![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer conservation divers for NABU, stand next to Michael Kellner, federal manager and Brandenburg's top candidate for the Green Party, 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer conservation divers for NABU, stand next to Michael Kellner, federal manager and Brandenburg's top candidate for the Green Party,](https://c8.alamy.com/zooms/6/961767c0be0246509111c5364d10f589/2ghme0y.jpg)
07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer conservation divers for NABU, stand next to Michael Kellner, federal manager and Brandenburg's top candidate for the Green Party,
![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the](https://l450v.alamy.com/450v/2ghmat6/07-september-2021-brandenburg-neuruppinot-ghlen-glienicke-michael-kellner-l-federal-manager-and-brandenburgs-top-candidate-for-the-green-party-talks-to-silke-oldorff-and-david-wortmann-r-nabu-volunteer-conservation-divers-on-the-shores-of-the-kalksee-in-binenwalde-the-40-hectare-spring-lake-measures-about-22-metres-at-its-deepest-point-and-is-located-in-the-ruppiner-schweiz-nature-reserve-the-divers-examined-the-condition-of-the-water-on-the-basis-of-its-underwater-vegetation-arm-candy-algae-nixwort-and-rough-hornwort-grow-on-the-bottom-but-also-pond-mussels-and-zebra-mussel-2ghmat6.jpg)
07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the
![Pflanzen im Süßwasser - Oldorff, Silke; Krautkrämer, Volker; Kirschey, Tom: 9783440154465 - AbeBooks Pflanzen im Süßwasser - Oldorff, Silke; Krautkrämer, Volker; Kirschey, Tom: 9783440154465 - AbeBooks](https://pictures.abebooks.com/isbn/9783440154465-us.jpg)
Pflanzen im Süßwasser - Oldorff, Silke; Krautkrämer, Volker; Kirschey, Tom: 9783440154465 - AbeBooks
![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the](https://l450v.alamy.com/450v/2ghm7af/07-september-2021-brandenburg-neuruppinot-ghlen-glienicke-silke-oldorff-and-david-wortmann-r-volunteer-nature-conservation-divers-from-nabu-come-out-of-the-water-after-their-dive-during-the-visit-of-green-party-managing-director-kellner-to-kalksee-in-binenwalde-the-40-hectare-spring-lake-measures-about-22-metres-at-its-deepest-point-and-is-located-in-the-ruppiner-schweiz-nature-reserve-the-divers-examined-the-condition-of-the-water-on-the-basis-of-its-underwater-vegetation-arm-candy-algae-nixwort-and-rough-hornwort-grow-on-the-bottom-but-also-pond-mussels-and-zebra-mussels-the-k-2ghm7af.jpg)
07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the
![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the](https://l450v.alamy.com/450v/2ghme14/07-september-2021-brandenburg-neuruppinot-ghlen-glienicke-michael-kellner-l-federal-manager-and-brandenburgs-top-candidate-for-the-green-party-talks-to-silke-oldorff-and-david-wortmann-r-nabu-volunteer-conservation-divers-on-the-shores-of-the-kalksee-in-binenwalde-the-40-hectare-spring-lake-measures-about-22-metres-at-its-deepest-point-and-is-located-in-the-ruppiner-schweiz-nature-reserve-the-divers-examined-the-condition-of-the-water-on-the-basis-of-its-underwater-vegetation-arm-candy-algae-nixwort-and-rough-hornwort-grow-on-the-bottom-but-also-pond-mussels-and-zebra-mussel-2ghme14.jpg)
07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the
![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the](https://c8.alamy.com/comp/2GHME12/07-september-2021-brandenburg-neuruppinot-ghlen-glienicke-silke-oldorff-and-david-wortmann-r-volunteer-nature-conservation-divers-from-nabu-stand-in-the-water-after-diving-in-the-kalksee-lake-in-binenwalde-during-the-visit-by-green-party-managing-director-kellner-the-40-hectare-spring-lake-measures-about-22-metres-at-its-deepest-point-and-is-located-in-the-ruppiner-schweiz-nature-reserve-the-divers-examined-the-condition-of-the-water-on-the-basis-of-its-underwater-vegetation-arm-candy-algae-nixwort-and-rough-hornwort-grow-on-the-bottom-but-also-pond-mussels-and-zebra-mussels-the-2GHME12.jpg)
07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, stand in the water after diving in the Kalksee lake in Binenwalde during the
![07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, go diving in the water during the visit of Green Party managing director Kellner 07 September 2021, Brandenburg, Neuruppin/Ot Gühlen-Glienicke: Silke Oldorff and David Wortmann (r), volunteer nature conservation divers from NABU, go diving in the water during the visit of Green Party managing director Kellner](https://c8.alamy.com/comp/2GHM7AK/07-september-2021-brandenburg-neuruppinot-ghlen-glienicke-silke-oldorff-and-david-wortmann-r-volunteer-nature-conservation-divers-from-nabu-go-diving-in-the-water-during-the-visit-of-green-party-managing-director-kellner-to-kalksee-in-binenwalde-the-40-hectare-spring-lake-measures-about-22-metres-at-its-deepest-point-and-is-located-in-the-ruppiner-schweiz-nature-reserve-the-divers-examined-the-condition-of-the-water-on-the-basis-of-its-underwater-vegetation-arm-candy-algae-nixwort-and-rough-hornwort-grow-on-the-bottom-but-also-pond-mussels-and-zebra-mussels-the-kalksee-was-consi-2GHM7AK.jpg)