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Illin o is aquatic sowbug Asellus sp. Photograph © Paul P. Tinerella northern clearwater crayfish A Aquatic Macroinvertebrates B A. adult Hexagenia sp.; B. nymph Isonychia sp. mayfly Photographs © Michael R. Jeffords Orconectes propinquus Photograph © Michael R. Jeffords ruby spot damselfly Hetaerina americana Photograph © Michael R. Jeffords aquatic snail Pleurocera acutum Photograph © Jochen Gerber, The Field Museum of Natural History predaceous diving beetle Dytiscus circumcinctus Photograph © Paul P. Tinerella monkeyface mussel Quadrula metanevra common skimmer dragonfly - nymph Photograph © Kevin S. Cummings Libellula sp. Photograph © Paul P. Tinerella water scavenger beetle Hydrochara sp. Photograph © Steve J. Taylor devil crayfish B A Cambarus diogenes Photograph © Christopher Taylor dobsonfly Corydalus sp. A. larva; B. adult Photographs © Michael R. Jeffords common darner dragonfly - nymph Aeshna sp. Photograph © Paul P. Tinerella giant water bug Belostoma lutarium Photograph © Paul P. Tinerella aquatic worm Slavina appendiculata Photograph © Mark J. Wetzel water boatman Trichocorixa calva Photograph © Paul P. Tinerella aquatic mite Order Prostigmata Photograph © Michael R. Jeffords backswimmer Notonecta irrorata Photograph © Paul P. Tinerella leech - adult and young Class Hirudinea pygmy backswimmer Photograph © William N. Roston undreds of species of aquatic macroinvertebrates live in Illinois in a H Neoplea striola mosquito - larva Toxorhynchites sp. Photograph © Paul P. Tinerella Species List sensitive to changes in their environment and are relatively easy to collect Species are not shown in proportion to actual size. Phylum Annelida Class Clitellata in aquatic sampling activities. The 22 species shown on this poster were selected by Dr. Paul Tinerella of the Illinois Natural History Survey to Family Naididae Class Hirudinea Phylum Mollusca Phylum Arthropoda aquatic worm Slavina appendiculata Family Pleuroceridae aquatic snail Pleurocera acutum Class Bivalvia Family Unionidae monkeyface mussel Quadrula metanevra Order Prostigmata Order Araneae Superfamily Hygrobatoidea Family Pisauridae aquatic mite fishing spider Dolomedes sp. Class Malacostraca Order Isopoda Order Decapoda Family Asellidae Family Cambaridae aquatic sowbug devil crayfish northern clearwater crayfish Asellus sp. Cambarus diogenes Orconectes propinquus Class Hexapoda Order Ephemeroptera Family Ephemeridae Family Isonychiidae Family Aeshnidae Family Libellulidae Family Calopterygidae Family Corixidae Family Notonectidae Family Pleidae Family Belostomatidae Family Corydalidae Family Dytiscidae Family Hydrophilidae Family Culicidae mayfly mayfly common darner common skimmer ruby spot damselfly water boatman backswimmer pygmy backswimmer giant water bug dobsonfly predaceous diving beetle water scavenger beetle mosquito Hexagenia sp. Isonychia sp. Aeshna sp. Libellula sp. Hetaerina americana Trichocorixa calva Notonecta irrorata Neoplea striola Belostoma lutarium Corydalus sp. Dytiscus circumcinctus Hydrochara sp. Toxorhynchites sp. Class Arachnida This poster was made possible by: leech Class Gastropoda and identify, aquatic macroinvertebrates are often used in biological monitoring of streams. They also are encountered when students participate Photograph © Paul P. Tinerella Kingdom Animalia others contain still water. In order to survive in water, these organisms They meet the challenge by using numerous adaptations. Because they are Dolomedes sp. Photograph © Michael R. Jeffords variety of habitats. Some of the habitats have flowing water while must be able to breathe, find food, protect themselves, move and reproduce. fishing spider Order Odonata Order Hemiptera represent typical aquatic macroinvertebrate species of Illinois. Order Megaloptera Order Coleoptera Glossary words are defined on the back of the poster. Order Diptera Illinois Department of Natural Resources Division of Education Illinois Wildlife Preservation Fund Funding for this poster was made possible in part by contributions to the Illinois Wildlife Preservation Fund. Text: Paul P. Tinerella, Illinois Natural History Survey Illino i s Aquatic Macroinvertebrates Living in Water Glossary here are hundreds of aquatic macroinvertebrate species in Illinois. Generally, they can be grouped into the following categories: sponges; hydrazoans; flatworms; aquatic nematodes; horsehair worms; aquatic earthworms; leeches; bryozoans; snails; mussels and clams; and arthropods. These organisms exhibit a variety of adaptations to help them survive in water. Although too numerous to list all of them here, some examples of these adaptations are described below. Locomotion – For moving in the water column, swimming is often accomplished with the aid of paddlelike appendages. The bottom-dwelling macroinvertebrates may crawl or burrow. Some burrowing species have legs shaped like shovels. Claws are present on some bottom-dwellers where the current is strong. They must cling tightly to objects on the bottom to keep from being swept away. Suckers are used by leeches to hold on to the substrate and to move. Other macroinvertebrates use the surface tension of the water as a base for them to glide or walk upon. Breathing – All aquatic invertebrates must have oxygen for respiration and remove carbon dioxide from their body. Many of them come to the water’s surface to obtain air. They can trap it by using body parts (wings, legs, hairs) or gulp it through breathing tubes. Water contains dissolved oxygen. Some aquatic macroinvertebrates take advantage of dissolved oxygen with their internal or external gills, by absorption directly through the skin or by using a bubble of air that was trapped at the surface and attached to their body. The bubble can extract oxygen from the water. Life Cycle – Some aquatic macroinvertebrates (aquatic worms, mollusks, most crustaceans) spend their entire life in water. Others use water for a portion of their life cycle (many insects) or as a base from which they can go to other moist habitats (crayfish). T Feeding – Some species are able to filter small organisms and other food particles from the water. Other species hunt prey, eat plants or scavenge. Protection – A physical barrier, like a protective shell or a case built of stones, sand or plant material, can be used to help escape predation. Behavioral adaptations (fleeing, burrowing or hiding) also are effective. Coloration that blends with the surroundings affords protection as well. Reproduction – Crayfish lay their eggs in water, and the eggs and young develop there. Adults may move to other moist habitats. Most water fleas (crustaceans) reproduce parthenogenically, eggs develop without being fertilized by a male, hatch internally and are born live. Males are occasionally produced, and they mate with females to form cysts that can live in a dormant state for years. Most snails are hermaphrodites, with both male and female reproductive systems. Although they do not fertilize their own eggs, in these species any two snails can mate. Insects use a variety of reproductive strategies. Dispersal – Many aquatic insect adults can fly. Moving to a new area is simple for them. Crayfish are capable of leaving water to travel across land. The adult stage of some insects may be terrestrial. Flooding can help to disperse species. Ducks, geese and other waterfowl and wading birds may inadvertently take along eggs of aquatic macroinvertebrates on their feet as they move to a different location. The stream current is an effective means of transportation. carnivorous detritivore detritus macroinvertebrate mandible membranous omnivore periphyton phytoplankton plankton plastron predaceous prehensile rostrum semiaquatic Species Descriptions silty spring aquatic mite Order Prostigmata Water mites are common year-round in aquatic habitats throughout Illinois. Ranging from transparent to blue, green, red and other colors, these animals are often conspicuous in a variety of habitats. Water mites seen swimming freely are adults. Immature individuals seek out various insect hosts, including beetles, true bugs, stoneflies, true flies and dragonflies. Immature water mites attach themselves to membranous portions of the aquatic insect and remain attached until maturation. Upon transformation, the mite becomes free-living. The free-living stage is typically carnivorous, feeding on aquatic insects, small crustaceans and aquatic worms. A few species are omnivores, feeding on vegetation and detritus as well. aquatic snail Pleurocera acutum Snails are univalves, having a single shell with a spiral, coil or cone. Aquatic snails range from about one-eighth inch to about three inches in length. The head has a pair of tentacles. Aquatic snails crawl on the bottom of nearly all freshwater aquatic habitats but prefer the shallow areas with little water movement and many plants. Snails require calcium carbonate to produce their shell, so aquatic snails are more common in water with abundant supplies of calcium carbonate. Some of these creatures are detritivores or omnivores while others feed on algae. Snails are an important food source for many other aquatic species. aquatic sowbug Asellus sp. Aquatic sowbugs are found in a variety of aquatic habitats in Illinois, often living among leaf litter and detritus. They are particularly abundant in springs. A few species are predaceous but most are omnivore-detritivores, feeding on a variety of food sources. leech Class Hirudinea Leeches are segmented worms. Their body is flattened and has 34 segments. They may be brightly colored or have a distinctive pattern, although usually their background color is some shade of brown, gray or black. The underside of the body has a sucker at each end, with the mouth contained in the anterior sucker. Suckers are used for feeding, movement and attachment. Some leeches live freely, feeding on organic materials on the bottom of the water body or preying upon invertebrates, including leeches. Other leeches are external parasites on vertebrates, such as fishes and amphibians. Leeches are usually found in quiet water that is less than six feet deep and that has an abundance of protective cover (plants, plant parts, rocks). They range in size from about one-fourth inch to several inches long. mayflies Hexagenia sp. and Isonychia sp. Mayflies are common and frequently abundant in Illinois. They have a very short life span (often two weeks or less). Nymphs of Illinois mayflies are aquatic, while adults spend their short life out of the water. Mayflies occur in a variety of aquatic habitats and specialized niches. Some mayflies are excellent swimmers, some are effective burrowers and others sprawl on rocks within streams and rivers. Immature mayflies are extremely sensitive to changes in environmental conditions and are excellent indicators of stream and river habitat “health.” monkeyface mussel Quadrula metanevra This species, a segmented worm, is widely distributed throughout Illinois. It is free-living and found in detritus mats, in silty substrates and other debris in lakes, ponds, streams and rivers. It is a detritivore, feeding on periphyton and phytoplankton. The monkeyface mussel lives in medium or large rivers with a gravel or sand-and-gravel bottom. The common name of this species results from an indentation on the posterior edge of the shell that has the appearance of a chimpanzee. Growing to four inches in length, the shell is rounded or square with large bumps on the posterior section. There may be zigzag marks on the shell. Mussels have a complicated life cycle that involves a host for its parasitic intermediate larval stage, the glochidium. Food for mussels consists of detritus and plankton that they filter from the water. backswimmer mosquito aquatic worm Slavina appendiculata Notonecta irrorata The backswimmer is a common sight in Illinois ponds, lakes and sometimes in swimming pools and other nonnative habitats. It is a predator and supreme swimmer. Its formidable “beak,” or rostrum, that appears as a large needle, is a piercing-sucking device for capturing prey and feeding. Backswimmers make a migratory flight in autumn to suitable habitats for reproducing and overwintering. They are active year round under water, even under ice in winter. devil crayfish Cambarus diogenes The devil crayfish can be found statewide in Illinois. It is one of four species in the state that spends a majority of its time in underground burrows that it builds. Burrows are often located along creek and lake margins and usually have a mud chimney. Devil crayfish consume insects and plant matter as the main components of their diet. dobsonfly Dobsonfly adults are attracted to lights and may be seen flying around street lights on summer evenings. Males and females can be easily distinguished, as females have short, functional mouthparts, while males have very long (several times longer than the head) mandibles that are used for courtship, defense and aggressive behavior. Dobsonfly males are a formidable sight when encountered. Larvae, called hellgrammites, are used by humans as fishing bait. Larvae have well-developed gills for underwater respiration. Larvae can attain a length of about three and a half inches, while adults can be more than six inches long, including the wing length. Since the larvae require well-oxygenated water conditions, when present, they are indicative of good stream or river quality. Aeshna sp., Libellula sp. and Hetaerina americana Dragonfly and damselfly adults are familiar sights in Illinois, especially in the spring and autumn. Adults are entirely terrestrial and are active predators on mosquitoes and other insects. Immature dragonflies and damselflies are less conspicuous but inhabit all aquatic habitats in Illinois. Just like the adults, nymphs are voracious and opportunistic predators, often feeding on organisms much larger than themselves. The mouthparts of dragonfly and damselfly nymphs are modified into an extensible prehensile structure. It is retracted under the head at rest, and when feeding, the animal rapidly shoots out the mouthparts to capture prey. Dragonfly nymphs are excellent swimmers and can use “jet propulsion” under water by forcefully expelling water from their abdomen to move from place to place. fishing spider Dolomedes sp. Several species of spiders occur on the shoreline of lakes and ponds and on the banks of rivers and streams. All are predaceous, feeding generally on aquatic and semiaquatic organisms. Fishing spiders do not spin webs but actively hunt their prey on the water’s surface. They dive below the water to prey on submerged organisms or to escape predation. They can remain submerged for several minutes and use a large air bubble attached to their body (plastron) to breathe. These spiders are common throughout Illinois. giant water bug Mosquito larvae are aquatic and occur anywhere there is standing water: lakes; ponds; swamps; marshes; bogs; tree holes; pitcher plant leaves; old tires; buckets; ditches; and any other depression that will hold water for a short time. Larval mosquitoes remain near the water’s surface to utilize atmospheric air by means of a respiratory siphon. Some mosquitoes can remain submerged by tapping their air siphon into plant tissue or roots for oxygen. Most larvae are detritivores, however some are omnivorous and predatory, feeding on smaller aquatic organisms. Larval mosquitoes are called “wrigglers” because of their thrashing and diving motions when disturbed. Mosquito pupae generally remain near the surface of the water, where they molt to the adult mosquito, finishing the complete metamorphosis cycle. Female mosquitoes eat blood, while males feed on plant sap. northern clearwater crayfish Corydalus sp. dragonflies and damselflies Toxorhynchites sp. Belostoma lutarium Giant water bugs are large. They are known as “electric light bugs” because they were once commonly seen around street lamps and other lights, especially in the spring and autumn. Giant water bugs are strong flyers and occur in many aquatic habitats across Illinois. Nymphs and adults are predators, feeding on aquatic insects and other macroinvertebrates their own size, small fishes, tadpoles, frogs, salamanders and even other giant water bugs. Dytiscus circumcinctus Predaceous diving beetles range in size from about the width of a ball-point pen tip to nearly two and a half inches. Larvae and adults are predators. The larvae are called “water tigers” because of their active hunting habits. Larvae and adults are known to prey on small fishes, tadpoles, frogs and other aquatic beetles. Adults and most larvae must rise to the surface periodically to renew air stores for breathing. This family of beetles is found statewide in Illinois. They are often the first beetles to colonize a temporary or new aquatic habitat. pygmy backswimmer Neoplea striola Pygmy backswimmers are common although often overlooked due to their small size. They are widely distributed and often occur in very large populations, sometimes associated with a hatch of their potential prey items, including mosquito larvae and other aquatic macroinvertebrates. Pygmy backswimmers swim upside down but are not great swimmers. They move freely throughout the water column, sometimes attaching to aquatic vegetation. water boatman Trichocorixa calva Water boatmen are most abundant during the spring and autumn. Both nymphs and adults spend their entire life in water except when adults disperse to new habitats. Water boatmen are omnivorous, with most Illinois species feeding on plant and detritus material while a few species are predaceous. Unlike all other true bugs, water boatmen lack a true beak (rostrum), or piercing-sucking mouthparts. Found throughout Illinois, water boatmen are an important food source for wading birds, shorebirds, ducks, geese and other animals associated with Illinois aquatic habitats. water scavenger beetle transformation organism that eats detritus organic matter on the bottom of a body of water animal that can be seen without magnification and that has no internal skeleton one of a pair of insect mouthparts located directly behind the upper lip made of a thin tissue organism that obtains and eats both plant and animal materials plants that grow on or from the bottom of a water body tiny organisms that float in the water column and are capable of making their own food microscopic organisms suspended in the water thin film of air held to an insect’s body by hairs or scales feeding on organisms (prey) that the animal (predator) has hunted and killed adapted for grasping in insects, a beaklike process living in an environment that is associated with an aquatic environment or living in a wet environment covered with dirt, fine sand or other very tiny particles that have been carried and deposited by water a place where groundwater exits onto the earth’s surface living on land change in form, such as from an immature to the adult References Cummings, K. S., and C. A. Mayer. 1992. Field guide to freshwater mussels of the Midwest. Illinois Natural History Survey Manual 5. 194 pp. Huggins, D. G., P. M. Liechti, and L. C. Ferrington, Jr. 1985. Guide to the freshwater invertebrates of the Midwest. Technical Publication 11. Technical Publications of the Kansas Biological Survey, The University of Kansas, Lawrence, Kansas. 221 pp. Illinois Department of Natural Resources. 2003. Aquatic Illinois CD-ROM. Illinois Department of Natural Resources, Springfield, Illinois. Illinois Department of Natural Resources. 2008. Stream monitoring. http://www.dnr.state.il.us/education/EcoWatchFiles/mainpage.htm. Illinois Department of Natural Resources, Springfield, Illinois. Jeffords, M. R. 1997. Aquatic invertebrates in still and flowing waters poster and activity. Illinois Natural History Survey, Champaign, Illinois. McCafferty, W. P. 1981. Aquatic entomology. The fishermen’s and ecologists’ illustrated guide to insects and their relatives. Jones and Bartlett Publishers, Boston, Massachusetts. 448 pp. Merritt, R. W., K. W. Cummins, and M. B. Berg. 2008. An introduction to the aquatic insects of North America. Kendall Hunt Publishing, Dubuque, Iowa. 1158 pp. Smith, D. G. 2001. Pennak’s freshwater invertebrates of the United States. 4th edition. Wiley & Sons, New York, New York. 648 pp. Thorp, J. H., and A. P. Covich. 2001. Ecology and classification of North American freshwater invertebrates. Second edition. Academic Press, San Diego, California. 950 pp. Voshell, J. R., Jr. 2002. A guide to common freshwater invertebrates of North America. The McDonald and Woodward Publishing Company, Blacksburg, Virginia. 456 pp. Orconectes propinquus The northern clearwater crayfish is commonly found in rocky areas of creeks and lakes in the northern two-thirds of the state. It eats aquatic insects, algae, fishes and, in some cases, other crayfish. This species is being displaced in many regions of its range by the invasive rusty crayfish, Orconectes rusticus. predaceous diving beetle terrestrial feeding on the flesh of other organisms Hydrochara sp. Water scavenger beetles are found throughout Illinois aquatic habitats. They vary in size from extremely tiny to about two and a half inches in length. Some members of this family are more terrestrial than aquatic. Adults may be omnivores-detritivores or predatory. Larvae of aquatic species are typically predatory. Water scavengers breathe air and must surface to renew air supplies. These beetles are often found in association with predaceous diving beetles, usually in very large numbers. Agency Resources The Illinois Department of Natural Resources (IDNR) and other institutions in the state offer additional information about aquatic macroinvertebrates. The IDNR Division of Education has many Illinois-specific resources related to aquatics and aquatic macroinvertebrates for teachers. See the Web address listed below for more information. Publications about aquatic macroinvertebrates can be ordered through the Publications page at http://dnr.state.il.us/teachkids. The Illinois Natural History Survey in Champaign and the Illinois State Museum in Springfield have significant collections and conduct studies of aquatic macroinvertebrates. The Illinois Wildlife Preservation Fund, comprised of taxpayer donations, helps to support further understanding of these creatures by providing grants for projects, such as the development of this poster. Illinois Department of Natural Resources Division of Education One Natural Resources Way Springfield, IL 62702-1271 217-524-4126 http://dnr.state.il.us/education [email protected] Illinois Natural History Survey 1816 South Oak Street Champaign, IL 61820 217-333-6880 http://www.inhs.uiuc.edu/index.html [email protected] Illinois Department of Natural Resources Illinois State Museum 502 South Spring Street Springfield, IL 62706 217-782-7386 http://www.museum.state.il.us [email protected] Equal opportunity to participate in programs of the Illinois Department of Natural Resources (IDNR) and those funded by the U.S. Fish and Wildlife Service and other agencies is available to all individuals regardless of race, sex, national origin, disability, age, religion or other non-merit factors. If you believe you have been discriminated against, contact the funding source’s civil rights office and/or the Equal Employment Opportunity Officer, IDNR, One Natural Resources Way, Springfield, IL 62702-1271; 217/785-0067; TTY 217/782-9175. This information may be provided in an alternative format if required. Contact the DNR Clearinghouse at 217/782-7498 for assistance. Printed by the authority of the State of Illinois 10M - 6/09 Illinois Aquatic Macroinvertebrates © 2009, Illinois Department of Natural Resources IOCI 1198-09