017. Life-history strategies. In Paugy, D., Levêque, C., & Otero, O. (Eds.), The inland water fishes of Africa : Diversity, ecology and human use. IRD Éditions. doi :10.4000/books.irdeditions.25205
Paugy, Didier, et al.. “Life-history strategies”. Paugy, Didier, et al.. The inland water fishes of Africa : Diversity, ecology and human use. Marseille : IRD Éditions, 2017. (pp. 177-188) Web. <http://books.openedition.org/irdeditions/25205>.
Référence électronique du livre
PAUGY, Didier (dir.) ; LEVÊQUE, Christian (dir.) ; et OTERO, Olga (dir.). The inland water fishes of Africa : Diversity, ecology and human use. Nouvelle édition [en ligne]. Marseille : IRD Éditions, 2017 (généré le 17 janvier 2021). Disponible sur Internet : <http://books.openedition.org/irdeditions/25130>. ISBN : 9782709924016. DOI : https://doi.org/10.4000/books.irdeditions.25130.
Paugy, D., Levêque, C., & Otero, O. (Eds.) 2017. The inland water fishes of Africa : Diversity, ecology and human use. IRD Éditions. doi :10.4000/books.irdeditions.25130
Paugy, Didier, et al., ed. The inland water fishes of Africa : Diversity, ecology and human use. Marseille : IRD Éditions, 2017. Web. <http://books.openedition.org/irdeditions/25130>.
Compatible avec Zotero
The inland water fishes of Africa
Diversity, ecology and human use
Didier Paugy, Christian Levêque et Olga Otero (dir.)
…
Life-history strategies
Didier Paugy, Christian Levêque et Fabrice Duponchelle
Partager
Merci, votre message a été envoyé.
Collez le code html suivant pour intégrer ce livre sur votre site.