Related Experiment Video
Updated: Aug 14, 2026

Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus
Published on: February 14, 2021
Spatial synchrony of a highly endemic fish assemblage (Segredo Reservoir, Iguaçu River, Paraná State, Brazil)
W M Domingues1, L M Bini, A A Agostinho
1Nupelia, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil. domingueswm@nupelia.uem.br
Abstract:
In this study, patterns of spatial synchrony in population fluctuations (cross-correlation) of an endemic fish assemblage of a Neotropical reservoir (Segredo Reservoir, Iguaçu River, Paraná State, Brazil) were reported. First, the level of population synchrony for 20 species was estimated. Second, population synchrony was correlated, using the Mantel test, with geographical distances among sites (n = 11) and also environmental synchrony (temperature). Nine species presented significant correlations between spatial synchrony and geographic distances (Astyanax sp. b, Astyanax sp. c, Pimelodus sp., Hoplias malabaricus, Crenicichla iguassuensis, Hypostomus derbyi, Hypostomus myersi, Rhamdia branneri, and R. voulezi). Considering the ecology of the species and the significant relationship between population and environmental synchronies, it seems that environmental stochasticity is the most plausible hypothesis in explaining the observed synchrony patterns.
Related Concept Videos
Multi-species Conserved Sequences
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Genetics of Speciation
Speciation Rates
Osmoregulation in Fishes
Conservation of Declining Populations
Conservation of Small Populations
