25 janvier 2024

BEEPs: Jose Noguera: Telomeres in the ocean & plasticity in the grassland: Exploring the Environmental Drivers of Aging, Underlying Mechanisms, and Evolutionary Consequences through the Study of Seabirds and Field Crickets

In this seminar, I will begin by discussing the mechanisms of ageing, with a particular focus on telomeres. Specifically, I will examine how different environmental conditions during pre-and post-natal development affect telomere length and dynamics in the yellow-legged gull, Larus michahellis. I will present results from our recent studies investigating the role of maternal glucocorticoids, exposure to prenatal social stressors (e.g. predation risk) and microbiome development in influencing postnatal telomere dynamics and telomere repair mechanisms. For example, our results suggest that mothers can increase telomere length in their offspring by moderately increasing the amount of glucocorticoids (i.e. corticosterone) in their eggs. However, complementary evidence suggests that endogenous glucocorticoid production in response to stressors, such as predation risk, comes at the cost of loss of telomere length. I will also show how the development of the gut microbiome early in life is related to telomere length in the early postnatal period. In the second part of the seminar, I will focus on a different animal model, the Mediterranean field cricket, Gryllus bimaculatus. I will use this invertebrate species to illustrate the links between sex, plasticity and ageing. I will highlight several examples of how the adult sociosexual environment can induce plasticity in the allocation strategies between traits under pre- and post-copulatory sexual selection, and the implications of such changes for lifespan and ageing rates.


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25 janvier 2024, 11h0012h00

Début : 25/01/2024 à 11:00
Fin : 25/01/2024 à 12:00

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18 avril 2024

BEEPs: Ragavendra Gadkar: The Establishment and Maintenance of Division of Labour in the Indian Paper Wasp Ropalidia marginata

The Establishment and Maintenance of Division of Labour in the Indian Paper Wasp Ropalidia marginataRaghavendra GadagkarDST Year of Science Chair Professor, Centre for Ecological Sciences, Indian Institute of Science, Bangalorehttps://sites.google.com/view/raghavendragadagkar  Social insects such as ants, bees, wasps, and termites have achieved unparalleled ecological success, dominating terrestrial ecosystems worldwide. A significant factor that has made this possible is their efficient division of labour. Firstly, they exhibit a reproductive division of labour such that only one or a small number of individuals reproduce, leaving the remaining sterile workers free to undertake the tasks of nest building, colony defence, brood care and foraging. Secondly, they also exhibit non-reproductive division of labour such that different sub-groups of workers specialize in undertaking sub-sets of non-reproductive tasks. The twin benefits of task specialization and parallel processing help them to outperform their solitary counterparts. Using the Indian paper Ropalidia marginata, we have attempted to under how reproductive and non-reproductive division of labour are established in newly founded colonies and maintained in established colonies with many new-generation individuals. Topic: Zoom meeting - DEPE animation scientifique - BEEPS Join Zoom Meetinghttps://cnrs.zoom.us/j/92785456777?pwd=NU1FQzdwVTFERXZqMG5LRXJRSUlQZz09 Meeting ID: 927 8545 6777Passcode: LT1fEU https://indico.in2p3.fr/event/31859/