BIOLOGY 1M03 Lecture Notes - Lecture 10: Senescence, Dusky Antechinus, Commensalism
3 Apr 2018
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Life history: an organisms life or time pattern of growth, differentiation, storage and reproducttion, with a goal to increase successful decedents: involves trade offs: growing fast and large verses reproducing lots & early. Fecundity: number of offspring produced per reproductive episode. Termination of life: senescent and programmed death. Physella virgata (snail): does not need partner to reproduce. Found nails in head waters in a stream. Grow to 4mm and then reproduction starts early. Downstream: much larger, grew to 10mm, reproduction started a little later on. Collected snails & cray sh ( which hunted downsyteam snails) Chemistry of water is going to in uence the snail. Overall, snails in water with cray sh are going to grow longer before they reproduce. Some chemical released when cray sh ate snails, affected the life history of the snails by then growing bigger before the reproduce, and longer life length. Rates are plastic: they can change their life route at any time.
