11 documents found, page 1 of 2
Local environment and fragmentation by drought and damming shape different comp...
Martelo, Joana; Gkenas, Christos; Ribeiro, Diogo; Alves, Maria Judite; Ribeiro, Filipe; Cucherousset, Julien; Gago, João; Magalhaes, Maria FilomenaPool refuges are critical for maintaining stream fish diversity in increasingly intermittent streams. Yet, the patterns and drivers of beta diversity of native and non-native fish in pool refuges remain poorly known. Focusing on Mediterranean streams, we decomposed beta diversity of native and non-native fish into richness difference (RichDiff) and species replacement (Repl), and local (LCBD, LCBDRichDiff and L...
Historical food-web changes in invaded fish communities in the lower Guadiana b...
Gkenas, Christos; Martelo, Joana; Cucherousset, Julien; Ribeiro, Filipe; Gago, João; Alves, Maria Judite; Ribeiro, Diogo; Cheoo, GiselaFreshwater ecosystems are increasingly being reshaped by biological invasions, leading to biotic homogenization and biodiversity loss. However, the extent to which novel species may drive changes in food-web structure over time remains poorly understood. Clarifying changes in historical ecological processes is critical to inform conservation and restoration efforts in recipient ecosystems. Here, we address food...
Widespread Hybridization between Invasive Bleak (Alburnus alburnus) and Iberian...
Curto, Manuel; Morgado-Santos, Miguel; Alexandre, Carlos M.; Alves, Maria Judite; Gante, Hugo F.; Gkenas, Christos; Medeiros, João P.Hybridization between native and nonnative fish species is a major conservation issue, especially in ecosystems with high levels of endemism, such as Iberian streams. To date, hybridization with the invasive bleak Alburnus alburnus has been reported for the Iberian chub Squalius alburnoides and S. pyrenaicus and in scattered locations only. However, the bleak is spreading in the region, potentially increasing t...
Warming affects the feeding success of invader and native fish in Iberian streams
Gkenas, Christos; Kodde, Alexa; Ribeiro, Filipe; Magalhães, Maria FilomenaWe experimentally tested the effects of anticipated warmer temperatures on the feeding suc cess of invasive pumpkinseed and chameleon cichlid and the functionally similar Southern Iberian chub. Singly, prey captures by chub and the cichlid were constant but those by pumpkinseed were affected by warming. Moreover, at warmer temperatures, chub captured much less prey in the presence of the cichlid and prey faster...
Evaluating the range expansion of recreational non-native fishes in Portuguese ...
Martelo, Joana; Da Costa, Luís M.; Ribeiro, Diogo; Gago, João; Magalhães, Maria Filomena; Gante, Hugo F.; Alves, Maria Judite; Cheoo, GiselaUpdating information on the distribution of recently introduced and other poorly known non-natives is essential to prevent and control their spread and better address biological invasions. Here, we combine scientific and citizen science data to update the distribution of five recently arrived (i.e., < 25 years), non-native fish species (Alburnus alburnus, Ameiurus melas, Rutilus rutilus, Sander lucioperca and S...
Desert pumpkinseed: diet composition and breadth in a Moroccan river
Gkenas, Christos; Magalhães, Maria Filomena; Campos-Martin, Nazaret; Ribeiro, Filipe; Clavero, MiguelThe widely invasive North American pumpkinseed sunfish, Lepomis gibbosus, is currently established in desert rivers in Morocco. The success of pumpkinseed in novel ecosystems has been associated with its generalist diet, but this trait remains unevaluated in arid regions. Desert rivers are harsh environments with limited water and prey availability which may adversely constrain the diet of fish. Here we studied...
O PEIXE GATO EUROPEU (SILURUS GLANIS) – UM GIGANTE NO RIO TEJO: DISPERSÃO, DIST...
Gago, João; Ferreira, Marco; Anatácio, Pedro; Gkenas, Christos; Banha, Filipe; Quintella, Bernardo; Ribeiro, FilipeO peixe gato europeu (Silurus glanis) é mais uma espécie não nativa que foi introduzida nos rios da Península Ibérica. Neste trabalho é apresentado o padrão de dispersão desta espécie no rio Tejo desde o primeiro registo em Espanha em 1998 até à atualidade. Mais de 80 registos foram obtidos principalmente através de fóruns e blogs de pesca desportiva. Atualmente estima-se que esta espécie esteja distribuída por...
Genetic structure of the South European toothcarp Aphanius fasciatus (Actinopte...
Cavraro, F.; Malavasi, S.; Torricelli, P.; Gkenas, Christos; Liousia, V.; Leonardos, I.; Kappas, I.; Abatzopoulos, T. J.; Triantafyllidis, A.The genetic structure of Aphanius fasciatus populations has been analysed using two mitochondrial DNA (mtDNA) markers (16S rRNA and D-loop) obtained from specimens collected in nine sites from the Venice lagoon, Comacchio saltworks and Corsica. Available GenBank sequences were also included, in order to extend the results on a Mediterranean scale. Genetic polymorphism within the Venice lagoon was very low, with...
Spatial distribution patterns of the non-native European catfish, Silurus glani...
De Matos Gago, João; Anastácio, P.M.; Gkenas, Christos; Banha, Filipe; Ribeiro, FilipeEffective management of invasive fishes depends on the availability of updated information about their distribution and spatial dispersion. Forensic analysis was performed using online and published data on the European catfish, Silurus glanis L., a recent invader in the Tagus catchment (Iberian Peninsula). Eighty records were obtained mainly from anglers’ fora and blogs, and more recently from www.youtube.com....
Long term patterns in the late summer trophic niche of the invasive pumpkinseed...
Gkenas, Christos; Magalhães, M. F.; Cucherousset, J.; Domingos, Isabel; Ribeiro, FilipeQuantifying the trophic dynamics of invasive species in novel habitats is important for predicting the success of potential invaders and evaluating their ecological effects. The North American pumpkinseed sunfish Lepomis gibbosus is a successful invader in Europe, where it has caused negative ecological effects primarily through trophic interactions. Here, we quantified variations in the late summer trophic nic...