Encontros Scientia

Polyandry and host-endosymbiont conflicts in the spider mite Tetranychus urticae

Sala 2.2.14, FCUL, Lisboa

Por Leonor R Rodrigues (1,2), F. Zélé (1), I. Santos (1), A. Figueiredo (1,3,4), J. Alpedrinha (1), I. Olivieri (2), S. Magalhães (1).

(1) cE3c: Centre for Ecology, Evolution and Environmental Changes, Faculty of Sciences, University of Lisbon (2) ISEM, Institut des Sciences de l’Evolution Montpellier, UMR 5554 (Université de Montpellier/CNRS/IRD), Place Eugène Bataillon 34095 Montpellier Cedex 05, France; (3) Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland; (4) Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.

In species with first male sperm precedence, the first male that mates with a female will sire all her offspring. Consequently, it seems paradoxical that females mate multiply, except (a) if this behaviour occurs inadvertently, (b) if it provides an advantage for females or males, or (c) if it correlates with other traits. To tackle this issue, we studied the spider mite Tetranychus urticae, a haplodiploid species with first male sperm precedence in which polyandry is pervasive.
First, we found that males preferred virgin over mated females and used chemical cues to distinguish them. These results indicate that polyandry does not occur due to a lack of ability to discriminate females of different matings status, suggesting that polyandry should be beneficial for at least one sex. However, females did not benefit directly with polyandry. In fact, females that mated multiple times survived less and laid fewer eggs, compared to females that mated once or twice only, suggesting that multiple mating is costly. Nevertheless, males mating with mated females obtained an indirect benefit with this behaviour, by decreasing the production of daughters sired by first males. Furthermore, we found that females evolved the ability to avoid incompatible crosses by mating multiple times. This occurred after 20 generations of experimental evolution, in a scenario of mixed infection by Wolbachia, an endosymbiotic bacterium that induces cytoplasmic incompatibility (CI), whereby crosses between uninfected females and infected males yield reduced fertilized offspring. To avoid this cost, spider mites break their sperm priority pattern in favour of the second male.
Overall, our results contribute to improve the understanding of mating strategies, namely the putative drivers of multiple mating in species with first male sperm precedence.

12h00-13h00
cE3c - Centro de Ecologia, Evolução e Alterações Ambientais

A sessão final da mais recente edição da cadeira Projeto Empresarial terá lugar no dia 22 de junho.

Logótipo da redeAGRO

As alterações climáticas são um dos maiores desafios que a humanidade enfrenta.

Ângela Duarte Henriques apresenta o trabalho de projeto "Cash Back Program".

Cursos Avançados cE3c 2017/2018

This course offers an overview of the different ways to measure biodiversity, and provides tips for the stratification of primary biodiversity data and the construction of variables that describe its various facets.

Por Angus Macintyre (Queen Mary, University of London) (Emeritus).

Oficina Ciência e Império na Era da Descolonização

O Ciência e Império de 2017-2018 irá concluir com um dia inteiro de conferências e debates, no ICS. Para participar, inscreva-se através do e-mail cienciaimperio@gmail.com.

Por Aymeric Baradat (École Polytechnique, Paris).

Diogo Loureiro Caetano defende a dissertação "Linear stability for differential equations with infinite delay via semigroup theory".

Encontro dirigido a profissionais e utilizadores de Estatística, académicos, investigadores e estudantes. 
 

Por Vinicius Bastazini (Post doctoral research fellow at CNRS Theoretical and Experimental Ecology Station, Moulis, France).

Por Luisa Fiorot (Università degli Studi di Padova).

Ciência 2018 - Encontro com a Ciência e Tecnologia em Portugal

A iniciativa procura debater os principais temas e desafios da agenda científica, estimulando a participação e a interação entre investigadores, setor empresarial e público em geral.

Verão na ULisboa 2018

A edição de 2018 da iniciativa Verão na ULisboa decorre nas semanas de 02 a 06 de julho (alunos do 10.º,11.º e 12.º ano) e de 9 a 13 de julho (alunos do 7.º, 8.º e 9.º ano).

Escola de Verão de Energia

Imagina que era possível experimentar um curso universitário antes de concorreres ao ensino superior.

Cursos Avançados cE3c 2017/2018

The goal of this short course is to introduce the students to the main climate change research concepts and prepare them to use available information on scenarios, impacts and adaptation.

Specific goals include:

Por Marco Masoero (Université Paris-Dauphine).

IMMR'18 - International Meeting on Marine Research 2018

The IMMR’18 is an international congress planned to communicate novel scientific knowledge on marine resources and research towards the sustainability of our planet.

Com a realização deste evento, pretende-se criar um ponto de encontro onde os primatólogos portugueses e/ou lusófonos possam trocar conhecimentos e contactos, e também criar um veículo de comunicação em português entre cientistas e cidadãos.

Hands-on Workshop on High-Throughput Microscopy

Participants will learn the basic principles of High-Throughput Microscopy (HTM) applied to RNAi and drug screening.

Frontiers in E3: cE3c Annual Meeting

In this annual event, cE3c researchers gather together to present and discuss their latest projects, scientific results and outreach initiatives, and explore novel ideas.

This joint conference will be organized by SPQ (Sociedade Portuguesa de Química) in collaboration with SEQA (Sociedad Española de Química Analítica), SEDOPTICA (Comité de Espectroscopia de la Sociedad Española de Óptica) and SEA (Sociedad de Espectroscopia Aplicada).

Cursos Avançados cE3c 2017/2018

The Lichens course is a 4 days lectures and lab classes + one day field excursion.

Candidaturas aos Prémios Científicos Universidade de Lisboa / Caixa Geral de Depósitos

Estão abertas até 10 de julho as candidaturas aos Prémios Científicos Universidade de Lisboa / Caixa Geral de Depósitos de estímulo à publicação de artigos científicos.

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