Effects of bottom-up and top-down controls on the temporal distribution of planktonic heterotrophic nanoflagellates are dependent on water depth

Autor:	Luis Mauricio Bini, Bianca Trevizan Segovia, Luiz Felipe Machado Velho, Danielle Goeldner Pereira
Rok vydání:	2014
Předmět:	Water depth geography geography.geographical_feature_category Floodplain Ecology Parana river Heterotroph Dominance (ecology) Aquatic Science Plankton Biology Shallow lake Predation
Zdroj:	Hydrobiologia. 736:155-164
ISSN:	1573-5117 0018-8158
Popis:	We evaluated the relative importance of bottom-up and top-down mechanisms in controlling the density of a heterotrophic nanoflagellate (HNF) community in a shallow lake (Guarana Lake) on the Parana River floodplain (State of Mato Grosso do Sul, Brazil). Samples were taken monthly from March 2007 through February 2008, in three strata (surface, middle and bottom). Bacterial and cladoceran densities were the variables most associated with HNF density. However, there was a gradual decoupling between HNF and bacteria from the subsurface to the bottom of the lake. Most likely, this was caused by high predation by cladocerans on HNF in the deeper layer. Our results suggest that the overwhelming dominance of a single type of control on HNF dynamics may be more the exception than the rule.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a8b6981d807bb3775f61fd5fe663cfef https://doi.org/10.1007/s10750-014-1904-7 Zobrazit plný text záznamu Plný text ve formátu PDF