Evidence of early Holocene closed-basin conditions in the Huron-Georgian basins from within the North Bay outlet of the upper Great Lakes

Abstract

Sub-bottom profiling and coring were undertaken at eight sub-basins along the lower French

Conservation implications of revised genetic structure resulting from new population discovery: the threatened eastern sand darter (Ammocrypta pellucida) in Canada

“…The presence of shared and system-specific COI haplotypes suggests that recolonization and subsequent expansion likely originated with the common haplotype from a single glacial refugium, producing a radiation of systemspecific haplotypes arising in isolation. The current distribution of A. pellucida and the genetic relationships among their isolated populations are not entirely geographically consistent, most likely driven by dynamic changes in water levels and connectivity in the postglacial water bodies in the Erie and Ontario drainages during the Holocene (Brooks et al, 2012;Holcombe et al, 2003). The mtDNA parsimony network suggests a connection between Mississippian refugial populations (Ohio River) and at least one Great Lakes A. pellucida population, West Lake, since glaciation.…”

Early Holocene drought in the Laurentian Great Lakes basin caused hydrologic closure of Georgian Bay

“…3). Because of isostatic depression, the early gradient of the French River had been to the east (away from Georgian Bay) and was nearly level at the time of late Lake Hough (Brooks et al 2010). Thus much of the modern inflow from the French River would not have existed at this time, so in our model we removed all of the modern inflow from the French River (177 m 3 /s) to calculate the paleohydrology of late Lake Hough (Fig.…”

A Multi-Proxy Reconstruction of Environmental Change in the Vicinity of the North Bay Outlet of Pro-Glacial Lake Algonquin

“…BP and c. 9000-8400 cal. BP (Brooks & Medioli 2012;Brooks, Medioli & Telka 2012;. These two latter periods were separated by a large but probably short-lived melt-water pulse from palaeo-Lake Superior c. 9300 cal.…”