title: [Hirudinea fauna of the lower segment of the river Biebrza and its old beds].
mesh_terms: D000818:Animals; D005618:Fresh Water; D007865:Leeches / Q000302:isolation & purification*; D011044:Poland; D011156:Population Density
vernacular_title: Fauna Hirudinea środkowego i dolnego odcinka rzeki Biebrzy i jej starorzeczy.