Instituto Pro Pampa IPPAMPA

Pelotas, Brazil

Instituto Pro Pampa IPPAMPA

Pelotas, Brazil
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Volcan M.V.,Instituto Pro Pampa IPPampa | Klotzel B.,Instituto Pro Pampa IPPampa | Lanes L.E.K.,Instituto Pro Pampa IPPampa | Lanes L.E.K.,Grande Rio University
Zootaxa | Year: 2017

Two new species of the genus Melanorivulus are herein described from the middle Rio Verde drainage, upper Rio Paraná basin, Mato Grosso do Sul, Brazil. Both new species are members of the Melanorivulus pictus clade, diagnosed by having ventral process of angulo-articular vestigial and flanks intense greenish blue or greenish golden to purplish blue above anal fin base in males. Melanorivulus nigropunctatus, new species, from wetlands of a small drainage tributary of right side of the Rio Verde, differs from all other congeners by possessing black dots over the head and body in both sexes and pectoral fin orange with a dark grey margin in males. Melanorivulus ofaie, new species, is found in a similar environment, but at the opposite margin of the Rio Verde. It is distinguished by males presenting flank greenish blue to light blue, with seven to nine oblique chevron-like red bars, ventral portion of head whitish with dark brown spots, dorsal fin yellow with two to three transverse broad red oblique stripes and distal region red, anal fin light orangish yellow, basal area light blue with short red bars and distal portion with a dark red margin, and caudal fin yellow or orangish yellow with three to four vertical red bars in the dorsal and middle portions, sometimes with a orange distal margin. Both new species are considered endangered due to the loss and degradation of their habitat. Copyright © 2017 Magnolia Press.

Volcan M.V.,Instituto Pro Pampa IPPampa | Cheffe M.M.,Setor de Ictiologia | Lanes L.E.K.,Instituto Pro Pampa IPPampa | Burns M.D.M.,Grande Rio University
Check List | Year: 2010

We present here the record of Dormitator maculatus (Bloch, 1792) to the Patos-Mirim lagoon system, Rio Grande do Sul, Brazil. This is also the southernmost occurrence in South America, extending species range ca. 150 km from the previously known localities. © 2010 Check List and Authors.

Volcan M.V.,Instituto Pro Pampa IPPampa | Volcan M.V.,Grande Rio University | Volcan M.V.,Federal University of Santa Maria | Sampaio L.A.,Grande Rio University | And 2 more authors.
Journal of Applied Ichthyology | Year: 2013

Temperature is considered an important factor that influences the life cycle of annual fishes, however the thermal preferendum of Austrolebias nigrofasciatus reproduction has not been defined. The hypothesis was that the fecundity of the species would respond differently within the temperature range analyzed, presenting an optimum thermal. Thus, this study investigated the effect of temperature on the fecundity of A. nigrofasciatus for the first time under laboratory conditions. Pairs of A. nigrofasciatus were placed in aquaria with temperatures of 17, 21 or 25°C, with four pairs (replicates) for each treatment, for five weeks. Contrary to expected, there were no significant differences in fecundity parameters among the tested temperatures, but the weekly fecundity at 17 and 21°C was more homogeneous than at 25°C. During the experimental period, the temperature did not affect male growth; however, at 25°C there was a negative effect on female body growth. The condition factor was also influenced, suggesting a tendency towards a negative energy balance with increasing temperature. The results indicate that temperatures between 17 and 21°C are suitable for broodstock maintenance. © 2012 Blackwell Verlag GmbH.

Lanes L.E.K.,University of the Rio dos Sinos Valley | Lanes L.E.K.,Instituto Pro Pampa IPPAMPA | Keppeler F.W.,University of the Rio dos Sinos Valley | Maltchik L.,University of the Rio dos Sinos Valley
Journal of Natural History | Year: 2014

We investigated abundance variations and life history traits (body size, sex ratio, length-weight relationships and condition factor) of two species of annual fish (Austrolebias minuano Costa and Cheffe and Cynopoecilus fulgens Costa) in temporary ponds of southern Brazil. Six samples were taken from small temporary ponds during three annual seasons over 2 years (2008-2009). A total of 104 individuals of A. minuano and 433 individuals of C. fulgens were collected. The abundance of both species tended to decrease from autumn to spring in the 2 years. The overall sex ratio of A. minuano and C. fulgens were 1.0 male to 1.8 females and 1 male to 1.04 females, respectively. Juveniles of both species occurred only in autumn over the two years and no adult was observed during this season. While the length-weight relationship of A. minuano indicated hyperallometric growth, the relationship of C. fulgens indicated values close to isometric growth. © 2014 © 2014 Taylor & Francis.

Keppeler F.W.,University of the Rio dos Sinos Valley | Lanes L.E.K.,University of the Rio dos Sinos Valley | Lanes L.E.K.,Instituto Pro Pampa IPPampa | Rolon A.S.,University of the Rio dos Sinos Valley | And 2 more authors.
Italian Journal of Zoology | Year: 2013

Studies with annual fish diet have shown that the generalist habit is a dominant strategy within this group. Cynopoecilus fulgens (Cyprinodontiformes: Rivulidae) is a restricted range species, endemic to a small area in Southern Brazil, and aspects of its biology and ecology are poorly known. The main goal of the study was to determine the diet of C. fulgens throughout its life cycle and compare it with the prey availability in Southern Brazil wetlands. Specifically, we analyzed samples collected in different stages of ontogenetic development (immature and adult fishes) in various year seasons. A total of 52 food items were found in the diet of C. fulgens, and invertebrates comprised 96.4% of the counts observed. The richness of consumed and available prey changed along with the seasons. The seasonal variation of the consumed prey richness was mainly related to increase in fish size along the annual cycle. Microcrustaceans represented 75.6%, 80.9%, and 68.4% of the consumed prey in autumn, winter and spring, respectively. Prey composition varied with the seasons and it was not correlated to prey availability. Diet selectivity was different among male, female and immature fish. Our study reported the feeding habits of Cynopoecilus fulgens to improve knowledge of the biological and ecological traits of annual killifishes in Southern Brazil wetlands, where more than 90% of the original wetlands have been lost due to agricultural expansion. © 2013 Copyright 2013 Unione Zoologica Italiana.

da Silva Gocalves C.,São Paulo State University | Souza U.P.,São Paulo State University | Volcan M.V.,Instituto Pro Pampa IPPampa
Neotropical Ichthyology | Year: 2011

Most Rivulidae fishes are popularly known as annual fishes which live in ephemeral environments such as pools, that obligatorily dry out seasonally causing the death of adult individuals. They have unique biological characteristics such as small body size, early sexual maturation, continuous reproduction, an elaborated courtship behavior, and a great reproductive capacity among fishes. The rivulids are widely distributed in North, Central and South America. In this study, the diet and reproductive biology of Cynopoecilus melanotaenia was analyzed. A total of 263 specimens were collected and the analysis of 233 gastrointestinal contents revealed an invertivorous diet composed mainly of small crustaceans (Cladocera, Amphipoda, and Ostracoda) and immature insects (Chaoboridae, Culicidae, Syrphidae, but mainly Chironomidae larvae). Lepidophagy on male's diet was also registered. Fecundity was estimated by analyzing 59 pairs of mature ovaries and ranged from 2 to 157 oocytes (mean, 19 ± 26[SD]). The species has fractional spawning, a strategy to increase the chance of survival to prolonged depletions. This study is the first to investigate the reproductive biology of C. melanotaenia. The results confirmed the opportunistic character of the rivulid C. melanotaenia and provided unreported reproductive information that may aid conservation of the species. © 2011 Sociedade Brasileira de Ictiologia.

Volcan M.V.,Instituto Pro Pampa IPPampa | Lanes L.E.K.,Instituto Pro Pampa IPPampa | Goncalves A.C.,Instituto Pro Pampa IPPampa
Check List | Year: 2010

The present note extends the distribution of annual killifish Austrolebias periodicus, a endangered species, endemic of the Pampas region, in Ibicuí River basin, state of Rio Grande do Sul, southern Brazil. This information is needed to develop conservation strategies for this species and its habitat, which are at high risk due to the expansion of rice production and exotic forests in southern Brazil. © 2010 Check List and Authors.

Cheffe M.M.,Rua Tiradentes 2247 | Volcan M.V.,Instituto Pro Pampa IPPampa | Lanes L.E.K.,Instituto Pro Pampa IPPampa
Check List | Year: 2010

The present note records for the first time the annual fish Austrolebias vazferreirai (Berkenkamp, Etzel, Reichert and Salvia) from state of Rio Grande do Sul, southern Brazil. © 2010 Check List and Authors.

Volcan M.V.,Federal University of Santa Maria | Volcan M.V.,Instituto Pro Pampa IPPampa | Goncalves A.C.,Federal University of Santa Maria | Goncalves A.C.,Instituto Pro Pampa IPPampa | Guadagnin D.L.,Federal University of Santa Maria
Journal of Applied Ichthyology | Year: 2013

Summary: The present study describes length-weight relationships (LWRs) of three species of the family Rivulidae, Austrolebias nigrofasciatus, Austrolebias wolterstorffi and Cynopoecilus melanotaenia, captured in temporary freshwater wetlands of southern Rio Grande do Sul, Brazil from May to December 2011. The growth pattern for both species was predicted using a linear regression of LWR. Estimates of parameter b ranged from 2.81 in male C. melanotaenia to 3.34 for females A. nigrofasciatus. The present observations are significant for conservation and management because these species are threatened and their habitats are under pressure. © 2013 Blackwell Verlag GmbH.

Volcan M.V.,Instituto Pro Pampa IPPampa | Goncalves A.C.,Instituto Pro Pampa IPPampa | Lanes L.E.K.,Instituto Pro Pampa IPPampa
Endangered Species Research | Year: 2011

This study presents information on the distribution of Austrolebias cyaneus and A. juanlangi, 2 annual fish species of southern Brazil considered threatened. Furthermore, data are provided on the conservation status of these species and their habitat characteristics to assist in the development of management plans and in the selection of priority areas for conservation of annual fishes in southern Brazil. A total of 6 populations of A. cyaneus and 3 populations of A. juanlangi were sampled from small ponds less than 1000 m2 in surface area. We sampled 104 specimens of A. cyaneus, distributed in the municipality of Rio Pardo and Minas do Leão in the basins of the Francisquinho, Capivari, and Dom Marcos streams, Jacuí River basin. A. juanlangi was recorded in the municipalities of Herval, Hulha Negra, and Pedras Altas, Jaguarão River basin, with 53 specimens being captured. At the sampling sites, the main threat to both species was rice cultivation. All pools were altered, isolated, and in an advanced state of degradation as a result of this monoculture. The restricted distribution area of the annual fishes and the advanced state of degradation and habitat loss of the wetlands sampled in this study justify the creation of conservation units in the areas of occurrence of Rivulidae species. © Inter-Research 2011.

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