Aquatic Invasive Species: A Minnesota Handbook
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1 Aquatic Invasive Species: A Minnesota Handbook
2 When is the best time to search for these invasive species? most visible less visible least visible Common Name Scientific Name Jan Feb Mar Apr May June July Aug Sep Oct Nov Dec AIS INVERTEBRAT ES Zebra Mussel Dreissena polymorpha un der ice; die where froze en or i ce scoured larg er, prior-year(s) shells visible on hard surface ** small, current-yea r shellss visible on hard su rface ** u nder ice Quagga Mussel Dreissena rostriformis bugensis un der ice; die where froze en or i ce scoured larg er, prior-year(s) shells visible on hard surface ** small, current-yea r shellss visible on hard su rface ** u nder ice Faucet Snail Bithynia tentaculata un der ice; die where froze en or i ce scoured snails fro m current and prior ye ear(s) on lake bottom or other surface u nd er ice Spiny Waterflea Bythotrephes longimanus eggs lie dormant on lake bottom daytime: in dee p or da rk water nighttime: near surface adults d ie eggs dormant Fishhook Waterflea Cercopagis pengoi eggs lie dormant on lake bottom daytime: in dee p or da rk water nighttime: near surface adults d ie eggs dormant AIS PL ANTS Eurasian Watermilfoil Myriophyllum spicatum plant un der ice plant growth may for m floating ma at a t surface plants die b ack small plants unde er ice Curly-leaf Pondweed Potamogeton crispus small growth of plants under ice plant growth may form floating mat at surf face pl ants die ba ck new plants spro rout Hydrilla Hydrilla verticillata plant un der ice plant growth plant forms floating mats at surface plants die back plant u nder ice Brazilian Waterweed Egeria densa plant un der ice plant growth plant forms floating mats at surface plants die back plant u nder ice Purple Loosestrife Lythrum salicaria plant dorman t plant growth f lowering plants die back pl ant d ormant Flowerin g Rush Butomus umbellatus p lant dorman t p lan t growt h ** Important search times for early detection o f zebra and quagga mussels** * Al l flowering dates are approximate. plants die b ack pla nt d ormant
3 Table of Contents What to look for Small clams Invasive Native Common Name Quagga Mussel Zebra Mussel Fingernail Clams Limpet Snails Scientific Name Dreissena rostriformis bugensis Dreissena polymorpha Musculium spp., Sphaerium spp. Pisidium spp. Ferrissia spp. Tiny snails Faucet Snail Fossaria Snails Bithynia tentaculata Lymnaea spp. and Fossaria spp. Gelatinous mass on fishing line Underwater plants with delicate, feathery leaves Underwater plants with lasagna leaves Underwater plants with small whorled leaves Magenta flower spike atop a 3-9 foot wetland plant Spiny Waterflea Bythotrephes longimanus Fishhook Waterflea Cercopagis pengoi Native Waterflea Leptodora kinditii Eurasian Watermilfoil Myriophyllum spicatum Northern Watermilfoil Myriophyllum sibiricum Coontail Ceratophyllum demersum White Water Crowfoot Ranunculus aquatilis Water-Marigold Bidens (Megalodonta) beckii Common Bladderwort Utricularia vulgaris Curly-leaf Pondweed Potamogeton crispus Robbins Pondweed Potamogeton robbinsii Other Native Pondweeds Potamogeton spp. Water-celery (Eelgrass) Vallisneria americana Hydrilla Hydrilla Vertcillata Brazilian Waterweed Egeria densa Common Waterweed (Elodea) Elodea canadensis Slender Waterweed Elodea nuttallii Purple Loosestrife Lythrum salicaria Fireweed Epilobium angustifolium Blazing Stars Liatris spp. Hedgenettles (Woundworts) Stachys spp. Large, pink flower cluster atop a 3-7 foot wetland plant Flowering Rush Joe Pye Weeds Swamp Milkweed Butomus umbellatus Eutrochium spp. Asclepias incarnata
4 Zebra Mussel Dreissena polymorpha and Quagga Mussel Dreissena rostriformia bugensis Zebra mussel actual size Quagga mussel actual size Photo courtesy of USDA NRCS Photo courtesy of USDA NRCS Quagga mussels (left) Zebra mussels (right) Small clams current-year mussels older adults Adapted from California Dept of Fish and Game Attachment threads are unique to Quagga and Zebra mussels in Minnesota lakes Zebra mussels attached to a native clam ttachment threads hinge area long and flat D. P. Molloy
5 Fingernail Clams Musculium spp., Sphaerium spp. and Pisidium spp. Lake fingernail clam Striated fingernail clam Musculium lacustre Sphaerium striatinum and dime, actual size. and dime, actual size. Andrew Hicks et al. x 5 Pea clam Pisidium sp. and dime, actual size. hinge area short and rounded with no attachment threads x Peter Walker x Andrew Hicks et al. Small clams Limpet Snails Ferrissia spp. Ferrissia rivularis single shell with no hinge Ferrissia fragilis x x Limpets on plant
6 Faucet Snail Bithynai Bithynia tentaculata Tiny snails MN DNR Roger Haro, River Studies Center, UW-La Crosse x15 Amy Benson USGS MN Sea Grant Since it is difficult to distinguish the native snails from the non-native, invasive Faucet snail, please report every occurrence of tiny snails.
7 Fossaria Snails Lymnaea spp. and Fossaria spp. Lymnaea spp. and Fossaria spp. Pygmy fossaria Lymnaea parva and dime, size. X Andrew Hicks et al. Tiny snails Prairie fossaria Fossaria bulimoides and dime, actual size. X Andrew Hicks et al. Since it is difficult to distinguish the native snails from the non-native, invasive Faucet snail, please report every occurrence of tiny snails.
8 Spiny Waterflea Bythotrephes longimanus and Fishhook Waterflea Cercopagis pengoi Spiny Waterflea gelatinous mass on fishing line Gelatinous mass on fishling line Spiny Waterflea actual size Fishhook Waterflea single, dark eye spot Spiny Waterflea long tail Up to 5/8 inch (15 mm) mychamplain.net Since it is difficult to distinguish the native Leptodora from these non-native, invasive waterfleas, please report all occurrences of gelatinous masses found on fishing lines, anchor ropes, and/or downrigger cables.
9 Adapted from cfb.unh.edu Native Leptodora Waterflea Leptodora kinditii short, Side view Top view Up to 1/4 inch (6mm) Adapted from: Zooplankton Project zooplankton/default.htm single, dark eye spot Gelatinous mass on fishling line Since it is difficult to distinguish the native Leptodora from the non-native, in-vasive waterfleas, please report all occurrences of gelatinous masses found on fishing lines, anchor ropes, and/or downrigger cables.
10 Myriophyllum spicatum lea fle ts central axis leaflet 16 Underwater plants with delicate, feathery leaves Eurasian Watermilfoil leaf (Hint: count leaflets on one side of central axis - number of leaflets range from 12-21) leaf
11 Northern Watermilfoil Myriophyllum sibiricum leaf leaflet central axis usually 12 or fewer pairs of leaflets (Hint: count leaflets on one side of central axis) leaf Underwater plants with delicate, feathery leaves
12 Coontail Ceratophyllum demersum Underwater plants with delicate, feathery leaves leaves forked (no central axis) leaf leaf
13 White Water Crowfoot Ranunculus aquatilis leaf leaf continuously branching (no central axis) Underwater plants with delicate, feathery leaves
14 Water-Marigold Bidens (Megalodonta) beckii Underwater plants with delicate, feathery leaves leaf leaf continuously branching (no central axis)
15 Common Bladderwort Utricularia vulgaris leaf continuously branching (no central axis) small sacs or bladders attached to leaves capture tiny critters (= carnivore) Underwater plants with delicate, feathery leaves
16 Curly-leaf Pondweed Potamogeton crispus Underwater plants with lasagna leaves prominent branching veins Curly-leaf Pondweed single leaf 2x leaf edges have fine teeth
17 Robbins Pondweed Potamogeton robbinsii Fern Pondweed single leaf Underwater plants with lasagna leaves leaves have prominent parallel veins (hold up to light) leaf edges have fine teeth (use magnifying glass)
18 Other Native Pondweeds Potamogeton spp. Clasping-leaf Pondweed Potamogeton richardsonii Variable-leaf Pondweed Potamogeton gramineus Underwater plants with lasagna leaves Flat-stem Pondweed Potamogeton zosteriformis leaf edges have no teeth Alpine Pondweed Potamogeton alpinus Plants shown in reduced size - for illustration purposes only.
19 Water-celery (Eelgrass) Vallisneria americana leaf edges have no teeth Underwater plants with lasagna leaves
20 Underwater plants with small whorled leaves on long stems Hydrilla Hydrilla verticillata Non-native invasive plant that closely resembles Elodea. Bright green leaves (usually 4-5) in each whorl. Leaves have visible teeth and small spines on the underside. For more information on this plant go to: spine teeth
21 leaf edges have very small serrations Brazilian Waterweed Egeria densa 2x Life-size. Very leafy appearance. Leaves in whorls of 4 to 6. Underwater plants with small whorled leaves on long stems
22 Underwater plants with small whorled leaves on long stems Common Waterweed (Elodea) (Elodea canadensis) Small, lance-shaped leaves attach directly to stem in whorls of 3. Leaves crowded toward tip of stem. Occasionally leaves will grow in whorls of 2. No teeth or spines on leaf margins.
23 Leaves evenly spread out along tip of stem. Slender Waterweed Elodea nuttallii More delicate in structure with narrower stems and finer leaves than Elodea. Leaves pointed and arranged in whorls of 3 or 4. No teeth or spines on leaf margins. Underwater plants with small whorled leaves on long stems
24 Purple Loosestrife Lythrum salicaria Magenta flower spike atop a 3-9 foot wetland plant stems are angular (usually square) leaf edges are smooth (have no teeth)
25 Blazing Stars Liatris spp. round stem Magenta flower spike atop a 3-9 foot wetland plant
26 Fireweed Epilobium angustifolium Magenta flower spike atop a 3-9 foot wetland plant round stem
27 Hedgenettles (Woundworts) Stachys spp. angular (square) stem leaf edges have teeth Magenta flower spike atop a 3-9 foot wetland plant
28 Large, pink flower cluster atop a 3-7 foot wetland plant Flowering Rush Butomus umbellatus flower stalk has no leaves
29 flower stalk has leaves Joe Pye Weeds Eutrochium spp. Large, pink flower cluster atop a 3-7 foot wetland plant
30 Large, pink flower cluster atop 3-7 foot wetland plant flower stalk has leaves Swamp Milkweed Asclepias incarnata
31 For more information about Minnesota aquatic invasive species go to: MN Department of Natural Resources - MN Sea Grant MN AIS Research Center - Funding for this booklet provided by Becker, Beltrami, Cass, Clearwater, Douglas and Polk Counties of Minnesota. Information included from U of MN Extension, MN DNR and MN Sea Grant resources. To purchase additional copies or customized booklets for your area, contact: vjhaack@gmail.com
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