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Kim D, Burkett-Cadena ND, Reeves LE. Changes in mosquito species and blood meal composition associated with adulticide applications. Sci Rep 2023; 13:22087. [PMID: 38086895 PMCID: PMC10716403 DOI: 10.1038/s41598-023-49494-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 12/08/2023] [Indexed: 12/18/2023] Open
Abstract
Although adulticide application is a pillar in the integrated management of nuisance and vector mosquitoes, non-target effects of adulticide applications within ecosystems are a substantial concern. However, the impacts of adulticide applications on non-target organisms are not necessarily detrimental, and in some cases, may provide benefits to certain organisms or wildlife. Here, we hypothesized that adulticide applications have beneficial non-target impacts on vertebrate wildlife through reduced biting pressure. To test this, we collected mosquitoes from ultra-low volume Permanone-treated (intervention) and untreated (reference) areas and assessed mosquito abundance and diversity, and abundance of blood-engorged female mosquitoes. We performed DNA barcoding analysis on mosquito blood meals to identify host species. Our results demonstrated a significant reduction in mosquito abundance by 58.9% in the intervention areas, taking into account the reduction in reference areas. Consequently, this decline led to a 64.5% reduction in the abundance of blood-engorged females. We also found a temporal dynamic of mosquito composition driven by mosquito control actions in which different mosquito species became dominant at treated sites while composition at reference areas remained similar during the same period. The present study suggests that the beneficial effects of mosquito control treatments for humans extend to other vertebrates, which represents an unstudied and rarely recognized non-target impact.
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Affiliation(s)
- Dongmin Kim
- Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, USA.
| | | | - Lawrence E Reeves
- Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, USA.
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Sinclair BJ. An annotated checklist of the Diptera of the Galápagos Archipelago (Ecuador). Zootaxa 2023; 5283:1-102. [PMID: 37518751 DOI: 10.11646/zootaxa.5283.1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Indexed: 08/01/2023]
Abstract
The Diptera fauna of the Galápagos Archipelago is updated and an annotated checklist is presented. Currently 50 families, 207 genera, and a minimum of 324 species are recorded from the islands. Approximately 107 species are considered to have arrived on the Galápagos Islands through human introductions, an estimated 101 species are considered endemic, 42 species have naturally colonized the islands from mainland Americas, 21 species are either introduced or arrived naturally and 53 species remain unidentified. The following new combination is proposed: Chrysanthrax primitivus (Walker) is moved to Hemipenthes Loew as H. primitivus (Walker) comb. nov. All references to the Galápagos taxonomic literature are included, known island species distributions listed and general remarks on the biology of many species are provided.
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Affiliation(s)
- Bradley J Sinclair
- Canadian Food Inspection Agency; K.W. Neatby Bldg.; C.E.F.; 960 Carling Ave.; Ottawa; ON; Canada K1A 0C6; Canadian National Collection of Insects; Arachnids and Nematodes; Agriculture and Agri-Food Canada; K.W. Neatby Bldg.; C.E.F.; 960 Carling Ave.; Ottawa; ON; Canada K1A 0C6.
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Culda CA, Dionnet R, Barbu AC, Cârstolovean AS, Dan T, Grijalva J, Espin P, Vinueza RL, Cruz M, Páez-Rosas D, Renato L, Mihalca AD. The Presence of Dirofilaria immitis in Domestic Dogs on San Cristobal Island, Galapagos. Pathogens 2022; 11:1287. [PMID: 36365038 PMCID: PMC9696258 DOI: 10.3390/pathogens11111287] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/31/2022] [Accepted: 10/31/2022] [Indexed: 07/30/2023] Open
Abstract
This study's concept was outlined around the principle of conservation medicine in a biodiversity hotspot from the Neotropical realm: the Galapagos Islands. The wildlife balance has been modified by multi-host parasites introduced with some domestic animals (dogs and cats). The endemic and endangered species, the Galapagos sea lion (GSL, Zalophus wollebaeki), has been exposed to pathogens of canine and feline origin that could become a significant conservation problem for this species. One of these potential cases is the filarial heartworm infection, Dirofilaria immitis, which has been reported on other pinnipeds, with fatalities and clinical symptoms. Therefore, this study evaluated the presence of the microfilaria of D. immitis in dogs from Puerto Baquerizo Moreno, San Cristobal Island, where the largest rookery of GSLs lives and where the proximity to domestic dogs is the most intimate compared to other rookeries of the archipelago. Between July and September 2021, 587 blood samples were collected from owned dogs of Puerto Baquerizo Moreno. Overall, 10 dogs (1.7%) were positive for the presence of the microfilaria of D. immitis with a confidence interval of 0.7%-2.8%. No other filarial species were identified. Significant differences in prevalence between different dog categories were observed only for the age (p = 0.001). This study represents the first report of D. immitis, the agent of canine heartworm disease, in dogs from San Cristobal Island. Hence, the presence of the microfilaria of D. immitis in the blood of dogs could increase the risk of infection to which the GSL is exposed in the region.
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Affiliation(s)
- Carla Andreea Culda
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Romane Dionnet
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Andra Celia Barbu
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Andrada Silvia Cârstolovean
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Teodora Dan
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Jaime Grijalva
- Escuela de Medicina Veterinaria, Universidad San Francisco de Quito, Cumbayá, Quito 150157, Ecuador
| | - Priscilla Espin
- Agencia de Regulación y Control de la Bioseguridad y Cuarentena para Galápagos, Isla San Cristóbal 200152, Galápagos, Ecuador
| | - Rommel Lenin Vinueza
- Escuela de Medicina Veterinaria, Universidad San Francisco de Quito, Cumbayá, Quito 150157, Ecuador
- Laboratorio de Entomología Médica & Medicina Tropical LEMMT, Universidad San Francisco de Quito, Cumbayá, Quito 150157, Ecuador
| | - Marylin Cruz
- Agencia de Regulación y Control de la Bioseguridad y Cuarentena para Galápagos, Isla San Cristóbal 200152, Galápagos, Ecuador
| | - Diego Páez-Rosas
- Galapagos Science Center, Universidad San Francisco de Quito, Isla San Cristóbal 200150, Islas Galápagos, Ecuador
- Dirección del Parque Nacional Galápagos, Unidad Técnica Operativa San Cristóbal, Isla San Cristóbal 200150, Islas Galápagos, Ecuador
| | - Leon Renato
- Laboratorio de Entomología Médica & Medicina Tropical LEMMT, Universidad San Francisco de Quito, Cumbayá, Quito 150157, Ecuador
| | - Andrei Daniel Mihalca
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania
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P. MNP, D. RP, G. S, K. AAP, K. SM, A. SP, P. R, V. S, Dasgupta S, Krishnan J, Ishtiaq F. Island biogeography and human practices drive ecological connectivity in mosquito species richness in the Lakshadweep Archipelago. Sci Rep 2022; 12:8060. [PMID: 35577864 PMCID: PMC9110355 DOI: 10.1038/s41598-022-11898-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 04/26/2022] [Indexed: 11/11/2022] Open
Abstract
Mosquitoes are globally distributed and adapted to a broad range of environmental conditions. As obligatory hosts of many infectious pathogens, mosquito abundance and distribution are primarily determined by the presence and quality of larval habitats. To understand the dynamics and productivity of larval habitats in changing island environments, we conducted a four-month mosquito survey across ten inhabited islands in the Lakshadweep archipelago. Using fine-resolution larval habitat mapping, we recorded 7890 mosquitoes representing 13 species and 7 genera. Of these, four species comprised 95% of the total collections—Aedes albopictus (Stegomyia) was the dominant species followed by Armigeres subalbatus, Culex quinquefasciatus and Malaya genurostris. We found larval species richness was positively associated with the island area and mosquito larval richness (Chao1 estimator) was higher in artificial habitats than in natural habitats. Furthermore, mosquito species composition did not deteriorate with distance between islands. Mosquito abundance by species was associated with microclimatic variables—pH and temperature. We detected co-existence of multiple species at a micro-habitat level with no evidence of interactions like competition or predation. Our study analyzed and identified the most productive larval habitats –discarded plastic container and plastic drums contributing to high larval indices predicting dengue epidemic across the Lakshadweep islands. Our data highlight the need to devise vector control strategies by removal of human-induced plastic pollution (household waste) which is a critical driver of disease risk.
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Blood feeding habits of mosquitoes: hardly a bite in South America. Parasitol Res 2022; 121:1829-1852. [PMID: 35562516 PMCID: PMC9106385 DOI: 10.1007/s00436-022-07537-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 04/28/2022] [Indexed: 11/17/2022]
Abstract
Mosquito blood feeding plays a key role in epidemiology. Despite its importance and large number of studies worldwide, less attention has been paid in South America. We summarized some general concepts and methodological issues related to the study of mosquito blood feeding habits, and compiled and analyzed all published information regarding the subject in the continent until 2020. Available literature comprised 152 scientific studies, that pursued different approaches: human landing catches (102 studies), baited trap (19), and blood meal analyses of collected specimens (38). Among the latter, 23 used serological and 15 molecular techniques. Species most frequently studied were those incriminated in malaria transmission, whereas relevant vectors such as Aedes aegypti, Ae. albopictus, and Haemagogus janthinomys were surprisingly neglected. Brazil was the leading country both in number of works and species studied. For over 70% of the species and three out of 13 South American countries there is no single information on mosquito blood feeding habits. Data from baited traps included 143 mosquito species, 83.9% of which were attracted to humans, either exclusively (10.5%) or in combination with other vertebrates (73.4%). Host blood identification of field collected specimens provided data on 102 mosquito species, and 60.8% of these fed on humans (55.9% combined with other vertebrates). Only 17 of the 73 species assessed by both methods yielded similar feeding patterns. Finally, supplementary tables are provided in a comprehensive summary of all information available and information gaps are highlighted for future research in the continent.
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Ishtiaq F. Ecology and Evolution of Avian Malaria: Implications of Land Use Changes and Climate Change on Disease Dynamics. J Indian Inst Sci 2021. [DOI: 10.1007/s41745-021-00235-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Toulkeridis T, Tamayo E, Simón-Baile D, Merizalde-Mora MJ, Reyes –Yunga DF, Viera-Torres M, Heredia M. Climate Change according to Ecuadorian academics–Perceptions versus facts. ACTA ACUST UNITED AC 2020. [DOI: 10.17163/lgr.n31.2020.02] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Climate change has become one of the most important topics in each country’s government agendas. The current effects demand quicker actions in order to decrease the speed at which the global warming and climate is changing, which are commonly seen in global agreements to reduce pollution. However, the main changes to face and mitigate such phenomena depends on each country´s decision and not on global agreements as the causes are continent-wide although the effects and magnitudes may be local. One of the key components for an effective adaption and mitigation is the role that the population have over national decisions. For this reason, the level of awareness and knowledge about what is occurring in their surroundings vital, thus the importance of a correct information broadcast and education. For the aforementioned reasons, the current study compares the recent perception of a well-educated Ecuadorean community regarding the climate change worldwide and in Ecuador with the scientific evidence and historical facts, and how it affects its vulnerability to the climate change effects.
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Jimenez IA, Vega Mariño PA, Stapleton GS, Prieto JB, Bowman DD. Canine vector-borne disease in domestic dogs on Isla Santa Cruz, Galápagos. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2020; 19:100373. [PMID: 32057400 DOI: 10.1016/j.vprsr.2020.100373] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 01/13/2020] [Accepted: 01/16/2020] [Indexed: 11/19/2022]
Abstract
Vector-borne diseases result in significant morbidity and mortality in domestic dogs in tropical and subtropical regions and also pose a potential threat to wildlife species and humans. Ehrlichia canis, the causative agent of canine monocytic ehrlichiosis (CME), has a high reported seroprevalence in dogs on Santa Cruz in the Galápagos Islands, Ecuador. Veterinary diagnostic and treatment resources are often scarce and clinical follow-up is lacking in the Galápagos. This study evaluated 58 dogs presenting to the Darwin Animal Doctors clinic in the city of Puerto Ayora on Santa Cruz Island during August of 2018. The seroprevalence of E. canis/Ehrlichia ewingii (48.3%), Anaplasma phagocytophilum/Anaplasma platys (12.1%), and Borrelia burgdorferi (0%), as well as the proportion of dogs actively infected with E. canis (12.1%) and E. ewingii (0%), are reported. Active infection was defined as the identification of antigen by PCR. Dogs with a packed cell volume (PCV) ≤ 30% had a 10-fold risk of active infection with E. canis compared to dogs with a PCV ≥ 31% (p = .0124). A PCV cutoff of 30% may be a useful screening tool for active E. canis infection in regions with high Ehrlichia seroprevalence, in the absence of other apparent causes of anemia. Dirofilaria immitis antigen was present in 6.9% of examined dogs, with the highest prevalence in the barrio Las Ninfas. PCR and Sanger sequencing were used to provide the first molecular identification of D. immitis in the Galápagos. This study updates the seropositivity and prevalence data of these canine vector-borne pathogens and highlights the need for continued surveillance in the region.
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Affiliation(s)
- Isabel Angelica Jimenez
- Cornell University, College of Veterinary Medicine, 602 Tower Road, Ithaca, NY 14850, United States of America; Animal Medical Center, 510 E. 62nd Street, New York, NY 10065, United States of America.
| | - Patricio Alejandro Vega Mariño
- Agencia de Regulación y Control de la Bioseguridad y Cuarentena para Galápagos, Avenida Baltra, Puerto Ayora, Santa Cruz, Galápagos 200102, Ecuador
| | - G Sean Stapleton
- Cornell University, College of Veterinary Medicine, 602 Tower Road, Ithaca, NY 14850, United States of America
| | - Jennifer Battista Prieto
- Cornell University, College of Veterinary Medicine, 602 Tower Road, Ithaca, NY 14850, United States of America
| | - Dwight Douglas Bowman
- Cornell University, College of Veterinary Medicine, 602 Tower Road, Ithaca, NY 14850, United States of America
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Asigau S, Salah S, Parker PG. Assessing the blood meal hosts of Culex quinquefasciatus and Aedes taeniorhynchus in Isla Santa Cruz, Galápagos. Parasit Vectors 2019; 12:584. [PMID: 31842984 PMCID: PMC6915994 DOI: 10.1186/s13071-019-3835-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 12/03/2019] [Indexed: 11/24/2022] Open
Abstract
Background Blood meal host selection by mosquito vectors is an important component in understanding disease dynamics of pathogens that threaten endemic fauna in isolated islands such as Galápagos. Research on the feeding behavior of mosquitoes can provide clues to the hosts and vectors involved in disease transmission. This information is particularly critical for endemic wildlife fauna in island systems that have evolved without resistance to novel diseases such as avian malaria. The aims of this study were to determine the blood-feeding patterns of two species of mosquitoes found in Galápagos and discuss how their feeding behavior may influence the transmission of pathogens such as avian malaria. Methods In the summer of 2015, we sampled two mosquito species (Aedes taeniorhynchus and Culex quinquefasciatus) across 18 different sites on Isla Santa Cruz, which is the second largest island in Galápagos and has the largest human population. We trapped mosquitoes using CDC light traps and CDC gravid traps and identified sources of blood meals for engorged mosquitoes by sequencing a portion of the vertebrate mitochondrial cytochrome b gene. Results Out of 947 female mosquitoes captured, 320 were blood-fed, and PCR amplifications were successful for 301 of the blood meals. Results revealed that both Aedes taeniorhynchus and Culex quinquefasciatus feed from a variety of vertebrate taxa, numerically dominated by humans on Isla Santa Cruz. Conclusions The high proportion of mammalian blood meals could represent locally available and abundant hosts on Santa Cruz. However, host surveys and estimates of relative abundances of vertebrate species will need to accompany mosquito trapping studies on non-inhabited and inhabited islands in Galápagos to further validate this.
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Affiliation(s)
- Samoa Asigau
- Department of Biology, University of Missouri, St. Louis, One University Blvd., St. Louis, MO, 63121, USA. .,Whitney R. Harris World Ecology Center, University of Missouri, One University Blvd., St. Louis, MO, 63121, USA.
| | - Sawsan Salah
- Department of Biology, University of Missouri, St. Louis, One University Blvd., St. Louis, MO, 63121, USA.,Whitney R. Harris World Ecology Center, University of Missouri, One University Blvd., St. Louis, MO, 63121, USA
| | - Patricia G Parker
- Department of Biology, University of Missouri, St. Louis, One University Blvd., St. Louis, MO, 63121, USA.,Whitney R. Harris World Ecology Center, University of Missouri, One University Blvd., St. Louis, MO, 63121, USA.,WildCare Institute, Saint Louis Zoo, One Government Drive, St. Louis, MO, 63110, USA
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Francisco Campos-Rivadeneira and Roberto Levi- Castillo: Their lives and contributions to the study of mosquitoes (Diptera: Culicidae) in Ecuador. ACTA ACUST UNITED AC 2019; 39:172-198. [PMID: 31529859 DOI: 10.7705/biomedica.v39i3.4415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Indexed: 11/21/2022]
Abstract
The study of mosquitoes is important in the prevention of vector-borne diseases. In Ecuador, the study of local mosquito biodiversity was pioneered by two entomologists whose contributions span through the first half of the 20th century, Francisco Campos-Rivadeneira and Roberto Levi-Castillo. Both of them contributed to general aspects of Entomology and to particular insights in mosquito taxonomy. Their publications and discoveries were recognized by the international scientific community but went unnoticed in South America during their time. Today, very few citizens remember the names and contributions of these two scientists. Here, we provide an overview of their lives, a summary of their contributions, and we conclude with a broader outlook on the practice of science in Latin America during their time.
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Eastwood G, Cunningham AA, Kramer LD, Goodman SJ. The vector ecology of introduced Culex quinquefasciatus populations, and implications for future risk of West Nile virus emergence in the Galápagos archipelago. MEDICAL AND VETERINARY ENTOMOLOGY 2019; 33:44-55. [PMID: 30168152 PMCID: PMC7379259 DOI: 10.1111/mve.12329] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 05/15/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
Culex quinquefasciatus Say (Diptera: Culicidae), an important vector of West Nile virus (WNV) in the U.S.A., was first detected on the Galápagos Islands (Ecuador) in the 1980s. However, little is known of its ecology, distribution or capacity for arbovirus transmission in the Galápagos. We characterize details of lifecycle (including gonotrophic period), temporal abundance, spatial distribution, vector competence and host-feeding behaviour. Culex quinquefasciatus was detected on five islands of the Galápagos during 2006-2011. A period of 7-14 days was required for egg-adult emergence; water salinity above 5 ppt was demonstrated to hinder larval development. Blood-meal analysis indicated feeding on reptiles, birds and mammals. Assessment of WNV vector competency of Galápagos C. quinquefasciatus showed a median infectious dose of 7.41 log10 plaque-forming units per millilitre and evidence of vertical transmission (minimal filial infection rate of 3.7 per 1000 progeny). The distribution of C. quinquefasciatus across the archipelago could be limited by salt intolerance, and its abundance constrained by high temperatures. Feeding behaviour indicates potential to act as a bridge vector for transmission of pathogens across multiple taxa. Vertical transmission is a potential persistence mechanism for WNV on Galápagos. Together, our results can be used for epidemiological assessments of WNV and target vector control, should this pathogen reach the Galápagos Islands.
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Affiliation(s)
- G. Eastwood
- School of BiologyUniversity of LeedsLeedsU.K.
- Wildlife Epidemiology, Institute of ZoologyZoological Society of LondonLondonU.K.
- Galápagos GeneticsEpidemiology and Pathology LaboratorySanta CruzEcuador
- New York State Department of HealthWadsworth CenterNew YorkNYU.S.A.
| | - A. A. Cunningham
- Wildlife Epidemiology, Institute of ZoologyZoological Society of LondonLondonU.K.
- Galápagos GeneticsEpidemiology and Pathology LaboratorySanta CruzEcuador
| | - L. D. Kramer
- New York State Department of HealthWadsworth CenterNew YorkNYU.S.A.
| | - S. J. Goodman
- School of BiologyUniversity of LeedsLeedsU.K.
- Galápagos GeneticsEpidemiology and Pathology LaboratorySanta CruzEcuador
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Socio-Ecological Factors Associated with Dengue Risk and Aedes aegypti Presence in the Galápagos Islands, Ecuador. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16050682. [PMID: 30813558 PMCID: PMC6427784 DOI: 10.3390/ijerph16050682] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 02/16/2019] [Accepted: 02/19/2019] [Indexed: 01/21/2023]
Abstract
Dengue fever is an emerging infectious disease in the Galápagos Islands of Ecuador, with the first cases reported in 2002 and subsequent periodic outbreaks. We report results of a 2014 pilot study conducted in Puerto Ayora (PA) on Santa Cruz Island, and Puerto Baquerizo Moreno (PB) on San Cristobal Island. To assess the socio-ecological risk factors associated with dengue and mosquito vector presence at the household level, we conducted 100 household surveys (50 on each island) in neighborhoods with prior reported dengue cases. Adult mosquitoes were collected inside and outside the home, larval indices were determined through container surveys, and heads of households were interviewed to determine demographics, self-reported prior dengue infections, housing conditions, and knowledge, attitudes, and practices regarding dengue. Multi-model selection methods were used to derive best-fit generalized linear regression models of prior dengue infection, and Aedes aegypti presence. We found that 24% of PB and 14% of PA respondents self-reported a prior dengue infection, and more PB homes than PA homes had Ae. aegypti. The top-ranked model for prior dengue infection included several factors related to human movement, household demographics, access to water quality issues, and dengue awareness. The top-ranked model for Ae. aegypti presence included housing conditions, mosquito control practices, and dengue risk perception. This is the first study of dengue risk and Ae. aegypti presence in the Galápagos Islands.
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Pereira Dos Santos T, Roiz D, Santos de Abreu FV, Luz SLB, Santalucia M, Jiolle D, Santos Neves MSA, Simard F, Lourenço-de-Oliveira R, Paupy C. Potential of Aedes albopictus as a bridge vector for enzootic pathogens at the urban-forest interface in Brazil. Emerg Microbes Infect 2018; 7:191. [PMID: 30482898 PMCID: PMC6258732 DOI: 10.1038/s41426-018-0194-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 10/31/2018] [Accepted: 11/05/2018] [Indexed: 11/16/2022]
Abstract
The invasive species Aedes albopictus is present in 60% of Brazilian municipalities, including at the interfaces between urban settings and forests that are zoonotic arbovirus hotspots. We investigated Ae. albopictus colonization, adult dispersal and host feeding patterns in the anthropic-natural interface of three forested sites covering three biomes in Brazil in 2016. To evaluate whether an ecological overlap exists between Ae. albopictus and sylvatic yellow fever virus (YFV) in forests, we performed similar investigations in seven additional urban-forest interfaces where YFV circulated in 2017. We found Ae. albopictus in all forested sites. We detected eggs and adults up to 300 and 500 m into the forest, respectively, demonstrating that Ae. albopictus forest colonization and dispersal decrease with distance from the forest edge. Analysis of the host identity in blood-engorged females indicated that they fed mainly on humans and domestic mammals, suggesting rare contact with wildlife at the forest edge. Our results show that Ae. albopictus frequency declines as it penetrates into the forest and highlight its potential role as a bridge vector of zoonotic diseases at the edge of the Brazilian forests studied.
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Affiliation(s)
| | - David Roiz
- MIVEGEC Laboratory, IRD-CNRS-Montpellier Univ., Montpellier, 34394, France
| | | | | | - Marcelo Santalucia
- State of Goias Public Health Laboratory Dr. Giovanni Cysneiros, Goiania, GO, 74853-120, Brazil
| | - Davy Jiolle
- MIVEGEC Laboratory, IRD-CNRS-Montpellier Univ., Montpellier, 34394, France
| | | | - Frédéric Simard
- MIVEGEC Laboratory, IRD-CNRS-Montpellier Univ., Montpellier, 34394, France
| | | | - Christophe Paupy
- MIVEGEC Laboratory, IRD-CNRS-Montpellier Univ., Montpellier, 34394, France.
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Perlut NG, Parker PG, Renfrew RB, Jaramillo M. Haemosporidian parasite community in migrating bobolinks on the Galapagos Islands. Int J Parasitol Parasites Wildl 2018; 7:204-206. [PMID: 29988782 PMCID: PMC6032038 DOI: 10.1016/j.ijppaw.2018.05.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 05/24/2018] [Accepted: 05/30/2018] [Indexed: 02/06/2023]
Abstract
Bobolinks (Dolichonyx oryzivorus) migrate from their breeding grounds in North America to their wintering grounds in South America during the fall each year. A small number of Bobolinks stop temporarily in Galapagos, and potentially carry parasites. On the North American breeding grounds, Bobolinks carry a least two of the four Plasmodium lineages recently detected in resident Galapagos birds. We hypothesized that Bobolinks carried these parasites to Galapagos, where they were bitten by mosquitoes that then transmitted the parasites to resident birds. The haemosporidian parasite community in 44% of the Bobolinks we captured was consistent with those on their breeding grounds. However, the lineages were not those found in Galapagos birds. Our results provide a parasite community key for future monitoring.
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Affiliation(s)
- Noah G. Perlut
- Department of Environmental Studies, University of New England, 11 Hills Beach Road, Biddeford, ME 04005, United States
| | - Patricia G. Parker
- Department of Biology, University of Missouri – St. Louis, One University Blvd., St. Louis, MO 63121, United States
- Whitney R. Harris World Ecology Center, University of Missouri – St. Louis, One University Blvd., St. Louis, Missouri 63121, United States
- Saint Louis Zoo, WildCare Institute, One Government Dr., St. Louis, MO 63110, United States
| | | | - Maricruz Jaramillo
- Department of Biology, University of Missouri – St. Louis, One University Blvd., St. Louis, MO 63121, United States
- Whitney R. Harris World Ecology Center, University of Missouri – St. Louis, One University Blvd., St. Louis, Missouri 63121, United States
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15
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Asigau S, Parker PG. The influence of ecological factors on mosquito abundance and occurrence in Galápagos. JOURNAL OF VECTOR ECOLOGY : JOURNAL OF THE SOCIETY FOR VECTOR ECOLOGY 2018; 43:125-137. [PMID: 29757523 DOI: 10.1111/jvec.12292] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 02/07/2018] [Indexed: 05/15/2023]
Abstract
We sampled mosquitoes across 18 sites established at different elevations and stretching from the north to the south of Isla Santa Cruz, Galápagos. Two commonly occurring species, Ae. taeniorhynchus and Cx. quinquefasciatus, were collected along with environmental variables characteristic of the trapping sites to assess their influence on mosquito abundance and occurrence in the dry season of 2015. We captured Ae. taeniorhynchus at 14 out of 18 sites and Cx. quinquefasciatus at low and high elevation sites on Santa Cruz. We utilized two generalized linear models; the first assessed the influence of environmental variables on abundances of Ae. taeniorhynchus and the second assessed the influence of these variables on the presence of Cx. quinquefasciatus. Populations of both mosquito species declined with elevation. Rainfall data were limited, as we sampled during the dry season of 2015. Distance to mangroves and maximum humidity were significant in influencing the abundance of Ae. taeniorhynchus, while maximum humidity was found to significantly influence the presence of Cx. quinquefasciatus. Both species occurred in sites where temperature, precipitation, and humidity should allow for mosquito development as well as parasitic development of the protozoan parasites that cause avian malaria. Further research involving year-round sampling of mosquitoes and accompanying meteorological data as well as experimental studies on vector competence are required to understand disease dynamics of parasites such as avian malaria in Galápagos.
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Affiliation(s)
- Samoa Asigau
- University of Missouri Saint Louis, Department of Biology, St. Louis, MO, 63121, U.S.A
- Whitney R. Harris World Ecology Center, University of Missouri Saint Louis, St. Louis, MO, 63121, U.S.A
| | - Patricia G Parker
- University of Missouri Saint Louis, Department of Biology, St. Louis, MO, 63121, U.S.A
- WildCare Institute, St. Louis Zoo, St. Louis, MO, 63110, U.S.A
- Whitney R. Harris World Ecology Center, University of Missouri Saint Louis, St. Louis, MO, 63121, U.S.A
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16
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Abstract
Colonization comprises the physical arrival of a species in a new area, but also its successful establishment within the local community. Oceanic islands, like the Hawaiian and the Galapagos archipelagos, represent excellent systems to study the mechanisms of colonization because of their historical isolation. In this chapter, we first review some of the major mechanisms by which parasites and vectors could arrive to an oceanic island, both naturally or due to human activities, and the factors that may influence their successful establishment in the insular host community. We then explore examples of natural and anthropogenic colonization of the Galapagos Islands by parasites and vectors, focusing on one or more case studies that best represent the diversity of colonization mechanisms that has shaped parasite distribution in the archipelago. Finally, we discuss future directions for research on parasite and vector colonization in Galapagos Islands.
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Affiliation(s)
- Patricia G. Parker
- Department of Biology, University of Missouri – St. Louis, St. Louis, Missouri USA
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17
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Asigau S, Hartman DA, Higashiguchi JM, Parker PG. The distribution of mosquitoes across an altitudinal gradient in the Galapagos Islands. JOURNAL OF VECTOR ECOLOGY : JOURNAL OF THE SOCIETY FOR VECTOR ECOLOGY 2017; 42:243-253. [PMID: 29125252 DOI: 10.1111/jvec.12264] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
An avian malaria parasite (genus Plasmodium) has been detected consistently in the Galapagos Penguin (Spheniscus mendiculus) and less frequently in some passerines. We sampled three resident mosquito species (Aedes taeniorhynchus, Culex quinquefasciatus, and Aedes aegypti) using CDC light and gravid traps on three islands in 2012, 2013, and 2014. We sampled along altitudinal gradients to ask whether there are mosquito-free refugia at higher elevations as there are in Hawaii. We captured both Ae. taeniorhynchus and Cx. quinquefasciatus at all sites. However, abundances differed across islands and years and declined significantly with elevation. Aedes aegypti were scarce and limited to areas of human inhabitation. These results were corroborated by two negative binomial regression models which found altitude, year, trap type, and island as categorized by human inhabitation to be significant factors influencing the distributions of both Ae. taeniorhynchus and Cx. quinquefasciatus. Annual differences at the highest altitudes in Isabela and Santa Cruz indicate the lack of a stable highland refuge if either species is found to be a major vector of a parasite, such as avian malaria in Galapagos. Further work is needed to confirm the vector potential of both species to understand the disease dynamics of avian malaria in Galapagos.
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Affiliation(s)
- Samoa Asigau
- University of Missouri - St. Louis, Department of Biology, St. Louis, MO 63121, U.S.A
- Whitney R. Harris World Ecology Center, University of Missouri - St Louis, St. Louis, MO 63121, U.S.A
| | - Daniel A Hartman
- University of Missouri - St. Louis, Department of Biology, St. Louis, MO 63121, U.S.A
- Whitney R. Harris World Ecology Center, University of Missouri - St Louis, St. Louis, MO 63121, U.S.A
| | - Jenni M Higashiguchi
- University of Missouri - St. Louis, Department of Biology, St. Louis, MO 63121, U.S.A
- Whitney R. Harris World Ecology Center, University of Missouri - St Louis, St. Louis, MO 63121, U.S.A
| | - Patricia G Parker
- University of Missouri - St. Louis, Department of Biology, St. Louis, MO 63121, U.S.A
- WildCare Institute, St. Louis Zoo, St. Louis, MO 63110, U.S.A
- Charles Darwin Foundation, Puerto Ayora, Santa Cruz, Galapagos, Ecuador
- Whitney R. Harris World Ecology Center, University of Missouri - St Louis, St. Louis, MO 63121, U.S.A
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18
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Toral-Granda MV, Causton CE, Jäger H, Trueman M, Izurieta JC, Araujo E, Cruz M, Zander KK, Izurieta A, Garnett ST. Alien species pathways to the Galapagos Islands, Ecuador. PLoS One 2017; 12:e0184379. [PMID: 28902860 PMCID: PMC5597199 DOI: 10.1371/journal.pone.0184379] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 08/22/2017] [Indexed: 12/03/2022] Open
Abstract
Alien species, one of the biggest threats to natural ecosystems worldwide, are of particular concern for oceanic archipelagos such as Galápagos. To enable more effective management of alien species, we reviewed, collated and analysed all available records of alien species for Galápagos. We also assembled a comprehensive dataset on pathways to and among the Galápagos Islands, including tourist and resident numbers, tourist vessels, their itineraries and visitation sites, aircraft capacity and occupancy, air and sea cargo and biosecurity interceptions. So far, 1,579 alien terrestrial and marine species have been introduced to Galápagos by humans. Of these, 1,476 have become established. Almost half of these were intentional introductions, mostly of plants. Most unintentional introductions arrived on plants and plant associated material, followed by transport vehicles, and commodities (in particular fruit and vegetables). The number, frequency and geographic origin of pathways for the arrival and dispersal of alien species to and within Galápagos have increased over time, tracking closely the increase in human population (residents and tourists) on the islands. Intentional introductions of alien species should decline as biosecurity is strengthened but there is a danger that unintentional introductions will increase further as tourism on Galápagos expands. This unique world heritage site will only retain its biodiversity values if the pathways for invasion are managed effectively.
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Affiliation(s)
- M. Verónica Toral-Granda
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Casuarina, Northern Territory, Australia
- * E-mail:
| | | | - Heinke Jäger
- Charles Darwin Foundation, Puerto Ayora, Galápagos Islands, Ecuador
| | - Mandy Trueman
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Casuarina, Northern Territory, Australia
| | - Juan Carlos Izurieta
- Ministerio de Turismo del Ecuador-Observatorio de Turismo de Galápagos, Puerto Ayora, Galápagos Islands, Ecuador
| | - Eddy Araujo
- Dirección del Parque Nacional Galápagos, Puerto Ayora, Galápagos Islands, Ecuador
| | - Marilyn Cruz
- Agencia de Bioseguridad de Galápagos, Puerto Ayora, Galápagos Islands, Ecuador
| | - Kerstin K. Zander
- Northern Institute, Charles Darwin University, Casuarina, Northern Territory, Australia
| | - Arturo Izurieta
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Casuarina, Northern Territory, Australia
- Charles Darwin Foundation, Puerto Ayora, Galápagos Islands, Ecuador
| | - Stephen T. Garnett
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Casuarina, Northern Territory, Australia
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19
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Bullivant G, Martinou AF. Ascension Island: a survey to assess the presence of Zika virus vectors. J ROY ARMY MED CORPS 2017; 163:347-354. [DOI: 10.1136/jramc-2016-000730] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 01/30/2017] [Indexed: 11/04/2022]
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20
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Heylen D, Krawczyk A, Lopes de Carvalho I, Núncio MS, Sprong H, Norte AC. Bridging of cryptic Borrelia cycles in European songbirds. Environ Microbiol 2017; 19:1857-1867. [PMID: 28152581 DOI: 10.1111/1462-2920.13685] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 01/30/2017] [Indexed: 12/15/2022]
Abstract
The principal European vector for Borrelia burgdorferi s.l., the causative agents of Lyme disease, is the host-generalist tick Ixodes ricinus. Almost all terrestrial host-specialist ticks have been supposed not to contribute to the terrestrial Borrelia transmission cycles. Through an experiment with blackbirds, we show successful transmission by the widespread I. frontalis, an abundant bird-specialized tick that infests a broad range of songbirds. In the first phase of the experiment, we obtained Borrelia-infected I. frontalis (infection rate: 19%) and I. ricinus (17%) nymphs by exposing larvae to wild blackbirds that carried several genospecies (Borrelia turdi, B. valaisiana, B. burgdorferi s.s.). In the second phase, pathogen-free blackbirds were exposed to these infected nymphs. Both tick species were able to infect the birds, as indicated by the analysis of xenodiagnostic I. ricinus larvae which provided evidence for both co-feeding and systemic transmission (infection rates: 10%-60%). Ixodes frontalis was shown to transmit B. turdi spirochetes, while I. ricinus transmitted both B. turdi and B. valaisiana. Neither species transmitted B. burgdorferi s.s. European enzootic cycles of Borrelia between songbirds and their ornithophilic ticks do exist, with I. ricinus potentially acting as a bridging vector towards mammals, including man.
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Affiliation(s)
- Dieter Heylen
- Evolutionary Ecology Group, Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Aleksandra Krawczyk
- Laboratory for Zoonoses and Environmental Microbiology, National Institute for Public Health and Environment (RIVM), Bilthoven, the Netherlands
| | - Isabel Lopes de Carvalho
- Center for Vector and Infectious Diseases Research, National Institute of Health Doutor Ricardo Jorge, Lisbon, Portugal
| | - Maria Sofia Núncio
- Center for Vector and Infectious Diseases Research, National Institute of Health Doutor Ricardo Jorge, Lisbon, Portugal
| | - Hein Sprong
- Laboratory for Zoonoses and Environmental Microbiology, National Institute for Public Health and Environment (RIVM), Bilthoven, the Netherlands
| | - Ana Cláudia Norte
- Center for Vector and Infectious Diseases Research, National Institute of Health Doutor Ricardo Jorge, Lisbon, Portugal.,MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
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21
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Adams DJ, Rosenberg DE, Yirui H. Prevalence of vector-borne diseases in a sample of client-owned dogs on Santa Cruz in the Galápagos Islands: A pilot study. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2016; 6:28-30. [PMID: 31014524 DOI: 10.1016/j.vprsr.2016.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 11/12/2016] [Accepted: 11/28/2016] [Indexed: 10/20/2022]
Abstract
A population of approximately 2500 dogs inhabits the island of Santa Cruz in the Galápagos Islands and many of these dogs freely roam the streets of the island in close proximity to people. The dog population receives minimal, if any, veterinary care or ectoparasite prophylaxis, leaving the majority of the dogs at risk for vector-borne infections such as Anaplasma platys, Borrelia burgdorferi, Dirofilaria immitis, Ehrlichia canis, and Ehrlichia ewingii. Data on the prevalence of vector-borne disease in dogs on the island of Santa Cruz are lacking. The current study served as a pilot investigation to estimate the prevalence of circulating antibodies or prevalence of circulating antigen specific to these vector-borne agents in client-owned dogs through the use of IDEXX SNAP® 4Dx® Plus Tests. Of the 37 dogs screened, the prevalence of antibodies to Ehrlichia spp. was the highest at 37.84% (95% CI=24.10, 54.90%), followed by a prevalence of 13.51% (95% CI=2.58, 24.44%) for antibodies to Anaplasma species. Prevalence of antibodies to Borrelia burgdorferi was 0% (95% CI=0, 0%), and prevalence of Dirofilaria immitis antigen was also 0% (95% CI=0, 0%). Tick infestation (RR=2.90; p=0.03) and sex (RR=2.20; p=0.05) were statistically significant risk factors for exposure to either Ehrlichia or Anaplasma species. Considering the zoonotic potential of these pathogens, reducing the prevalence of infection in the dog population is crucial in preventing transmission to the island's inhabitants and its tourists. Therefore, prevalence determined in the current study serves as a useful estimate for future surveillance and is valuable for evaluating the effectiveness of future control measures.
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Affiliation(s)
- Daniel J Adams
- University of Pennsylvania School of Veterinary Medicine, 3800 Spruce Street, Philadelphia, PA 19104, United States.
| | - Danielle E Rosenberg
- University of Pennsylvania School of Veterinary Medicine, 3800 Spruce Street, Philadelphia, PA 19104, United States
| | - Heng Yirui
- University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Bearsden, Glasgow G61 1QH, United Kingdom
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22
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Kimble SJA, Karna AK, Johnson AJ, Hoverman JT, Williams RN. Mosquitoes as a Potential Vector of Ranavirus Transmission in Terrestrial Turtles. ECOHEALTH 2015; 12:334-338. [PMID: 25212726 DOI: 10.1007/s10393-014-0974-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2014] [Revised: 08/19/2014] [Accepted: 08/22/2014] [Indexed: 06/03/2023]
Abstract
Ranaviruses are significant pathogens of amphibians, reptiles, and fishes, contributing to mass mortality events worldwide. Despite an increasing focus on ranavirus ecology, our understanding of ranavirus transmission, especially among reptilian hosts, remains limited. For example, experimental evidence for oral transmission of the virus in chelonians is mixed. Consequently, vector-borne transmission has been hypothesized in terrestrial turtle species. To test this hypothesis, mosquitoes captured during a 2012/2013 ranavirus outbreak in box turtles from southwestern Indiana were pooled by genus and tested for ranavirus DNA using qPCR. Two of 30 pools tested positive for ranavirus. Additionally, an individual Aedes sp. mosquito observed engorging on a box turtle also tested positive for ranavirus. Although our approach does not rule out the possibility that the sequenced ranavirus was simply from virus in bloodmeal, it does suggests that mosquitoes may be involved in virus transmission as a mechanical or biological vector among ectothermic vertebrates. While additional studies are needed to elucidate the exact role of mosquitoes in ranavirus ecology, our study suggests that a greater focus on vector-borne transmission may be necessary to fully understand ranaviral disease dynamics in herpetofauna.
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Affiliation(s)
- Steven J A Kimble
- Department of Forestry and Natural Resources, College of Agriculture, Purdue University, 715 West State Street, West Lafayette, IN, USA.
| | - Ajit K Karna
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, 725 Harrison Street, West Lafayette, IN, USA
| | - April J Johnson
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, 725 Harrison Street, West Lafayette, IN, USA
| | - Jason T Hoverman
- Department of Forestry and Natural Resources, College of Agriculture, Purdue University, 715 West State Street, West Lafayette, IN, USA
| | - Rod N Williams
- Department of Forestry and Natural Resources, College of Agriculture, Purdue University, 715 West State Street, West Lafayette, IN, USA
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23
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Vinueza LR, Menge BA, Ruiz D, Palacios DM. Oceanographic and climatic variation drive top-down/bottom-up coupling in the Galápagos intertidal meta-ecosystem. ECOL MONOGR 2014. [DOI: 10.1890/13-0169.1] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Dijkstra KDB, Monaghan MT, Pauls SU. Freshwater biodiversity and aquatic insect diversification. ANNUAL REVIEW OF ENTOMOLOGY 2014; 59:143-63. [PMID: 24160433 PMCID: PMC4816856 DOI: 10.1146/annurev-ento-011613-161958] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Inland waters cover less than 1% of Earth's surface but harbor more than 6% of all insect species: Nearly 100,000 species from 12 orders spend one or more life stages in freshwater. Little is known about how this remarkable diversity arose, although allopatric speciation and ecological adaptation are thought to be primary mechanisms. Freshwater habitats are highly susceptible to environmental change and exhibit marked ecological gradients. Standing waters appear to harbor more dispersive species than running waters, but there is little understanding of how this fundamental ecological difference has affected diversification. In contrast to the lack of evolutionary studies, the ecology and habitat preferences of aquatic insects have been intensively studied, in part because of their widespread use as bioindicators. The combination of phylogenetics with the extensive ecological data provides a promising avenue for future research, making aquatic insects highly suitable models for the study of ecological diversification.
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Affiliation(s)
- Klaas-Douwe B. Dijkstra
- Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA, Leiden, The
Netherlands, and University Museum of Zoology, Cambridge, CB2 3EJ, United Kingdom
| | - Michael T. Monaghan
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB),
12587 Berlin, Germany;
| | - Steffen U. Pauls
- Biodiversity and Climate Research Centre, Frankfurt, Germany and
Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt,
Germany;
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25
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Pollution as an Emerging Threat for the Conservation of the Galapagos Marine Reserve: Environmental Impacts and Management Perspectives. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/978-3-319-02769-2_12] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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26
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Heylen D, Sprong H, van Oers K, Fonville M, Leirs H, Matthysen E. Are the specialized bird ticks, Ixodes arboricola and I. frontalis, competent vectors for Borrelia burgdorferi sensu lato? Environ Microbiol 2013; 16:1081-9. [PMID: 24237635 DOI: 10.1111/1462-2920.12332] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 11/05/2013] [Indexed: 11/30/2022]
Abstract
Our study tested whether two European bird-specialized ticks, Ixodes arboricola and I. frontalis, can act as vectors in the transmission cycles of Borrelia burgdorferi s.l. The ticks have contrasting ecologies but share songbird hosts (such as the great tit, Parus major) with the generalist I. ricinus which may therefore act as a bridging vector. In the first phase of the experiment, we obtained Borrelia-infected ornithophilic nymphs by exposing larvae to great tits that had previously been exposed to I. ricinus nymphs carrying a community of genospecies (Borrelia garinii, valaisiana, afzelii, burgdorferi s.s., spielmanii). Skin samples showed that birds selectively amplified B. garinii and B. valaisiana. The spirochetes were transmitted to the ornithophilic ticks and survived moulting, leading to infection rates of 16% and 27% in nymphs of I. arboricola and I. frontalis respectively. In the second phase, pathogen-free great tits were exposed to the Borrelia-infected ornithophilic nymphs. None of these ticks were able to infect the birds, as indicated by the tissue samples. Analysis of xenodiagnostic I. ricinus larvae found no evidence for co-feeding or systemic transmission of B. burgdorferi s.l. These outcomes do not support the occurrence of enzootic cycles of Borrelia burgdorferi s.l. involving songbirds and their specialized ornithophilic ticks.
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Affiliation(s)
- Dieter Heylen
- Department of Biology, University of Antwerp, Evolutionary Ecology Group, Belgium
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27
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Levin II, Zwiers P, Deem SL, Geest EA, Higashiguchi JM, Iezhova TA, Jiménez-Uzcátegui G, Kim DH, Morton JP, Perlut NG, Renfrew RB, Sari EHR, Valkiunas G, Parker PG. Multiple lineages of Avian malaria parasites (Plasmodium) in the Galapagos Islands and evidence for arrival via migratory birds. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2013; 27:1366-1377. [PMID: 24033638 DOI: 10.1111/cobi.12127] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/06/2013] [Indexed: 06/02/2023]
Abstract
Haemosporidian parasites in the genus Plasmodium were recently detected through molecular screening in the Galapagos Penguin (Spheniscus mendiculus). We summarized results of an archipelago-wide screen of 3726 endemic birds representing 22 species for Plasmodium spp. through a combination of molecular and microscopy techniques. Three additional Plasmodium lineages were present in Galapagos. Lineage A-infected penguins, Yellow Warblers (Setophaga petechia aureola), and one Medium Ground Finch (Geospiza fortis) and was detected at multiple sites in multiple years [corrected]. The other 3 lineages were each detected at one site and at one time; apparently, they were transient infections of parasites not established on the archipelago. No gametocytes were found in blood smears of infected individuals; thus, endemic Galapagos birds may be dead-end hosts for these Plasmodium lineages. Determining when and how parasites and pathogens arrive in Galapagos is key to developing conservation strategies to prevent and mitigate the effects of introduced diseases. To assess the potential for Plasmodium parasites to arrive via migratory birds, we analyzed blood samples from 438 North American breeding Bobolinks (Dolichonyx oryzivorus), the only songbird that regularly migrates through Galapagos. Two of the ephemeral Plasmodium lineages (B and C) found in Galapagos birds matched parasite sequences from Bobolinks. Although this is not confirmation that Bobolinks are responsible for introducing these lineages, evidence points to higher potential arrival rates of avian pathogens than previously thought. Linajes Múltiples de Parásitos de Malaria Aviar (Plasmodium) en las Islas Galápagos y Evidencia de su Arribo por Medio de Aves Migratorias.
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Affiliation(s)
- I I Levin
- Department of Biology, University of Missouri-St. Louis, One University Blvd, St. Louis, MO, 63121, U.S.A.; Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Blvd, St. Louis, MO, 63121, U.S.A.; WildCare Institute, Saint Louis Zoo, St. Louis, MO, 63110, U.S.A..
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28
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Eastwood G, Goodman SJ, Cunningham AA, Kramer LD. Aedes taeniorhynchus vectorial capacity informs a pre-emptive assessment of West Nile virus establishment in Galápagos. Sci Rep 2013; 3:1519. [PMID: 23519190 PMCID: PMC3605609 DOI: 10.1038/srep01519] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 02/14/2013] [Indexed: 11/09/2022] Open
Abstract
Increased connectivity with the mainland has led to the arrival of many invasive species to the Galápagos Islands, including novel pathogens, threatening the archipelago's unique fauna. Here we consider the potential role of the mosquito Aedes taeniorhynchus in maintaining the flavivirus West Nile virus [WNV] should it reach the islands. We report on three components of vectorial capacity - vector competency, distributional abundance and host-feeding. In contrast to USA strains, Galápagos A. taeniorhynchus is a competent and efficient WNV vector, capable of transmission at 5 days post-exposure. Based on 25 blood-meals, mammalian feeding suggests a potential bridge vector role should contact with key amplification taxa occur. Vector population abundance is driven primarily by climatic factors, peaking between January and March. As a ubiquitous competent vector, A. taeniorhynchus may facilitate future WNV establishment, therefore it is vital to ensure the biosecurity of Galápagos to prevent introductions of pathogens such as WNV.
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29
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Zylberberg M, Lee KA, Klasing KC, Wikelski M. Variation with land use of immune function and prevalence of avian pox in Galapagos finches. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2013; 27:103-112. [PMID: 23082926 DOI: 10.1111/j.1523-1739.2012.01944.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 06/02/2012] [Indexed: 06/01/2023]
Abstract
Introduced disease has been implicated in recent wildlife extinctions and population declines worldwide. Both anthropogenic-induced change and natural environmental features can affect pathogen spread. Furthermore, environmental disturbance can result in changes in stress physiology, nutrition, and social structure, which in turn can suppress immune system function. However, it remains unknown whether landscape variation results in heterogeneity in host resistance to pathogens. Avian pox virus, a pathogen implicated in avian declines and extinctions in Hawaii, was introduced to the Galapagos in the 1890 s, and prevalence (total number of current infections) has increased recently in finches. We tested whether prevalence and recovery trends in 7 species of Galapagos finches varied by elevation or human land use. To do so, we used infection data obtained from 545 wild-caught birds. In addition, we determined whether annual changes in 4 aspects of innate immune function (complement protein activity, natural antibody activity, concentration of PIT54 protein, and heterophil:lymphocyte ratio) varied by elevation or land use. Prevalence and recovery rates did not vary by elevation from 2008 to 2009. Avian pox prevalence and proportion of recovered individuals in undeveloped and urban areas did not change from 2008 to 2009. In agricultural areas, avian pox prevalence increased 8-fold (from 2% to 17% of 234 individuals sampled) and proportion of recovered individuals increased (11% to 19%) from 2008 to 2009. These results suggest high disease-related mortality. Variation in immune function across human land-use types correlated with variation in both increased prevalence and susceptibility, which indicates changes in innate immune function may underlie changes in disease susceptibility. Our results suggest anthropogenic disturbance, in particular agricultural practices, may underlie immunological changes in host species that themselves contribute to pathogen emergence.
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Affiliation(s)
- Maxine Zylberberg
- University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
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Heylen D, Tijsse E, Fonville M, Matthysen E, Sprong H. Transmission dynamics of Borrelia burgdorferi s.l. in a bird tick community. Environ Microbiol 2012; 15:663-73. [PMID: 23279105 DOI: 10.1111/1462-2920.12059] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 11/21/2012] [Accepted: 11/23/2012] [Indexed: 11/28/2022]
Abstract
We examined the Borrelia burgdorferi sensu lato circulation in a tick community consisting of three species (Ixodes ricinus, I. frontalis, I. arboricola) with contrasting ecologies, but sharing two European songbird hosts (Parus major and Cyanistes caeruleus). Parus major had the highest infestation rates, primarily due to larger numbers of I. ricinus, and probably because of their greater low-level foraging. The prevalence of Borrelia in feeding ticks did not significantly differ between the two bird species; however, P. major in particular hosted large numbers of Borrelia-infected I. frontalis and I. ricinus larvae, suggesting that the species facilitates Borrelia transmission. The low but significant numbers of Borrelia in questing I. arboricola ticks also provides the first field data to suggest that it is competent in maintaining Borrelia. Aside from Borrelia garinii, a high number of less dominant genospecies was observed, including several mammalian genospecies and the first record of Borrelia turdi for North-Western Europe. Borrelia burgdorferi sensu lato IGS genotypes were shared between I. arboricola and I. ricinus and between I. frontalis and I. ricinus, but not between I. arboricola and I. frontalis. This suggests that the Borrelia spp. transmission cycles can be maintained by bird-specific ticks, and bridged by I. ricinus to other hosts outside bird-tick cycles.
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Affiliation(s)
- Dieter Heylen
- Evolutionary Ecology Group, Department of Biology, University of Antwerp, Antwerp, Belgium.
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Bataille A, Fournié G, Cruz M, Cedeño V, Parker PG, Cunningham AA, Goodman SJ. Host selection and parasite infection in Aedes taeniorhynchus, endemic disease vector in the Galápagos Islands. INFECTION GENETICS AND EVOLUTION 2012; 12:1831-41. [PMID: 22921730 DOI: 10.1016/j.meegid.2012.07.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 06/29/2012] [Accepted: 07/18/2012] [Indexed: 11/25/2022]
Abstract
Host selection in blood-sucking arthropods has important evolutionary and ecological implications for the transmission dynamics, distribution and host-specificity of the parasites they transmit. The black salt-marsh mosquito (Aedes taeniorhynchus Wiedemann) is distributed throughout tropical to temperate coastal zones in the Americas, and continental populations are primarily mammalphilic. It is the only indigenous mosquito in the Galápagos Islands, having colonised the archipelago around 200,000 years ago, potentially adapting its host selection, and in the process, altering the dynamics of vector mediated pathogen interactions in the archipelago. Here, we use blood-meal analysis and PCR-based parasite screening approach to determine the blood-feeding patterns of A. taeniorhynchus in the Galápagos Islands and identify potential parasite transmission with which this mosquito could be involved. Our results show that A. taeniorhynchus feeds equally on mammals and reptiles, and only one avian sample was observed in 190 successful PCR amplifications from blood meals. However, we detected endemic filarial worms and Haemoproteus parasites known to infect various Galápagos bird species in mosquito thoraces, suggesting that feeding on birds must occur at low frequency, and that A. taeniorhynchus may play a role in maintaining some avian vector-borne pathogens, although more work is needed to explore this possibility. We also isolated three different DNA sequences corresponding to hemogregarine parasites of the genus Hepatozoon from mosquito and iguana blood samples, suggesting that more than one species of Hepatozoon parasites are present in Galápagos. Phylogenetic analysis of Hepatozoon 18sRNA sequences indicates that A. taeniorhynchus may have facilitated a recent breakdown in host-species association of formerly isolated Hepatozoon spp. infecting the reptile populations in the Galápagos Islands.
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Affiliation(s)
- Arnaud Bataille
- Institute of Integrative and Comparative Biology, University of Leeds, Leeds LS2 9JT, UK.
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Distribution and abundance of Darwin’s finches and other land birds on Santa Cruz Island, Galápagos: evidence for declining populations. ORYX 2011. [DOI: 10.1017/s0030605311000597] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
AbstractPopulation monitoring is a vital tool for conservation management and for testing hypotheses about population trends in changing environments. Darwin’s finches on Santa Cruz Island in the Galápagos archipelago have experienced habitat alteration because of human activity, introduced predators, parasites and disease. We used point counts to conduct systematic quantitative surveys of Darwin’s finches and other land birds between 1997 and 2010. The temporal analysis revealed that six of the nine species investigated declined significantly and that this decline was most pronounced at higher elevations in humid native forest and agricultural areas; the highland areas have been most affected by introduced species or direct human impact. Five of the six declining species are insectivorous, which suggests that changes in insect abundance or insect availability are a critical factor in the declines. Further study is required to test this idea. Other factors including habitat alteration and introduced parasites or pathogens may be contributing to the observed declines.
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Bataille A, Cunningham AA, Cruz M, Cedeño V, Goodman SJ. Adaptation, isolation by distance and human-mediated transport determine patterns of gene flow among populations of the disease vector Aedes taeniorhynchus in the Galapagos Islands. INFECTION GENETICS AND EVOLUTION 2011; 11:1996-2003. [PMID: 21968211 DOI: 10.1016/j.meegid.2011.09.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 09/04/2011] [Accepted: 09/05/2011] [Indexed: 12/01/2022]
Abstract
The black salt-marsh mosquito (Aedes taeniorhynchus) is the only native mosquito in the Galapagos Islands and potentially a major disease vector for Galapagos wildlife. Little is known about its population structure, or how its dynamics may be influenced by human presence in the archipelago. We used microsatellite data to assess the structure and patterns of A. taeniorhynchus gene flow among and within islands, to identify potential barriers to mosquito dispersal, and to investigate human-aided transport of mosquitoes across the archipelago. Our results show that inter-island migration of A. taeniorhynchus occurs frequently on an isolation by distance basis. High levels of inter-island migration were detected amongst the major ports of the archipelago, strongly suggesting the occurrence of human-aided transport of mosquitoes among islands, underlining the need for strict control measures to avoid the transport of disease vectors between islands. The prevalence of filarial nematode infection in Galapagos flightless cormorants is correlated with the population structure and migration patterns of A. taeniorhynchus, suggesting that A. taeniorhynchus is an important vector of this arthropod-borne parasite in the Galapagos Islands. Therefore mosquito population structure in Galapagos may have the potential to influence mosquito-borne parasite population dynamics, and the subsequent impacts of such pathogens on their host species in the islands.
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Affiliation(s)
- Arnaud Bataille
- Institute of Integrative and Comparative Biology, University of Leeds, Leeds LS2 9JT, UK
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Eastwood G, Kramer LD, Goodman SJ, Cunningham AA. West Nile virus vector competency of Culex quinquefasciatus mosquitoes in the Galapagos Islands. Am J Trop Med Hyg 2011; 85:426-33. [PMID: 21896799 PMCID: PMC3163861 DOI: 10.4269/ajtmh.2011.10-0739] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Accepted: 05/09/2011] [Indexed: 11/07/2022] Open
Abstract
The mosquito-transmitted pathogen West Nile virus (WNV) is not yet present in the Galápagos Archipelago of Ecuador. However, concern exists for fragile endemic island fauna after population decreases in several North American bird species and pathology in certain reptiles. We examined WNV vector competency of a Galápagos strain of mosquito (Culex quinquefasciatus Say). Field specimens were tested for their capacity to transmit the WN02-1956 strain of WNV after incubation at 27°C or 30°C. Rates of infection, dissemination, and transmission all increased with days post-exposure to WNV, and the highest rates were observed at 28 days. Infection rates peaked at 59% and transmission rates peaked at 44% (of mosquitoes tested). Vector efficiency increased after day 14. Rates of infection but not of transmission were significantly influence by temperature. No vertical transmission was detectable. We demonstrate that Galápagos Cx. quinquefasciatus are competent WNV vectors, and therefore should be considered an animal and public health risk for the islands and controlled wherever possible.
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Carlson JS, Martínez-Gómez JE, Cornel A, Loiseau C, Sehgal RNM. Implications of Plasmodium parasite infected mosquitoes on an insular avifauna: the case of Socorro Island, México. JOURNAL OF VECTOR ECOLOGY : JOURNAL OF THE SOCIETY FOR VECTOR ECOLOGY 2011; 36:213-220. [PMID: 21635660 DOI: 10.1111/j.1948-7134.2011.00159.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Avian malaria (Plasmodium spp.) has been implicated in the decline of avian populations in the Hawaiian Islands and it is generally agreed that geographically isolated and immunologically naïve bird populations are particularly vulnerable to the pathogenic effects of invasive malaria parasites. In order to assess the potential disease risk of malaria to the avifauna of Socorro Island, México, we surveyed for Plasmodium isolates from 1,300 resident field-caught mosquitoes. Most of them were identified as Aedes (Ochlerotatus) taeniorhynchus (Wiedemann, 1821), which were abundant in the salt marshes. We also collected Culex quinquefasciatus Say, 1823 close to human dwellings. Mitochondrial ND5 and COII gene sequences of Ae. taeniorhynchus were analyzed and compared to corresponding sequences of mosquitoes of the Galápagos Islands, Latin America, and the North American mainland. Aedes lineages from Socorro Island clustered most closely with a lineage from the continental U.S. Plasmodium spp. DNA was isolated from both species of mosquitoes. From 38 positive pools, we isolated 11 distinct mitochondrial Cytb lineages of Plasmodium spp. Seven of the Plasmodium lineages represent previously documented avian infective strains while four were new lineages. Our results confirm a potential risk for the spread of avian malaria and underscore the need to monitor both the mosquito and avian populations as a necessary conservation measure to protect endangered bird species on Socorro Island.
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Affiliation(s)
- Jenny S Carlson
- Department of Biology, San Francisco State University, San Francisco, CA 94132, USA
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Zhao L, Chen J, Becnel JJ, Kline DL, Clark GG, Linthicum KJ. Identification and transcription profiling of trypsin in Aedes taeniorhynchus (Diptera: Culicidae): developmental regulation, blood feeding, and permethrin exposure. JOURNAL OF MEDICAL ENTOMOLOGY 2011; 48:546-553. [PMID: 21661315 DOI: 10.1603/me10211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The cDNA of a trypsin gene from Aedes (Ochlerotatus) taeniorhynchus (Weidemann) was cloned and sequenced. The full-length mRNA sequence (890 bp) for trypsin from Ae. taeniorhynchus (AetTryp1) was obtained, which encodes an open reading frame of 765 bp (i.e., 255 amino acids). To detect whether AetTryp is developmentally regulated, a quantitative real-time polymerase chain reaction was used to examine AetTrypl mRNA expression levels in different developmental stages of Ae. taeniorhynchus. AetTryp1 was expressed at low levels in egg, larval, and pupal stages, but was differentially expressed in adult Ae. taeniorhynchus, with highest levels found in 5-d-old female adults when compared with teneral adults. In addition, AetTryp1 mRNA expression differed between sexes, with expression levels much lower in males. However, in both males and females, there was a significant increase in AetTryp1 transcription levels as age increased and peaked in 5-d-old adults. AetTrypl expressed in 5-d-old female Ae. taeniorhynchus significantly increased after 30 min postblood feeding compared with the control. The AetTryp1 mRNA expression in 5-d-old female Ae. taeniorhynchus was affected by different concentrations of permethrin.
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Affiliation(s)
- Liming Zhao
- Biological Control of Pests Research Unit, Mid-Southern Area-United States Department of Agriculture-Agricultural Research Service, 59 Lee Road, Stoneville, MS 38776, USA.
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Parker PG, Buckles EL, Farrington H, Petren K, Whiteman NK, Ricklefs RE, Bollmer JL, Jiménez-Uzcátegui G. 110 years of Avipoxvirus in the Galapagos Islands. PLoS One 2011; 6:e15989. [PMID: 21249151 PMCID: PMC3020966 DOI: 10.1371/journal.pone.0015989] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Accepted: 12/02/2010] [Indexed: 12/04/2022] Open
Abstract
The role of disease in regulating populations is controversial, partly owing to the absence of good disease records in historic wildlife populations. We examined birds collected in the Galapagos Islands between 1891 and 1906 that are currently held at the California Academy of Sciences and the Zoologisches Staatssammlung Muenchen, including 3973 specimens representing species from two well-studied families of endemic passerine birds: finches and mockingbirds. Beginning with samples collected in 1899, we observed cutaneous lesions consistent with Avipoxvirus on 226 (6.3%) specimens. Histopathology and viral genotyping of 59 candidate tissue samples from six islands showed that 21 (35.6%) were positive for Avipoxvirus, while alternative diagnoses for some of those testing negative by both methods were feather follicle cysts, non-specific dermatitis, or post mortem fungal colonization. Positive specimens were significantly nonrandomly distributed among islands both for mockingbirds (San Cristobal vs. Espanola, Santa Fe and Santa Cruz) and for finches (San Cristobal and Isabela vs. Santa Cruz and Floreana), and overall highly significantly distributed toward islands that were inhabited by humans (San Cristobal, Isabela, Floreana) vs. uninhabited at the time of collection (Santa Cruz, Santa Fe, Espanola), with only one positive individual on an uninhabited island. Eleven of the positive specimens sequenced successfully were identical at four diagnostic sites to the two canarypox variants previously described in contemporary Galapagos passerines. We conclude that this virus was introduced late in 1890′s and was dispersed among islands by a variety of mechanisms, including regular human movements among colonized islands. At present, this disease represents an ongoing threat to the birds on the Galapagos Islands.
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Affiliation(s)
- Patricia G Parker
- Department of Biology, University of Missouri-St. Louis, St. Louis, Missouri, United States of America.
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Bataille A, Cunningham AA, Cruz M, Cedeno V, Goodman SJ. Seasonal effects and fine-scale population dynamics of Aedes taeniorhynchus, a major disease vector in the Galapagos Islands. Mol Ecol 2010; 19:4491-504. [PMID: 20875066 DOI: 10.1111/j.1365-294x.2010.04843.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Characterization of the fine-scale population dynamics of the mosquito Aedes taeniorhynchus is needed to improve our understanding of its role as a disease vector in the Galapagos Islands. We used microsatellite data to assess the genetic structure of coastal and highland mosquito populations and patterns of gene flow between the two habitats through time on Santa Cruz Island. In addition, we assessed possible associations of mosquito abundance and genetic diversity with environmental variables. The coastal and highland mosquito populations were highly differentiated from each other all year round, with some gene flow detected only during periods of increased precipitation. The results support the hypothesis that selection arising from ecological differences between habitats is driving adaptation and divergence in A. taeniorhynchus, and maintaining long-term genetic differentiation of the populations against gene flow. The highland and lowland populations may constitute an example of incipient speciation in progress. Highland populations were characterized by lower observed heterozygosity and allelic richness, suggesting a founder effect and/or lower breeding site availability in the highlands. A lack of reduction in genetic diversity over time in highland populations suggests that they survive dry periods as dormant eggs. Association between mosquito abundance and precipitation was strong in the highlands, whereas tide height was the main factor affecting mosquito abundance on the coast. Our findings suggests differences in the infection dynamics of mosquito-borne parasites in the highlands compared to the coast, and a higher risk of mosquito-driven disease spread across these habitats during periods of increased precipitation.
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Affiliation(s)
- Arnaud Bataille
- Institute of Integrative and Comparative Biology, University of Leeds, Leeds LS2 9JT, UK
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Fessl B, Young GH, Young RP, Rodríguez-Matamoros J, Dvorak M, Tebbich S, Fa JE. How to save the rarest Darwin's finch from extinction: the mangrove finch on Isabela Island. Philos Trans R Soc Lond B Biol Sci 2010; 365:1019-30. [PMID: 20194165 PMCID: PMC2830234 DOI: 10.1098/rstb.2009.0288] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Habitat destruction and predation by invasive alien species has led to the disappearance of several island populations of Darwin's finches but to date none of the 13 recognized species have gone extinct. However, driven by rapid economic growth in the Galápagos, the effects of introduced species have accelerated and severely threatened these iconic birds. The critically endangered mangrove finch (Camarhynchus heliobates) is now confined to three small mangroves on Isabela Island. During 2006-2009, we assessed its population status and monitored nesting success, both before and after rat poisoning. Population size was estimated at around only 100 birds for the two main breeding sites, with possibly 5-10 birds surviving at a third mangrove. Before rat control, 54 per cent of nests during incubation phase were predated with only 18 per cent of nests producing fledglings. Post-rat control, nest predation during the incubation phase fell to 30 per cent with 37 per cent of nests producing fledglings. During the nestling phase, infestation by larvae of the introduced parasitic fly (Philornis downsi) caused 14 per cent additional mortality. Using population viability analysis, we simulated the probability of population persistence under various scenarios of control and showed that with effective management of these invasive species, mangrove finch populations should start to recover.
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Affiliation(s)
- Birgit Fessl
- Durrell Wildlife Conservation Trust, Les Augrès Manor, Trinity, Jersey JE3 5BP, Channel Islands
- Charles Darwin Foundation, Puerto Ayora, Santa Cruz Island, Galápagos, Ecuador
| | - Glyn H. Young
- Durrell Wildlife Conservation Trust, Les Augrès Manor, Trinity, Jersey JE3 5BP, Channel Islands
| | - Richard P. Young
- Durrell Wildlife Conservation Trust, Les Augrès Manor, Trinity, Jersey JE3 5BP, Channel Islands
- University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Jorge Rodríguez-Matamoros
- CBSG Mesoamerica, Parque Zoológico y Jardín Botánico Nacional Simón Bolívar, Avenida 11 calle 10, San José, Costa Rica
| | - Michael Dvorak
- BirdLife Austria, Museumsplatz 1/10/8, A-1070 Vienna, Austria
| | - Sabine Tebbich
- Department of Neurobiology and Cognition Research, University of Vienna, A-1090 Vienna, Austria
| | - John E. Fa
- Durrell Wildlife Conservation Trust, Les Augrès Manor, Trinity, Jersey JE3 5BP, Channel Islands
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Bataille A, Cunningham AA, Cedeño V, Cruz M, Eastwood G, Fonseca DM, Causton CE, Azuero R, Loayza J, Martinez JDC, Goodman SJ. Evidence for regular ongoing introductions of mosquito disease vectors into the Galapagos Islands. Proc Biol Sci 2009; 276:3769-75. [PMID: 19675009 DOI: 10.1098/rspb.2009.0998] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Wildlife on isolated oceanic islands is highly susceptible to the introduction of pathogens. The recent establishment in the Galápagos Islands of the mosquito Culex quinquefasciatus, a vector for diseases such as avian malaria and West Nile fever, is considered a serious risk factor for the archipelago's endemic fauna. Here we present evidence from the monitoring of aeroplanes and genetic analysis that C. quinquefasciatus is regularly introduced via aircraft into the Galápagos Archipelago. Genetic population structure and admixture analysis demonstrates that these mosquitoes breed with, and integrate successfully into, already-established populations of C. quinquefasciatus in the Galápagos, and that there is ongoing movement of mosquitoes between islands. Tourist cruise boats and inter-island boat services are the most likely mechanism for transporting Culex mosquitoes between islands. Such anthropogenic mosquito movements increase the risk of the introduction of mosquito-borne diseases novel to Galápagos and their subsequent widespread dissemination across the archipelago. Failure to implement and maintain measures to prevent the human-assisted transport of mosquitoes to and among the islands could have catastrophic consequences for the endemic wildlife of Galápagos.
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Affiliation(s)
- Arnaud Bataille
- Institute of Integrative and Comparative Biology, University of Leeds, Leeds, UK.
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