In this study we redescribe an ostracod species belonging to the subfamily Cypridopsinae Kaufmann, 1900, sampled in seven localities of northern and southern Patagonia, Argentina. A new taxonomical combination is proposed, Cypridopsis silvestrii comb. nov., based on detailed description females first descriptions males. occurred a wide geographical distribution range, from 40º 48º S latitude, as well broad environmental tolerance ranges. We evaluated morphological variations two populations...

This article explores the potential role of UV radiation (UVR) as an influence on zooplankton communities. In first section we provide a general overview UVR effects freshwater zooplankton, with emphasis Argentine and Chilean environments. second present results survey involving 53 temperate lakes across gradient exposure to determine patterns species richness specific diversity. These community characteristics decreased at high (i.e. mean water column irradiance or low lake optical...

Limnocythere rionegroensis and L. patagonica are among the most widely distributed ostracod species in Patagonia, Argentina, frequently used as proxies paleoenvironmental reconstructions. However, taxonomic clarification was needed due to lack of detailed morphological descriptions. In this study, we provide first description anatomy soft parts patagonica. Additionally, our findings emphasize importance examining female genitalia for identification. We also assess intra- interspecific...

In the present study, we compare modern and Quaternary ostracods from two lacustrine basins: Laguna Cari-Laufquen (41°S) Lago Cardiel (49°S) in Patagonia. Taxonomic quantitative analyses along with isotopic chemical studies of extant ostracod fauna indicate that distinct associations can be identified as a function conductivity. Three distinguished: (1) springs, ponds small creeks, characterized by low conductivity (e.g. 1015 µs cm−1); (2) lakes permanent ponds, medium 1625 cm−1) (3)...

ABSTRACT In this paper we present the results of research on occurrence, induction and role photoprotective compounds (PPCs) in native aquatic yeasts from freshwater Patagonian ecosystems. We focus effect UV radiation (UVR) as a factor that controls level photoprotection yeasts, explore its potential significance shaping yeast distributional patterns. The presented here combines field surveys laboratory work, including isolation culture strains, assays under different conditions. obtained...

Photoprotective compounds (PPCs), such as carotenoids and mycosporine-like amino acids (MAAs), confer photoprotection to aquatic organisms against harmful ultraviolet-B (UVB) radiation. The natural variability of these in zooplankton has been related temperature, radiation diet, but the ultimate mechanisms regulating observed patterns field are still unclear. In this study, we analysed MAAs a population calanoid copepod Boeckella antiqua shallow pond located Northern Patagonia (Argentina)....

Ostracods are microcrustaceans with a calcareous carapace, very useful as paleoenvironmental indicators. Eucypris fontana (Graf, 1931) is non-marine ostracod species, distributed in southern Neotropics, commonly found living bisexual populations well quaternary sequences Patagonia. Geometry morphometric analysis offers efficient and powerful techniques to quantify, describe analyze shape size variations. In this study, phenotypic changes the carapace (size shape) of E. were analyzed using...

Abstract The limnological conditions during the past 700 yr were reconstructed based on multiproxy analysis of a short sedimentary sequence from El Toro Lake (~40°S, 70°W). Mineralogical and geochemical features, as well ostracods chironomids, record hydrologic changes in basin. ostracod Limnocythere rionegroensis var. 1, reliable indicator high salinity, Eucypris fontana , euryhaline species with preferences for moderate-salinity waters, are studied paleolimnological proxies. chironomid...

AbstractWetlands are one of the most valuable natural resources, providing a number ecosystem services and socio-economic values. Small ponds sustain rich aquatic biodiversity because their short hydrological regimen small size excellent environments for population studies microcrustaceans such as ostracods. This study describes dynamics Ostracoda fauna in three temporary shallow lakes during hydroperiod Argentine Patagonia. Three cosmopolitan species were determined: Cypris pubera,...

According to an updated list of extant non-marine ostracods, there are 2,330 subjective species in 270 genera the world, which 333 known from Neotropical region. However, knowledge about ostracod fauna Argentina is scarce, fragmented and incomplete. Thus, aim this study was present first checklist recent ostracods Argentina, including geographical distributions ecological characteristics species. Thus far, 66 33 7 families have been recorded Argentinian environments. Of total number species,...

Abstract Mycosporine‐like amino acids (MAAs) are ubiquitous photoprotective compounds in aquatic environments. MAAs synthesized by a wide variety of organisms ( i.e. bacteria, fungi and algae) their production is photoinducible ultraviolet radiation (UVR) (280–400 nm) and/or photosynthetically active (400–750 nm). Most animals however, unable to synthesize must acquire these through diet or from symbiotic organisms. In this paper, we investigate the possible sources factors (temperature...

Summary 1. Mycosporine‐like amino acids (MAAs) are ubiquitous compounds in aquatic organisms that usually considered sunscreens protect them from harmful ultraviolet radiation. Given virtually all animals lack the metabolic pathways to synthesise MAAs de novo , they must acquire either their diet or microorganisms living close association. In freshwater copepods, accumulation of is stimulated by exposure and/or visible 2. A 2 × factorial experiment was performed assess contributions dietary...

Two species of ostracods new to Patagonia, Argentina, are described. One them, Riocypris whatleyi sp. nov., is described for the first time, and second, sarsi (Daday, 1902) comb. reallocated from genus Eucypris Riocypris. Inter- intra-specific variations in shape, size, sexual dimorphism were evaluated based on geometric morphometric analysis. Moreover, morphological comparative analyses applied re-examine living quaternary specimens recovered previous studies. Based these results, a generic...

In order to characterize Patagonian (Argentina) ecoregions using non-marine ostracods, their associations in 69 environments were assessed. Twenty eight taxa recorded, including 12 endemic of the Neotropical region. Our results indicate that ostracods are mainly influenced by electrical conductivity (EC), altitude, pH, and temperature; shows a correlation with Argentinian ecoregions. Assemblage I is composed sites located at high altitude Andean forest ecoregion. Host waters have low...

South American paleoreconstructions are of global interest because it is the only landmass extending from tropics to southern high latitudes and intersecting entire westerly wind belt. In this context, endorheic environments, as Lake Cari-Laufquen Grande (LCLG; 41º35’S, 69º25’W) excellent sites for paleoenvironmental studies, since they react rapidly changes in precipitation/evaporation ratio. study, limnological conditions prevailing during last 3000 years have been inferred based on a...

Geometric morphometric methods are powerful tools to discriminate between closely related ostracods taxa as well study the relationship their morphological variations, taxonomy and paleoecology. In this study, valve outline analysis allows discrimination non-marine ostracod C. silvestrii R. whatleyi juveniles, pointing out differences in posterior area surface ornamentation. Modern female specimens of from 23 sites located a spatial transect (41 51 °S) exhibited extensive variability, on...

ABSTRACT Our understanding of elaborate signaling behaviors, such as bird song, has been hindered by historical biases towards male animals. Bird song shown to serve important functions like defending territories or attracting mates in both males and females, singing sexes is likely the ancestral trait for songbirds. Female strongly associated with year‐round territory defense, especially tropics. However, more studies female songs are needed better understand selection pressures acting on...