Dramatic changes in a phytoplankton community in response to local and global pressures: a 24-year survey of the river Loire (France).

Abstract:

:The impact of climate change and of other anthropogenic pressures on the structure and composition of phytoplankton communities of large European rivers remains poorly documented. Here we report the findings of a study of the changes in the phytoplankton community of the middle segment of the river Loire over the past 24 years. An attempt is made to distinguish between the impact of changes acting at the local scale and that of those acting more globally. A dramatic reduction in phytoplankton abundance was observed, particularly in the mid -1990s; this was concomitant with an increase in the relative proportion of cyanobacteria. At the same time, the phytoplankton community displayed increasing richness and diversity, and little change in its size structure. All these changes seem to be related to local changes, in particular to the reduction in phosphorus concentrations, as well as to changes in climate, throughout modifications in the river discharge and water temperature. Interestingly, herbicide contamination also appeared to be of particular importance in explaining the unexpected increase in the proportion of cyanobacteria in the phytoplankton community after the 1990s. These findings suggest that combinations of numerous anthropogenic pressures acting at different spatial and temporal scales have led to a mix of predictable and unpredictable changes occurring in the phytoplankton community of the river Loire, with probable consequences for the trophic networks in this river.

journal_name

Glob Chang Biol

journal_title

Global change biology

authors

Larroudé S,Massei N,Reyes-Marchant P,Delattre C,Humbert JF

doi

10.1111/gcb.12139

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

1620-31

issue

5

eissn

1354-1013

issn

1365-2486

journal_volume

19

pub_type

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