Thousand Islands – Frontenac Arch Thousand Islands – Frontenac Arch The Thousand Islands – Frontenac Arch region or the Frontenac Axis is an exposed strip of Precambrian rock in Canada and the United States that links the Canadian Shield from Algonquin Park with the Adirondack Mountain region in New York, an extension of the Laurentian mountains of Québec. The Algonquin to Adirondacks region, which includes the Frontenac Axis or Arch, is a critical linkage for biodiversity and resilience, and one with important conservation potential. The axis separates the St. Lawrence Lowlands and the Great Lakes Lowlands. It has many distinctive plant and animal species. It
North American river otter spp.), daces ("Rhinichthys" spp.), shiners ("Notropis" and "Richardsonius" spp.), and squawfishes ("Ptychocheilus" spp.); and Ictaluridae, which consists of bullheads and catfish ("Ictalurus" spp.). Other fish an integral part of the North American river otters' diets are those that are often plentiful and found in large schools: sunfish ("Lepomis" spp.); darters ("Etheostoma" spp.); and perches ("Perca" spp.). Bottom-dwelling species, which have the tendency to remain immobile until a predator is very close, are susceptible to North American river otters. These include mudminnows ("Umbra limi") and sculpins ("Cottus" spp.). Game fish, such as trout (Salmonidae) and pike (Esocidae), are not a significant