A new species of Leporinus Agassiz, 1829 from the upper Rio Paraná basin (Characiformes, Anostomidae) with redescription of L. elongatus Valenciennes, 1850 and L. obtusidens (Valenciennes, 1837)

Britski, Heraldo A.; Birindelli, José L. O.; Garavello, Júlio César

doi:10.1590/s0031-10492012021700001

Cited by 25 publications

(22 citation statements)

References 5 publications

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“…Nets were operated by sweeping semicircles next to the shore for 1 hr at dusk (17:30–18:30). Collected samples were fixed in formalin (4%) and identified based on a specialised bibliography (Britski, Birindelli, & Garavello, ; Graça & Pavanelli, ). Species names followed Eschmeyer, Fricke, and Van Der Laan ().…”

Section: Methodsmentioning

confidence: 99%

Environmental heterogeneity and dispersal limitation explain different aspects of β‐diversity in Neotropical fish assemblages

Peláez

Pavanelli

2018

Freshwater Biology

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From a metacommunity perspective, patterns of β‐diversity emerge from the interplay between spatial and environmental processes. For obligate aquatic dispersers, river network constraints can be reflected in diversity patterns. Here, we aimed to determine the effects of environmental heterogeneity and spatial connectivity on β‐diversity components. We sampled fish assemblages in 21 sites across a longitudinal gradient. Beta‐diversity for taxonomic and functional composition among sites was decomposed into its turnover and nestedness components. We investigated whether environment was more important to functional β‐diversity and spatial factors had a higher contribution to dissimilarity in species composition. Further, we tested whether environmentally homogeneous sites with higher spatial connectivity showed lower compositional changes. We found that spatial factors were more important for taxonomic β‐diversity, whereas environment explained functional dissimilarity among habitats. Although environment and spatial factors contribute to total β‐diversity, they explained different components: while environment explained a higher portion of turnover, spatial factors were related to nestedness. The effects of mere spatial isolation and directional connectivity differed for species and functional β‐diversity and for the components of β‐diversity. Including directionality in spatial connectivity enabled the explanation of a higher proportion of variation of total species β‐diversity and its turnover. Our results suggest that niche and spatial processes may influence differently taxonomic and functional β‐diversity components. Thus, habitat filtering was the primary mechanism affecting functional diversity and species turnover, whereas spatial connectivity drove species nestedness.

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Section: Methodsmentioning

confidence: 99%

Environmental heterogeneity and dispersal limitation explain different aspects of β‐diversity in Neotropical fish assemblages

Peláez

Pavanelli

2018

Freshwater Biology

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“…Fish samples were fixed in formalin (10%) and identified based on specialized bibliography (e.g. Graça & Pavanelli, 2007;Britski et al, 2012). Voucher specimens were deposited at the fish collection of the Research Nucleus in Limnology, Ichthyology and Aquaculture (Nupélia), Maringá State University, Brazil.…”

Section: Samplingmentioning

confidence: 99%

Environmental heterogeneity explains species turnover but not nestedness in fish assemblages of a Neotropical basin

2017

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Aim: Heterogenous environments can contribute to maintain biodiversity. Traditionally beta diversity studies have focused on determining the effect of environmental variables on the total dissimilarity of species composition. However, decomposing beta diversity in species replacement and nestedness could give new insights on mechanisms affecting spatial patterns of biodiversity. We aimed to answer two main questions about spatial patterns of fish diversity in a Neotropical basin: 1) whether some regions contribute differently to fish diversity, and 2) whether species turnover and nestedness are explained by environmental gradients. Methods Sampling sites in the main channel and tributaries of the Upper Paraná River were sampled between 2013 and 2015. We partitioned beta diversity and tested the relationship of turnover and nestedness with environmental variables. Results 74 species were captured. Some of these species were restricted to different sites, contributing to variation in species composition. Hill numbers showed a trend for higher diversity in the tributaries than in Paraná River sampling sites, and the partition of beta diversity revealed that species replacement drove dissimilarity in species composition. Only total beta diversity and turnover were related to environmental variables, mainly conductivity and turbidity. Conclusions Species diversity and composition of fish assemblages in the Upper Paraná River could be related to environmental gradients. Overall, our results suggest that Paraná River tributaries contribute to increase environmental heterogeneity, and hence to maintain a high diversity and variation in species composition. For that reason, we strongly recommend preserving highly heterogeneous habitats in the region.

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“…Anostomidae is one of the most diverse families of Characiformes (Reis et al, 2003) and the number of known species is still increasing rapidly as field expeditions are carried out and museum's old collections are revisited (Birindelli, Britski, 2009;Britski et al, 2012). The family currently includes 15 genera (Sidlauskas, Vari, 2008;Ramirez et al, 2017), with species unevenly distributed among them.…”

Section: Introductionmentioning

confidence: 99%

New species of Leporinus (Characiformes: Anostomidae) from the highlands of the Guiana Shield in Venezuela

2019

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A new species of Leporinus is described using morphological data and compared to all other species of the family. Specimens were illustrated using digital photograph, measured using digital calipers, and had teeth, scales, and fin rays counted under a stereomicroscope. The new species is distinguished from all other Anostomidae, except Anostomus anostomus, A. brevior, A. ternetzi, Hypomasticus despaxi, Leporinus arcus, and L. striatus, by having four dark longitudinal stripes on body. The new species is distinguished from aforementioned species by having terminal mouth with four teeth on the premaxilla, 12 series of scales around caudal peduncle, and 34 to 36 scales in the lateral line. The new species is remarkably similar to Leporinus arcus, which occurs on the opposite side of Guyana Shield highlands. The new species and L. arcus are possibly closely related to Leporinus gomesi, L. granti, L. lebaili, L. melanostictus, L. nijsseni, and L. santosi. Uma espécie nova de Leporinus é descrita usando dados morfológicos e comparações entre todas as espécies da família. Exemplares foram ilustrados com fotografia digital, medidos com paquímetro digital e seus dentes, escamas e raios das nadadeiras foram contados sob estereomicroscópio. A espécie nova distingue-se dos demais Anostomidae, exceto Anostomus anostomus, A. brevior, A. ternetzi, Hypomasticus despaxi, Leporinus arcus e L. striatus, por apresentar quatro faixas longitudinais no corpo. A nova espécie distingue-se das espécies mencionadas por ter boca terminal com quatro dentes no osso pré-maxilar, 12 séries de escamas ao redor do pedúnculo caudal e 34 a 36 escamas na linha lateral. A espécie nova é particularmente similar à Leporinus arcus, que ocorre no lado oposto das terras altas do Escudo da Guiana. A espécie nova e L. arcus, possivelmente, são relacionadas proximamente à Leporinus gomesi, L. granti, L. lebaili, L. melanostictus, L. nijsseni e L. santosi. Palavras-chave: América do Sul,

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A new species of Leporinus Agassiz, 1829 from the upper Rio Paraná basin (Characiformes, Anostomidae) with redescription of L. elongatus Valenciennes, 1850 and L. obtusidens (Valenciennes, 1837)

Cited by 25 publications

References 5 publications

Environmental heterogeneity and dispersal limitation explain different aspects of β‐diversity in Neotropical fish assemblages

Environmental heterogeneity and dispersal limitation explain different aspects of β‐diversity in Neotropical fish assemblages

Environmental heterogeneity explains species turnover but not nestedness in fish assemblages of a Neotropical basin

New species of Leporinus (Characiformes: Anostomidae) from the highlands of the Guiana Shield in Venezuela

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