Mixedwood Plains
Encyclopedia
The Mixedwood Plains Ecozone is the Canadian ecozone
with the most southerly extent, covering all of southwestern Ontario
, and parts of central and northeastern Ontario and southern Quebec
along the Saint Lawrence River
. It is the smallest ecozone in Canada, but it includes the country's most productive industrial and commercial region, and is home to nearly half of Canada's population, including its two largest cities, Toronto
and Montreal
.
The corresponding Level I ecoregion of the United States Environmental Protection Agency system is the Eastern Temperate Forest ecoregion.
. At its western end, it encompasses all of Southwestern Ontario
, and is bounded by three Great Lakes
and their connecting waterway
s. To its north is Lake Huron
, and to the south Lake Erie
. Further east, it has boundaries with Lake Ontario
to the south and Lake Simcoe
to the north, before continuing east along a narrow strip of the Saint Lawrence River coast toward Quebec. It covers aproximetively 9% of the total surface of Canada.
Striking physiographic features distinctly contrast the typically flat or gentle sloping ecozone, the most prominent being the Niagara Escarpment
. Once controlling levels of meltwater
from glacial retreat during the last ice age, it now bifurcates the region from Niagara Falls
to the northern tip of the Bruce Peninsula
, then extends to Manitoulin Island
.
In south-central Ontario, the ecologically important and politically sensitive Oak Ridges Moraine
is a major feature of the Mixedwood Plains, with features such as rolling hills and the Happy Valley Forest representative of the ecozone. Due to the action of retreating glaciers, moraines are a common feature throughout this ecozone.
Some of the most fertile soil in Canada is located in this ecozone, in which the Holland Marsh
has come to be known as "Ontario's vegetable basket", and the Niagara Peninsula
is the most productive wine region in the country. Southwestern Ontario also represents the northern extent of the Carolinian forest
, an important habitat
for songbird
s.
It covers a geographic area of 175,963 km².
It consists of one ecoprovince
subdivided into four ecoregion
s: Saint Lawrence Lowlands
, Frontenac Axis
, Manitoulin-Lake Simcoe and the Lake Erie Lowland.
About 1.59% of the ecozone is protected, the smallest percentage amongst the terrestrial ecozones in Canada.
in this ecozone, which is in a major North American storm belt. Warm air fronts
from the Gulf of Mexico
and US south- and mid-west often collide with cold polar air mass
es, providing abundant precipitation
in some areas. Annually, the region receives between 720 and 1,000 mm of rain and snow.
Summers average about 22°C in July in the southwestern end of the zone, and 18°C in the northeast. Winters are much milder in the southwest, with mean January temperatures dipping to -3°C, whereas mean lows are -12°C in the northeast.
Because of the relatively mild climate, the region has become an important and productive agricultural
area. Agriculture has been the primary cause of deforestation
in the ecozone; it was once covered entirely by forests. The resultant loss of natural habitat
has caused a decline in the populations of many native species, and now over half of the Species at Risk in Canada are found in this zone.
with 5.5 million inhabitants and Montreal
with 3.4 million inhabitants.
species, among them white
and red pine
, oak
, elm
, maple
and birch
.. There are subdivided in Carolinian forest
, Great Lakes-St Lawrence forest, and they are related to the mixedwood of the Acadian Forest.
Ecozones of Canada
The ecozones of Canada consist of fifteen terrestrial and five marine ecozones in Canada. These are further subdivided into 53 ecoprovinces, 194 ecoregions, and 1021 ecodistricts...
with the most southerly extent, covering all of southwestern Ontario
Ontario
Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....
, and parts of central and northeastern Ontario and southern Quebec
Quebec
Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....
along the Saint Lawrence River
Saint Lawrence River
The Saint Lawrence is a large river flowing approximately from southwest to northeast in the middle latitudes of North America, connecting the Great Lakes with the Atlantic Ocean. It is the primary drainage conveyor of the Great Lakes Basin...
. It is the smallest ecozone in Canada, but it includes the country's most productive industrial and commercial region, and is home to nearly half of Canada's population, including its two largest cities, Toronto
Toronto
Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...
and Montreal
Montreal
Montreal is a city in Canada. It is the largest city in the province of Quebec, the second-largest city in Canada and the seventh largest in North America...
.
The corresponding Level I ecoregion of the United States Environmental Protection Agency system is the Eastern Temperate Forest ecoregion.
Geography
The Mixedwood Plains stretch along the Quebec City-Windsor corridorQuebec City-Windsor Corridor
Quebec City – Windsor Corridor is the most densely-populated and heavily-industrialized region of Canada. As its name suggests, it extends from Quebec City in the east to Windsor, Ontario in the west, spanning . With more than 18 million people, it contained 51% of the country's population and...
. At its western end, it encompasses all of Southwestern Ontario
Southwestern Ontario
Southwestern Ontario is a subregion of Southern Ontario in the Canadian province of Ontario, centred on the city of London. It extends north to south from the Bruce Peninsula on Lake Huron to the Lake Erie shoreline, and east to south-west roughly from Guelph to Windsor. The region had a population...
, and is bounded by three Great Lakes
Great Lakes
The Great Lakes are a collection of freshwater lakes located in northeastern North America, on the Canada – United States border. Consisting of Lakes Superior, Michigan, Huron, Erie, and Ontario, they form the largest group of freshwater lakes on Earth by total surface, coming in second by volume...
and their connecting waterway
Waterway
A waterway is any navigable body of water. Waterways can include rivers, lakes, seas, oceans, and canals. In order for a waterway to be navigable, it must meet several criteria:...
s. To its north is Lake Huron
Lake Huron
Lake Huron is one of the five Great Lakes of North America. Hydrologically, it comprises the larger portion of Lake Michigan-Huron. It is bounded on the east by the Canadian province of Ontario and on the west by the state of Michigan in the United States...
, and to the south Lake Erie
Lake Erie
Lake Erie is the fourth largest lake of the five Great Lakes in North America, and the tenth largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has the shortest average water residence time. It is bounded on the north by the...
. Further east, it has boundaries with Lake Ontario
Lake Ontario
Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north and southwest by the Canadian province of Ontario, and on the south by the American state of New York. Ontario, Canada's most populous province, was named for the lake. In the Wyandot language, ontarío means...
to the south and Lake Simcoe
Lake Simcoe
Lake Simcoe is a lake in Southern Ontario, Canada, the fourth-largest lake wholly in the province, after Lake Nipigon, Lac Seul, and Lake Nipissing. At the time of the first European contact in the 17th century the lake was called Ouentironk by the Huron natives...
to the north, before continuing east along a narrow strip of the Saint Lawrence River coast toward Quebec. It covers aproximetively 9% of the total surface of Canada.
Striking physiographic features distinctly contrast the typically flat or gentle sloping ecozone, the most prominent being the Niagara Escarpment
Niagara Escarpment
The Niagara Escarpment is a long escarpment, or cuesta, in the United States and Canada that runs westward from New York State, through Ontario, Michigan, Wisconsin and Illinois...
. Once controlling levels of meltwater
Meltwater
Meltwater is the water released by the melting of snow or ice, including glacial ice and ice shelfs over oceans. Meltwater is often found in the ablation zone of glaciers, where the rate of snow cover is reducing...
from glacial retreat during the last ice age, it now bifurcates the region from Niagara Falls
Niagara Falls
The Niagara Falls, located on the Niagara River draining Lake Erie into Lake Ontario, is the collective name for the Horseshoe Falls and the adjacent American Falls along with the comparatively small Bridal Veil Falls, which combined form the highest flow rate of any waterfalls in the world and has...
to the northern tip of the Bruce Peninsula
Bruce Peninsula
The Bruce Peninsula is a peninsula in Ontario, Canada that lies between Georgian Bay and the main basin of Lake Huron. The peninsula extends roughly northwestwards from the rest of Southern Ontario, pointing towards Manitoulin Island, with which it forms the widest strait joining Georgian Bay to...
, then extends to Manitoulin Island
Manitoulin Island
Manitoulin Island is a Canadian island in Lake Huron, in the province of Ontario. It is the largest island in a freshwater lake in the world. In addition to the historic Anishinaabe and European settlement of the island, archeological discoveries at Sheguiandah have demonstrated Paleo-Indian and...
.
In south-central Ontario, the ecologically important and politically sensitive Oak Ridges Moraine
Oak Ridges Moraine
The Oak Ridges Moraine is an ecologically important geological landform in the Mixedwood Plains of south-central Ontario, Canada. The moraine covers a geographic area of between Caledon and Rice Lake, near Peterborough...
is a major feature of the Mixedwood Plains, with features such as rolling hills and the Happy Valley Forest representative of the ecozone. Due to the action of retreating glaciers, moraines are a common feature throughout this ecozone.
Some of the most fertile soil in Canada is located in this ecozone, in which the Holland Marsh
Holland Marsh
The Holland Marsh is a wetland and agricultural area north of Toronto, Ontario. It lies entirely within the valley of the Holland River, stretching from the northern edge of the Oak Ridges Moraine near Schomberg to the river mouth at Cook's Bay, Lake Simcoe. In its entirety it comprises about or...
has come to be known as "Ontario's vegetable basket", and the Niagara Peninsula
Niagara Peninsula
The Niagara Peninsula is the portion of Southern Ontario, Canada lying between the south shore of Lake Ontario and the north shore of Lake Erie. It stretches from the Niagara River in the east to Hamilton, Ontario in the west. The population of the peninsula is roughly 1,000,000 people...
is the most productive wine region in the country. Southwestern Ontario also represents the northern extent of the Carolinian forest
Carolinian forest
The Carolinian forest is a life zone in eastern North America characterized primarily by a predominance of deciduous, or broad-leaf trees. The term "Carolinian forest" is used primarily in Canada...
, an important habitat
Habitat
* Habitat , a place where a species lives and grows*Human habitat, a place where humans live, work or play** Space habitat, a space station intended as a permanent settlement...
for songbird
Songbird
A songbird is a bird belonging to the suborder Passeri of the perching birds . Another name that is sometimes seen as scientific or vernacular name is Oscines, from Latin oscen, "a songbird"...
s.
It covers a geographic area of 175,963 km².
It consists of one ecoprovince
Ecoprovince
An ecoprovince is a biogeographic unit smaller than an ecozone that contains one or more ecoregions. According to Demarchi , an ecoprovince encompasses areas of uniform climate, geological history and physiography . Their size and broad internal uniformity make them ideal units for the...
subdivided into four ecoregion
Ecoregion
An ecoregion , sometimes called a bioregion, is an ecologically and geographically defined area that is smaller than an ecozone and larger than an ecosystem. Ecoregions cover relatively large areas of land or water, and contain characteristic, geographically distinct assemblages of natural...
s: Saint Lawrence Lowlands
Saint Lawrence Lowlands
The St. Lawrence Lowlands is an ecoregion of Mixedwood Plains and a physiographic region of Canada and the United States. It is sometimes named the "Great Lakes/St. Lawrence Lowlands", but that name improperly includes the Great Lakes Basin which, while it might drain to the Atlantic Ocean by way...
, Frontenac Axis
Frontenac Axis
The Frontenac Axis is an exposed strip of Precambrian rock in Canada and the United States which links the Canadian Shield with the Adirondack mountain range in New York, an extension of the Laurentian mountains of Québec. The axis separates the St. Lawrence Lowlands and the Great Lakes Lowlands....
, Manitoulin-Lake Simcoe and the Lake Erie Lowland.
Protected areas
Within this ecozone are a number of protected areas. These include:- Bruce Peninsula National ParkBruce Peninsula National ParkBruce Peninsula National Park is a national park on the Bruce Peninsula in Ontario, Canada. Located on a part of the Niagara Escarpment, the park comprises 156 square kilometres and is one of the largest protected areas in southern Ontario, forming the core of UNESCO's Niagara Escarpment World...
- Georgian Bay Islands National ParkGeorgian Bay Islands National ParkGeorgian Bay Islands National Park consists of 63 small islands or parts of islands in Georgian Bay, near Port Severn, Ontario. The park was established in 1929. The total park area is approximately 13.5 km²...
- Point Pelee National ParkPoint Pelee National Park-See also:*National Parks of Canada*List of National Parks of Canada*Long Point-External links:**...
- St. Lawrence Islands National ParkSt. Lawrence Islands National ParkSt. Lawrence Islands National Park is located in the Thousand Islands Region of the Saint Lawrence River. The islands are actually the worn-down tops of ancient mountains...
About 1.59% of the ecozone is protected, the smallest percentage amongst the terrestrial ecozones in Canada.
Climate
The climate of the Mixedwood Plains is characterised by warm to hot summers and cool winters. The Great Lakes and Saint Lawrence River have a significant moderating effectContinentality
Continentality is the tendency of land to experience more thermal variation than water, due to the land's lower specific heat capacity. Continental climate also tends to be dryer than oceanic climate as there is less moisture input to the atmosphere from evaporation...
in this ecozone, which is in a major North American storm belt. Warm air fronts
Warm front
A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient...
from the Gulf of Mexico
Gulf of Mexico
The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...
and US south- and mid-west often collide with cold polar air mass
Air mass
In meteorology, an air mass is a volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of square miles, and adopt the characteristics of the surface below them. They are classified according to latitude and their continental or maritime...
es, providing abundant precipitation
Precipitation (meteorology)
In meteorology, precipitation In meteorology, precipitation In meteorology, precipitation (also known as one of the classes of hydrometeors, which are atmospheric water phenomena is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation...
in some areas. Annually, the region receives between 720 and 1,000 mm of rain and snow.
Summers average about 22°C in July in the southwestern end of the zone, and 18°C in the northeast. Winters are much milder in the southwest, with mean January temperatures dipping to -3°C, whereas mean lows are -12°C in the northeast.
Because of the relatively mild climate, the region has become an important and productive agricultural
Agriculture
Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...
area. Agriculture has been the primary cause of deforestation
Deforestation
Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a nonforest use. Examples of deforestation include conversion of forestland to farms, ranches, or urban use....
in the ecozone; it was once covered entirely by forests. The resultant loss of natural habitat
Habitat
* Habitat , a place where a species lives and grows*Human habitat, a place where humans live, work or play** Space habitat, a space station intended as a permanent settlement...
has caused a decline in the populations of many native species, and now over half of the Species at Risk in Canada are found in this zone.
Population
Mixedwood Plains is the most populated ecozone in Canada, with 15 631 830 inhabitants and counting. That is about half of the country's total population. 13 of 25 major cities in Canada are found in this ecozone, including TorontoToronto
Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...
with 5.5 million inhabitants and Montreal
Montreal
Montreal is a city in Canada. It is the largest city in the province of Quebec, the second-largest city in Canada and the seventh largest in North America...
with 3.4 million inhabitants.
Forest
The forests that remain in this zone still boast Canada's greatest diversity of treeTree
A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...
species, among them white
Eastern White Pine
Pinus strobus, commonly known as the eastern white pine, is a large pine native to eastern North America, occurring from Newfoundland west to Minnesota and southeastern Manitoba, and south along the Appalachian Mountains to the northern edge of Georgia.It is occasionally known as simply white pine,...
and red pine
Red Pine
Pinus resinosa, commonly known as the red pine or Norway pine, is pine native to North America. The Red Pine occurs from Newfoundland west to Manitoba, and south to Pennsylvania, with several smaller, disjunct populations occurring in the Appalachian Mountains in Virginia and West Virginia, as well...
, oak
Oak
An oak is a tree or shrub in the genus Quercus , of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus...
, elm
Elm
Elms are deciduous and semi-deciduous trees comprising the genus Ulmus in the plant family Ulmaceae. The dozens of species are found in temperate and tropical-montane regions of North America and Eurasia, ranging southward into Indonesia. Elms are components of many kinds of natural forests...
, maple
Maple
Acer is a genus of trees or shrubs commonly known as maple.Maples are variously classified in a family of their own, the Aceraceae, or together with the Hippocastanaceae included in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favour inclusion in...
and birch
Birch
Birch is a tree or shrub of the genus Betula , in the family Betulaceae, closely related to the beech/oak family, Fagaceae. The Betula genus contains 30–60 known taxa...
.. There are subdivided in Carolinian forest
Carolinian forest
The Carolinian forest is a life zone in eastern North America characterized primarily by a predominance of deciduous, or broad-leaf trees. The term "Carolinian forest" is used primarily in Canada...
, Great Lakes-St Lawrence forest, and they are related to the mixedwood of the Acadian Forest.