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: Litoraalin merkitys Pyhajarven kalatuotannolle Citation: Sakylan Pyhajarven Tila Ja Biologinen Tuotanto (Lounais-Suomen Vesiensuojeluyhdistys R. Y., Turku, Finland, 1981) 47:173-176. Year: 1981 # of species 25 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 22 23 24 25 1 -1 0 0 0 -1 0 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 2 0 -1 0 0 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 -1 0 0 0 0 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 -1 0 0 0 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 0 0 -1 0 0 5 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 6 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 0 0 0 0 0 0 7 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 0 0 0 -1 0 8 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 -1 -1 -1 -1 0 -1 -1 9 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 0 0 0 10 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 -1 -1 -1 0 0 -1 11 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 0 0 0 0 0 12 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 -1 -1 0 -1 0 0 -1 13 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 -1 0 0 -1 14 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 -1 0 0 0 0 0 15 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 -1 -1 -1 -1 -1 0 0 0 0 0 16 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0 -1 0 0 -1 17 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 0 0 0 0 0 0 -1 0 0 -1 18 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 -1 0 0 0 19 0 0 0 1 0 0 1 1 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 20 0 0 0 1 0 0 1 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 21 0 0 0 0 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 1 1 1 0 1 1 0 0 1 1 1 0 0 0 0 0 0 0 23 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 24 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 -1 25 0 0 0 0 0 0 0 1 0 1 0 1 1 0 0 1 1 0 0 0 0 0 0 1 0 Species# Species 1 phytoplankton 2 suspended detritus 3 aquatic plants 4 sedimented detritus 5 keratella, kellicottia 6 codonella, vorticella 7 daphnia, bosmina 8 sida, eurycercus 9 lymnaea, planorbis, goera 10 chironomids 11 stylodrilus 12 ephemera, caenis, heptagenia 13 pisidium, sphaerium 14 nematoda, harpacticoida, cyclopoida, ostracoda 15 asellus 16 polycentropus, molanna 17 ablabesmyia 18 erpobdella, helobdella 19 coregonus albula 21 rutilus rutilus 22 gymnocephalus cernus 23 cyclopoida 24 young fish 25 perca fluviatilis 0