High trophic niche overlap between sympatric peacock basses (Cichliformes: Cichlidae: Cichla): Concordant findings from three dietary analysis methods. [PDF]
J Fish BiolAbstract Dietary analysis has contributed to our understanding of animal niches, interspecific interactions, community structure and the flow of matter and energy in food webs. We employed three methods of dietary analysis to estimate trophic niche overlap between two peacock bass species, Cichla cataractae and Cichla ocellaris, across sympatric ...
Fry BL, Roberts HC, Winemiller KO.
europepmc +2 more sources
On traits matching and the modular organization of food web and occurrence networks. [PDF]
J Anim EcolWhat mechanisms shape ecological networks? In Paraná River piscivores, species traits and abundance scaling promote modular structures. Our findings reveal how communities self‐organize and highlight the conditions needed to sustain them. Abstract Modularity and nestedness have been observed recurrently across different ecological networks, including ...
Borzone Mas D +5 more
europepmc +2 more sources
eLife, 2022 Brain region size generally scales allometrically with brain size, but mosaic shifts in brain region size independent of brain size have been found in several lineages and may be related to the evolution of behavioral novelty.
Erika L Schumacher, Bruce A Carlson
doaj +1 more source
Linking rivers, mixing faunas: How artificial connectivity between the Middle and Upper Paraná River basins shapes fish diversity in a tributary of the Itaipu Reservoir, Brazil. [PDF]
J Fish BiolAbstract This work aimed to investigate the distribution and occurrence of fish species along the São Francisco Falso Braço Norte (SFFBN) River basin, a tributary of the Middle Paraná River basin now artificially connected to the Upper Paraná ecoregion, to evaluate how such connectivity may affect the biogeographic distribution and regional composition
Kampfert LEP +5 more
europepmc +2 more sources
Spooky Interaction at a Distance in Cave and Surface Dwelling Electric Fishes
Frontiers in Integrative Neuroscience, 2020 Glass knifefish (Eigenmannia) are a group of weakly electric fishes found throughout the Amazon basin. Their electric organ discharges (EODs) are energetically costly adaptations used in social communication and for localizing conspecifics and other ...
Eric S. Fortune +6 more
doaj +1 more source
Comparable ages for the independent origins of electrogenesis in African and South American weakly electric fishes. [PDF]
PLoS ONE, 2012 One of the most remarkable examples of convergent evolution among vertebrates is illustrated by the independent origins of an active electric sense in South American and African weakly electric fishes, the Gymnotiformes and Mormyroidea, respectively ...
Sébastien Lavoué +5 more
doaj +1 more source
Illustrated list of additions to the ichthyofauna of the Caura River, Venezuela [PDF]
Check List, 2012 Twenty nine species have been added to the annotated checklists of the ichthyofauna of the Caura River Basin, Guiana Shield, Venezuela. Of these, 18 were found in two floodplain lagoons in the lower Caura, corresponding to the orders Characiformes ...
Nirson González +3 more
doaj +3 more sources
Fish, Sorocaba river sub-basin, state of São Paulo, Brazil. [PDF]
Check List, 2007 In this paper we present a list of the fish fauna of Sorocaba river sub-basin. Fish were caught with gillnets,sieves and puçás, a sort of funnel net. We listed 71 species, distributed in 7 orders, 22 families and 50 genera.Characiformes are represented ...
Smith, W. S. +2 more
doaj +4 more sources
Boletim do Instituto de Pesca, 2018 Este estudo avaliou os parasitos endohelmínticos do peixe nativo Gymnotus spp. coletados de diferentes isqueiros comerciais na bacia do Pantanal, Mato Grosso do Sul, Brasil Central.
Arlene Sobrinho VENTURA +5 more
doaj +1 more source
Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non-Native Fishes From the Lower Doce River Basin in Southeastern Brazil. [PDF]
Anat Histol EmbryolABSTRACT The ichthyofauna of the lower Doce River basin has been exposed to multiple anthropogenic stressors. Among these, the collapse of the Fundão mining tailings dam in Mariana, Minas Gerais, Brazil, in 2015 resulted in massive fish mortality and widespread contamination of aquatic environments.
Marcon L +8 more
europepmc +2 more sources