Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes
Visualitza/Obre
Autor/a
Santos, Alejandra F. G. N.
Santos, Luciano N.
Hayashi, Carmino
García-Berthou, Emili
Data de publicació
2012-03-30ISSN
1679-6225
Resum
We experimentally examined the predator-prey relationships between juvenile spotted sorubim Pseudoplastystoma corruscans
and young-of-the-year invasive and native fish species of the Paraná River basin, Brazil. Three invasive (peacock bass Cichla
piquiti, Nile tilapia Oreochromis niloticus, and channel catfish Ictalurus punctatus) and two native (yellowtail tetra Astyanax
altiparanae and streaked prochilod Prochilodus lineatus) fish species were offered as prey to P. corruscans in 300 L aquaria
with three habitat complexity treatments (0%, 50% and 100% structure-covered). Prey survival was variable through time and
among species (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), depending largely on species-specific
prey behavior but also on prey size and morphological defenses. Habitat complexity did not directly affect P. corruscans
piscivory but some prey species changed their microhabitat use and shoaling behavior among habitat treatments in predator’s
presence. Pseudoplatystoma corruscans preyed preferentially on smaller individuals of those invasive species with weak
morphological defensive features that persisted in a non-shoaling behavior. Overall, our results contrast with those in a
companion experiment using a diurnal predator, suggesting that nocturnal piscivores preferentially prey on different (rather
diurnal) fish species and are less affected by habitat complexity. Our findings suggest that recovering the native populations
of P. corruscans might help controling some fish species introduced to the Paraná River basin, particularly C. piquiti and O.
niloticus, whose parental care is expected to be weak or null at night.
Tipus de document
Article
Versió del document
Versió publicada
Llengua
English
Matèries (CDU)
574 - Ecologia general i biodiversitat
Pàgines
10
Publicat per
Sociedade Brasileira de Ictiologia
Publicat a
Neotropical Ichthyology
Citació
Santos, Alejandra F.G.N., Carles Alcaraz, Luciano Neves Dos Santos, Carmino Hayashi, and Emili García‐Berthou. 2012. “Experimental Assessment of the Effects of a Neotropical Nocturnal Piscivore on Juvenile Native and Invasive Fishes.” Neotropical Ichthyology. 10 (1): 167–76. doi:10.1590/s1679-62252012000100016.
Número de l'acord de la subvenció
MEC/ /CGL2006-11652-C02-01/ES/EXITO INVASOR DE LA GAMBUSIA (GAMBUSIA HOLBROOKI): PLASTICIDAD ECOLOGICA/BOS
MICINN/Programa Nacional de Proyectos de Investigación Fundamental/ CGL2009-12877-C02-01/ES/ /
Programa
Aigües Marines i Continentals
Aquest element apareix en la col·lecció o col·leccions següent(s)
- ARTICLES CIENTÍFICS [2680]
Excepte que s'indiqui una altra cosa, la llicència de l'ítem es descriu com http://creativecommons.org/licenses/by-nc/4.0/