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Evaluating the range expansion of recreational non-native fishes in Portuguese freshwaters using scientific and citizen science data
Publication . Martelo, J.; Costa, L. M.; Ribeiro, D.; Gago, João; Magalhães, M. F.; Gante, H. F.; Alves, M. J.; Cheoo, G.; Gkenas, C.; Banha, F.; Gama, M.; Anastácio, P. M.; Tiago, P. M.; Ribeiro, F.
Updating 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 Silurus
glanis) and one rare, longer established (i.e., > 50 years), non-native (Esox lucius)
in Portugal. These species have been increasingly targeted by recreational fishermen,
thus likely expanding their distribution. Specifically, we obtained distribution maps
for each species, based on data gathered through a comprehensive search for records
in 1) scientific literature, 2) unpublished reports of research projects, and 3) citizen
science databases. We gathered 443 valid records, of which 64% were from citizen
science data, mainly provided by recreational fishermen. Data highlighted that all
species have expanded their distribution in the last 20 years, with high numbers of
new records for A. alburnus, S. lucioperca and S. glanis, mostly located in the
Tagus, Guadiana and Douro river basins. Changes in species distributions reflected
dispersal within invaded basins and colonisation of previously unoccupied drainages.
Integrating citizen science with scientific data provides an effective framework to
understand non-native species introduction and spread, stressing the need for
increasingly encourage and engage recreational fishermen in information sharing.
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Funding agency
Fundação para a Ciência e a Tecnologia
Funding programme
3599-PPCDT
Funding Award Number
PTDC/BIA-CBI/31644/2017