The use of dinoflagellate cysts to separate human-induced from natural variability in the trophic state of the Po River discharge plume over the last two centuries.

Abstract:

:To obtain insight into the natural and/or human-induced changes in the trophic state of the distal portion of the Po River discharge plume over the last two centuries, high temporal resolution dinoflagellate cyst records were established at three sites. Cyst production rates appear to reflect the natural variability in the river's discharge, whereas cyst associations reflect the trophic state of the upper waters, which in turn can be related to agricultural development. The increased abundances of Lingulodinium machaerophorum and Stelladinium stellatum found as early as 1890 and 1920 correspond to the beginning of the industrial revolution in Italy and the first chemical production and dispersion of ammonia throughout Europe. After 1955, the increased abundances of these species and of Polykrikos schwartzii, Brigantedinium spp. and Pentapharsodinium dalei correspond to agriculturally induced alterations of the hypertrophic conditions. A slight improvement in water quality can be observed from 1987 onward.

journal_name

Mar Pollut Bull

authors

Zonneveld KAF,Chen L,Elshanawany R,Fischer HW,Hoins M,Ibrahim MI,Pittauerova D,Versteegh GJM

doi

10.1016/j.marpolbul.2011.10.012

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

114-132

issue

1

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(11)00552-2

journal_volume

64

pub_type

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