Abstract
Eutrophication processes were closely examined in a hypertrophic pond that was subjected to a barley straw treatment to inhibit cyanobacteria blooms. A phytoplankton activity was present from February to November 2010 with Chlorophyll a concentrations that ranged between 8 and 83 μg L-1 . The good oxygenation of the pond provided by primary production all along the year seems to maintain an oxic layer at the top of the sedimentary column. A high-frequency monitoring of algal development pointed out the end of the diatom bloom at the end of April and the growth of green algae from beginning of May. One month later, the development of cyanobacteria supplanted other algae several times. The implementation of barley straw does not seem to hinder the growth of cyanobacteria in June, August and September and do not promote the development of other algae potentially favoured by such a treatment. As a consequence, a barley straw treatment does not seem to be really appropriate for this kind of ponds in Northern France and more tests should still be undertaken to prove its real efficiency.
Highlights
Subm4i6ttVedan1e6mOuicste. s2t0r.1,25;1a0c1c4epTtaerdtu3,0EAstporn.ia2013 3, 8Institute of Microbiology and Biotechnology, University of Latvia, 4 Kronvalda blvd., Abstract
Cyanobacteria blooms were noticed for the first time in the 1990s
Small and shallow floodplain ponds are very reactive environments characterised by intense exchanges between sediments, interstitial water JJoouurrnnaalloof fEnEvnivroirnomnmenetnatlaElnEginngeienreinerginagndaLndanLdascnadpsecaMpaenMageamnaegnet,m2e0n1t4,22021(14),:212–(113): 1Á13 and open water. This kind of pond is very common in Northern France and large and specific attention has been paid to this problem because of phytoplankton developments and harmful cyanobacteria blooms, which have consequences both on aquatic environments and water usage
Summary
Subm4i6ttVedan1e6mOuicste. s2t0r.1,25;1a0c1c4epTtaerdtu3,0EAstporn.ia2013 3, 8Institute of Microbiology and Biotechnology, University of Latvia, 4 Kronvalda blvd., Abstract. S2t0r.1,25;1a0c1c4epTtaerdtu3,0EAstporn.ia2013 3, 8Institute of Microbiology and Biotechnology, University of Latvia, 4 Kronvalda blvd., Abstract. Eutrophication processes were closelyLeVxa-m15in8e6dRinigaah,yLpaerttvrioaphic pond that was subjected to a barley straw treatment to4, 5in, 6hIinbsittictyuatneoobfacFtoeorida bSlaofoemtys,. Anpihmyatol pHlaenakltohnaancdtivEitnyviwroasnmpreensetn(tBfrIoOmRF)e,b3ruLareyjutpoeNs ostvre.,mber 2010 with Chlorophyll a concentrations that ranged bLeVtw-1ee0n768 aRnidga8,3LmgatLvi(a1. The good oxygenation of the pond provided by primary production all alongStuhbemyeitatredsee6mMs taor.m2a0in1t2a;inacacnepoxteicdla1y4erAautgt.he20to1p2 of the sedimentary column. A high-frequency monitoring of algal development pointed out the end of the diatom bloom at the end of April and the gaArlgobawsettrhsaecvotef.rgTarlreiteninmitreaosl.gtoTalehueferniomemp(TlbeeNmgTienn)n,taiantigocnoofmoMfmbaoaynr.llOyeynusestermdawoendxtpohleolsastnievore,t tsfhoeeermdmetvioleitlhoairpnymdeaernntdthoeifngdcryouawsnttrohiabolafcactpeyprailnaicosabutiapocpntlesa,rniacteaidnn oJcutahnueesr,e. EfennviurgornemekentcaulltEivnagtiinoenerdinigd annodt LsiagnndisfcicaapnetlMy aanffaegcetmtehnet T22N(1T): d1eÁg1r3a.dhattipo:n//drxa.tde.oiT.ohreg/r1e0s.u3l8t4s6f/r1o6m486m89o7le.2cu01la3r.8a0n1a8l4y7ses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Httcpa:n//dxr.edsouil.ot rgi/n10.a38lg4a6l/1648t6e8m97p.2e0ra1t2u.7r2e1, 7t8r4ansparency and residence time) (Khan, proliferations, and cyanobacteria blooms Ansari 2005). SCuocnhatsrarAyntaobabeinoare, mAepdhiaatnioiznomteecnhonno,loCgiyelsinudsrinosgpbearcmteorpiasios,r NboiodauulagrmiaenatnadtioNno,stofcunargealablbeiotoreamsseidmiailtaioten N2re(qPuaierrels eatnal.e2x0s0i6tu).approach instead of in situ treatment (i.e. soil Siesveeraxlcavparteevde,ntihvoemaocgteinoinssedanadndcusruaptipvleemterneatet-d mweitnhtsn, uitnrcielundtsin) g(Btahlderiraendu2c0t0io8n).
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