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1. Accounting for competition in multi-environment tree genetic evaluations: a case study with hybrid pines

Author

Nuno Borralho, Eduardo P. Cappa, Ector Belaber, Maria Elena Gauchat, Cristian Damián Schoffen, Facundo Muñoz, Leopoldo Sanchez, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET), Animal, Santé, Territoires, Risques et Ecosystèmes (UMR ASTRE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Département Systèmes Biologiques (Cirad-BIOS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), RAIZ – Forestry & Paper Research Institut, Instituto Superior Técnico, Universidade Técnica de Lisboa, Biologie intégrée pour la valorisation de la diversité des Arbres et de la Forêt (BioForA), Office National des Forêts (ONF)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and This study was funded by the National Institute of Agricultural Technology (INTA) (grant numbers PNFOR-01104062, MSNES-1242204/5). E.P.C.’s research was partially supported by the National Agency for the Promotion of Science and Technology of Argentina (ANPCYT, PICT-2016 1048). F.M.’s research is partially supported by research grant MTM2016-77501-P from the State Research Agency of the Spanish Ministry of Science, Innovation and Universities jointly with the European Regional Development Fund, FEDER.

Subjects
Additive and competition genotype–environment interaction, 0106 biological sciences, Mixed model, [SDV]Life Sciences [q-bio], media_common.quotation_subject, Accounting, Tree breeding, 010603 evolutionary biology, 01 natural sciences, Genetic correlation, Competition (biology), Competition model, Genetic variation, Gene–environment interaction, media_common, Mathematics, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Ecology, business.industry, Diameter at breast height, Forestry, 15. Life on land, Total heritable variance, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, business, 010606 plant biology & botany
Abstract

International audience; Key message: A novel multi-environment competition individual-tree mixed model resulted in better fit, and greater individual narrow- and broad-sense heritabilities than the model without competition, notably for traits showing competition. In multi-environment tests, the proposed model would allow tree breeders to select genotypes with the best performance in both additive direct and competition breeding values, increasing forest productivity. Context: Genetic merit of trees is known to be affected and interact with local competition effects as well as changes across environmental conditions. Recent studies showed that competition genetic effects can affect the genetic variance and bias the tree breeding values, and its covariance with direct breeding values has been variable across traits. Aims: The present paper extends a mixed-model methodology to the problem of accounting for competition in a multi-environment set of forest genetic trials and exploring its impact on genetic variances as well as the multi-environment genetic correlation. Methods: The proposed model is illustrated using data from two full-sib trials of Pinus elliottii var. elliottii × Pinus caribaea var. hondurensis F1. Dispersion parameters and (co)variance of total breeding values were estimated for diameter at breast height, total tree height, and stem straightness at age 10. Results: For traits showing competition effects (diameter at breast height and total tree height), the proposed multi-environment competition model gave better fit than the simpler model. Accounting for competition increased the direct additive variance, reduced the residual variances, and did not change significantly the across-site additive genetic correlation. However, for diameter at breast height, top 5% best genetic rankings showed differences. Conclusion: When traits are strongly affected by inter-tree competition, the use of the proposed model in multi-environment analyses can efficiently identify the phenomenon with general benefits in the fitting of genetic components and open the door to select on the basis of competitiveness.

Published
2021

2. Eucalyptus and Acacia tree growth over entire rotation in single- and mixed-species plantations across five sites in Brazil and Congo

Author

Maureen Voigtlaender, Florence Tardy, Louis Mareschal, Philippe Deleporte, Daniel Epron, Joseph Levillain, Jean-Paul Laclau, José Leonardo de Moraes Gonçalves, Yann Nouvellon, André Mabiala, José Luis Gava, Jean-Pierre Bouillet, Fernando Palha Leite, Rodrigo Hakamada, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Dept Ciencias Florestais, University of São Paulo (USP), Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP), Escola Superior de Agricultura 'Luiz de Queiroz' (ESALQ), Universidade de São Paulo (USP), Dept Forest Sci, ESALQ USP, International Paper do Brasil, Centre de Recherche sur la Durabilité et la Productivité des Plantations Industrielles (CRDPI), Laboratoire de Lyon [ANSES], Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES), Systèmes de Cultures Bananes, Ananas, et Plantains (Cirad-FLHOR-UPR 26 Systèmes bananes et ananas), Département Productions fruitières et horticoles (FLHOR), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Universidade Estadual Paulista Júlio de Mesquita Filho [São José do Rio Preto] (UNESP), and Laboratoire de Lyon

Subjects
0106 biological sciences, F08 - Systèmes et modes de culture, Humid subtropical climate, F62 - Physiologie végétale - Croissance et développement, Complementarity, Facteur climatique, 01 natural sciences, Nutrient, Acacia mangium, media_common, Biomass (ecology), Eucalyptus, biology, Wood production, Forestry, 04 agricultural and veterinary sciences, Plantation forestière, Facteur édaphique, Rendement des cultures, Facilitation, F40 - Écologie végétale, Interaction, media_common.quotation_subject, Acacia, Management, Monitoring, Policy and Law, Competition (biology), Culture en mélange, Botany, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Croissance, Nature and Landscape Conservation, Competition, Mixed-species plantations, 15. Life on land, biology.organism_classification, K10 - Production forestière, Agronomy, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Système de culture, 010606 plant biology & botany
Abstract

International audience; The association of N-2-fixing species (NFS) could be an attractive option for achieving a sustainable increase of Eucalyptus plantations (EP) productivity through a positive balance between facilitative effects and competition between species. A randomised block design was replicated at four sites (Cenibra, USP, Suzano and IP) in Southern Brazil and at one site in Congo. The development of mono-specific stands of Acacia mangium (100A) and Eucalyptus grandis or urophylla x grandis (100E), was compared with N fertilisation treatment (100E + N) and with mixed-species plantations in a 1:1 ratio (50A:50E), and in an additive series with varying densities of acacia for the same density of eucalypt (25A:100E, 50A:100E, 100A:100E). The objectives were to assess the effect of mixtures on tree growth and stand production, and the behaviour of the two species in contrasting soil and climatic conditions. Tree growth was monitored over stand rotation and the biomass of aboveground tree components estimated at mid-rotation and at harvesting age. Eucalyptus height was 13% higher in Brazil than in Congo. Favourable ecological conditions in Congo and Cenibra led to 50% higher Acacia tree height than at the other sites. A depressive effect of Eucalyptus neighbour trees on Acacia height and circumference growth, lower in Congo than in Brazil, was observed in the mixtures from age 1-2 years onwards. Depressive effects of acacia on eucalypt height and circumference growth were low in USP, Suzano and IP, high in Cenibra, and not observed in Congo, in 50A:50E and 25A:100E. A positive though insignificant response to N fertilisation was only found in USP and Congo. Complementarity for light and soil resource capture between Eucalyptus and Acacia trees resulted in mean annual increments in total stand stemwood biomass (MAI) that were 7-15%, 6-12%, and 40% higher in the additive series than for 100E in Cenibra, LISP and Congo, respectively at mid-rotation. Whilst lasting complementarity and facilitation in Congo led to 17-34% higher MAI in mixtures than for 100E at harvesting age, MAIs were not significantly higher in mixtures than for 100E in Brazil. Mixed-species plantations of Eucalyptus and A. mangium might enhance aboveground stand production on poor nutrient soils in warm and humid tropical climates with low water limitations

Published
2013

3. Evidence for carry-over effects of predator exposure on pathogen transmission potential

Author

Thierry Lefèvre, Koudraogo B. Yameogo, Kounbobr Roch Dabiré, Frédéric Simard, Olivier Roux, Abdoulaye Diabaté, Benjamin Roche, Amélie Vantaux, Institut de Recherche en Sciences de la Santé (IRSS), CNRST, Diversity, ecology, evolution & Adaptation of arthropod vectors (MIVEGEC-DEEVA), Evolution des Systèmes Vectoriels (ESV), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Unité de modélisation mathématique et informatique des systèmes complexes [Bondy] (UMMISCO), Institut de Recherche pour le Développement (IRD [France-Nord])-Institut de la francophonie pour l'informatique-Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD)-Université Gaston Bergé (Saint-Louis, Sénégal)-Université Cadi Ayyad [Marrakech] (UCA)-Université de Yaoundé I-Sorbonne Université (SU), Transmission-Interactions-Adaptations hôtes/vecteurs/pathogènes (MIVEGEC-TRIAD), O.R. received financial support through a post-doctoral fellowship from the IRD. Experimental infections were supported by the ANR grant no. 11-PDOC-006-01., and We thank the Associate Editor Dr Pejman Rohani and two anonymous reviewers for their valuable comments that greatly improved the manuscript. We thank Boubacar Nikiema for the RFLP-PCR, Jean Bazié and Raymond Hien for technical help with dissections and Andrea Yockey-Dejean for proofreading the paper.

Subjects
Male, life history, [SDV]Life Sciences [q-bio], Predation, Food chain, MESH: Malaria, Falciparum/transmission, MESH: Animals, Malaria, Falciparum, Life history, Predator, Pathogen, Research Articles, General Environmental Science, media_common, Ecology, Transmission potential, Longevity, General Medicine, Anopheles coluzzii, 3. Good health, carry-over effects, MESH: Larva/growth & development, [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology, MESH: Anopheles/physiology, MESH: Longevity, Larva, Female, General Agricultural and Biological Sciences, Food Chain, media_common.quotation_subject, Plasmodium falciparum, MESH: Insect Vectors, Biology, General Biochemistry, Genetics and Molecular Biology, Competition (biology), MESH: Predatory Behavior, Heteroptera, MESH: Plasmodium falciparum/growth & development, Anopheles, parasitic diseases, Animals, Humans, MESH: Food Chain, host-parasite and predator-prey, MESH: Humans, General Immunology and Microbiology, fungi, MESH: Anopheles/growth & development, MESH: Heteroptera/physiology, MESH: Fertility, interactions, host–parasite and predator–prey interactions, MESH: Male, Insect Vectors, non-consumptive effects, MESH: Larva/physiology, Fertility, Predatory Behavior, MESH: Female
Abstract

Accumulating evidence indicates that species interactions such as competition and predation can indirectly alter interactions with other community members, including parasites. For example, presence of predators can induce behavioural defences in the prey, resulting in a change in susceptibility to parasites. Such predator-induced phenotypic changes may be especially pervasive in prey with discrete larval and adult stages, for which exposure to predators during larval development can have strong carry-over effects on adult phenotypes. To the best of our knowledge, no study to date has examined possible carry-over effects of predator exposure on pathogen transmission. We addressed this question using a natural food web consisting of the human malaria parasite Plasmodium falciparum , the mosquito vector Anopheles coluzzii and a backswimmer, an aquatic predator of mosquito larvae. Although predator exposure did not significantly alter mosquito susceptibility to P. falciparum , it incurred strong fitness costs on other key mosquito life-history traits, including larval development, adult size, fecundity and longevity. Using an epidemiological model, we show that larval predator exposure should overall significantly decrease malaria transmission. These results highlight the importance of taking into account the effect of environmental stressors on disease ecology and epidemiology.

Published
2015