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Montevideo, Uruguay

Laufer G.,Area Biodiversidad y Conservacion | Vaira M.,National University of Jujuy | Pereyra L.C.,National University of Jujuy | Akmentins M.S.,National University of Jujuy
Studies on Neotropical Fauna and Environment | Year: 2015

Amphibians detect quality signals when selecting reproduction sites. We hypothesize that Melanophryniscus rubriventris, an explosive breeding toad that reproduces in small, ephemeral water bodies, is able to select sites without predators. We performed a field experiment simulating oviposition sites, two with predators (tadpoles and bugs) and one control. Contrary to our expectations, we obtained no differences in the number of eggs deposited. We also performed an experiment to test the capability of M. rubriventris tadpoles to detect potential predators. Tadpoles could not detect predators, as other species did. Melanophryniscus rubriventris is selecting spawning sites following other signals, not predation risk. Identifying selection cues is crucial to protect species that depend on threatened habitats. © 2015 Taylor & Francis. Source


Lezama C.,Biodiversidad y Conservacion | Carranza A.,University of the Republic of Uruguay | Fallabrino A.,Biodiversidad y Conservacion | Estrades A.,Biodiversidad y Conservacion | And 2 more authors.
Biological Invasions | Year: 2013

Here we report the first observations of the rapa whelk Rapana venosa massively bio-fouling immature green turtles Chelonia mydas. From November 2004 to July 2011, we examined 33 green turtles with rapa whelks attached to their carapaces in Uruguayan waters. The number of attached rapa whelks ranged from 1 to 49 individuals, representing up to 20 % of turtle weight. This previously unrecorded interaction may be of global importance to green turtles conservation because (a) immature green turtles from distant breeding populations utilize insular and coastal waters of the Río de la Plata estuary and Atlantic coast of Uruguay as developmental and foraging habitats and (b) attached whelks may reduce green turtle fitness by reducing buoyancy, increasing drag, and causing severe injuries to the carapace. © 2012 Springer Science+Business Media B.V. Source


Velez-Rubio G.M.,University of Valencia | Tomas J.,University of Valencia | Miguez-Lozano R.,University of Valencia | Xavier J.C.,University of Coimbra | And 4 more authors.
Marine Biodiversity | Year: 2014

A total of 52 cephalopod beaks were found in the stomachs and intestines of 17 out of 54 green turtles, Chelonia mydas, stranded on the Uruguayan coast between 2009 and 2013 (frequency of occurrence = 31.5 %). Upper and lower beaks were assigned to at least six Oegopsid species of four different genera, Chiroteuthis, Histioteuthis, Onykia (= Moroteuthis) and Mastigoteuthis. Although the presence of cephalopods in the diet of green turtles has been reported previously, it has been quoted as a sporadic or less important diet category. Our findings suggest that this intake of cephalopods by juvenile green turtles during their oceanic stages may be more common in the Southwestern Atlantic Ocean waters than previously thought. According to our records, two of the six Oegopsid squid species found would have a more extended distribution than previously reported, ranging from circumpolar sub-Antarctic areas to the Brazil-Malvinas confluence zone. We highlight the potential of diet analysis of pelagic predators as a tool to enhance our knowledge of the diversity and distribution of poorly known cephalopod species. © 2014 Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg. Source


Pereyra L.C.,National University of Jujuy | Pereyra L.C.,National University of Salta | Akmentins M.S.,National University of Jujuy | Akmentins M.S.,National University of Salta | And 3 more authors.
Zootaxa | Year: 2013

Elachistocleis haroi sp. nov. is described from El Algarrobal, Jujuy province, north-western Argentina. The new species is diagnosed by the dorsal pattern of mid-longitudinal bright yellow stripe from the intraocular zone, surpassing the postcephalic transverse skin fold, to vent; dorsum grayish brown mottled with a paravertebral symmetric pattern of dark spots resembling a pine tree; and a thin regular yellow line on the posterior surface of the thighs and tibiae. The advertisement call is a long trill with an average duration of 3.18 seconds, multipulsed with a mean dominant frequency of 4.56 kHz. The tadpole is characterized by the oral dermal flaps with papillae-like edges. Copyright © 2013 Magnolia Press. Source

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