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CREDIT RIV

ER

SEC

ON

D

LIN

E

WEST

CRR1

CRR2SMA

MV12

CRR2SMA

CRR2

FOD8-1

MAM2-10

FOD7-3

CUP3-9

OLD DERRY ROAD

DERRY ROAD WEST

FOD7-3

OAO

MAM2-10

FOD5-1

CUP3

FOD7-3MAM2-10

OAO

FOD7-3

MAM2-10

Manicured

FOD7-3

MAM2-10

FOD5-1

FOD7-3

FOD7-3

MAM2-10

OAO

FOD7-3

FOD7-3

MAM2-10

CUM1-1

CUP3CUM1-1

SAM1-4

FOD7-3FOD5-1

CUM1-1

MAM2-10

FOD7-3

MAM2-10

MAM2-10

OAO

SWD4-1

FOD7-3

MAM2-10

FOD7-3SWD3-4

FOD2-4

CUP3

FOD7-3

CUM1-1

CUM1-1

CRR1S

MA

CUM1-1

CRR1

0

metres

NATURAL AREAS

VEGETATION COMMUNITIES

SPECIAL MANAGEMENT AREAS

LINKAGES

NATURAL AREAS SYSTEM CLASSIFICATION

N

SITE CRR1

30 60 90 120

2019 NATURAL AREAS UPDATE

SAS1/MAS2-1

MAM2-2

CUM/CUT

FOD4-2/CUW

CUM1-1

A R E A S S Y S T E M

Page 2: Natural Areas Survey (NAS) Site: CRR1 · SAS1/MAS2-1 MAM2-2 CUM/CUT FOD4-2/CUW CUM1-1 A R E A S S Y S T E M. City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

CRR1 CLASSIFICATION

Significant Natural Area Park Name

Meadowvale Conservation Area

PLANNING DISTRICT

Meadowvale Village

AREA (Ha) 82.79

CONSERVATION AUTHORITY

Credit Valley Conservation SUBWATERSHED

Credit River

OWNERSHIP

Public-Private

SURROUNDING LAND USE

Residential

GENERAL SUMMARY CRR1 is located north along the Credit River from Derry Road West to the northern City limits. MV18 and MV19 are within 500 m to the southwest, and west respectively. MV12 is connected to this natural area via a Special Management Unit (SMA) comprised of a Stormwater Management Pond, which is between the two Significant Natural Areas. The Credit River provides connectivity to other natural areas including CRR3, CRR6, and CRR8. CRR1 is two parcels divided by Derry Road West but is connected via the watercourse and the well-developed public trail system. CRR1 is surrounded by residential and parkland areas and supports a variety of wildlife species. PHYSICAL DESCRIPTION CRR1 is a medium-sized natural area for the City. The topography of this site varies from undulating floodplain and tableland to steep valley walls. Along the western bank, the valley wall is approximately 6 m high, with slopes between 15 and 25 percent. The soil at this site is imperfectly drained Chinguacousy clay loam, which has developed within the Halton till plain. Some siltation of the river is occurring due to bank erosion. There are no known Earth Science Features within this area. Hydrological Features within this area include a watercourse and the Provincially Significant Churchville-Norval Wetland complex. CRR1 site is designated as an Environmentally Significant Area. CONDITION This site is currently in a fair-poor condition. Disturbances include an extensive formal and

unplanned trail system, garbage, erosion, siltation, and vehicle and airplane noise. Highly invasive plant species (as regarded by Ontario Invasive Plant Council) include European Buckthorn (Rhamnus cathartica), Purple Loosestrife (Lythrum salicaria), Common Reed (Phragmites australis), Reed Meadowgrass (Glyceria maxima), Tartarian Honeysuckle (Lonicera tatarica), Himalayan Balsam (Impatiens glandulifera), Norway Maple (Acer platanoides) and Garlic Mustard (Alliaria petiolata). The affects of the Emerald Ash Borer infestation are apparent at this site. ECOLOGICAL LAND CLASSIFICATION Number of Plant Communities There are 11 plant communities within CRR3, including Deciduous Forest (FOD), Open Water (OAO), Deciduous Swamp (SWD), Meadow Marsh (MAM), Cultural Plantation (CUP) and Cultural Meadow (CUM). Community descriptions are appended. Significant Plant Communities There are no Significant Plant Communities in CRR1. SPECIES RICHNESS Flora 346 species have been recorded from the site, a medium diversity for the City. The native FQI is 56.49, and the native mean coefficient is 3.81, which are high and medium values, respectively. In total, 126 introduced plant species are present (representing 36.42% of the total number of species present). 3 flora species considered provincially significant or at risk within the province and/or nationally have been recorded at this site.

Page 3: Natural Areas Survey (NAS) Site: CRR1 · SAS1/MAS2-1 MAM2-2 CUM/CUT FOD4-2/CUW CUM1-1 A R E A S S Y S T E M. City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

74 Credit Valley Conservation flora species of Conservation Concern (Tier 1-3) have been recorded on site. Fauna There are 87 bird, 11 mammal, 6 amphibian, 6 reptile and 7 insect species documented at this site. 7 fauna species (two are historical records) considered significant or at risk within the province and/or nationally have been recorded at this site. 73 Credit Valley Conservation fauna species of Conservation Concern (Tier 1-3) have been documented at this site. MANAGEMENT RECOMMENDATIONS 1. Invasive species are prevalent; an invasive

species management plan should be prepared to address the removal of invasive species.

2. Many ad hoc trails are present within CRR1 and should be closed to prevent further degradation of the natural area.

3. Restoration plantings should be maintained to ensure success.

4. Mowing within natural areas should be limited.

REFERENCES City of Mississauga (1978)

Dougan and Associates (1995c)

Dougan and Associates (1995e)

North-South (2001)

Project Planning Limited (1993)

Stantec Consulting Ltd. (2004)

Totten Sims Hubicki and ESG International (2002)

Page 4: Natural Areas Survey (NAS) Site: CRR1 · SAS1/MAS2-1 MAM2-2 CUM/CUT FOD4-2/CUW CUM1-1 A R E A S S Y S T E M. City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

ECOLOGICAL LAND CLASSIFICATION Fresh-Moist Willow Lowland Deciduous Forest Type (FOD7-3)

The willow lowland forest is dominated by willow (Salix alba, S. fragilis, S. x rubens), Green Ash (F. pennsylvanica), American Elm (Ulmus americana), Balsam Poplar (Populus balsamifera), Eastern Cottonwood (P. deltoides ssp. monilifera), Red Maple (Acer rubrum) and Black Maple (A. nigrum). The canopy is between 10-25 m in height and covers > 60%. The sub-canopy is dominated by willow, Manitoba Maple, Green Ash and American Elm. This layer is between 2-10 in height and covers 25-60%. The understory consists of European Buckthorn, Manitoba Maple, Tartarian Honeysuckle, Red-osier Dogwood (Cornus stolonifera), and Riverbank Grape (Vitis riparia). This layer is 1-2 m in height and covers > 60%. The ground layer is dominated by Spotted Jewelweed (Impatiens capensis), Pale Jewelweed (I. pallida), Bittersweet Nightshade (Solanum dulcamara) and Spotted Water-hemlock (Cicuta maculata). Himalayan Balsam (Impatiens glandulifera) is dominant in some locations. The ground layer is 0.5-1 m in height and covers > 60%. Standing water is present through the spring, drying by mid-summer.

Dry-Fresh White Ash Deciduous Forest Type (FOD4-2)

The white ash forest is in an early stage of succession after canopy loss from Emerald Ash Borer. In some parts it is more like a Cultural Woodland. The canopy is dominated by White Ash, American Elm, Bur Oak and Sugar Maple. The canopy is approximately 15 m in height and covers > 60%. The sub-canopy consists of White Ash, Sugar Maple, American Elm and Bur Oak and is 2-10 m in height and covers 10-25%. The understory is dominated by European Buckthorn, Tartarian Honeysuckle, Grey Dogwood (Cornus foemina ssp. racemosa), hawthorn (Crataegus spp.) and lilac (Syringa vulgaris). This layer is 1-2 m in height and covers 25-60%. Garlic

Mustard dominates the ground layer, Dame’s Rocket (Hesperis matronalis), avens (Geum spp.) and Motherwort (Leonurus cardiaca). This layer is between 0.2-0.5 m in height and covers 25-60%

Fresh-Moist Poplar Deciduous Forest Type (FOD8-1)

The poplar forest is in an early stage of succession. The canopy is dominated by Trembling Aspen (P. tremuloides), Balsam Poplar, Manitoba Maple, Green Ash and Black Walnut (Juglans nigra). The canopy is between 10-25 m in height and covers approximately 70%. The sub-canopy consists of Trembling Aspen, Manitoba Maple, Balsam Poplar and Green Ash. This layer is between 2-10 m and covers 1-10%. The understory is dominated by European Buckthorn, Tartarian Honeysuckle, Riverbank Grape and Virginia Creeper (Parthenocissus inserta). This layer is between 1-2 m in height and covers 10-25%. The ground layer is dominated by White Avens (G. canadense), Bittersweet Nightshade, Garlic Mustard and Canada Bluegrass (Poa compressa). This layer is 0.5-1 m and covers 25-60%.

Willow Mineral Deciduous Swamp Type (SWD4-1)

The willow swamp is dominated by White Willow (Salix alba), Hybrid Crack Willow (S. x rubens), Balsam Poplar, Eastern Cottonwood (P. deltoides) and Trembling Aspen. The canopy layer is > 25 m in height and covers > 60%. The sub-canopy is dominated by willow (Salix spp.), Manitoba Maple, Balsam Poplar, and Trembling Aspen. This layer is between 10-25 m in height and covers 10-25%. The understory consists of Manitoba Maple, Virginia Creeper, Riverbank Grape, Tartarian Honeysuckle and European Buckthorn. This layer is between 2-10 m in height and covers 10-25%. The ground layer consists of Spotted Jewelweed, Pale Jewelweed, Spotted Joe-pye Weed

Page 5: Natural Areas Survey (NAS) Site: CRR1 · SAS1/MAS2-1 MAM2-2 CUM/CUT FOD4-2/CUW CUM1-1 A R E A S S Y S T E M. City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

City of Mississauga Natural Areas Study (2019) Natural Areas Fact Sheet

(Eupatorium maculatum ssp. maculatum), Great Ragweed (Ambrosia trifida), and sedges (Carex spp.). Some areas are dominated by Policemen’s Helmet, Cow Parsnip (Heracleum maximum) and Wild Parsnip (Pastinaca sativa). The ground layer is between 0.5-1 m in height and covers 25-60%.

Forb Mineral Meadow Marsh Type (MAM2-10)

The forb mineral meadow marsh is dominated by Reed Canary Grass (Phalaris arundinacea), Giant Manna Grass (Glyceria maxima), Jerusalem Artichoke (Helianthus tuberosus), Elecampagne (Inula helenium), Cow Parsnip, Wild Parsnip, Purple Loosestrife (Lythrum salicaria), jewelweed (I. capensis, pallida and glanulifera), and Spotted Joe-pye Weed. Several clumps of the sedge, Carex lacustris, are present. This vegetation community is between 1-2 in height and covers >60%.

Pondweed Mixed Shallow Aquatic Type (SAM1-4)

The pondweed mixed shallow aquatic community is comprised of Lesser Duckweed (Lemna minor), Water Smartweed (Polygonum amphibium) and Common Water-plantain (Alisma plantago-aquatica). This community is located in shallow water and vegetation covers between 25-60%.

Coniferous Plantation (CUP3)

The canopy of the cultural plantation consists of White Pine (Pinus strobus), Manitoba Maple, Siberian Elm (Ulmus pumila), and Sugar Maple (A. saccharum ssp. saccharum). This layer is between 10-25 m in height and covers > 60%. The sub-canopy is dominated by Manitoba Maple, Siberian Elm, Sugar Maple and Green Ash. This layer is between 2-10 m in height and covers 1-10%. The understory consists of Manitoba Maple, European Buckthorn, Riverbank Grape (Vitis riparia) and Tartarian Honeysuckle. This layer is between 1-2 m and covers 10-25%.

The ground layer is dominated by Garlic Mustard, with Yellow Avens, Bittersweet Nightshade (Solanum dulcamara) and Virginia Creeper. This layer is 0.5-1 m in height and covers 25-60%.

Dry-Moist Old Field Meadow Type (CUM1-1)

The cultural meadow is dominated by Bittersweet Nightshade, Teasel (Dipsacus fullonum ssp. fullonum), Tufted Vetch (Vicia cracca) and Orchard Grass (Dactylis glomerata). Scattered Red-osier Dogwood (Cornus stolonifera) and hawthorn (Crataegus spp.) occur throughout this community. Vegetation is between 1-2 m and covers > 60%.

Open Aquatic (OAO)

The open aquatic community refers to the Credit River; this community contains no vegetation. The manicured community is located along the east bank of the Credit River, northwest of Meadowvale Village. There are picnic areas, gravel trails, parking and playgrounds present in this area.

The abutting Special Management Area includes Cattail Mineral Shallow Marsh (MAS2-1) and Submerged Shallow Aquatic (SAS1). These communities are a pond with cattails (Typha latifolia and T. angustifolia). Surrounding submerged pondweeds (Potamogeton spp.) and floating duckweed (Lemna sp.)