Efficiency of fish ladders for neotropical ichthyofauna

2002 ◽  
Vol 18 (3) ◽  
pp. 299-306 ◽  
Author(s):  
Angelo Antonio Agostinho ◽  
Luiz Carlos Gomes ◽  
Domingo Rodriguez Fernandez ◽  
Harumi Irene Suzuki
Keyword(s):  
Neotropical Ichthyofauna

Phylogeography of the piranha genera Serrasalmus and Pygocentrus: implications for the diversification of the Neotropical ichthyofauna

2007 ◽  
Vol 16 (10) ◽  
pp. 2115-2136 ◽  
Author(s):  
NICOLAS HUBERT ◽  
FABRICE DUPONCHELLE ◽  
JESUS NUÑEZ ◽  
CARMEN GARCIA-DAVILA ◽  
DIDIER PAUGY ◽  
...  
Keyword(s):  
Neotropical Ichthyofauna

On the Eocene cichlids from the Lumbrera Formation: additions and implications for the Neotropical ichthyofauna

2014 ◽  
Vol 34 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Maria C. Malabarba ◽  
Luiz R. Malabarba ◽  
Hernán López-Fernández
Keyword(s):  
Neotropical Ichthyofauna

scholarly journals Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

2007 ◽  
Vol 5 (2) ◽  
pp. 139-146 ◽  
Author(s):  
Hersília de Andrade e Santos ◽  
Paulo dos Santos Pompeu ◽  
Carlos Barreira Martinez
Keyword(s):  
Latin America ◽  
Critical Speed ◽  
Swimming Performance ◽  
Neotropical Fish ◽  
Neotropical Species ◽  
Total Length ◽  
Influence Of Water ◽  
Time Class ◽  
Swimming Capacity ◽  
Neotropical Ichthyofauna

The fishways built in Latin America were mainly based on those used in the northern hemisphere for passing salmonids upstream. However, the swimming capacity in terms of speed and endurance is a major factor concerning the design of a fishway, and this information is not available for migratory neotropical fish species. Therefore, studies on swimming performance of neotropical species is fundamental. The aim of this study was to estimate the critical, sustained and prolonged speeds for the piau-três-pintas Leporinus reinhardti, and to evaluate the influence of water temperature on the swimming performance of the species. Variable (increasing) and fixed velocity tests were performed in a respirometer. When compared to other species whose critical speed data are available, the piau showed higher speeds, for a given total length. Fatigue times per prolonged speed class were estimated as well as prolonged speed per fatigue time class. The changing point from sustained to prolonged swimming was estimated to occur approximately at a speed of seven body-lengths per second (1.12 m/s for an individual with 16 cm total length: the first maturation length). In spite of the great swimming performance of piau, the adoption of efficient directives in fishway projects to allow the passage of neotropical ichthyofauna, will depend on a more detailed analysis of the swimming capacity of different species.

scholarly journals Spatial variations in fish assemblage structure in a southeastern Brazilian reservoir

2016 ◽  
Vol 76 (1) ◽  
pp. 185-193 ◽  
Author(s):  
B. O. Sanches ◽  
R. M. Hughes ◽  
D. R. Macedo ◽  
M. Callisto ◽  
G. B. Santos
Keyword(s):  
Fish Assemblage ◽  
Assemblage Structure ◽  
Spatial Variations ◽  
Fish Assemblage Structure ◽  
Longitudinal Gradient ◽  
Parana Basin ◽  
Riverine Systems ◽  
Pimelodus Maculatus ◽  
Strong Adaptation ◽  
Neotropical Ichthyofauna

Abstract We assessed the fish assemblage structure and composition of Nova Ponte Reservoir (Araguari River, Upper Paraná Basin, Brazil). We observed significant differences in abundance (p = 0.0003), richness (p = 0.0005) and diversity (p = 0.02) between lacustrine and riverine zones of the reservoir. Nine species were significantly more abundant in the riverine region: Astyanax altiparanae, Astyanax gr. fasciatus, Galeocharax knerii, Hoplias intermedius, Hypostomus sp., Leporinus friderici, Leporinus obtusidens, Pimelodus maculatus and Schizodon nasutus. The results indicated a longitudinal gradient in the composition and abundance of fishes in Nova Ponte Reservoir, reinforcing the importance of freely flowing riverine reaches for conserving native neotropical ichthyofauna and reflecting the strong adaptation of these species to riverine systems.

scholarly journals Challenges in assessing the Neotropical fishes using DNA metabarcoding

2021 ◽  
Vol 4 ◽  
Author(s):  
Izabela Mendes ◽  
Heron Hilário ◽  
Daniel Teixeira ◽  
Daniel Cardoso de Carvalho
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Species Level ◽  
Reference Sequence ◽  
Single Individual ◽  
Neotropical Fishes ◽  
Two Samples ◽  
Dna Metabarcoding ◽  
Primer Sets ◽  
Neotropical Ichthyofauna

Species richness is a metric of biodiversity usually used in fish community assessment for monitoring programs. This metric is often obtained using traditional fisheries methods that rely on capture of target organisms, resulting in underestimation of fish species. DNA metabarcoding has been recognized as a powerful noninvasive alternative tool for fish biomonitoring and management. Despite the increasing popularity of this method for the assessment of aquatic megadiverse ecosystems, its implementation for studying the highly diverse Neotropical ichthyofauna still presents some challenges. One of them is to devise what primer set could reliably amplify the DNA of all fish species from a megadiverse river basin and have enough resolution to identify them. In order to identify and overcome these drawbacks, we have investigated the efficiency of the metabarcoding approach on Neotropical fishes using a mock sample containing genomic DNA of 18 fish species from the Jequitinhonha River basin, Eastern Brazil. We compared three primer sets targeting the 12S rRNA gene: two universal and widely used markers for fish metabarcoding [MiFish (~170bp) and Teleo_1 (~60bp)], and NeoFish (~190bp), recently developed by our research group specifically for the identification of Neotropical fishes (Milan et al., 2020). Two samples amplified using three primers were sequenced in a single multiplexed Illumina MiniSeq run, using normalized and non-normalized pools. Bioinformatic analyses were performed using a DADA2/Phyloseq based pipeline to perform filtering steps and to assign Amplicon Sequence Variants (ASVs). We used a custom 12S reference sequence database that included 190 specimens representing 101 species and 70 genera from the Jequitinhonha and São Francisco river basins. A total of 187 ASVs were recovered: 79, 66 and 42 for NeoFish, MiFish and Teleo_1, respectively. ASVs of unexpected species were identified for both pools (Fig. 1), though each of these ASVs had an abundance of less than 50 copies. In addition, species of the Hoplias and Prochilodus genera could not be identified at the species level, due to identical sequences within each genus, possibly because of the insufficient variation within the 12S region recovered by these primers’ amplicons. Unexpectedly, although a single individual of each species was placed in the pools, more than one ASV was identified for some species, likely caused by PCR biases. Overall, all primer sets displayed similar taxonomic resolution for the DNA pools and recovered all species, except for NeoFish, which could not detect Steindachneridion amblyurum due to an incompatibility in the 3’ of the NeoFish forward primer and Teleo_1, which could not identify Steindachnerina elegans. These results highlight the need of reliable databases in order to enable the full assignment of ASVs and OTUs to species level, and the importance of calibrating the DNA metabarcoding approach with mock samples to identify weaknesses and pivotal steps prior to the application on large scale DNA based biodiversity evaluation, that can help with the complex task of conserving the megadiverse Neotropical ichthyofauna.

scholarly journals Molecular species delimitation of the genera Anodus, Argonectes, Bivibranchia and Micromischodus (Ostariophysi: Characiformes)

2021 ◽  
Vol 19 (4) ◽  
Author(s):  
Acácio Freitas Nogueira ◽  
Claudio Oliveira ◽  
Francisco Langeani ◽  
Andre Luiz Netto-Ferreira
Keyword(s):  
Molecular Species ◽  
Species Delimitation ◽  
Valid Species ◽  
Species Boundaries ◽  
Nominal Species ◽  
Sources Of Information ◽  
Biological Studies ◽  
The Family ◽  
Living Organisms ◽  
Neotropical Ichthyofauna

ABSTRACT A good taxonomic assessment of specimens is an essential task to many biological studies and DNA data have provided additional sources of information to assist in the disentanglement of taxonomic problems among living organisms, as has been the case of some taxa of the megadiverse Neotropical ichthyofauna. Here we assessed all valid species in the Neotropical freshwater fish genera Anodus, Argonectes, Bivibranchia and Micromischodus of the family Hemiodontidae to establish molecular species boundaries among them. All species delimitation methods defined exactly only one MOTU for Anodus elongatus, Argonectes longiceps, A. robertsi, Bivibranchia bimaculata, B. notata, B. velox, and Micromischodus sugillatus, resulting in total congruence between nominal species and MOTUs for these seven taxa. The three species having discordant results across analyses: Anodus orinocensis, Bivibranchia fowleri, and Bivibranchia simulata, matched more than one MOTU per species in some methods, meaning that cryptic diversity may exist within these taxa. Overall, this great correspondence among morphological and molecular boundaries for thae species analysed seem to be indicative of a reasonably stable taxonomy within these Hemiodontidae genera.

scholarly journals Drastic reduction of the functional diversity of native ichthyofauna in a Neotropical lake following invasion by piscivorous fishes

2021 ◽  
Vol 19 (3) ◽  
Author(s):  
Carla Patrícia de Souza ◽  
Carlos Alberto de Sousa Rodrigues-Filho ◽  
Francisco Antônio Rodrigues Barbosa ◽  
Rafael Pereira Leitão
Keyword(s):  
Functional Diversity ◽  
Native Species ◽  
Ecological Processes ◽  
Native Communities ◽  
Functional Richness ◽  
Main Driver ◽  
Biodiversity Changes ◽  
Native Species Richness ◽  
Over Time ◽  
Neotropical Ichthyofauna

Abstract Biological invasions are leading several species to extinction and are projected as a main driver of biodiversity changes in lakes for this century. However, the knowledge of their impacts on the Neotropical ichthyofauna over time remains largely incipient, especially when considering the functional diversity of native communities. Here we aim to identify the effects of non-native species, especially the non-native piscivorous Cichla kelberi and Pygocentrus nattereri, on the functional diversity of the native ichthyofauna of the Carioca Lake, Middle Rio Doce basin, state of Minas Gerais. Using fish occurrence data for eight years from 1983 to 2010 combined with an ecomorphological-trait analysis, we found that while the native species richness dropped to 56%, the functional richness is only 27% of that found before introductions. In other words, more than species, the ichthyofauna suffered an impressive decline in the range of functional traits, which can further have severe impacts on ecological processes within that system. When considering all the components of the current ichthyofauna (native and non-native species), neither taxonomic nor functional richness have changed over time. However, even keeping biodiversity levels, non-native species are not able to fully compensate for the extinct native ones in terms of functions.

scholarly journals Revealing Hidden Diversity of the Underestimated Neotropical Ichthyofauna: DNA Barcoding in the Recently Described Genus Megaleporinus (Characiformes: Anostomidae)

2017 ◽  
Vol 8 ◽  
Author(s):  
Jorge L. Ramirez ◽  
Jose L. Birindelli ◽  
Daniel C. Carvalho ◽  
Paulo R. A. M. Affonso ◽  
Paulo C. Venere ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Neotropical Ichthyofauna
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