scholarly journals Plasmodium infection decreases fecundity and increases survival of mosquitoes

2012 ◽  
Vol 279 (1744) ◽  
pp. 4033-4041 ◽  
Author(s):  
J. Vézilier ◽  
A. Nicot ◽  
S. Gandon ◽  
A. Rivero
Keyword(s):  
Life History ◽  
Insecticide Resistance ◽  
Life History Traits ◽  
Experimental System ◽  
Adaptive Strategy ◽  
Genetic Variations ◽  
The Other ◽  
Plasmodium Infection ◽  
Trade Off ◽  
The One

Long-lived mosquitoes maximize the chances of Plasmodium transmission. Yet, in spite of decades of research, the effect of Plasmodium parasites on mosquito longevity remains highly controversial. On the one hand, many studies report shorter lifespans in infected mosquitoes. On the other hand, parallel (but separate) studies show that Plasmodium reduces fecundity and imply that this is an adaptive strategy of the parasite aimed at redirecting resources towards longevity. No study till date has, however, investigated fecundity and longevity in the same individuals to see whether this prediction holds. In this study, we follow for both fecundity and longevity in Plasmodium- infected and uninfected mosquitoes using a novel, albeit natural, experimental system. We also explore whether the genetic variations that arise through the evolution of insecticide resistance modulate the effect of Plasmodium on these two life-history traits. We show that (i) a reduction in fecundity in Plasmodium- infected mosquitoes is accompanied by an increase in longevity; (ii) this increase in longevity arises through a trade-off between reproduction and survival; and (iii) in insecticide-resistant mosquitoes, the slope of this trade-off is steeper when the mosquito is infected by Plasmodium (cost of insecticide resistance).

Energy Reserve Compensating for Trade-Off Between Metabolic Resistance and Life History Traits in the Brown Planthopper (Hemiptera: Delphacidae)

2020 ◽  
Vol 113 (4) ◽  
pp. 1963-1971
Author(s):  
Tomohisa Fujii ◽  
Sachiyo Sanada-Morimura ◽  
Keiichiro Matsukura ◽  
Ho Van Chien ◽  
Le Quoc Cuong ◽  
...  
Keyword(s):  
Life History ◽  
Survival Time ◽  
Life History Traits ◽  
Insect Pest ◽  
Brown Planthopper ◽  
Total Lipid Content ◽  
Metabolic Resistance ◽  
Trade Off ◽  
Metabolic Detoxification ◽  
Resistant Strains

Abstract Development of insecticide resistance often changes life history traits of insect pests, because metabolic detoxification of insecticides in insect bodies requires huge energetic reserves. The brown planthopper, Nilaparvata lugens (Stål), an important insect pest of rice crop in East and Southeast Asia, has developed strong resistance to imidacloprid from mid-2000s. The aim of this study was to examine the costs of life history traits and reveal changes in energy reserves with developing imidacloprid resistance. We compared the life history traits (survival time, fecundity, developmental time, and hatchability) and total lipid content between imidacloprid-resistant and imidacloprid-susceptible (control) brown planthopper strains. As compared to the control strains, adults’ survival time of the resistant females was shorter, and their fecundity was lower; the other life history traits did not differ significantly between the resistant and control strains. As the results, net reproductive rates (R0) were lower in the resistant strains than in the susceptible strains. However, the amount of stored lipids was larger in resistant females than control ones. Our findings demonstrated a physiological trade-off between the development of imidacloprid resistance and the reproductive traits of brown planthopper. The imidacloprid-resistant strains are likely to store lipids for metabolic detoxification rather than consume them for reproduction.

The Biology of the Genus Pissodes. (George Heriot Research Fellowship Thesis.)

1902 ◽  
Vol 23 ◽  
pp. 319-358
Author(s):  
R. Stewart MacDougall
Keyword(s):  
Life History ◽  
Economic Importance ◽  
The Other ◽  
Remedial Measures ◽  
Research Fellowship ◽  
History Of ◽  
The One ◽  
Harmful Insect

In the case of any harmful insect of economic importance, in order to war against it, or apply remedial measures at all intelligently, a knowledge of the life-history of the pest is necessary. This proposition will, I think, meet with such ready acceptance as to render proof unnecessary, but I might in illustration mention two cases which came under my own observation, where in the one case a knowledge of the round of life of the attacking insect saved a whole forest, and in the other proved of great importance.

scholarly journals Warmer temperatures attenuate the classic offspring number and reproductive investment trade-off in the common lizard, Zootoca vivipara

2016 ◽  
Vol 12 (6) ◽  
pp. 20160101 ◽  
Author(s):  
Alexis Rutschmann ◽  
Donald B. Miles ◽  
Jean Clobert ◽  
Murielle Richard
Keyword(s):  
Life History ◽  
Environmental Conditions ◽  
Life History Traits ◽  
Natural Populations ◽  
Trade Off ◽  
Offspring Number ◽  
Common Lizard ◽  
Trade Offs ◽  
Zootoca Vivipara ◽  
The Common

Life-history traits involved in trade-offs are known to vary with environmental conditions. Here, we evaluate the response of the trade-off between ‘offspring number’ versus ‘energy invested per offspring’ to ambient temperature in 11 natural populations of the common lizard, Zootoca vivipara . We provide evidence at both the intra- and interpopulation levels that the trade-off is reduced with an increase in air temperature. If this effect enhances current individual fitness, it may lead to an accelerated pace of life in warmer environments and could ultimately increase adult mortality. In the context of global warming, our results advocate the need for more studies in natural populations to explore interactions between life-history traits' trade-offs and environmental conditions.

Biography and (Global) Microhistory

2017 ◽  
Vol 11 (3) ◽  
Author(s):  
Mark Gamsa
Keyword(s):  
Life History ◽  
Northeast China ◽  
The Other ◽  
Historical Writing ◽  
Forthcoming Book ◽  
Recent Developments ◽  
History Of ◽  
German Origin ◽  
The One ◽  
The City

AbstractThis article has two goals. It reflects on the recent developments and agenda of an approach to historical writing that is now becoming known by the name global microhistory, and it analyses the attention which this approach pays to individual lives. It also explores some of the challenges in writing the biography of a city alongside the life history of a person. The city is Harbin, a former Russian-managed railway hub in Manchuria, today a province capital in Northeast China. The person is Baron Roger Budberg (1867–1926), a physician of Baltic German origin who arrived in Harbin during the Russo-Japanese war and remained there until his death, leaving published works and unpublished correspondence in German and Russian. My forthcoming book about Budberg and Harbin challenges the distinction between writing “biography”, on the one hand, and “history”, on the other, while navigating between the “micro” and “macro” layers of historical enquiry.

scholarly journals Determinants of life-history traits in a fish ectoparasite: a hierarchical analysis

Parasitology ◽  
2011 ◽  
Vol 138 (7) ◽  
pp. 848-857 ◽  
Author(s):  
G. LOOT ◽  
N. POULET ◽  
S. BROSSE ◽  
L. TUDESQUE ◽  
F. THOMAS ◽  
...  
Keyword(s):  
Life History ◽  
Body Size ◽  
Egg Size ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Individual Characteristics ◽  
Trade Off ◽  
Individual Fitness ◽  
Parasite Number ◽  
Egg Number

SUMMARYObjective. Unravelling the determinants of parasite life-history traits in natural settings is complex. Here, we deciphered the relationships between biotic, abiotic factors and the variation in 4 life-history traits (body size, egg presence, egg number and egg size) in the fish ectoparasite Tracheliastes polycolpus. We then determined the factors affecting the strength of the trade-off between egg number and egg size. Methods. To do so, we used 4-level (parasite, microhabitat, host and environment) hierarchical models coupled to a field database. Results. Variation in life-history traits was mostly due to individual characteristics measured at the parasite level. At the microhabitat level (fins of fish hosts), parasite number was positively related to body size, egg presence and egg number. Higher parasite number on fins was positively associated with individual parasite fitness. At the host level, host body size was positively related to the individual fitness of the parasite; parasites were bigger and more fecund on bigger hosts. In contrast, factors measured at the environmental level had a weak influence on life-history traits. Finally, a site-dependent trade-off between egg number and egg size existed in this population. Conclusion. Our study illustrates the importance of considering parasite life-history traits in a hierarchical framework to decipher complex links between biotic, abiotic factors and parasite life-history traits.

Optimal Contracting Model in a Social Environment and Trust-Related Psychological Costs

2013 ◽  
Vol 13 (1) ◽  
pp. 271-284 ◽  
Author(s):  
Suren Basov ◽  
M. Ishaq Bhatti
Keyword(s):  
Social Norms ◽  
Social Environment ◽  
Point Of View ◽  
The Other ◽  
Trade Off ◽  
Optimal Contracting ◽  
The Social ◽  
The One ◽  
Contracting Model

AbstractMost research in contract theory concentrated on the role of incentives in shaping individual behavior. Recent research suggests that social norms also play an important role. From a point of view of a mechanism designer (a principal, a government, and a bank), responsiveness of an agent to the social norms is both a blessing and a curse. On the one hand, it provides the designer with extra instruments, while on the other it puts restrictions on how these new and the more conventional instruments can be used. The main objective of this paper is to investigate this trade-off and study how it shapes different contracts observed in the real world. We consider a model in which agent’s cost of cheating is triggered by the principal’s show of trust. We call such behavior a norm of honesty and trust and show that it drives incentives to be either low powerful or high powerful, eliminating contracts with medium powerful incentives.

A Dynamic Model Balancing User Control and Workload in Automatic and Adaptive Systems

2007 ◽  
Vol 51 (4) ◽  
pp. 186-190
Author(s):  
Shelley Roberts ◽  
Avi Parush
Keyword(s):  
User Interfaces ◽  
Adaptive Systems ◽  
Interactive Systems ◽  
The Other ◽  
Dynamic Changes ◽  
Trade Off ◽  
Controlled Systems ◽  
Adaptive User Interfaces ◽  
Interface Adaptation ◽  
The One

Current interactive systems are criticized for having complex interfaces that overload users with information. Two possible solutions to manage overload are automatic interfaces that augment user capabilities, and user-controlled systems that provide support. These two types of interfaces introduce a trade-off: On the one hand, automatic interfaces alleviate workload but create performance problems associated with the absence of control. On the other hand, user-controlled interfaces afford users more control, which may come with additional workload. Based on the analysis of adaptive user interfaces and automation, a model is proposed where automatic and user interface adaptation are in a multidimensional and continuum-based space, allowing for modelling dynamic changes to the roles the human and machine play at various stages of interaction.

Mutational divergence of life-history traits in an obligate parthenogen

Genome ◽  
1994 ◽  
Vol 37 (1) ◽  
pp. 33-35 ◽  
Author(s):  
C. Anna Toline ◽  
Michael Lynch
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Sole Source ◽  
Morphological Characters ◽  
The Other ◽  
Life History Trait ◽  
Adaptive Changes ◽  
Significant Divergence ◽  
Polygenic Variation

Three lines of obligately parthenogenetic Daphnia were allowed to diverge for a 4-year period (approximately 150 generations) with mutation as the sole source of variability. Life-history traits and morphological characters were then surveyed for between-line differences. Significant divergence was found with respect to both number and size of offspring, with no difference in total offspring biomass. No significant differences were found in any of the other characters. These results confirm the hypothesis that purely asexual lines can accumulate enough polygenic variation via mutation to support potentially adaptive changes on a microevolutionary time scale.Key words: Daphnia, life-history trait, mutational divergence, microevolution.

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