Agustín Bassó

Universidad Nacional del Litoral | UNL · Faculty of Biochemistry and Biological Sciences FBCB

OBJETIVOS Evaluar a corto plazo (24-196 h, CP) y mediano plazo (3-4 meses, MP) los efectos de los incendios sobre el suelo, vegetación y fauna de tetrápodos en 17 humedales distribuidos en el río Paraná Medio (Jul.-Set. 2020). Vincular datos de campo y análisis espectrales (severidad normalizada-dNBR e índice de vegetación normalizada-NDVI) con i...

Manual de técnicas y protocolos para el relevamiento y estudio de anfibios de Argentina L a u r a P e r e y r a E d u a r d o E t c h e p a r e M a r c o s V a i r a E d i t o r e s 2021

Tadpoles detect chemical signals released from predators and conspecifics, and those present in the environment, and adjust their behavioral responses. This study evaluated the swimming activity of Rhinella dorbignyi (Duméril and Bibron, 1941) tadpoles exposed to chemical signals, including cues from a predator fish Synbranchus marmoratus Bloch, 19...

In September 2005, the IUCN Species Survival Commission (SSC) held a summit for the conservation of amphibians where specialists from around the world agreed that, in addition to the need to document the declines and extinctions, we need to promote action strategies designed to respond to the global biodiversity crisis. The outcome of this summit w...

Odontoprynus americanus tadpoles were used to determine the safety concentration of pyriproxyfen (PPF) insecticide by acute and sublethal toxicity tests (nominal range tested 0.01 to 10 [± 15%] PPF mg/L). Median lethal concentration (LC50) and no, and lowest-observed-effect concentrations (NOEC and LOEC, respectively) were calculated. We also asses...

Objective The ecotoxic effects of pesticide used for mosquito’s control TRISADA® (TRI) [deltamethrin (D) 1%+tetramethrin (T) 0.33%, and piperonyl butoxide (PB) 0.29%] on amphibian larvae were investigated. Methods In the laboratory, Rhinella arenarum tadpoles were exposed to nominal concentrations of 0.0000 (control; CO), 0.0003125% (C1); 0.000625...

Emerging contaminants derive from pharmaceuticals, pesticides, disinfection by-products, home and care products, and wood preservation and industrial chemicals that contain specific drugs, metals, metal oxides and metalloids as nanoparticles (NPs) in their formulations. Although the use of silicon dioxide (SiO2) NPs in commercial products increases...

The toxic or nutritionally deleterious effects resulting from the consumption of genetically modified (GM) foods are still a matter of debate worldwide. In amphibians, the environmental impact of the Bacillus thuringiensis (Bt) toxin (e.g., Cry proteins) engineered into GM Bt crops is barely known. Thus, the aim of the present study was to evaluate...

To navigate in space most vertebrates need precise positional cues provided by a variety of sensors, including structures in the inner ear, which are exquisitely sensitive to gravity and linear acceleration. Although these structures have been described in many vertebrates, no information is available for anuran larvae. The purpose of our study was...

The assessment of micronucleated erythrocytes (ME) in blood represents a widely used method for the detection of chromosomal damage by chemical agents, such as herbicides that may occur as water contaminants. We investigated the changes in some circulating blood-cell parameters of tadpoles of the common toad (Rhinella arenarum) that were exposed du...

We determined basal levels of cholinesterase (ChE) and carboxylesterase (CbEs; two substrates: α-naphthyl acetate and 4-nitrophenylvalerate) in different tissues of tadpoles and adults of the frog Pseudis paradoxa and evaluated their use as complementary biomarkers of anti-cholinesterase pesticide exposure. ChE and CbEs sensitivity to malaoxon was...

The assessment of micronucleated erythrocytes (ME) in blood represents a widely used method for the detection of chromosomal damage by chemical agents, such as herbicides that may occur as water contaminants. We investigated the changes in some circulating blood-cell parameters of tadpoles of the common toad (Rhinella arenarum) that were exposed du...

Se estimó y se comparó la edad y tamaño corporal en la madurez sexual, longevidad y potencial reproductivo en 2 especies de anfibios Leptodactylus latinasus y Leptodactylus mystacinus provenientes de un cultivo de soja (CS) y una reserva natural Parque General San Martín (PGSM) (Entre Ríos-Argentina), usando técnicas de esqueletocronología. La edad...

Different biological variables of tadpoles, including survival, development and growth rates, and biomarkers [cholinesterases, glutathione-S-transferases (GST), and blood cell morphology] were evaluated in two anuran species, Scinax squalirostris (Hylidae) and Leptodactylus mystacinus (Leptodactylidae), using in situ experimental chambers in a rice...

In this study, amphibian tadpoles of Hypsiboas pulchellus were exposed to herbicide Liberty(®), which contains glufosinate ammonium (GLA), for 48 h to the following concentrations: 0 (control), 3.55, 4.74, 6.32, 8.43, 11.25, 15, 20, 26.6, and 35.5 mg GLA L(-1). Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) activities, as well as swim...

We investigated the effects of four commercial formulations of herbicides (glyphosate [GLY], metsulfuron-methyl [MET], bispyribac-sodium [BIS], and picloram [PIC]) individually, and in three 50:50 mixtures (GLY–MET, GLY–BIS, GLY–PIC) on the common toad Rhinella arenarum (Anura: Bufonidae) tadpoles. Enzymatic parameters such as, glutathione S-transf...

Trombiculid mites are known to parasitize a variety of amphibian species; however, few comparisons of mite parasitism among sites have been made. Here, Hannemania sp. parasitism in frogs (Leptodactylus chaquensis) inhabiting agroecosystems from mideastern Argentina was described. A total of 40 adult frogs (22 females and 18 males) were analyzed to...

We herein report on the first west-southern most record of Argenteohyla siemersi pederseni in Argentina. This finding was recorded ca. 250 km far from the nearest known locality in Corrientes, and also enlarges the distribution range for including for the Santa Fe Province.

We determined normal plasma butyrylcholinesterase (BChE), carboxylesterase (CbE using α-NA substrate), and glutathione S-transferase (GST) activities in Caiman latirostris and Phrynops hilarii to obtain reference values for organophosphorus (OP) pesticide monitoring. BChE and CbE sensitivity to malaoxon was also evaluated. C. latirostris (N = 12; s...

We present the first compilation and analysis of cases of morphologically abnormal anurans from the mideastern region of Argentina (Córdoba, Santa Fe, and Entre Ríos Provinces). We sampled for abnormal individuals at 51 sites in agricultural, suburban, and forest settings between January 2000 and December 2009. We recorded 71 abnormal individuals,...

Activity of B-esterases (BChE: butyrylcholinesterase and CbE: carboxylesterase using two model substrates: α-naphthyl acetate and 4-nitrophenyl valerate) in a native frog, Leptodactylus chaquensis from rice fields (RF1: methamidophos and RF2: cypermethrin and endosulfan sprayed by aircraft) and non-contaminated area (pristine forest) was measured....

Mortality of vertebrates was monitored on 2 roads (National Road 168; NR168 and Provincial Road 1; PR1) in Santa Fe Province (Argentina) from October 2007 to August 2008. These roads differed in traffic volume and surrounding landscape management conditions. We also investigated the influence of environmental variables (mean monthly air temperature...

Mortality of vertebrates was monitored on 2 roads (National Road 168; NR168 and Provincial Road 1; PR1) in Santa Fe Province (Argentina) from October 2007 to August 2008. These roads differed in traffic volume and surrounding landscape management conditions. We also investigated the influence of environmental variables (mean monthly air temperature...

In this study, we determined normal serum butyrylcholinesterase (BChE) and carboxylesterase (CbE) activities in Tupinambis merianae in order to obtain reference values for organophosphorus pesticide monitoring. Forty-two T. merianae individuals were grouped by sex and size to identify potential differences in their enzyme levels to allow for proper...

Hematology and blood cell cytochemistry of Rhinella fernandezae (Amphibia: Anura) from Espinal and Delta-Islands of Paraná River, Argentina. The description of amphibian hematology is scarce and most of these studies have been done in species from North America, Asia and Europe. With the purpose to obtain basic hematological information of Rhinella...

The description of amphibian hematology is scarce and most of these studies have been done in species from North America, Asia and Europe. With the purpose to obtain basic hematological information of Rhinella fernandezae, 23 blood samples from Santa Fe and Entre Rios natural reserves were studied. Blood of each individual was extracted by cardiac...

Soybean fields provide habitats for many species of amphibians. However, the persistence and health of amphibian populations may be at risk from the increasing use of pesticides and other agricultural chemicals. We examined the activities of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and carboxylesterases (CbEs) in 11 syntopic speci...

Environmental contaminants can disrupt interactions between aquatic species by altering community structure. We explored predator-prey interactions between marbled swamp juvenile eels (Synbranchus marmoratus; predator) and anuran tadpoles (Hypsiboas pulchellus; prey) in relation to two aspects: the importance of lateral line in the predator and whe...

En el presente trabajo se brindan los primeros registros de endoparásitos en cinco especies de anfibios anuros del litoral argentino, contribuyendo al conocimiento sobre la diversidad parasitaria relacionada a estos vertebrados.

We determined the normal levels of butyrylcholinesterase (BChE), carboxylesterase (CbE), and glutathione S-transferases (GST) activities in three South American toad species in order to establish reference values for field pesticide monitoring purposes. Interspecies variations in B-esterase and GST activities were examined according to body mass. I...

To test the hypothesis that eutrophication ponds modulate some aspects of the health responses and survival of anuran tadpoles, we conducted field experiments using Scinax nasicus as sentinel organism to evaluate the quality of two ponds filled with agricultural runoff in a dominant agricultural landscape of Mid-Western Entre Ríos Province (Argenti...