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Pleustonic communities with Lemnaceae in South America
Author(s) -
Landolt Elias
Publication year - 1999
Publication title -
applied vegetation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.096
H-Index - 64
eISSN - 1654-109X
pISSN - 1402-2001
DOI - 10.2307/1478876
Subject(s) - phytosociology , geography , ecology , forestry , biology , plant community , species richness
. Ca. 360 relevés of pleustonic vegetation were recorded in South America between 1983 and 1996.245 relevés, containing three or more pleustonic species, were classified according to the methods of Braun‐Blanquet. Within the class Lemnetea (minoris) the following two orders with alliances (All.) and associations (Ass.) can be distinguished: 1. Lemnetalia gibbae   All. Azollo filiculoides‐Lemnion gibbae Ass. Lemno minutae‐Lemnetum gibbae Azollo filiculoides‐Wolffielletum oblongae 2. Lemnetalia aequinoctialis   All. Salvinio minimae‐Lemnion minutae Ass. Lemno minutae‐Wolffielletum lingulatae   All. Salvinio minimae‐Lemnion aequinoctialis     Ass. Lemno aequinoctialis‐Wolffielletum lingulatae Lemno aequinoctialis‐Wolffielletum welwitschii   All. Woljfio columbianae‐Lemnion obscurae     Ass. Woljfio globosae‐Lemnetum obscurae The occurrence of the four alliances is mostly dependent on climate and geographical situation. The usefulness of creating pleustonic unities is discussed.

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