Chemical, biological, and trophic status of temperate lakes can be strongly influenced by the presence of late-glacial marine sediments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000340" target="_blank" >RIV/00025798:_____/19:00000340 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.tandfonline.com/doi/abs/10.1080/10402381.2019.1669747" target="_blank" >https://www.tandfonline.com/doi/abs/10.1080/10402381.2019.1669747</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/10402381.2019.1669747" target="_blank" >10.1080/10402381.2019.1669747</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chemical, biological, and trophic status of temperate lakes can be strongly influenced by the presence of late-glacial marine sediments

Popis výsledku v původním jazyce

Lake Auburn, Maine, is a water supply for 60,000 people. Unusual silt/clay sediment, >4m thick, occurs 15 cm below gyttja in deep water cores. We characterized cores taken in 2015 and 2016 (57 and 425cm long, respectively), from 35m. We determined 137Cs, 210Pb, and 206P/204Pb ratios to establish chronology for the cores and to link them stratigraphically. At least 1.1m of sediment has accumulated since European settlement due to watershed erosion from land clearance and disturbance from about 1750 onward. The increased lake level from dams established in 1851 and the 1950–1960s has caused shoreline erosion. Extraction of sediment with HCl, scanning electron microscopy, and energy-dispersive spectroscopy analyses confirmed the presence of apatite (Ca5(PO4)3(OH)) for at least the upper 3.5m of sediment. The apatite is soluble because of the circumneutral pH and relatively low Ca2þ concentrations. This modern sediment is derived from postglacial marine silt/clay sediment and represents a rarely considered internal source of P that predisposes the lake’s water column to higher total P, rendering it more susceptible to episodic eutrophication from stresses including higher temperatures, more frequent high-intensity weather phenomena, and longer ice-free periods with stronger and longer stratification. This previously unrecognized source of P must be considered in water quality management, including chemical mitigation such as aluminum addition, lake level manipulation, and watershed erosion control. Similar situations likely exist in other coastal lakes in postglacial terrain that was inundated during deglaciation, and in inland lakes receiving sediment directly during deglaciation.

Název v anglickém jazyce

Chemical, biological, and trophic status of temperate lakes can be strongly influenced by the presence of late-glacial marine sediments

Popis výsledku anglicky

Lake Auburn, Maine, is a water supply for 60,000 people. Unusual silt/clay sediment, >4m thick, occurs 15 cm below gyttja in deep water cores. We characterized cores taken in 2015 and 2016 (57 and 425cm long, respectively), from 35m. We determined 137Cs, 210Pb, and 206P/204Pb ratios to establish chronology for the cores and to link them stratigraphically. At least 1.1m of sediment has accumulated since European settlement due to watershed erosion from land clearance and disturbance from about 1750 onward. The increased lake level from dams established in 1851 and the 1950–1960s has caused shoreline erosion. Extraction of sediment with HCl, scanning electron microscopy, and energy-dispersive spectroscopy analyses confirmed the presence of apatite (Ca5(PO4)3(OH)) for at least the upper 3.5m of sediment. The apatite is soluble because of the circumneutral pH and relatively low Ca2þ concentrations. This modern sediment is derived from postglacial marine silt/clay sediment and represents a rarely considered internal source of P that predisposes the lake’s water column to higher total P, rendering it more susceptible to episodic eutrophication from stresses including higher temperatures, more frequent high-intensity weather phenomena, and longer ice-free periods with stronger and longer stratification. This previously unrecognized source of P must be considered in water quality management, including chemical mitigation such as aluminum addition, lake level manipulation, and watershed erosion control. Similar situations likely exist in other coastal lakes in postglacial terrain that was inundated during deglaciation, and in inland lakes receiving sediment directly during deglaciation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Lake and Reservoir Management

ISSN

1040-2381

e-ISSN

—

Svazek periodika

36

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

14-30

Kód UT WoS článku

000494410800001

EID výsledku v databázi Scopus

2-s2.0-85074868217