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E A Vallania - One of the best experts on this subject based on the ideXlab platform.
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habitos alimenticios de larvas de Polycentropus joergenseni ulmer 1909 trichoptera polycentropodidae en el rio grande san luis argentina
Gayana, 2006Co-Authors: P A Garelis, E A VallaniaAbstract:El estudio de los habitos alimenticios de insectos acuaticos en arroyos de bajo orden en Argentina es escaso y fragmentario. Los objetivos de este trabajo fueron determinar el habito alimentario de estadios larvales de Polycentropus joergenseni mediante el analisis del contenido estomacal y establecer diferencias entre los periodos de aguas altas y bajas en el Rio Grande. Se colectaron 51 larvas con red Surber de 0,09 m2 y 300 mm de apertura de malla. El material entomologico fue fijado con formalina al 4 % y alcohol al 70 %. El contenido estomacal fue analizado bajo microscopio con aumento de 625 X. Se reconocieron once categorias alimenticias y se calculo el porcentaje de cada uno. El analisis de la dieta no mostro diferencia significativa entre aguas altas y bajas (Test de Mann Whitney, p > 0,05). La dieta estuvo constituida principalmente por el material amorfo, los restos de invertebrados, la materia inorganica y las algas unicelulares. El genero Polycentropus fue asignado dentro de los Grupos Funcionales Alimenticios como: predador, colector filtrador y desmenuzador. Por primera vez se describe a P. joergenseni principalmente como colector filtrador para un rio neotropical de zona semiarida.
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habitos alimenticios de larvas de Polycentropus joergenseni ulmer 1909 trichoptera polycentropodidae en el rio grande san luis argentina feeding habits of Polycentropus joergenseni ulmer 1909 trichoptera polycentropodidae larvae in the grande river s
2006Co-Authors: E A VallaniaAbstract:The knowledge of the feeding habits of aquatic insects that inhabit small streams in Argentine is poor. The aims of this study has been the determination of feeding habits of Policentropus joergenseni by the analysis of larvae gut contents and differentiate between the high and low water period in Rio Grande. We found 51 larvae with Surber sampler of 0,09 m 2 and 300 mm mesh size. The entomological material was fixed with 4 % formol and preserved in 70 % ethanol. Gut contents were analyzed under microscope at 625 X. There were identified eleven categories of feeding items and the percentage of each one was calculated. There were not significant differences between the two periods (Mann Whitney Test, p > 0,05). Diet was composed mainly by amorphous matter, invertebrate remains, inorganic matter and unicellular algae. The genera Polycentropus was classified inside the Functional Feeding Groups as: predator, collector filtered and shredder. This is the first time that P. joergenseni is mainly found as a filterer for a Neotropical river in a semiarid zone.
Helen R Wilcock - One of the best experts on this subject based on the ideXlab platform.
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Landscape, habitat characteristics and the genetic population structure of two caddisflies
Freshwater Biology, 2007Co-Authors: Helen R Wilcock, Michael William Bruford, Richard A. Nichols, Alan G. HildrewAbstract:Summary 1. In a region of south-eastern England, we investigated the hierarchical genetic structure of populations of two stream-dwelling caddisflies (Trichoptera: Polycentropodidae) with contrasting distributions: Plectrocnemia conspersa inhabits numerous small, patchily distributed seeps and streams, while the confamilial Polycentropus flavomaculatus is found in fewer but larger streams and rivers. We also contrasted the genetic structure of P. conspersa in the lowland south-east with that in an upland region in the north west. 2. Microsatellite genotypes were obtained from samples of both species taken from a ‘core area’ and at sites 15, 40 and 100 km from this core (two regions for P. conspersa, totalling 45 sites and 1405 larvae; one region for P. flavomaculatus, totalling 10 sites and 269 larvae). 3. The genetic structure of P. conspersa differed in the two regions. In the upland north-west, significant genetic differentiation was observed at a spatial scale of around 40 km from the core, while there was no structure in the lowland south-east up to around 100 km. Areas of high altitude did not appear directly to reduce gene flow, whereas other potential landscape barriers, including particular geological formations, large urban areas and the sea had a pronounced effect. 4. Weak genetic differentiation in P. conspersa across large distances, particularly in the lowland south-east, suggests that it disperses strongly, facilitating gene flow within and between catchments. Conversely, for P. flavomaculatus we found strong genetic differentiation between almost all sites, suggesting that dispersal is much more limited. 5. Greater dispersal in the patchily distributed P. conspersa than in P. flavomaculatus, which occupies larger and presumably more persistent habitats, could be a general feature of other similarly distributed aquatic insects. While higher relief is potentially a partial barrier to dispersal, P. conspersamust have effective gene flow through such apparently inhospitable terrain, perhaps attributable to dispersal between neighbouring small and ephemeral populations. Indeed, its exploitation of headwaters and seeps requires the ability to disperse between such sites. Apparently it cannot, however, overcome more continuous barriers, consisting of large tracts of landscape with few habitable larval sites. Such landscapes, including those created by humans, may have a stronger effect on population connectivity and colonization in the longer term.
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isolation of polymorphic microsatellite loci in the net spinning caddisfly Polycentropus flavomaculatus polycentropodidae
Molecular Ecology Notes, 2002Co-Authors: Deborah A Dawson, Helen R WilcockAbstract:We have isolated eight polymorphic loci for the caddisfly, Polycentropus flavomaculatus. The application of these markers will allow us to define the genetic population structure of this species and, with complementary ecological work, will enable quantification of its dispersal ability and colonization potential.
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Isolation of polymorphic microsatellite loci in the net‐spinning caddisfly, Polycentropus flavomaculatus (Polycentropodidae)
Molecular Ecology Notes, 2002Co-Authors: Deborah A Dawson, Helen R WilcockAbstract:We have isolated eight polymorphic loci for the caddisfly, Polycentropus flavomaculatus. The application of these markers will allow us to define the genetic population structure of this species and, with complementary ecological work, will enable quantification of its dispersal ability and colonization potential.
Gorazd Urbanic - One of the best experts on this subject based on the ideXlab platform.
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description of the larva of Polycentropus schmidi novak botosaneanu 1965 trichoptera polycentropodidae with some notes on its ecology
Aquatic Insects, 2006Co-Authors: Gorazd UrbanicAbstract:Abstract This paper presents the description of the hitherto unknown larva of Polycentropus schmidi Novak & Botosaneanu, 1965. Information on the morphological identification of this species is given, and the most important diagnostic features are illustrated. A synoptic determination key for all known Central European larvae of Polycentropus is presented. Some notes on the species' distribution in Europe as well as on habitat characteristics are included.
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Description of the larva of Polycentropus schmidi Novak & Botosaneanu, 1965 (Trichoptera: Polycentropodidae) with some notes on its ecology
Aquatic Insects, 2006Co-Authors: Gorazd UrbanicAbstract:Abstract This paper presents the description of the hitherto unknown larva of Polycentropus schmidi Novak & Botosaneanu, 1965. Information on the morphological identification of this species is given, and the most important diagnostic features are illustrated. A synoptic determination key for all known Central European larvae of Polycentropus is presented. Some notes on the species' distribution in Europe as well as on habitat characteristics are included.
P A Garelis - One of the best experts on this subject based on the ideXlab platform.
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habitos alimenticios de larvas de Polycentropus joergenseni ulmer 1909 trichoptera polycentropodidae en el rio grande san luis argentina
Gayana, 2006Co-Authors: P A Garelis, E A VallaniaAbstract:El estudio de los habitos alimenticios de insectos acuaticos en arroyos de bajo orden en Argentina es escaso y fragmentario. Los objetivos de este trabajo fueron determinar el habito alimentario de estadios larvales de Polycentropus joergenseni mediante el analisis del contenido estomacal y establecer diferencias entre los periodos de aguas altas y bajas en el Rio Grande. Se colectaron 51 larvas con red Surber de 0,09 m2 y 300 mm de apertura de malla. El material entomologico fue fijado con formalina al 4 % y alcohol al 70 %. El contenido estomacal fue analizado bajo microscopio con aumento de 625 X. Se reconocieron once categorias alimenticias y se calculo el porcentaje de cada uno. El analisis de la dieta no mostro diferencia significativa entre aguas altas y bajas (Test de Mann Whitney, p > 0,05). La dieta estuvo constituida principalmente por el material amorfo, los restos de invertebrados, la materia inorganica y las algas unicelulares. El genero Polycentropus fue asignado dentro de los Grupos Funcionales Alimenticios como: predador, colector filtrador y desmenuzador. Por primera vez se describe a P. joergenseni principalmente como colector filtrador para un rio neotropical de zona semiarida.
Deborah A Dawson - One of the best experts on this subject based on the ideXlab platform.
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isolation of polymorphic microsatellite loci in the net spinning caddisfly Polycentropus flavomaculatus polycentropodidae
Molecular Ecology Notes, 2002Co-Authors: Deborah A Dawson, Helen R WilcockAbstract:We have isolated eight polymorphic loci for the caddisfly, Polycentropus flavomaculatus. The application of these markers will allow us to define the genetic population structure of this species and, with complementary ecological work, will enable quantification of its dispersal ability and colonization potential.
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Isolation of polymorphic microsatellite loci in the net‐spinning caddisfly, Polycentropus flavomaculatus (Polycentropodidae)
Molecular Ecology Notes, 2002Co-Authors: Deborah A Dawson, Helen R WilcockAbstract:We have isolated eight polymorphic loci for the caddisfly, Polycentropus flavomaculatus. The application of these markers will allow us to define the genetic population structure of this species and, with complementary ecological work, will enable quantification of its dispersal ability and colonization potential.
