700 research outputs found
Acanthococcus gracielae Gonzalez & Claps
No full text<i>Acanthococcus gracielae</i> González & Claps <p> <i>Acanthococcus gracielae</i> González & Claps 2011: 267 –268.</p> <p> <b>Material examined.</b> Holotype: Argentina, Salta, Río Colorado (24°48'0″ S, 62°27'0″ W), unknown host, 6/XI/ 1993, M.C.G. Willink col. (IFML). Paratypes: 3 adult females with the same data as the holotype.</p> <p> <b>Additional material examined.</b> Argentina, Tucumán, San Miguel de Tucumán (26° 49′ 0″ S, 65° 13′ 0″ W), on “tatané” <i>Chloroleucon tenuiflorum</i>, -/5/2015, Claps & Moreno col., 2(5); on “churqui” <i>Acacia caven</i>, same date and collector, 2(4) (IFML).</p> <p> <b>Diagnosis</b>. Slide-mounted adult female with abundant dorsal conical setae in transverse lines on abdominal and thoracic segments; symmetrical macrotubular ducts; numerous microtubular ducts of type B on both surfaces; marginal setae undifferentiated from dorsal setae; metacoxa each with approximately 50 pores, 30 on dorsal surface and 20 on ventral surface; anal lobes with 2 ventral setae (González & Claps 2011).</p> <p> <b>Observations.</b> Severe attacks have been noted on urban trees of <i>Chloroleucon tenuiflorum</i> (Fig. 5), an unusual phenomenon among eriococcids in Argentina. Such attacks can damage hosts.</p> <p> <b>Distribution.</b> Argentina, Neotropical region, Chaco subregion, Chaco province.</p>Published as part of <i>González, Patricia, Claps, Lucía E., Juárez, Andrea & Moreno, Diego, 2017, Review of the Eriococcidae (Hemiptera: Coccomorpha) infesting Fabaceae in Argentina, with descriptions of three new species of Acanthococcus Signoret, pp. 41-57 in Zootaxa 4232 (1)</i> on page 50, DOI: 10.11646/zootaxa.4232.1.3, <a href="http://zenodo.org/record/292749">http://zenodo.org/record/292749</a>
Hydrologic Conditions Leading to Debris-Flow Initiation in the Campanian Volcanoclastic soils
No full textCatchment similarity for regional predictions in ungauged basins, EGU General Assembly 2009 - Vienna, Austria, 19-24 April 2009.
No full textSession HS5.10: Catchment similarity for regional predictions in ungauged basins
Convener: E. Toth
Co-Conveners: P. A. Troch , R.A. Woods , P. Claps
This session originates directly from research activities carried out under the PUB initiative [Predictions in Ungauged Basins, an IAHS initiative e.g., external link: http://pub.iwmi.org] and focus on the estimation streamflow-regime indicators (e.g., annual flow, flow-duration curves, floods and low-flows) through regionalization of hydrological information. In particular, the attention is focussed on objective and process-based criteria to be used for catchment classification, spatial interpolation of streamflow indices, identification of hydrologically homogeneous groups of basins. Original contributions are solicited that address the investigation of similarities among catchment characteristics and processes. Four different aspects are of particular importance:
- the role of catchment similarities in the explanation of regional hydrological patterns;
- pooling schemes in the context of hydrologically homogeneous groups of sites;
- analysis of possible common dominant processes as a basis for describing catchment similarity;
- assessment of uncertainty of regional streamflow prediction in ungauged sites.
The session format consists of a standard EGU oral&poster session and an open forum discussion in a splinter meeting room afterwards. The open forum will enable us to further discuss the topic in a friendly and informal atmosphere
Informational entropy of fractal river networks
No full textInformational entropy of river networks, as defined by Fiorentino and Claps (1992), proved to be a useful tool in the interpretation of several properties exhibited by natural networks. In this paper, self-similar properties of river networks are taken as the starting point for investigating analogies and differences between natural networks and geometric fractal trees, comparing their variability entropy with parameters of both classes of networks. Attention is directed particularly to relations between entropy and Horton order and entropy and topological diameter of subnetworks. Comparisons of these relations for fractals and natural networks suggest that network entropy can contribute to clarify important points concerning self-similar properties of river networks. Moreover, the estimation of the fractal dimension of branching for natural networks can be considerably improved using the relation between entropy and Horton order throughout the network
Using rainfall and runoff peaks over threshold in the analysis of flood generation mechanism
No full textAnalisi dei superamenti di soglia per piogge e deflussi giornalieri a supporto dell'analisi regionale delle piene.
No full textAnanlysis of peak over threshold within daily data for flood frequency curve assessment.
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Hydrologic Conditions Leading to Debris-Flow Initiation in the Campanian Volcanoclastic soils
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