ENSC 320 Lecture 11: ENSC 320 - Week 6 Lect 1 (L10)

• School: Queen's University
• Department: Environmental Studies
• Course: ENSC 320
• Professor: Ryan K Danby

Document Summary

Indirectly affected (eg. by loss of food: pollutant could affect the environment or resources that organism relies on. Biomagnification: (cid:862)pro(cid:272)ess (cid:449)here(cid:271)y tissue (cid:272)o(cid:374)(cid:272)e(cid:374)tratio(cid:374)s of (cid:272)he(cid:373)i(cid:272)al i(cid:374)(cid:272)rease as it passes up the food (cid:272)hai(cid:374) through t(cid:449)o or (cid:373)ore trophi(cid:272) le(cid:448)els(cid:863) (cid:894)no(cid:449)ell et al. 1999(cid:895: of particular concern when chemical does not breakdown in environment, or for (cid:272)he(cid:373)i(cid:272)als that are(cid:374)"t readily (cid:373)eta(cid:271)olized a(cid:374)d are stored i(cid:374) fatty tissue. In arctic canada (1981-1985) eggs from failed nests has shells averaging 20. 2% thinner than normal; eggs from successful nests averaged 16. 1% thinner (court et al. 1990: by 1980s ddt was still having an effect on these birds, by 1964 nesting peregrines were extinct in the eastern us, those still nesting in western us were classified endangered in 1970, two years before. Ddt was banned: later all north american peregrines were listed as either endangered or threatened, populations have recovered somewhat since the ban, supported by protection and restoration efforts.