Invasive catfish in northern Italy and their impacts on waterbirds
Milardi, M., Green, A. J., Mancini, M., Trotti, P., Kiljunen, M., Torniainen, J., & Castaldelli, G. (2022). Invasive catfish in northern Italy and their impacts on waterbirds. NeoBiota, 72, 109-128. https://doi.org/10.3897/neobiota.72.80500
DisciplineMuseoResurssiviisausyhteisöAkvaattiset tieteetMuseumSchool of Resource WisdomAquatic Sciences
© Marco Milardi et al.
Predatory fish have occasionally been observed preying on birds, sometimes repeatedly, but few studies were able to unravel the overall significance of avian prey in fish diet and the predation impacts on bird populations. We used a control/impact study setup, using a Nature Reserve in northern Italy and a nearby control area, to determine: 1) the contribution of waterbirds to wels catfish diet in the Reserve, 2) the population density of wels catfish in the Reserve and control area and 3) the potential impacts of waterbird depredation by wels catfish on waterbird population trends. Our stable isotope Bayesian mixing model indicated that birds contributed 12.2% (5–27.9%, 50% confidence interval) of the diet of large wels catfish (> 98 cm in total length). Large individuals constituted the majority of the population in the shoreline areas of the reserve in 2013–2019, where the population was stable despite control efforts. Numbers were below detectable levels in the control area. Large wels catfish consumed an average of 224, 148 and 187 kg of birds during the 2019 chick growing period, as estimated through three different bioenergetic models. Compared to the control area, mallard reproductive success was diminished in the Reserve, likely due to higher rates of fish predation, although effects were variable in different years. Overall, our data suggest that high densities of invasive wels catfish might impact waterbird reproductive success through predation on bird chicks, but further studies would be needed to reduce uncertainties related to the intrinsic variability of field ecology data. Our study constitutes a preliminary attempt to assess the potential of introduced wels catfish to affect the conservation value of waterbird protection areas, and should be repeated at broader spatial and temporal scales. ...
ISSN Search the Publication Forum1314-2488
Publication in research information system
MetadataShow full item record
Additional information about fundingThis research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors.
Showing items with similar title or keywords.
European catfish (Silurus glanis) as a freshwater apex predator drives ecosystem via its diet adaptability Vejřík, Lukáš; Vejříková, Ivana; Blabolil, Petr; Eloranta, Antti P.; Kočvara, Luboš; Peterka, Jiří; Sajdlová, Zuzana; Chung, Son Hoang The; Šmejkal, Marek; Kiljunen, Mikko; Čech, Martin (Nature Publishing Group, 2017)Apex predators play a key role in ecosystem stability across environments but their numbers in general are decreasing. By contrast, European catfsh (Silurus glanis), the European freshwater apex predator, is on the ...
Lake size and fish diversity determine resource use and trophic position of a top predator in high-latitude lakes Eloranta, Antti; Kahilainen, Kimmo K.; Amundsen, Per-Arne; Knudsen, Rune; Harrod, Chris; Jones, Roger (JohnWiley & Sons Ltd., 2015)Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, ...
Supplementary data to: Genetic colour variation visible for predators and conspecifics is concealed from humans in a polymorphic moth Kirvesoja, Jimi; Nokelainen, Ossi; Suisto, Kaisa; Mappes, Johanna; Galarza Pavia, Juan (2022)The definition of colour polymorphism is intuitive: genetic variants express discretely-coloured phenotypes. This classification is however elusive as humans form subjective categories or ignore differences that cannot be ...
The Ghost of the Hawk : Top Predator Shaping Bird Communities in Space and Time Burgas, Daniel; Ovaskainen, Otso; Blanchet, F. Guillaume; Byholm, Patrik (Frontiers Media SA, 2021)Despite the wide recognition that strongly interacting species can influence distributions of other species, species interactions are often disregarded when assessing or projecting biodiversity distributions. In particular, ...
Complex effects of natural disasters on protected areas Virtanen, Pekka; Cristóvão, Luis; Mourinho, José (Routledge, 2022)It is now broadly recognised that in order to be sustainable, protected areas (PAs) must bring concrete benefits to local populations who suffer from the restrictions imposed for conservation. Natural disasters, such as ...