Food Web Database

The food webs are based on published studies of various types of habitat. The original food web matrix is not a square matrix.  It contains m columns of predators and n rows of preys with a 1 at the intersection to indicate a direct feeding relation. We converted the original food web matrix into a community matrix and set a_ij = -1 and a_ji = 1 if species i feeds on species j. You can decide if a self-loop is added to each species or to the primary producer.

Web Number:
1 ,	2 ,	3 ,	4 ,	5 ,	6 ,	7 ,	8 ,	9 ,	10 ,	11 ,	12 ,	13 ,	14 ,	15 ,
16 ,	17 ,	18 ,	19 ,	20 ,	21 ,	22 ,	23 ,	24 ,	25 ,	26 ,	27 ,	28 ,	29 ,	30 ,
31 ,	32 ,	33 ,	34 ,	35 ,	36 ,	37 ,	38 ,	39 ,	40 ,	41 ,	42 ,	43 ,	44 ,	45 ,
46 ,	47 ,	48 ,	49 ,	50 ,	51 ,	52 ,	53 ,	54 ,	55 ,	56 ,	57 ,	58 ,	59 ,	60 ,
61 ,	62 ,	63 ,	64 ,	65 ,	66 ,	67 ,	68 ,	69 ,	70 ,	71 ,	72 ,	73 ,	74 ,	75 ,
76 ,	77 ,	78 ,	79 ,	80 ,	81 ,	82 ,	83 ,	84 ,	85 ,	86 ,	87 ,	88 ,	89 ,	90 ,
91 ,	92 ,	93 ,	94 ,	95 ,	96 ,	97 ,	98 ,	99 ,	100 ,	101 ,	102 ,	103 ,	104 ,	105 ,
106 ,	107 ,	108 ,	109 ,	110 ,	111 ,	112 ,	113 ,

Title: Summer bottom fauna of the Mississippi River above Dam 19 Citation: Keokuk, Iowa, Ecology 49:162-168 (1968). Year: 1968 # of species 21 Add self-loop to only primary producers Add self-loop to all species Community Matrix:   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 1 -1 0 -1 -1 -1 -1 0 0 0 -1 0 0 0 0 0 0 0 0 0 -1 0 2 0 -1 0 0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 -1 0 0 0 3 1 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 -1 0 -1 0 -1 0 4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 0 0 0 -1 0 5 1 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 -1 -1 -1 0 -1 0 6 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 0 -1 0 7 0 1 0 0 0 0 0 0 0 -1 -1 -1 0 0 0 0 0 -1 0 0 0 8 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 0 -1 0 9 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 -1 0 0 0 10 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 -1 -1 -1 0 0 0 11 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 -1 -1 -1 0 0 0 12 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 -1 0 -1 0 -1 -1 13 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 -1 0 -1 0 0 0 14 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 15 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 -1 0 -1 0 0 0 16 0 0 1 1 1 1 0 1 1 1 1 1 1 0 1 0 0 -1 0 0 0 17 0 0 0 0 1 1 0 1 0 1 1 0 0 0 0 0 0 0 0 0 -1 18 0 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 -1 -1 -1 19 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 -1 20 1 0 1 1 1 1 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 21 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 0 0 Species# Species 1 detritus 2 phytoplankton 3 burrowing ephemerids 4 Oligochaeta 5 Chironomidae 6 Gastropoda 7 zooplankton 8 Amnicolidae 9 herbivorous insects 10 Pelecypoda 11 Potamya 12 macrocrustacea 13 oecetis 14 Sialis 15 carnivorous Diptera 16 Gomphus 17 ducks (Lesser Scaup) 18 benthos-eating fish 19 piscivorous fish 20 Hirudinea 21 mammals