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Le Goff G, Damiens D, Ruttee AH, Jean F, Payet L, Lebon C, Taconet P, Gaudillat B, Habchi-Hanriot N, Dehecq JS, Simard F, Gouagna LC. Spatial and temporal characterization of Aedes albopictus oviposition activity in candidate urban settings for sterile insect technique testing in La Reunion Island. Infect Dis Poverty 2024; 13:78. [PMID: 39456106 PMCID: PMC11515404 DOI: 10.1186/s40249-024-01250-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2024] [Accepted: 10/09/2024] [Indexed: 10/28/2024] Open
Abstract
BACKGROUND Understanding of mosquito spatiotemporal dynamics is central to characterize candidate field sites for the sterile insect technique (SIT) testing, and is critical to the effective implementation and evaluation of pilot sterile male release programs. Here, we present a detailed description of Aedes albopictus (Skuse) egg-laying activity over a 6-year period in urban areas identified as potential SIT testing sites on Reunion Island. METHOD Weekly entomological collections using ovitraps were carried out in residential and adjacent uninhabited habitats in two urban areas, Duparc and Bois Rouge, in the municipality of Sainte Marie, Reunion Island. Time-series data incorporating the frequency of positive ovitraps and the total number of eggs/ovitrap recorded each time at each locality during the study period from May 2013 to December 2018 were analyzed with multifaceted statistical approaches including descriptive statistics and spatiotemporal analyses incorporating the role of climatic factors on overall ovitrap productivity. RESULTS During the ovitrap survey, the proportion of egg-positive ovitraps differed among study sites (χ2 = 50.21, df = 2, P < 0.001), being relatively lower in Duparc (89.5%) than in Bois-Rouges (95.3%) and the adjacent buffer zone (91.2%). Within each neighborhood, Ae. albopictus egg abundance varied by month in a roughly seasonal pattern marked by a single peak occurring more regularly February each year, a decline at the onset of the austral winter in July, followed by a period of lower ovitrap productivity in August and September. Fluctuation in both positivity rate and eggs densities per ovitraps were related to annual and seasonal variations in local temperature and rainfall (P < 0.001 in all cases). The spatial analysis also captured substantial between- and within-habitats heterogeneity, whereby the overall ovitrap productivity was higher in residential areas than in the buffer zone. CONCLUSIONS Collectively, these results reveal that the distribution of Ae. albopictus oviposition activity is shaped by local habitat heterogeneity and seasonal climatic factors. Overall, this study provides baseline insights into the reproductive dynamics of Ae. albopictus, which would assist in planning locally tailored SIT interventions, while addressing concerns related to focal areas of high egg-laying intensity and potential immigration of females from natural areas.
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Affiliation(s)
- Gilbert Le Goff
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France
| | - David Damiens
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France
| | - Abdoul-Hamid Ruttee
- Service de lutte anti vectorielle, Agence Régionale de Santé-Océan Indien (ARS-OI), Saint-Denis, Reunion Island, France
| | - Frédéric Jean
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France
| | - Laurent Payet
- Service de lutte anti vectorielle, Agence Régionale de Santé-Océan Indien (ARS-OI), Saint-Denis, Reunion Island, France
| | - Cyrille Lebon
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France
| | - Paul Taconet
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
| | - Benjamin Gaudillat
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France
| | - Nausicaa Habchi-Hanriot
- Service de lutte anti vectorielle, Agence Régionale de Santé-Océan Indien (ARS-OI), Saint-Denis, Reunion Island, France
| | - Jean-Sébastien Dehecq
- Service de lutte anti vectorielle, Agence Régionale de Santé-Océan Indien (ARS-OI), Saint-Denis, Reunion Island, France
| | - Frédéric Simard
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France
| | - Louis-Clément Gouagna
- Unité Mixte de Recherche "Maladies Infectieuses et Vecteurs: Écologie, Génétique, Évolution et Contrôle" (MIVEGEC): Université Montpellier, Institut de Recherche pour le Développement, Centre National de Recherche Scientifique, Délégation Régionale Occitanie, Montpellier, France.
- Institut de Recherche pour le Développement (IRD) La Réunion/Groupement d'Intérêt Public (GIP) Cyclotron Océan Indien, Recherche Santé Bio-Innovation, Sainte Clotilde, Reunion Island, France.
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DeSiervo MH, Ayres MP, Culler LE. Quantifying the nature and strength of intraspecific density dependence in Arctic mosquitoes. Oecologia 2021; 196:1061-1072. [PMID: 34338862 DOI: 10.1007/s00442-021-04998-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 07/21/2021] [Indexed: 11/29/2022]
Abstract
Processes that change with density are inherent in all populations, yet quantifying density dependence with empirical data remains a challenge. This is especially true for animals recruiting in patchy landscapes because heterogeneity in habitat quality in combination with habitat choice can obscure patterns expected from density dependence. Mosquitoes (Diptera: Culicidae) typically experience strong density dependence when larvae compete for food, however, effects vary across species and contexts. If populations experience intense intraspecific density-dependent mortality then overcompensation can occur, where the number of survivors declines at high densities producing complex endogenous dynamics. To seek generalizations about density dependence in a widespread species of Arctic mosquito, Aedes nigripes, we combined a laboratory experiment, field observations, and modeling approaches. We evaluated alternative formulations of discrete population models and compared best-performing models from our lab study to larval densities from ponds in western Greenland. Survivorship curves from the lab were the best fit by a Hassell model with compensating density dependence (equivalent to a Beverton-Holt model) where peak recruitment ranged from 8 to 80 mosquitoes per liter depending on resource supply. In contrast, our field data did not show a signal of strong density dependence, suggesting that other processes such as predation may lower realized densities in nature, and that expected patterns may be obscured because larval abundance covaries with resources (cryptic density dependence). Our study emphasizes the importance of covariation between the environment, habitat choice, and density dependence in understanding population dynamics across landscapes, and demonstrates the value of pairing lab and field studies.
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Affiliation(s)
- Melissa H DeSiervo
- Department of Biological Sciences, Dartmouth College, Hanover, NH, 03755, USA. .,Department of Botany, University of Wyoming, Laramie, WY, 82072, USA.
| | - Matthew P Ayres
- Department of Biological Sciences, Dartmouth College, Hanover, NH, 03755, USA.,The Dickey Center for International Understanding, Institute of Arctic Studies, Dartmouth College, Hanover, NH, 03755, USA
| | - Lauren E Culler
- Department of Environmental Studies, Dartmouth College, Hanover, NH, 03755, USA.,The Dickey Center for International Understanding, Institute of Arctic Studies, Dartmouth College, Hanover, NH, 03755, USA
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