Data & results

Main Data Table

Graphs and results

Bird biodiversity generally has an inverse relationship with the sound level in decibels. This inverse relationship is stronger when comparing the number of bird species to dB than it is when comparing the total number of birds to dB, but it is still present in both cases. These trends are best demonstrated when removing the outlier T060 (the purpose of which is explained in the conclusion), but can be demonstrated even when all of the data is included. These graphs do not include it. 

20 types of birds appeared in locations with average dB levels at or above 55. The two most commonly found birds in these louder locations are House Sparrows and Barn Swallows, which are common in the previously identified "loud" habitat types. Birds that only appeared in these locations were the Summer Tanager, Marsh Wren, and Common Egret. 35 types of birds appeared in locations with average dB levels below 55, with the two birds with the highest frequencies being the American Robin and the American Goldfinch. Birds that only appeared in these locations were the Grey Catbird, Northern House Wren, Seagull, Green Heron, Canada Goose, American Crow, Red-Eyed Vireo, Cedar Waxwing, Red-bellied Woodpecker, Northern Flicker, Common Grackle, Eastern Phoebe, Great Horned Owl, Wood Thrush, Warbling Vireo, Killdeer, Hairy Woodpecker, and Eastern Wood Pewee.