The Big QuestionWhich habitat in Jude’s garden does the carabid beetle prefer? Do they Prefer: Compost Heap, Wood Heap Or Compost Bin? What is the population of the Carabid Beetle in Jude’s Garden?Do Weather Conditions affect sightings?Which type of habitat do they prefer?
Why We Chose This Question Jude: I chose my question because Iwanted to get more skinks in our forest and I LOVE Beetles!!!!!!!Kyle: I chose this question because I want to ﬁnd out more facts on beetles.
Areas Searched The Wood PileLots of wood and leaves underneath the wood. Compost BinLots of food scraps and leaves and EARWIGS!!!! Compost Heap Lots of Grass and thorns and some branches.
Notes We Will use Nail polish to We changed our mark the beetles,as the time spentWe saw that the beetles t wink doesn’t stay on. searching ,fromare moving bet ween the 15 min to 10 minwood pile and the and for our lastcompost bin through the search 20 min.ventilation shafts in thecompost bin. We moved the dark side of the choice-chamber over so It was wet for some tests. we could be sure that it wasn’t just the type of compost they liked. We found out that we We found 6 beetles in should have been the compost heap. looking in the top of We found 9 beetles in the compost bin, not the wood pile. the bottom! We found 12 beetles in the compost bin.
Hypothesis- What WeThink I think that the Carabid Beetles will prefer under the bricks near the compost heap because we used to ﬁnd them there. My Population estimate is about 25 Beetles total. Jude I think that the Carabid Beetles will prefer the compost bin because it’s dry. My Population estimate is about 30 Beetles total. Kyle
Background Info Carabid Beetles The FactsTurn over a rock or log, and youll see dark, shiny beetles running for cover – ground beetles. This diverse group of predators makes the top 10 listof beneﬁcial garden insects. Though hidden by day, at night the Carabids hunt and feed on some of our worst garden pests.Description:The bestway to get to know the ground beetles is to observe some up close. Since most are nocturnal, you can usually ﬁnd them hiding under boards orstepping stones during the day. T using a pitfall trap to collect a few, and check for the telltale Carabid characteristics. ryMost ground beetles are black and shiny, though some display metallic colors. In many Carabids, the elytra are grooved. Look at a ground beetleshind legs, and youll notice the ﬁrst leg segments (the hips) extend backwards over the ﬁrst abdominal segment.Classiﬁcation:Kingdom - AnimaliaPhylum - Arthropoda
Extra InfoFood ChoiceWe found out from awebsite that 73.5% ofall carabids werecarnivores, 8.1% wereherbivores and 19.5%were omnivores. Weare going to use thisinformation tointroduce the carabidsto our school forest toencourage skinks.
MaterialsTwink/Nail Polish: T Mark the Beetles oAn Ice-Cream Container: T store the oBeetles2 Digging Tools: T Dig For the Beetles oCardboard, sellotape and a plastic box forthe choice chamber.Enough time to look!
T Method est Step 1: Look in 1 of selected 3 places for 10 Minutes. Step 2: Mark Beetles with Twink. Step 3:Release Beetles in place found, then look in the other 2 places repeating the process above. Step 4:Record results. Step 5:Next week repeat process and mark if a beetle has Twink on its back.We caught the carabid beetles and marked them with twink so if we found them again we would know we had caught them before. Place cardboard in 4 sections ﬁll sections with compost (1 and 2 are dry and 2 and 3 are dark) Do dark side with cardboard capture beetles for choicechamber
Choice-Chamber 1st test 3rd testResults Dry light: 0 Wet light:12 Dry light:0 Wet light:5 Dry Dark:0 Dry Dark: 3 Wet Dark:3 Wet Dark: 4 Escapees:13 =19/23? Missing beetle:3 2 escapees! 2 Beetles missing 4th test 2nd test Dry light:4 Dry light: 6 Wet light:8 Wet light:7 Dry Dark:1In our Choice-chamber Dry Dark:5 Wet Dark:8 Missing beetle:1 we had:wet light,dry Wet Dark:4 All beetles found!light,dry dark and wet dark. We found out that the carabid beetles prefer wet conditions.
Was my prediction right? Jude: My prediction about where they preferwas incorrect, and my population prediction was wrong by 15 beetles.Kyle: My prediction about where they live, wasincorrect.I was also wrong about how muchthere were.I was off by 10.
Population Count 24 beetles(13 were marked) I copied this from this website: http://www.radford.edu/jkell/mark_rec103.pdf The Mark and Recapture Technique By far the most popular way to measure the size of a population is called the Mark and Recapture Technique. This technique is commonly used by ﬁsh and wildlife managers to estimate population sizes before ﬁshing or hunting seasons. The mark and recapture method involves marking a number of individuals in anatural population, returning them to that population, and subsequently recapturing some of them as a basis forestimating the size of the population at the time of marking and release. This procedure was ﬁrst used by C.J.G. Petersen in studies of marine ﬁshes and F.C. Lincoln in studies of waterfowl populations, and is often referred to as the Lincoln Index or the Petersen Index. It is based on the principle that if a proportion of the population was marked in some way, returned to the original population and then, after complete mixing, a second sample was taken, the proportion of marked individuals in the second sample would be the same as was marked initially in the total population. That is, R (marked recaptures) M (marked initially) ——————————— = ———————————— T (total in second sample) N (total pop. size) By rearrangement we can estimate the population size, N, to be, M*T N = ——— R For example, suppose you took 200 mice out of a forest having an unknown number of mice, put leg bands on them, return them to the forest and let them mix thoroughly. If you then take 250 mice from the forest and ﬁnd 50 of them to be have leg bands, then M = 200, T = 250, R = 50, and the unknown total number of mice (N) could be estimated as: N = M*T/R = (200)(250)/50 = 1000 mice 22x24/13=40 beetles total!
ConclusionThe Carabid Beetles Prefer the Compost Bin,because it is dryer in there. Population:40The Carabids like dry conditions when itsnot raining and they aren’t bothered aboutlight or dark.Temp does affect how many we see because they don’t like the cold.
Future ActionIn the Future We will:We are going to use our information on where the carabids prefer tolive to introduce them to our forest because they are part of a foodchain connected with native birds and skinks because,in our schoolforest, there are not enough insects to attract skinks.We know thisbecause we have done school tests to see how many insects therewere and the numbers were VERY low,especially compared to thelarge amounts in Jude’s garden.