Population Dynamics and the evolution of phenotypic plasticity: Experimental Adaptive Dynamics.
Lead Research Organisation:
University of Liverpool
Department Name: Sch of Biological Sciences
Abstract
The ability of an animal or plant to survive is dependent on their ability to deal with things like temperature, rainfall, predators and parasites. Some animals and plants are able to recognize changes in the habitat that they live in and change accordingly. These may include things like how active an animal is, how much they eat, how fast they grow, how many offspring they have, or even how they develop. For example, when water fleas grow up in a habitat in which fish are present they develop head and tail spines that make it harder for a fish to eat them, however these spines are not produced when fish are absent. This ability of an animal to change what they do depending upon their surroundings is called phenotypic plasticity. How plastic can an animal or plant be? In a perfect world, an organism that had unlimited plasticity could potentially live anywhere. However, this is not what we generally observe. The distribution of most plants and animals is constrained to some degree. Moreover, plants and animals that live in environments that don't change very much are generally less plastic. One reason for this could be that there are costs of being plastic as well as benefits. This work aims to examine what these costs of plasticity are. Before we can do this, we first have to define what a plastic animal is. This is not as easy as it sounds because in any animal some characteristics may be more plastic than others. For example, dragonflies that hatch late in the season reduce their body size (plastic) in order to always be able to develop as quickly as possible (not plastic). At present we have very little idea how plasticity in one characteristic is related to plasticity in others. This means that we have to measure the way that animals change many characteristics in different environments before we can compare the plasticity of one organism with another. In the first part of this project, I will compare the extent that different clones (individuals with identical genes) of a water flea change their feeding rate, growth, reproduction and survival in high and low food environments. This will enable me to (1) determine how plastic responses in different characteristics are related to each other, and (2) determine whether some clones show more overall plasticity (all characteristics) than others in response to a change in food availability. In the second part of the project, I will test the idea that being plastic is costly in some environments. Normally trying to measure how a particular characteristic of an organism influences its success in any environment is extremely difficult. The advantage of studying water fleas is that they reproduce so quickly (10 days) I can directly compete plastic and non-plastic clones against each other over many generations. In this way, the success of a particular clone in any environment can be measured as its ability to replace another clone. Using these sorts of population competition experiments I will examine whether plastic clones can replace non-plastic clones in a variable environment and whether non-plastic clones can replace plastic clones in a constant environment as would be expected if being plastic is costly.
Publications
Benton TG
(2008)
Maternal effects mediated by maternal age: from life histories to population dynamics.
in The Journal of animal ecology
Plaistow SJ
(2009)
The influence of context-dependent maternal effects on population dynamics: an experimental test.
in Philosophical transactions of the Royal Society of London. Series B, Biological sciences
Plaistow SJ
(2014)
Phenotypic integration plasticity in Daphnia magna: an integral facet of G × E interactions.
in Journal of evolutionary biology
Description | Phenotypic plastcity referes to the ability of an organism to produce different phenotypes depending upon the environments they encounter. Understanding of plasticity was developed for single traits, yet organisms are phenotypically integrated meaning that actually most examples of plasticity are multi-trait in nature. In this grant we have developed a methodology for qualifying and quantifying differences in multivariate plasticity. We have shown that in Daphnia magna, variation in plasticity between different genotypes comes mainly from differences in the relative investment in different traits RATHER than differences in the magnitude of overall plasticity. We have developed Daphnia as an ideal model system for studying the evolutionary and ecological consequences of differences in multivariate plasticity and we have established a lab working on the genetic basis underpinning variation in plasticity. |
Exploitation Route | Our finding may be important for understanding how organisms rapidly adapt to their environment. There is an increasing suggestion that often plastic responses may be the first response to novel environments and dictate the first evolutionary responses. The work completed in this grant led directly to our next NERC grant examining how non-genetic inheritance transmits effects of pollution exposure across generations. |
Sectors | Agriculture, Food and Drink,Environment |
URL | http://pcwww.liv.ac.uk/~stewp123/home/index.html |
Description | I am using some of the techniques developed in this grant in a new collaboration with other researchers at Liverpool and Geoff Hodges at UNILEVER to link molecular initiating events to population level processes following exposure to pollutants. |
First Year Of Impact | 2014 |
Sector | Environment |
Description | CER visiting professor position, Kyoto |
Amount | £20,000 (GBP) |
Organisation | University of Kyoto |
Sector | Academic/University |
Country | Japan |
Start | 06/2011 |
End | 08/2011 |
Description | NERC MGF Small Project Grant |
Amount | £5,000 (GBP) |
Organisation | Natural Environment Research Council |
Sector | Public |
Country | United Kingdom |
Start | 01/2009 |
Description | NERC PhD studentship |
Amount | £49,000 (GBP) |
Organisation | Natural Environment Research Council |
Sector | Public |
Country | United Kingdom |
Start | 10/2008 |
End | 10/2012 |
Description | Royal society travel grant |
Amount | £1,100 (GBP) |
Funding ID | 2008/R1 |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 08/2008 |
End | 08/2008 |
Description | John Colbourne (Daphnia genomics consortium) |
Organisation | University of Birmingham |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | We carried out a transcriptomic experiment to investigate maternal control of offspring development |
Collaborator Contribution | He designed the microarray and helped with analysis |
Impact | Plaistow, S.J., Colbourne, J. & Paterson, S. (2014) Using gene expression to understand mother-offspring interactions and the control of offspring development in Daphnia pulex (manuscript) |
Start Year | 2010 |