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198 resultados encontrados para: AUTOR: González, David
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1.
Artículo
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Resumen en: Inglés |
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The oceanographic conditions of the Pacific Ocean are largely modified by El Niño (EN), affecting several ecological processes. Parasites and other marine organisms respond to environmental variation, but the influence of the EN cycle on the seasonal variation of parasitic copepods has not been yet evaluated. We analysed the relation between infection parameters (prevalence and mean intensity) of the widespread parasitic copepods Caligus bonito and Charopinopsis quaternia in the dolphinfish Coryphaena hippurus and oceanography during the strong 2015–16 EN. Fish were collected from capture fisheries on the Ecuadorian coast (Tropical Eastern Pacific) over a 2-year period. Variations of sea surface temperature (SST), salinity, chlorophyll a (Chl-a), Oceanic Niño Index (ONI), total host length (TL) and monthly infection parameters of both copepod species were analysed using time series and cross-correlations.

We used the generalised additive models for determine the relationship between environmental variables and infection parameters. The total body length of the ovigerous females and the length of the eggs of C. bonito were measured in both periods. Infection parameters of both C. bonito and Ch. quaternia showed seasonal and annual patterns associated with the variation of environmental variables examined (SST, salinity, Chl-a and ONI 1+2). Infection parameters of both copepod species were significantly correlated with ONI 1+2, SST, TL and Chl-a throughout the GAMLSS model, and the explained deviance contribution ranged from 16%-36%. Our results suggest than an anomaly higher than +0.5°C triggers a risen in infection parameters of both parasitic copepods. This risen could be related to increases in egg length, female numbers and the total length of the ovigerous females in EN period. This study provides the first evidence showing that tropical parasitic copepods are sensitive to the influence of EN event, especially from SST variations. The observed behaviour of parasitic copepods likely affects the host populations and structure of the marine ecosystem at different scales.


2.
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DNA barcoding as a diagnostic tool of a rare human parasitosis: the first case of Lagochilascaris minor in Quintana Roo, Mexico
González Solís, David ; Elías Gutiérrez, Manuel (coaut.) ; Prado Bernal, Jenny Alexandra (coaut.) ; García de la Cruz, Miguel Alfredo (coaut.) ;
Contenido en: Journal of Parasitology Vol. 105, no. 2 (2019), p. 351–358 ISSN: 0022-3395
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Resumen en: Inglés |
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Recently, DNA barcoding based on the mitochondrial gene cytochrome c oxidase subunit 1 (COI) has become a widespread tool to identify animals. Its use with parasites of humans has been limited with some groups of nematodes where the amplification of this gene has been difficult. In this study, we present the first COI barcode sequence of a rare parasite from tropical regions, Lagochilascaris minor, which parasitized a human host from Quintana Roo, southern Yucatán Peninsula, Mexico. Destruction of the mastoid apophysis in the lateral sinus and cerebellar involvement were observed at the site of infection. After a radical mastoidectomy and a treatment with 200 mg oral albendazole for 63 days, the patient completely recovered. Lagochilascaris minor was identified based on the ratio between length of spicules and ejaculatory duct, shape of eggs, and host, as well as comparison with its congeners. The mode of infection is unknown, although it could be after direct exposure to eggs or consumption of uncooked wild meat. Morphology of adults is demonstrated using scanning electron microscopy, and high-quality sequences of COI barcode are presented from amplifications using semi-degenerate primers designed for micro-crustaceans. DNA barcoding proved to be a reliable identification method for L. minor. A comparison of the sequences for this species with 81 ascaridoids obtained from the Barcode of Life Database places it in a unique clade most closely related to Baylisascaris procyonis. Future diagnosis of larval and adult stages of L. minor using DNA barcoding will allow the recognition of its infection parameters, transmission, and precise epidemiology. Reports of lagochilascarosis in the Yucata´n Peninsula have been occurred over the last decade, suggesting it is an emerging zoonotic disease in the region.


3.
Artículo
Fertility life tables of Raoiella indica (Trombidiformes: Tenuipalpidae) at different temperature and humidity levels
Martínez Mejía, David (autor) ; Otero Colina, Gabriel (autor) ; González Gómez, Rebeca (autora) ; Pérez Panduro, Alejandro (autor) ; Valle Mora, Javier Francisco (autor) ;
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Contenido en: Revista Colombiana de Entomología Volumen 45, número 1, e7810 (2019), p. 1-8 ISSN: 2665-4385
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Resumen en: Español | Inglés |
Resumen en español

Se realizó un estudio de tablas de vida y fecundidad de Raoiella indica en foliolos de palma de coco (Cocos nucifera) a temperatura y humedad relativa (HR) controladas, en Texcoco, México, con el objetivo de estimar los parámetros de incremento poblacional de este ácaro. Cohortes de 50 huevos de Raoiella indica de 12 horas de edad se incubaron a 22,5, 25, 27,5 o 30 °C y 40-50 % de HR, así como a 27,5 °C con 30-40, 60-70 u 80-90 % de HR. Se les observó diariamente hasta que murió el último. A las hembras que alcanzaron el estado adulto se les proporcionaron dos machos para promover su apareamiento y luego se registró diariamente su oviposición. Machos de un día de edad se pusieron diariamente en contacto cada uno con una deutoninfa quiescente hembra para observar cuántas veces un macho podía copular, cuando las deutoninfas alcanzaran el estado adulto. Con todas las temperaturas y HR’s, la mortalidad se distribuyó uniformemente a lo largo de las observaciones. Tasa de desarrollo, reproducción y, consecuentemente, parámetros de incremento poblacional, estuvieron significativamente asociados con la temperatura. La mayor tasa intrínseca de incremento poblacional ocurrió a 27,5 °C y 40-50 % de HR. Por sí sola, la HR no afectó significativamente a dichas variables, aunque sus valores extremos tuvieron ligeros efectos negativos. Se observaron aproximadamente cuatro hembras por cada macho. Los machos copularon en promedio con 4,56 hembras; ello sugiere que entre 20 y 30 % de machos bastan para fecundar a todas las hembras presentes.

Resumen en inglés

A study of fertility life tables of Raoiella indica was carried out on coconut (Cocos nucifera) leaflets at controlled temperature and relative humidity (RH) in Texcoco, Mexico, with the objective of estimating the parameters of population increase of this mite. Cohorts of 12-hour-old Raoiella indica eggs were incubated at 22.5, 25, 27.5 or 30 °C and 40-50 % RH, as well as 27.5 °C with 30-40, 60-70 or 80-90 % RH. They were observed daily until the last mite died. Females that attained adulthood were provided with two males to promote mating and their oviposition was recorded daily. Each one-day-old male was put in contact with a female quiescent deutonymph daily to determine how many times a male could copulate after the deutonymph became an adult. With all temperatures and RH’s, mortality was evenly distributed throughout the observations. Developmental rate, reproduction, and, consequently, parameters of population increase were significantly associated with temperature. The highest rate of population increase took place at 27.5 °C and 40-40 RH. By itself, RH did not significantly affect those variables, although its extreme values showed slight negative effects. Approximately four females per male were observed. Males copulated with 4.56 females on average; this suggests that between 20 and 30 % of the males are enough to fertilize all females present.


4.
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First description of the male and subgravid female of Philometra serranellicabrillae Janiszewska, 1949 (Nematoda: Philometridae), a gonad-infecting parasite of the comber Serranus cabrilla (Linnaeus) (Serranidae) off Tunisia
Ghanmi, Nessrine (autora) ; González Solís, David (autor) ; Gargouri, Lamia (autora) ;
Contenido en: Systematic Parasitology Vol. 96, no. 8 (2019), p. 673–679 ISSN: 0165-5752
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The male and subgravid female of Philometra serranellicabrillae Janiszewska, 1949 (Philometridae) collected from the gonads of Serranus cabrilla (Linnaeus) (Serranidae) off Tunisia are described for the first time based on light and scanning electron microscopical studies. The male of this nematode can be separated from other congeneric gonad-infecting nominal species in the structure and shape of the gubernaculum (e.g. absence of a dorsal protuberance and a median smooth field). The shape ofthe male posterior region is unique in that it bears apair of big circular papillae posterior to the cloacal opening, which is also present in other Philometra spp. from serranids, i.e. P. indica Moravec & Manoharan, 2014, P. inexpectata Moravec, Chaabane, Justine & Neifar, 2016 and P. jordanoi (López-Neyra, 1951) Yamaguti, 1961. Moreover, P. serranellicabrillae differs from its congeners in other fish families from the Mediterranean Sea, in the length of spicules and gubernaculum.


5.
Artículo
First molecular characterization of Linguatula recurvata (Pentastomida) and first record in Baird's Tapir (Tapirus bairdii) from Calakmul, Mexico
Pérez Flores, Jonathan Sechaly (autor) ; Lagunas Calvo, Omar (autor) ; González Solís, David (autor) ; Oceguera Figueroa, Alejandro (autor) ;
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Contenido en: Comparative Parasitology Volumen 86, número 2 (2019), páginas 135-141 ISSN: 1525-2647
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The genus Linguatula (Pentastomida) is cosmopolitan and includes 6 species that have a higher prevalence in subtropical, tropical, and temperate regions. Larvae (nymphs) of Linguatula spp. require an intermediate host (herbivorous), while the adult worms inhabit the respiratory tract of wild and domestic carnivores. During an ongoing project on conservation biology of Baird’s tapir (Tapirus bairdii), 3 pentastome nymphs were found parasitizing the liver, mesentery, and small intestine of an adult male from the region of Calakmul, Campeche, Mexico. Based on morphological and molecular data, these specimens correspond to Linguatula recurvata. Here, we present the first record of a linguatulid parasitizing a Tapirus sp., and only the second of a pentastomid in tapirs. In addition, this work includes for the first time sequences of the mitochondrial cytochrome c oxidase subunit I of L. recurvata.


6.
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Global distribution of earthworm diversity
Phillips, Helen R. P. (autora) ; Guerra, Carlos A. (autor) ; Bartz, Marie L. C. (coaut.) ; Briones, Maria J. I. (autora) ; Brown, George (autor) ; Crowther, Thomas W. (autor) ; Ferlian, Olga (autora) ; Gongalsky, Konstantin B. (autor) ; van den Hoogen, Johan (autor) ; Krebs, Julia (autora) ; Orgiazzi, Alberto (autor) ; Routh, Devin (autor) ; Schwarz, Benjamin (autor) ; Bach, Elizabeth M. (autora) ; Bennett, Joanne (coaut.) ; Brose, Ulrich (coaut.) ; Decaëns, Thibaud (coaut.) ; König Ries, Birgitta (coaut.) ; Loreau, Michel (autor) ; Mathieu, Jérôme (coaut.) ; Mulder, Christian (coaut.) ; van der Putten, Wim H. (coaut.) ; Ramirez, Kelly S. (coaut.) ; Rillig, Matthias C. (autor) ; Russell, David (autor) ; Rutgers, Michiel (autor) ; Thakur, Madhav P. (coaut.) ; de Vries, Franciska T. (autora) ; Wall, Diana H. (autora) ; Wardle, David A. (autor) ; Arai, Miwa (coaut.) ; Ayuke, Fredrick O. (autor) ; Baker, Geoff H. (coaut.) ; Beauséjour, Robin (autor) ; Bedano, José C. (autor) ; Birkhofer, Klaus (coaut.) ; Blanchart, Eric (autor) ; Blossey, Bernd (autor) ; Bolger, Thomas (autor) ; Bradley, Robert L. (autor) ; Callaham, Mac A. (coaut.) ; Capowiez, Yvan (coaut.) ; Caulfield, Mark E. (coaut.) ; Choi, Amy (coaut.) ; Crotty, Felicity V. (coaut.) ; Dávalos, Andrea (coaut.) ; Díaz Cosin, Darío J. (autor) ; Domínguez, Anahí (autora) ; Duhour, Andrés Esteban (autor) ; van Eekeren, Nick (coaut.) ; Emmerling, Christoph (coaut.) ; Falco, Liliana B. (autora) ; Fernández, Rosa (autora) ; Fonte, Steven J. (coaut.) ; Fragoso González, Carlos Enrique (autor) ; Franco, André L. C. (coaut.) ; Fugère, Martine (coaut.) ; Fusilero, Abegail T. (coaut.) ; Gholami, Shaieste (coaut.) ; Gundale, Michael J. (autor) ; Gutiérrez López, Mónica (autora) ; Hackenberger, Davorka K. (coaut.) ; Hernández, Luis M. (autor) ; Hishi, Takuo (coaut.) ; Holdsworth, Andrew R. (coaut.) ; Holmstrup, Martin (autor) ; Hopfensperger, Kristine (autora) ; Huerta Lwanga, Esperanza (autora) ; Huhta, Veikko (coaut.) ; Hurisso, Tunsisa T. (coaut.) ; Iannone III, Basil V. (coaut.) ; Iordache, Madalina (autora) ; Joschko, Monika (autora) ; Kaneko, Nobuhiro (coaut.) ; Kanianska, Radoslava (coaut.) ; Keith, Aidan M. (coaut.) ; Kelly, Courtland A. (coaut.) ; Kernecker, Maria L. (coaut.) ; Klaminder, Jonatan (autor) ; Koné, Armand W. (autor) ; Kooch, Yahya (coaut.) ; Kukkonen, Sanna T. (coaut.) ; Lalthanzara, H. (coaut.) ; Lammel, Daniel R. (autor) ; Lebedev, Iurii M. (coaut.) ; Li, Yiqing (coaut.) ; Lidon, Juan B. Jesús (autor) ; Lincoln, Noa K. (coaut.) ; Loss, Scott R. (coaut.) ; Marichal, Raphael (autor) ; Matula, Radim (coaut.) ; Moos, Jan Hendrik (autor) ; Moreno, Gerardo (autor) ; Morón Ríos, Alejandro (autor) (1960-) ; Muys, Bart (coaut.) ; Neirynck, Johan (autor) ; Norgrove, Lindsey (coaut.) ; Novo, Marta (autora) ; Nuutinen, Visa (coaut.) ; Nuzzo, Victoria (autora) ; Mujeeb Rahman P. (coaut.) ; Pansu, Johan (autor) ; Paudel, Shishi (coaut.) ; Pérès, Guénola (coaut.) ; Pérez Camacho, Lorenzo (autor) ; Piñeiro, Raúl (autor) ; Ponge, Jean François (autor) ; Rashid, Muhammad Imtiaz (coaut.) ; Rebollo, Salvador (autor) ; Rodeiro Iglesias, Javier (autor) ; Rodríguez, Miguel Ángel (autor) ; Roth, Alexander M. (autor) ; Rousseau, Guillaume X. (coaut.) ; Rozen, Anna (autora) ; Sayad, Ehsa (autora) ; van Schaik, Loes (coaut.) ; Scharenbroch, Bryant C. (coaut.) ; Schirrmann, Michael (autor) ; Schmid, Olaf (coaut.) ; Schröder, Boris (coaut.) ; Seeber, Julia (autora) ; Shashkov, Maxim P. (coaut.) ; Singh, Jaswinder (coaut.) ; Smith, Sandy M. (coaut.) ; Steinwandter, Michael (autor) ; Talavera, José A. (autor) ; Trigo, Dolores (autora) ; Tsukamoto, Jiro (coaut.) ; de Valença, Anne W. (coaut.) ; Vanek, Steven J. (coaut.) ; Virto, Iñigo (autor) ; Wackett, Adrian A. (autor) ; Warren, Matthew W. (coaut.) ; Wehr, Nathaniel H. (coaut.) ; Whalen, Joann K. (coaut.) ; Wironen, Michael B. (coaut.) ; Wolters, Volkmar (coaut.) ; Zenkova, Irina V. (autora) ; Zhang, Weixin (coaut.) ; Cameron, Erin K. (autor) ; Eisenhauer, Nico (autor) ;
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Contenido en: Science Vol. 366, no. 6464 (October 2019), p. 480–485 ISSN: 1095-9203
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Resumen en: Inglés |
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Soil organisms, including earthworms, are a key component of terrestrial ecosystems. However, little is known about their diversity, their distribution, and the threats affecting them. We compiled a global dataset of sampled earthworm communities from 6928 sites in 57 countries as a basis for predicting patterns in earthworm diversity, abundance, and biomass. We found that local species richness and abundance typically peaked at higher latitudes, displaying patterns opposite to those observed in aboveground organisms. However, high species dissimilarity across tropical locations may cause diversity across the entirety of the tropics to be higher than elsewhere. Climate variables were found to be more important in shaping earthworm communities than soil properties or habitat cover. These findings suggest that climate change may have serious implications for earthworm communities and for the functions they provide.


7.
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Parasitic nematodes in Snappers (Perciformes: Lutjanidae) from the Southern Gulf of Mexico and Mexican Caribbean
Hernández Olascoaga, Arturo (autor) ; González Solís, David (autor) ;
Contenido en: Journal of Parasitology Volumen 105, número 5 (October 2019), páginas 697-703 ISSN: 0022-3395
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Snappers from the southern Gulf of Mexico (SGM) and Mexican Caribbean (CAR) were examined for parasitic nematodes to determine their richness, composition, and infection parameters (prevalence and mean intensity). From February 2016 to March 2018, 431 individuals of 8 snapper species were collected in 6 localities. In all, these fishes were parasitized by 2,275 individual nematodes belonging to 13 taxa: Terranova sp. was found in 7 of 8 host species and showed the highest prevalence (23%), while the rest had lower values (<10%). Lutjanus griseus (Linnaeus) harbored the highest species richness (10 species), followed by Lutjanus apodus (Walbaum) (8 species). Most localities were similar in terms of species richness but differed in the specific composition. Eight nematode taxa represent new host records for the family Lutjanidae (Gill), thus increasing to 22 the nematode taxa in the SGM and CAR. There is a potential risk to public health due to the presence of nematodes with zoonotic potential (as Anisakis sp.) and the habit in the region of eating raw fish (cebiche).


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Here, we present the results of a taxonomic survey of the nematodes parasitizing fishes from the lagoon flats of Palmyra Atoll, Eastern Indo-Pacific. We performed quantitative parasitological surveys of 653 individual fish from each of the 44 species using the intertidal sand flats that border the atoll’s lagoon. We provide morphological descriptions, prevalence, and mean intensities of the recovered seven species of adult nematode (Pulchrascaris chiloscyllii, Capillariidae gen. sp., Cucullanus bourdini, Cucullanus oceaniensis, Pseudascarophis sp., Spinitectus (Paraspinitectus) palmyraensis sp. nov., Philometra pellucida) and three larval stages (Pulchrascaris sp., Hysterothylacium sp., Cucullanus sp.). We recorded: Pulchrascaris chiloscyllii from Carcharhinus melanopterus; Capillariidae gen. sp. from Chaetodon lunula, Lutjanus fulvus, and Ellochelon vaigiensis; Cucullanus bourdini from Arothron hispidus; Cucullanus oceaniensis from Abudefduf sordidus; Pseudascarophis sp. from Chaetodon auriga, Chaetodon lunula, and Mulloidichthys flavolineatus; Spinitectus (Paraspinitectus) palmyraensis sp. nov. from Albula glossodonta; Philometra pellucida from Arothron hispidus; and three larval forms, Pulchrascaris sp. from Acanthurus triostegus, Acanthurus xanthopterus, Rhinecanthus aculeatus, Platybelone argalus, Carangoides ferdau, Carangoides orthogrammus, Caranx ignobilis, Caranx melampygus, Caranx papuensis, Chaetodon auriga, Chanos chanos, Amblygobius phalaena, Asterropteryx semipunctata, Valencienea sexguttata,

Kyphosus cinerascens, Lutjanus fulvus, Lutjanus monostigma, Ellochelon vaigiensis, Mulloidichthys flavolineatus, Upeneus taeniopterus, Gymnothorax pictus, Abudefduf septemfasciatus, Abudefduf sordidus, and Stegastes nigricans; Hysterothylacium sp. type MD from Acanthurus triostegus, Carangoides ferdau, Chaetodon lunula, Chanos chanos, Kyphosus cinerascens, Abudefduf sordidus, and Arothron hispidus; and Cucullanus sp. from Caranx ignobilis. Spinitectus (Paraspinitectus) palmyraensis sp. nov. (Cystidicolidae) is described from the intestine of roundjaw bonefish Albula glossodonta. All the nematode species reported in this study represent new geographical records. We discuss how our survey findings compare to other areas of the Indo-Pacific, and the way the relatively numerical dominance of trophically transmitted larval stages likely reflect the intact food web of Palmyra Atoll, which includes a large biomass of large-bodied top predator sharks and ray-finned fishes.


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Redescription of three species of nematodes (Nematoda) parasitising fishes in the USA, with a key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes of North America
Moravec, František (autor) ; de Buron, Isaure (autora) ; González Solís, David (autor) ;
Contenido en: Systematic Parasitology Vol. 96, no. 1 (January 2019), p. 79-94 ISSN: 0165-5752
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Resumen en: Inglés |
Resumen en inglés

Three species of parasitic nematodes are redescribed based on light and scanning electron microscopical (SEM) examinations of newly collected specimens in fishes of South Carolina, USA: Dichelyne (Cucullanellus) bullocki Stromberg & Crites, 1972 from Fundulus heteroclitus (Linnaeus) (Fundulidae); Dichelyne (Dichelyne) diplocaecum Chandler, 1935 from Ictalurus furcatus (Valenciennes) (Ictaluridae); and Hysterothylacium pelagicum Deardorff & Overstreet, 1982 from Coryphaena hippurus Linnaeus (Coryphaenidae). For the first time, intraspecific variations in the number of intestinal caeca were observed in D. bullocki, as well as previously unknown males and gravid females of D. diplocaecum are described; this enabled to synonymise D. mexicanus Caspeta-Mandujano, Moravec & Salgado-Maldonado, 1999 with D. diplocaecum. Unlike most congeneric species, H. pelagicum has no double postanal papillae, as confirmed by SEM. A key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes in North America is provided.


Resumen en español

El proyecto estudió los movimientos de peces entre el mar Caribe (áreas protegidas de Xcalak, México y Bacalar Chico, Belice) y la bahía de Chetumal/Corozal, también un área protegida (Santuario del Manatí), por marcado-recaptura, isótopos estables y parasitología, con énfasis en el macabí (Albula vulpes), un recurso valioso y vulnerable, así como en la palometa (Trachinotus falcatus), pargos (Lutjanus griseus, L. apodus), barracuda (Sphyraena barracuda), pez aguja (Strongylura notata), y otros. Se buscó no sólo una descripción de las migraciones estacionales, sino también cambios entre la situación actual y la de hace una década y media, para la cual se comparó con datos propios previos, tanto en el arrecife de Xcalak como en la bahía de Chetumal, con el fin de estimar los posibles efectos de la apertura de una comunicación directa con el mar a través del canal de Zaragoza. Al cabo de tres años de trabajo y unos 100 días efectivos en el campo, se marcaron cerca de 9000 ejemplares de macabí y palometa y se recuperaron casi 600 marcas, además de analizar isotópicamente más de 100 muestras de tejido. También se realizaron talleres con pescadores en ambos países, tanto para aprender de su conocimiento tradicional, como para colaborar en la recuperación de marcas y compartir los avances. Por último, se examinó también la aproximación de especies exóticas invasoras a la bahía, tanto desde el mar (pez león, Pterois volitans) como desde el río Hondo (pez diablo, Pterygoplichthys pardalis). Los resultados del proyecto, que siguen analizándose, confirman el grado de dependencia mutua de ambos ecosistemas, bahía y mar adyacente, a través de los movimientos de los peces, y se detallan en tesis, artículos y ponencias sobre macabí, barracuda, pargos, pez aguja, pez león, pez diablo, y los cambios de la ictiofauna en general desde 1995 a la fecha.