Transition of a lake to turbid state six years after biomanipulation: Mechanisms and pathways
1995; Pergamon Press; Volume: 32; Issue: 4 Linguagem: Inglês
10.1016/0273-1223(95)00699-0
ISSN1996-9732
Autores Tópico(s)Freshwater macroinvertebrate diversity and ecology
ResumoSix years after application of biomanipulation in 1987, Lake Zwemlust (The Netherlands) returned during the summer from a clear water state dominated by aquatic vegetation to a turbid state characterized by high algal biomass. Herbivory and growth of epiphytes on macrophytes were the main factors triggering the switch. Selective herbivory by coots ( Fulica atra ) and rudd ( Scardinius erythrophthalmus ) caused a change in macrophyte species composition from a dominance of Elodea nuttallii in 1988/1989 to Ceratophyllum demersum in 1990/1991, and finally to Potamogeton berchtholdii in 1992/1993/1994. Observations revealed a general lack of epiphytes associated with Elodea and Ceratophyllum , while Potamogeton showed a progressive coverage with epiphytes, causing Potamogeton to decline markedly during late summer. Phytoplankton blooms, dominated by cyanobacteria, appeared again during three consecutive autumns, 1992, 1993 and 1994, with chlorophyll-α concentrations reaching 60-240 μg 1−1.
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