Metaecosystem dynamics drive community composition in experimental, multi‐layered spatial networks

Cross‐ecosystem subsidies are studied with a focus on resource exchange at local ecosystem boundaries. This perspective ignores regional dynamics that can emerge via constraints imposed by the landscape, potentially leading to spatially‐dependent effects of subsidies and spatial feedbacks. Using miniaturized landscape analogues of river dendritic and terrestrial lattice spatial networks, we manipulated and studied resource exchange between the two whole networks. We found community composition in dendritic networks depended on the resource pulse from the lattice network, with the strength of this effect declining in larger downstream patches. In turn, this spatially‐dependent effect imposed constraints on the lattice network with populations in that network reaching higher densities when connected to more central patches in the dendritic network. Consequently, localized cross‐ecosystem fluxes, and their respective effects on recipient ecosystems, must be studied in a perspective taking into account the explicit spatial configuration of the landscape

Pinpointing the Dominant Component of Contact Resistance to Atomically Thin Semiconductors

Achieving good electrical contacts is one of the major challenges in realizing devices based on atomically thin two-dimensional (2D) semiconductors. Several studies have examined this hurdle, but a universal understanding of the contact resistance and an underlying approach to its reduction are currently lacking. In this work we expose the shortcomings of the classical contact resistance model in describing contacts to 2D materials, and offer a correction based on the addition of a lateral pseudo-junction resistance component (Rjun). We use a combination of unique contact resistance measurements to experimentally characterize Rjun for Ni contacts to monolayer MoS2. We find that Rjun is the dominating component of the contact resistance in undoped 2D devices and show that it is responsible for most of the back-gate bias and temperature dependence. Our corrected model and experimental results help understand the underlying physics of state-of-the-art contact engineering approaches in the context of minimizing Rjun

A new species of pachomius Peckham & Peckham (araneae: salticidae), inhabiting a river-bank of northern argentina

De acuerdo con su naturaleza, los ambientes riparios están representados en áreas reducidas; son vulnerables a las bajantes de agua y a las represas. Este documento describe e ilustra una nueva especie de araña saltarina, Pachomius palustris sp. nov., habitante de las plantas palustres sobre bancos del Río Paraná en el lado argentino. La nueva especie fue ubicada dentro del grupo dybowskii porque la hembra tiene el borde posterior de las aberturas copulatorias del epigino extendidas y el macho carece de apófisis subterminal lateral. Pachomius palustris sp. nov. se distingue de otras especies del grupo por tener un émbolo más fino y largo con la punta ligeramente curvada y las aberturas copulatorias con los bordes semi espiralados. También se discute una hipótesis sobre su probable distribución reducida.According to their nature, riparian environments are represented in reduced areas; they are vulnerable to water downspouts and dams. This paper describes and illustrates a new species of jumping spider, Pachomius palustris sp. nov., an inhabitant of the riparian vegetation from the Paraná River banks, in the Argentinian side. The new species was placed into the dybowskii group because the female has the posterior edge of epigynal copulatory openings extended and the male lacks the lateral subterminal apophysis. Pachomius palustris sp. nov. is distinguished from other species of this group by having a thinner and longer embolus with a slightly curved tip and copulatory openings with semi-spiral edges. A hypothesis about its probable reduced distribution is also discussed.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Baigorria, Julián Emanuel Martín. Universidad Maimónides. Centro de Ciencias Naturales, Ambientales y Antropológicas; Argentina. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentin

Unveiling some unknown jumping spiders (Araneae: Salticidae) from Argentina: descriptions of seven new species

We present a taxonomic study with descriptions of the following seven new species from Argentina: Ceriomura intaca sp. nov. (mmff) from Misiones; C. lacinia sp. nov. (mmff) from Misiones; Thiodina tefyta sp. nov. (mmff) from Salta, Tucumán and Córdoba; Lumptibiella demagistrisi sp. nov. (mmff) from Buenos Aires; Zygoballus chekokue sp. nov. (mmff) from Misiones and Corrientes; Akela scaloneta sp. nov. (mmff) from Misiones; and Philira toroi sp. nov. (mmff) from Jujuy. The misassignment of the paratype of C. damborskyae is resolved.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentin

Unveiling some unknown jumping spiders (Araneae: Salticidae) from Argentina: descriptions of seven new species

We present a taxonomic study with descriptions of the following seven new species from Argentina: Ceriomura intaca sp. nov. (mmff) from Misiones; C. lacinia sp. nov. (mmff) from Misiones; Thiodina tefyta sp. nov. (mmff) from Salta, Tucumán and Córdoba; Lumptibiella demagistrisi sp. nov. (mmff) from Buenos Aires; Zygoballus chekokue sp. nov. (mmff) from Misiones and Corrientes; Akela scaloneta sp. nov. (mmff) from Misiones; and Philira toroi sp. nov. (mmff) from Jujuy. The misassignment of the paratype of C. damborskyae is resolved.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentin

Pachomius areteguazu sp. nov. (araneae: salticidae: freyina), and the first description of the epigynum of a member of the nigrus group

Our latest collections in northeastern Argentina include new species of jumping spiders (Salticidae) that indicate that the diversity of this group in Argentina is indeed underestimated. This paper describes and illustrates a new species, Pachomius areteguazu sp. nov., an inhabitant of the grasslands of northeastern Argentina. Within the genus Pachomius, this new species is placed in the nigrus group (Edwards 2015) because it has a sclerotized lateral subterminal apophysis (LSA) next to the embolus, spine-shaped, possibly derived by loss of the membranous part of the LSA. Previously no females in the nigrus group were known, so we also present the first description of an epigynum for this group and discuss its relationship to the LSA with respect to copulation.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; ArgentinaFil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; Argentin

Two new genera and four new species of jumping spiders (Araneae: Salticidae: Dendryphantini)

The new genera Ahijuna gen. n. and Lumptibiella gen. n. (Araneae, Salticidae) including four new species, A. patoruzito sp. n., L. camporum sp. n., L. chacoensis sp. n. and L. paranensis sp. n., are described from specimens recently discovered in areas endangered by wildfires in Argentina. The species of these new genera share the typical structure of the genitalia with many Dendryphantini Menge. However, the combination of a distinct atrium on the anterior half of epigynal field for both genera, a small body size, flattened carapace shape, and a distinctive dorsal coloration pattern in the case of Ahijuna gen. n., and the possession of a lump-shaped process on the middle of the male tibia retrolateral side in the case of Lumptibiella gen. n., are not found in other Neotropical dendryphantine. Available ecological data suggests that most of these species inhabit grasslands. Full colored photographs are provided.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentin

Notes on the jumping spider Corythalia conferta (Araneae: Salticidae), a possible myrmecophagous specialist in Argentina

We present data from a new study of Corythalia conferta Bayer, Höfer & Metzner, a recently described species that inhabits southern South America. A distribution update, morphological illustrations, and phylogeny of related Corythalia C. L. Koch species are presented. Also, we present data that suggest that this species may be the first Corythalia known to specialize in hunting ants (Formicidae). We describe its hunting behavior and habitat. During a 300 hour field study, we recorded 86 prey items, 98.8% of which were ants of 11 different species.Fil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Rubio, Gonzalo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul. Agencia de Extension Rural Apostoles; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul. Agencia de Extension Rural Apostoles; ArgentinaFil: Oklander, Luciana Inés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; Argentina. Fundación de Historia Natural Félix de Azara; Argentin

The jumping spider tapsatella albocastanea, a new genus and species from Argentina (araneae: salticidae: freyina)

Tapsatella albocastanea, new genus and species (Araneae, Salticidae) is described from specimens recently collected in a quebrachal forest in Chaco Province, Argentina. The dorsal stripes, shape of the tegulum, presence of small spherical spermathecae and shape of the external epigynum suggest that this species is a relative of some Wedoquella and Phiale. It differs from both of these genera by the presence of a peculiar border between tegulum divisions, a different structure and arrangement of copulatory ducts, and an elongate, depressed, and much narrower carapace.Fil: Rubio, Gonzalo Daniel. Instituto Nacional de Tecnología Agropecuaria; Argentina. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Stolar, Cristian Eric. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Misiones. Estacion Experimental Agropecuaria Cerro Azul.; ArgentinaFil: Nadal, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura; ArgentinaFil: Baigorria, Julián Emanuel Martín. Fundación de Historia Natural Félix de Azara; Argentin