The Vaupes Arch and Casiquiare Canal

Winemiller, Kirk O.; Willis, Stuart C.

doi:10.1525/california/9780520268685.003.0014

Cited by 36 publications

(35 citation statements)

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“…This diagnosis confirms that of Cala (1973) present in these areas (Maldonado-Ocampo, et al, 2006;Maldonado-Ocampo, et al, 2008;Winemiller et al, 2008;Lasso, et al, 2009;Miller-Hurtado, et al, 2009;Winemiller & Willis, 2011). Additionally, based on fauna surveys (Cala, 1973;Mojica, 1999;Lasso et al, 2005;Maldonado-Ocampo et al, 2006;2008) The possibility and what we consider to be the most likely scenario that O. ferreirai has been introduced in the Orinoco basin, constitutes a management and conservation dilemma.…”

Section: Discussionsupporting

confidence: 77%

Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829) from the Orinoco and Amazon River basins

Farias

et al. 2013

Neotrop. ichthyol.

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The arowanas, fishes of Gondwanan origin, are represented in South America by the genus Osteoglossum. All species were initially reported as being exclusive to the Amazon region, with O. ferreirai restricted to the Negro River basin and O. bicirrhosum to the Amazon and Essequibo Rivers basin. Starting in the mid 1970's it was reported that O. ferreirai also occurs in the Orinoco River basin. In all regions the arowanas assumed significant socio-economic importance due to their popularity in the international ornamental fish trade, leading to over-exploitation of both species in some areas. The Orinoco populations are particularly heavily exploited, and thus conservation and management measures are needed. Both depend on the clarification of taxonomic status, and phylogenetic distinctness of the Orinoco populations. With the goal of molecularly characterizing the two species of Osteoglossum, and comparing populations of Osteoglossum from the Orinoco and Amazon basins, we characterized individuals sampled from eight localities, one in the Orinoco River basin and seven in the Amazon River basin. We sampled 39 individuals, obtaining 1004 base pairs, of which 79 were synapomorphies. Genetic distance between the two species calculated using the HKY + G model of molecular evolution was 8.94%. Intraspecific distances ranged from 0.42% in O. bicirrhosum to 0.10% in O. ferreirai. The genetic characterization confirmed the taxonomic status of O. ferreirai in the Orinoco basin, and suggested that its distribution in the Orinoco basin is unlikely to be the result of vicariance or natural dispersal, but rather an anthropic introduction.

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Section: Discussionsupporting

confidence: 77%

Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829) from the Orinoco and Amazon River basins

Farias

et al. 2013

Neotrop. ichthyol.

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“…In fact, studies on neotropical fish biogeography have invariably utilized large hydrographic basins as fundamental geographical units (cf. Hubert, Renno, 2006;Ingenito, Buckup, 2007;Buckup, 2011;Schaefer, 2011;Winemiller, Willis, 2011;Lima, Ribeiro, 2011;Mariguela et al, 2013;Camelier, Zanata, 2014). Of course, discrepant evidence has been known for some time, such as the existence of taxa in the same basin each associated with divergent area relationships (cf.…”

Section: E170034[13]mentioning

confidence: 99%

Biogeography of Amazonian fishes: deconstructing river basins as biogeographic units

2017

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Biogeography of Amazonian fishes (2,500 species in vastly disjunct lineages) is complex and has so far been approached only partially. Here, we tackle the problem on the basis of the largest database yet on geographical distribution and phylogenetic relationships of Amazonian fishes, including all information available. Distributions of 4,095 species (both Amazonian and outgroups) and 84 phylogenetic hypotheses (comprising 549 phylogenetically-informative nodes) were compiled, qualified and plotted onto 46 areas (29 Amazonian and 17 non-Amazonian). The database was analyzed with PAE, CADE, BPA and BPA 0 , yielding largely congruent results and indicating that biogeographic signal is detectable on multiple dimensions of fish distribution, from single species ranges to cladistic congruence. Agreement is especially pronounced in deeper components, such as Trans-Andean, Cis-Andean, Western Amazon and Orinoco basins. Results show that all major Amazonian tributaries, as well as the Amazon basin itself, are non-monophyletic and constitute hybrid sets of heterogeneous biotic partitions. Amazonian drainages should not be assumed a priori as historically cohesive areas, contrary to widespread practice. Our hypothesis allows reevaluation of broader issues in historical biogeography, such as the predictive power of biogeographic hypotheses, the vicariant/ dispersal duality, the significance of widely distributed taxa, and the need for temporal dimension in biogeographic patterns. A biogeografia dos peixes amazônicos (2.500 espécies de diferentes linhagens) é complexa e até agora foi abordada apenas parcialmente. Aqui abordamos o problema com base no maior banco de dados já feito sobre a distribuição geográfica e as relações filogenéticas dos peixes amazônicos, incluindo todas as informações disponíveis. A distribuição de 4.095 espécies (tanto amazônicas como de grupos-externos) e 84 hipóteses filogenéticas (que incluíam 549 nós filogeneticamente informativos) foram compiladas e qualificadas em 46 áreas (29 amazônicas e 17 não-amazônicas). O banco de dados foi analisado a partir das metodologias PAE, CADE, BPA e BPA0, resultando em topologias amplamente congruentes e indicando que o sinal biogeográfico é detectável em múltiplas dimensões, desde a simples distribuição de peixes até em congruência cladística. A concordância topológica é especialmente pronunciada em componentes mais profundos, como as bacias Trans-Andina, Cis-Andina, Amazonas Ocidental e Orinoco. Os resultados demonstram que todos os principais afluentes amazônicos, bem como a própria bacia amazônica, não são monofiléticos e constituem conjuntos híbridos formados a partir de parcelas bióticas heterogêneas. As drenagens amazônicas não devem ser consideradas a priori como áreas historicamente coesas, contrariamente à prática generalizada. Nossa hipótese permite a reavaliação de questões mais amplas na biogeografia histórica, como o poder preditivo de hipóteses biogeográficas, a dualidade vicariante/dispersão, significância de táxons amplamente distribuídos e a n...

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“…). Based on rates of new Amazonian fish species descriptions the actual number inhabiting the Amazon Basin is probably greatly underestimated (Winemiller and Willis, ). The processes having generated this highly diverse fish fauna are incomplete (Hubert and Renno, ; Albert et al., ).…”

Section: Introductionmentioning

confidence: 99%

Opinion Paper: how vulnerable are Amazonian freshwater fishes to ongoing climate change?

et al. 2015

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Summary With around 15% of all described freshwater fish species in the world, the Amazon Basin is by far the most fish species‐rich freshwater ecosystem on the planet. In this opinion paper, a rough evaluation is given on just how vulnerable Amazonian freshwater fishes are to ongoing climate change. And to argue that current anthropogenic threats through rapid expansion of human infrastructure and economic activities in the basin could be a far greater threat to fish communities than those anticipated by any future climate change. Conservation actions in the Amazon Basin should focus preferentially on reducing the impacts of present‐day anthropogenic threats.

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The Vaupes Arch and Casiquiare Canal

Cited by 36 publications

References 0 publications

Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829) from the Orinoco and Amazon River basins

Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829) from the Orinoco and Amazon River basins

Biogeography of Amazonian fishes: deconstructing river basins as biogeographic units

Opinion Paper: how vulnerable are Amazonian freshwater fishes to ongoing climate change?

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