BIOB50H3 Lecture Notes - Lecture 16: Kit Fox, Flatfish, Golden Eagle
Document Summary
Biob50winter2012 lecture 16/20: energy flow and food webs (chapter 20) In terrestrial ecosystems, only a small portion of the biomass is consumed, and most of the energy flow passes through the detritus. In terrestrial ecosystems, energy and biomass pyramids are usually similar because biomass is closely associated with energy production. Stellar sea lion case study: stellar sea lion populations in alaska declines about 80% over 25 years smaller body size and decreased birth rates suggested food quantity or quality might be a problem. 20. 2: this shows that the stellar sea lions were eating more cod and pollock (lower in energy and fat) and less of the higher quality food which was herring, capelin and etc. Resulted in smaller body size and decreased birth rates. 6: the presence of the beetle resulted in greater consumption of ants Greater consumption of ants allowed increased rates of herbivory on piper trees
