Search bioRxivSearch

bioRxiv · 10.1101/2020.04.15.038729

Habitat selection by the Ringed Kingfisher (Megaceryle torquata stictipennis) in Basse-Terre, Guadeloupe: Possible negative association with chlordecone pollution

Abstract

In the Lesser Antilles the Ringed Kingfisher Megaceryle torquata stictipennis is found on Martinique, Dominica and Guadeloupe. On Martinique and Guadeloupe, farmers growing bananas have made massive use of chlordecone from 1973 until 1993. Chlordecone is a remnant organochlorine insecticide which bioaccumulates in organisms easily. We carried out a survey of the Ringed Kingfisher in 2009 on Basse-Terre, Guadeloupe, traveling 270 km on 44 rivers to assess the effects of chlordecone on its habitat selection behaviour. We recorded 47 encounters of Ringed Kingfishers over the survey. A habitat selection analysis revealed that the Ringed Kingfishers were located mainly in sections of rivers flowing through the ombrophilous forest, but absent on the ocean shoreline or in the lower parts of rivers. The Ringed Kingfishers distribution on Guadeloupe could be negatively associated with areas heavily polluted by the chlordecone. We propose that the widespread use of chlordecone in banana plantations on Guadeloupe between 1973 and 1993 has adverse ecological consequences, and may be responsible for the absence of Ringed Kingfishers in lowland habitat on the island. ResumeDans les Petites Antilles, le Martin-pecheur a ventre roux Megaceryle torquata stictipennis ne vit que sur trois iles: Martinique, Dominique et Guadeloupe. En 2009, nous avons effectue un recensement en Guadeloupe, sur 270 km parcourus dans 44 rivieres. Douze territoires de Martin-pecheur a ventre roux ont ete trouves, et la taille totale de la population est estimee a 54-64 individus. Une analyse de la selection de lhabitat montre que le Martin-pecheur a ventre roux se trouvait principalement sur les rivieres dans la foret ombrophile et non pas sur le bord de locean ni dans la partie basse des rivieres. En Guadeloupe, le Martin -pecheur a ventre roux est negativement associe avec les surfaces hautement polluees par un insecticide organochlore, la chlordecone. Nous suggerons que lepandage massif de la chlordecone de 1973 a 1993, dans les bananeraies de Guadeloupe, doit etre grandement responsable de labsence du Martin-pecheur a ventre roux dans les habitats de basses altitudes de lile. ResumenEn las Antillas Menores, el Martin Gijante Neotropical Megaceryle torquata stictipennis solo vive en tres islas: Martinica, Santo Domingo y Guadalupe. En 2001, realizamos un censo en Guadalupe sobre 270 km recorridos en 44 rios. Doce territorios de Martin Gijante Neotropical han sido registrados, y el volumen total de la poblacion se estima a 54-64 individuales. Un analisis de la seleccion del habitat muestra que el Martin Gijante Neotropical se encontraba principalmente en los rios en el bosque lluvioso y no a la orilla del mar tampoco en la parte baja de los rios. En Guadalupe, el Martin Gijante Neotropical esta negativamente asociado con las superficies muy poluadas por un insecticida organicloro, la chlordecona. Sugeremos que la difusion masiva de la chlordecona entre 1973 y 1993, en las plantaciones de platanos de Guadalupe, debe de ser altamente responsable de la aucencia del Martin Gijante Neotropical en los habitats de baja altitud en la isla.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Villard, P., Ferchal, A., Feldmann, P., Pavis, C., Bonenfant, C.. 2020-04-16. Habitat selection by the Ringed Kingfisher (Megaceryle torquata stictipennis) in Basse-Terre, Guadeloupe: Possible negative association with chlordecone pollution. https://doi.org/10.1101/2020.04.15.038729

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related preprints

Beyond Single-Metric Assessments: Uncovering Masked Butterfly Declines via Multi-Scalar Analysis in Central Alberta

1. This study analyzed 21 years (2000-2025) of butterfly count data from Central Alberta, integrated with intensive 5-year (2021-2025) high-resolution intra-seasonal sampling. 2. Long-term macro-scale analysis revealed a significant decline in Shannon Diversity, a change that remained obscured when relying solely on traditional metrics of species richness and evenness. 3. This diversity decline was primarily driven by the severe, long-term collapse of the native Common Ringlet (Coenonympha tullia). 4. Four other dominant species--Cabbage White (Pieris rapae), Clouded Sulphur (Colias eriphyle), European Skipper (Thymelicus lineola), and Common Wood Nymph (Cercyonis pegala)--maintained long-term population stability, though their abundances were significantly constrained by extreme winter minimum temperatures and rapid spring warming. 5. High-resolution intra-seasonal analysis (2021-2025) demonstrated that community indices and species-specific abundances were strongly limited by daily weather, particularly wind velocity and temperature. 6. These findings illustrate that while traditional metrics like richness and evenness are fundamental to community ecology, they provide incomplete insights when applied in isolation; they are most effective when utilized as part of a complementary, multi-scalar framework. 7. This study highlights the necessity of coupling multi-decadal historical datasets with high-frequency, fine-scale sampling to accurately identify the mechanisms of community turnover that simpler metrics may overlook. 8. The results underscore the critical importance of standardized citizen science monitoring in quantifying environmental impacts and establishing conservation priorities for terrestrial insect groups.

ecology

From concentration to export: resource contrasts and bee traits shape pollinator spillover to crops

Floral plantings can either concentrate bees or export them to adjacent crops, yet the ecological conditions influencing these outcomes remain unclear. Here, we develop a mathematical model as proof of concept for our previous integrative hypothesis: concentrator and exporter outcomes can arise as alternative, context-dependent outcomes of the same underlying resource-selection process. Using bees as a model and focusing specifically on spillover from floral plantings to crops, we identified resource-specific thresholds separating concentration- and export-favoring conditions. Our model translates differences in relative patch attractiveness into context-dependent concentration and export outcomes and generates resource-specific, testable predictions about the conditions favoring pollinator movement into crops. In our simulations, the concentrator-exporter transition occurred at a lower flowering-intensity contrast than at pollen or nectar contrasts, which suggests that flowering intensity may provide an initial cue for bee movement, whereas nectar and pollen rewards refine or sustain bee responses once crops are perceived as attractive. Spillover thresholds differed among resource contrasts, whereas response steepness varied across bee-trait and community scenarios. Under the model's trait-sensitivity formulation, predicted spillover probability responded more strongly to flowering contrast for specialists than for generalists; colony size amplified this response, whereas bee richness dampened it. Together, these patterns show how flowering and resource contrasts interact with bee traits and community context to shape predicted spillover. Our results confirm that the concentrator and exporter hypotheses can be understood as context-dependent outcomes of the same ecological process rather than as mutually exclusive alternatives. Experimental tests of the predicted thresholds conducted in the field could reveal when and where floral plantings are most likely to promote bee spillover to crops, potentially supporting crop pollination.

ecology

A Computational Re-evaluation of Spatial Trials for Zoonotic Tuberculosis Control: Model Misspecification, Diagnostic Miss-classification, and the Illusion of Wildlife Culling Efficacy

1. Wildlife reservoir management frequently relies on the Randomised Badger Culling Trial's (RBCT) trade-off hypothesis, which posits that reductions in cattle herd infections are offset by a perturbation effect driven by disrupted host dispersal. This paper evaluates the computational and epidemiological robustness of this historical trial, which serves as the foundational empirical experiment guiding zoonotic tuberculosis (Mycobacterium bovis) control policies. 2. Using generalized linear mixed models with a generalized Poisson error distribution to explicitly address historical data overdispersion, this study contrasts traditional parametric inference against exact cluster-constrained permutation tests across distinct operational definitions of disease incidence. 3. Non-parametric diagnostics reveal that previously reported treatment and perturbation effects render as statistical artifacts under exact non-parametric permutation. Inside culling zones, parametric significance fails to withstand exact permutation verification due to extreme data leverage in localized cluster blocks. 4. Crucially, when diagnostic misclassification biases are eliminated by analysing total reactor datasets, all apparent culling effects disappear, and information criteria overwhelmingly favour nested null architectures. Unconfirmed reactors likely represent true biological infections missed by low-sensitivity post-mortem macro-necropsy, proving that host removal tracks observation noise rather than genuine zoonotic transmission pathways. 5. Finally, empirical scaling conducted in this study identifies a novel mathematical saturation effect, demonstrating that this sub-linear scaling is an operational artifact of unmodelled herd-level disease recurrence over time. 6. Policy implications. Because current zoonotic tuberculosis intervention frameworks are built upon a structurally misspecified statistical model, they have driven large-scale veterinary policies resulting in substantial, unevidenced ecological and economic interventions while failing to provide genuine public health, animal health, or disease control benefits.

ecology