Table 1. Regional flyway populations and annual trends (after Nagy, Flink & Langendoen, 2014) for seven species of waterbirds using the Odra River Estuary.

Speciesa	Functional groupb	Number of individuals (1992)c	Number of individuals (2012)d	Population trend % p.a.e	Significance of changesf
Greater Scaup	B	300	150	−3.57	Large decline
Common Pochard	B	280	150	−3.35	Large decline
Tufted Duck	B	1,100	820	−0.98	Large decline
Goosander	P	130	100	−0.09	Stable
Eurasian Coot	B	990	950	+0.19	Moderate increase
Common Goldeneye	B	210	240	+0.26	Moderate increase
Smew	P	13	24	+1.97	Large increase

Notes.

^aTarget species.

^bFunctional group: B, bottom-feeders, P, piscivores.

^cEstimated number of individuals from regional flyway population in 1992, the numbers are presented in thousands.

^dEstimated number of individuals from regional flyway population in 2012, the numbers are presented in thousands.

^ePopulation trend % per annum - long term assessment.

^fSignificances of changes.