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

Por José Paulo Viana (APM - Associação de Professores de Matemática).

During recent decades we have witnessed a great development of bioinformatics that has led to the accumulation of a huge amount of biological information.

Por Luís Margalho (Departamento de Física e Matemática, Instituto Superior de Engenharia de Coimbra).

Por Mario Yanez.

Mario Yanez is dedicated to envisioning and inspiring a transition toward life-sustaining, resilient human communities.

Por Jorge Gomes (LIP).

Por Ana Isabel Queiroz (IHC, FCSH NOVA).

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).

Por Davide Zucco (Università di Torino).

Beatriz Ferraz Marreiros defende o trabalho de projeto "Uma visão sobre uma forma de retenção de clientes nos seguros automóveis".

Por José Espírito Santo (Universidade do Minho).

Por Marco Silva Mendes (FCUL).

Candidaturas a Bolsas de Doutoramento até 20 de janeiro de 2018.

Mais informações disponíveis em http://biodiv.pt/call-2017-18.

The objective of this course is to introduce participants to the details of communication and writing scientific publications. The main emphasis is on the most common form, the “primary scientific paper”, but other forms will be covered.

Estes seminários destinam-se à apresentação e discussão de estudos de caso em história de cultura material e coleções científicas, museus universitários e património científico em geral.

A organização da informação referente à produção científica e dos ficheiros que lhes estão associados implica, cada vez mais, a utilização de aplicações que permitam gerir a descrição e o arquivo dos documentos.

Phylogenetics is one of the scientific areas of Biology that has grown fast and evolved in methodological terms in the last years.

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Por Jacek Radwan (Evolutionary Biology Group, Collegium Biologicum, Adam Mickiewicz University in Poznań).

On completion of the course, the students shall have acquired the following knowledge and understanding:

Aprender a produzir energia, descobrir como se forma a maior onda surfada em todo o mundo ou perceber como podemos falar com um robô, são apenas alguns dos desafios lançados pela Universidade de Lisboa (ULisboa) aos visitantes da exposição “Descobre a ULisboa”.

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The course starts with a short revision of multiple linear regression and generalised linear models, followed by an introduction to linear mixed effects models and generalised linear mixed effects models (GLMM) to analyse nested (also called hierarchical or clustered) data, e.g

Estes cursos breves, dirigidos aos alunos de licenciatura (e mestrado) em Biologia da FCUL, têm como objetivo complementar o seu plano curricular e a oferta já existente para este público-alvo, e decorrem sobretudo aos fins de semana e feriados para evitar sobreposição com

Candidaturas abertas até 28 de fevereiro de 2018.

Estes cursos breves, dirigidos aos alunos de licenciatura (e mestrado) em Biologia da FCUL, têm como objetivo complementar o seu plano curricular e a oferta já existente para este público-alvo, e decorrem sobretudo aos fins de semana e feriados para evitar sobreposição com

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