Gerris spinolae Lethierry and Severin (Hemiptera: Gerridae) and Brachydeutera longipes Hendel (Diptera: Ephydridae): Two Effective Insect Bioindicators to Monitor Pollution in Some Tropical Freshwater Ponds under Anthropogenic Stress

Figure 8

Relation between temperature of water and abundance of (a) Brachydeutera longipes (Hendel) and (b) Gerris spinolae (Lethierry and Severin) as shown by regression analysis.

(a)

(b)