Presentation on theme: "Benthic Macro-invertebrates"— Presentation transcript:
1 Benthic Macro-invertebrates The Canary in the Coal Mine!
2 What are they? Benthic= Bottom Dwelling Macro= seen with naked eye Invertebrates= no back bone
3 Why monitor them? Macroinvertebrate Biodiversity Index or MBI Relative tolerance to pollutants called a Tolerance Value (Tv)A number line of 1 to 11The lower the number the less tolerant the species is to pollutionStone Fly = 1.5 Tv
4 AdaptationsBased on their primary habitatRiffleRunPool
5 Flat Worm / Planaria Less than 2cm in length Pointed head with two “eye spots”Glide along bottom of the panNo segments
6 Leeches 2 cm to 5cm long Segmented Thin head and fat tail regions Two movements in the panUndulated swimmingInch worm along bottom of pan
8 Aquatic Worm Looks like a terrestrial worm Light brown in color SegmentedUp to 10 cm longWill crawl along bottom of the pan
9 Blood Worms Very small and thin Up to 2cm long Looks like a tiny red hair in the panThey can be found floating and sometimes wiggling on bottom of the panGet their name from color, they have nothing to do with blood
18 Crawling Mayfly Three tails Gills along abdomen Long thin bodies Up to 2 cm long, but usually smaller in our creek 1cmWing pads on abdomen
19 Clinging Mayfly Up to 2cm long Colors vary Look like they “work out” incredible legs for clinging to rocks in fast currentsLarge eyes3 tails
20 Swimming MayflyThree or two tailed. In our creek mainly 3 tailed. The two outer tails curve away and the gills are much longer and have a furry appearance
21 Torpedo MayflyLook a little like the swimming mayfly but torpedo’s have a humped back
22 Burrowing Mayfly These mayflies have a very Furry appearance. There gillsAre all over their bodies making themLook hairy.We have found these in our creek, butHave not found them in the past severalYears.
25 Stone Fly TWO TAILS ONLY Distinctive coloration- turtle shell markings Very strong and hardy lookingWe do find these in our creek but have not for two yearsIs it a mayfly or a stone fly? ASK YOUR TEACHER TO MAKE SURE! WE NEED TO DOCUMENT THIS SPECIES!
26 Alderfly Reddish brown head Lighter colored abdomen Long gill filaments off the side and a long single filament off rear endLarge mandiblesCan be 1 cm to 4 cm longLION of the creek so get it out of your pan quick- it will eat everything else in a short amount of time!
27 Dobson Fly Large mandibles Dark Color Short dark gill spikes off abdomenOTHER LION of the creek. Remove immediately after documenting or you will have nothing else to count! : )
29 Water Penny Not to be confused with an Aquatic Sow bug! Reminds me of a scab from the top and looks like an alien from the underside!Oval shaped, brown and up to 1cm long in our creekThis photo enhanced with color, naturallyWhite in color
31 Riffle Beetle In these case we count both the adults and larva. Adults will be up to 3cm in size, black and their legs look like ribbonsThe larva are light brown and with dark heads but only one armoring
32 Side by Side Comparison Riffle Beetle Larva- they sometimesCurl into a C-shape so not the armoringCaddis- Hydropsychidae
33 Predacious Diving Beetle We typically only find the adult. We count the adult and the larva.Larva has a distinctive rounded head and these larva are big.
34 Broad Winged Damsel Fly Gills located at the tail, three large feathering looking appendagesCan be 3 cm long
35 Narrow Winged Damsel Fly These guys typically look scary to studentsLonger pointed antennae, very long legsLong feathery gills on tail as well
42 Crane Fly Not a worm, but does look A little like a fat caterpillar Greenish in colorVaries from 2cm to 6cm longTypically very big this time of year,They are responsible for shreddingAll of the leaves that fall in the creekSearch leaf packs for them
43 Snipe Fly Also look like a caterpillar BUT they have suction cup feet Usually a reddish brown colorAlso can have feathery antennae
50 CrayfishYes, they are fun, but they do not determine water quality and we do not count themSo, let them go please!IF YOU FIND ONE THAT HAS RED PATCHES ON THE BODY, please show it your teacher. It may be invasive
51 FishJohnny Darter- commonWe do not count fish and for their safety do not want you to keep them in your pan.If you do find a fish do show it to your teacher so that we can determine if it is one of the following fishSculpin- some species are EndangeredRainbow Darter- EndangeredRound Goby- Invasive
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