Long‐term changes in communities of native coccinellids: population fluctuations and the effect of competition from an invasive non‐native species

摘要: 1. We assessed the changes in abundance and community composition of native species coccinellids (Coleoptera: Coccinellidae) on deciduous trees that occurred between 1970s 2010s, Czech Republic. 2. As adult communities varies with host plant season, were sampled May–June from Acer, Betula Tilia using a standardised sweeping method. This was done before (1976–1986) after (2011–2014) arrival Harmonia axyridis 2006, interim samples period immediately it arrived Republic (2002–2006). 3. Twenty-one identified total sample 2674 adults. The Adalia bipunctata, Coccinella quinquepunctata Propylea quatuordecimpunctata decreased over whole sampled. Declines these already evident prior to H.axyridis. Recent declines decempunctata Calvia quatuordecimguttata followed H. axyridis. Their increasing axyridis, but following its invasion latter might have affected their decline. only one species, decemguttata, increased. Although many frequency some varied, diversity coccinellid populations (Shannon index) similar 40 years this study. 4. can part be attributed axyridis, the role other factors (e.g. climate change, habitat degradation) long-term fluctuations should considered future assessments.