Episodes of low dissolved oxygen indicated by ostracodes and sediment geochemistry at Crystal Lake, Illinois, USA

Abstract

Low dissolved oxygen during the summer and early fall controls profundal continental ostracode distribution in Crystal Lake (McHenry County), Illinois, favoring Cypria ophthalmica and Physocypria globula at water depths from 6 to 13 m. These species also thrived in the lake's profundal zone from 14,165 to 9600 calendar year before present (cal yr B.P.) during the late Bølling, Allerød, and Younger Dryas chronozones, and early Holocene. Characterized by sand, cemented tubules, large aquatic gastropod shells, and littoral ostracode valves, thin (1-6 cm) tempestite deposits punctuate thicker deposits of organic gyttja from 16,080 to 11,900 cal yr B.P. The succeeding 2300 yr (11,900-9600 cal yr B.P.) lack tempestites, and reconstructed water depths were at their maximum. Deposition of marl under relatively well-oxygenated conditions occurred during the remainder of the Holocene until the arrival of Europeans, when the lake returned to a pattern of seasonally low dissolved oxygen. Such conditions are also indicated in the lake sediment by the speciation of phosphorus, high concentrations of organic carbon, and abundant iron and manganese occluded to mineral grains. Initial low dissolved oxygen was probably caused by the delivery of dissolved P and Fe in shallow groundwater, the chemistry of which was influenced by Spodosol pedogenesis under a spruce forest. The triggering may have been regionally warm and wet conditions associated with retreat of the Lake Michigan lobe (south-central Laurentide Ice Sheet).

Life histories and distribution of ostracods with depth in western Lake Geneva (Petit-Lac), Switzerland: a reconnaissance study

“…Delorme, 1978;Geiger, 1990a;Curry, 2010). Oxygen content measured for the water column of the Petit-Lac over the past halfcentury has always been relatively high (minimal value of 6.04 mg/1 CL for the 1957-2010SECOE;CDPEL, 2006CDPEL, , 2011. As oxygen content is high at all depth throughout the year, it is suggested that oxygen content plays less of a role on controlling the species distribution in the Petit-Lac.…”

Deglacial Hydroclimate of Midcontinental North America

“…In contrast, the deglacial hydroclimate is poorly understood. For example, geomorphic evidence and records from buried soils during the Younger-Dryas (YD) have been interpreted to suggest the midcontinent was drier for at least portions of the deglacial period (Campbell et al, 2011;Cordova et al, 2011;Dorale et al, 2010;Haynes, 1991;Holliday, 2000;Wang et al, 2012), while other evidence, based largely on inferences from pollen, has been interpreted to suggest this period was characterized by relatively greater moisture availability (Buhay et al, 2012;Curry and Filippelli, 2010;Curry et al, 2013;Grimm and Jacobson, 2004;Haynes, 2008;Mullins, 1998;Shuman et al, 2009;Webb and Bryson, 1972).…”

Land use and ostracod community structure

“…Other studies have found that larger candonids, particularly Candona (Candona) ohioensis, are often unable to complete their life cycles where seasonally low DO is significant (Curry & Filippelli, 2010). Contrary to the findings of Kitchell & Clark (1979), Curry & Filippelli (2010) noted post-European settlement decreases in Candona (Candona) ohioensis (Curry & Filippelli, 2010) in Crystal Lake, IL, which they attributed to seasonal anoxia driven by agricultural land use and lake development. Of the 12 lakes we studied, only one had a significant anoxia problem during late summer when we did our sampling (Big Twin Lake, Green Lake County).…”