期刊
HYDROBIOLOGIA
卷 737, 期 1, 页码 67-76出版社
SPRINGER
DOI: 10.1007/s10750-013-1800-6
关键词
Fluvial lakes; Airborne data; APEX images; Macrophyte growth forms; Phytoplankton
资金
- CLAM-PHYM [ASI I/015/11/0]
- CLAM-PHYM (science and technological cooperation between Italy and the Kingdom of Sweden, Ministero dell'Istruzione, dell'Universita e della Ricerca) [ASI I/015/11/0]
- Emilia-Romagna Region [measure 323-PSR 2007/2013, CUP E34l11000030006-CIG. N.2560368283]
- Mincio Regional Park (project: Definition of the Minimal Vital Flow of the Mincio River)
We investigated with remote sensing (APEX images) the coexistence of phytoplankton and macrophytes in three interconnected shallow and hypereutrophic fluvial lakes (Mantua Lakes, Northern Italy). High concentrations of chlorophyll-a, up to 60 mg m(-3), were determined in the open water between well-developed stands of floating-leaved, submerged, and emergent macrophytes. Our data suggest a general inhibition of phytoplankton by macrophytes, evidenced by decreasing chlorophyll-a concentrations in proximity of macrophyte stands. Chlorophyll-a concentrations halved in the proximity of emergent stands (similar to 6 mg m(-3) within 21 m from the stand border) when compared to the outer zones (similar to 13 mg m(-3)). Contrasting trends were observed for submerged stands, where concentrations decreased inwards from similar to 8 to similar to 3 mg m(-3). Floating leaved stands had a neutral effect, chlorophyll-a being nearly constant in both inner and outer zones. Overall, remotely-sensed data allow evaluation of quantitative and spatially defined interactions of macrophytes and phytoplankton at the whole ecosystem scale.
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