BIOL 11000 Lecture Notes - Lecture 18: Primary Succession, Trophic Level, Moraine

• School: Purdue University
• Department: Biological Sciences
• Course: BIOL 11000
• Professor: Dr.Anderson

Document Summary

Productive--the amount of biomass (total mass of all individuals in population) they produce. Stable--the ability to withstand and recover from environmental stresses. Resistant to invasive species (those established outside their native range) Structure & dynamics of community affected by feeding relationships between organisms in different trophic levels. Trophic level: an organism"s position in a food chain/food web. Food chain/food web: the transfer of food energy up trophic levels. Primary producers are autotrophs, make energy from sun available (all other trophic levels are heterotrophs) Pri(cid:373)ar(cid:455) (cid:272)o(cid:374)su(cid:373)ers eat pri(cid:373)ar(cid:455) produ(cid:272)ers e(cid:454)a(cid:373)ple: pla(cid:374)t is eate(cid:374) (cid:271)(cid:455) ph(cid:455)topla(cid:374)kto(cid:374) Se(cid:272)o(cid:374)dar(cid:455) (cid:272)o(cid:374)su(cid:373)ers eat pri(cid:373)ar(cid:455) (cid:272)o(cid:374)su(cid:373)ers e(cid:454)a(cid:373)ple: zoopla(cid:374)kto(cid:374) eats ph(cid:455)topla(cid:374)kto(cid:374) An organism can occupy more than one trophic level. Example: opossum shrimp are both primary and secondary consumers. Detritovore: eats decaying organic matter, returning nutrients to soil. Some species have especially large impact on communities because they. Their impact occurs through trophic interactions and/or their influence on the physical environment.