4 results on '"Quintana, Silvina"'
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2. Aspects of the natural history of Phrynus barbadensis (Pocock, 1893) (Amblypygi: Phrynidae)
- Author
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QUINTANA, Silvina
- Subjects
Ecología. Heterophrynus. Necrofagia. Scytodes. Sudamérica ,Ecology.Heterophrynus. Necrophagy.Scytodes. South America - Abstract
Information on preys and predators of the amblypygids is scarce, largely disperse and sometimes overlooked by the arachnologist. Phrynus barbadensis is a Neotropical whip spider widely distributed, but its natural history is poorly known. The main purpose of this contribution deals with preys, predators, reproductive effort and microhabitat preferences of P. barbadensis in a Colombian locality. Field work was carried out by two researchers during four expeditions of six days each, between June and November 2017. Two observed cases of intragremial predation concerned to the spitting spider Scytodes longipes Lucas (Araneae: Scytodidae) and the giant whip spider Heterophrynus caribensis Armas, Torres-Contreras & Álvarez (Phrynidae: Heterophryninae). A new case of a mollusk as prey of whip spiders is also recorded. The number of embryos per batch in P. barbadensis was 14-79 (n = 27, mean = 40, standard error = 3.83), having a positive correlation with the female size. This species was highly associated to fallen trunks and rocks, but poorly to the litter and rocky walls (χ² = 16.26, P < 0.001); with respect to the substrate temperature, it showed a positive association. The cannibalism and necrophagy among the whip spiders are briefy commented, and updated lists of the known preys and predators of the amblypygids are also provided. La información sobre las presas y los depredadores de los amblipígidos es escasa, en gran parte dispersa y, a veces, olvidada por el aracnólogo. Phrynus barbadensis es una araña látigo neotropical ampliamente distribuida, pero su historia natural es poco conocida. El objetivo principal de esta contribución se refere a las presas, los depredadores, el esfuerzo reproductivo y las preferencias de microhábitats de P. barbadensis en una localidad colombiana. Dos investigadores llevaron a cabo el trabajo de campo durante cuatro expediciones de seis días cada una, entre junio y noviembre de 2017. Dos casos observados de depredación intragremial se relacionaron con la araña Scytodes longipes Lucas (Araneae: Scytodidae) y la araña látigo gigante Heterophrynus caribensis Armas, Torres-Contreras & Álvarez (Phrynidae: Heterophryninae). También se registra un nuevo caso de un molusco como presa de las arañas látigo. El número de embriones por lote en P. barbadensis fue 14-79 (n = 27, promedio = 40, error estándar = 3,83), teniendo una correlación positiva con el tamaño de la hembra. Esta especie estuvo altamente asociada a troncos caídos y rocas, pero pobremente a la hojarasca y las paredes rocosas (χ² = 16,26; P < 0,001); con respecto a la temperatura del sustrato, mostró una asociación positiva. El canibalismo y la necrofagia entre las arañas látigo son brevemente comentadas, y también se proporcionan listas actualizadas de las presas y depredadores conocidos de los amblipígidos.
- Published
- 2019
3. Diversity and functional groups of arthropods in greenhouse crop of Chrysanthemum morifolium Ramat. (Asterales: Asteraceae) from Jujuy, Argentina
- Author
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QUINTANA, Silvina
- Subjects
Arachnida. Crisantemo. Insecta. Interacciones. Riqueza ,Arachnida. Chrysanthemum. Insecta. Interactions. Richness - Abstract
Se analizó la diversidad de artrópodos presentes en Chrysanthemum morifolium Ramat. de color amarillo y blanco cultivado en invernadero, en función de la riqueza de especies, abundancia y roles tróficos. El estudio se realizó en un invernadero ubicado en El Carmen (Jujuy). Los muestreos consistieron en tres golpes por planta a 30 plantas tomadas al azar, con dos repeticiones, y un muestreo específico de extracción de cinco flores en tres estados de apertura (botón floral, semiabierta y abierta) para cada color a lo largo del ciclo del cultivo. Las muestras se observaron bajo microscopio estereoscópico para la extracción de los artrópodos asociados, los que fueron identificados y conservados en frascos con etanol 70% o bien como preparaciones microscópicas. Se recolectaron 9.027 artrópodos, distribuidos en las clases Insecta (ocho órdenes y 25 familias) y Arachnida (tres órdenes y nueve familias). El grupo funcional más diverso fue el de fitófagos, siendo las especies dominantes Frankliniella occidentalis (Thysanoptera) y Tetranychus urticae (Prostigamata). Entre los entomófagos se registraron representantes de las familias Anthocoridae (Hemiptera), Chrysopidae (Neuroptera), Phytoseiidae (Mesostigmata), 11 familias de Hymenoptera parasítica, y siete familias de Araneae. Los grupos menos abundantes fueron los detritívoros (Psocoptera), fungívoros (Latridiidae), xilófagos (Bostrichidae) y de alimentación variada (Formicidae). The diversity of arthropods present in the crops of yellow and white Chrysanthemum morifolium Ramat. in greenhouse is analyzed, based on the species richness, abundance and trophic roles. The study was carried out in a greenhouse located in El Carmen (Jujuy). Field tasks consisted of three strokes per plant to 30 plants taken randomly, with two repetitions, and a specific sampling of extraction of five flowers in three opening states (floral bud, flower-semi-open and open flower) for each color throughout the crop cycle. Samples were observed under a stereoscopic microscope for the extraction of the associated arthropods, which were identified and stored in flasks with 70% ethanol as well as microscopy slides. A total of 9,027 arthropods were collected, distributed in the classes Insecta (eight orders and 25 families) and Arachnida (three orders and nine families). The most diverse functional group was the phytophagous. This included the dominant species Frankliniella occidentalis (Thysanoptera) and Tetranychus urticae (Prostigmata). The entomophagous group was represented by Anthocoridae (Hemiptera), Chrysopidae (Neuroptera) and 11 families of Hymenoptera parasitica, Phytoseiidae (Mesostigmata) and seven families of Araneae. The less abundant groups were the detritivores (Psocoptera), fungivores (Latridiidae), xylophagous (Bostrichidae), and the varied diet (Formicidae).
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- 2019
4. Up-regulated pathways in response to Deformed Wing Virus infection in Apis mellifera (Hymenoptera: Apidae).
- Author
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QUINTANA, Silvina, BRASESCO, Constanza, NEGRI, Pedro, MARIN, Maia, PAGNUCO, Inti, SZAWARSKI, Nicolás, REYNALDI, Francisco, LARSEN, Alejandra, EGUARAS, Martín, and MAGGI, Matías
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HONEYBEES , *IMMUNE system , *IMMUNOGENETICS , *VIRAL load , *INSECT virus diseases , *INSECT viruses - Abstract
Transmission of viruses by Varroa destructor Anderson & Trueman to bees has been identified as one of the main threats to Apis mellifera L. colonies. It has also been suggested that synergistic parasite-pathogen interaction mediated by A. mellifera immunity can drive the collapse of honey bee colonies. We analyzed the relationship between deformed wing virus (DWV) viral load and gene expression levels of Toll Wheeler, cactus, domeless, TEPA, nitric oxide synthase, hymenoptaecin, vitellogenin, defensin, abaecin in winter bee samples of A. mellifera with and without deformed wings. Samples were collected from hives in the field with high V. destructor infestation. In bees with deformed wings we found an increase in DWV titre and upregulation of genes in the Jak-STAT signalling pathway. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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