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INSECT ECOLOGY -- ENTOMOLOGY/BIOLOGY 127 LECTURE 2 – POPULATION AND CHARACTERISTICS OF POPULATIONS I. What is a population? Definitions and characteristics. A. Definition: Population a group of potentially interbreeding individuals that share common characteristics and occupy a particular space at a particular time . B. Examples. 1. Broad usage: The insect population of the UCR campus between 2005 and 2007. Not a very satisfactory definition! 2. Species usage: The Culex tarsalis , a mosquito, population of a wetland during 2008. 3. Sub-specific usage: The population of tiger beetles exhibiting a yellow stripe on the margins of dark green elytra living on a sand dune within the dark green beetle population of Cape Hatteras between April and October 2008. C. Special cases and points. 1. Deme a local group of interbreeding individuals, a local population of a single species . Local units of a metapopulation. e.g., bay checkerspot butterflies ( Ephydra editha bayensis ) in Santa Clara County. Use plantain ( Plantago erecta ) as the host plant for catepillars. The distribution of the plant is determined by the distribution of serpentine soils. 2. Single species population -- the most frequent usage. For this course, we will use population to refer to an ecological unit (a group of individuals within a defined space; not all possible populations of a particular species) that also make up an evolutionary unit (a group of individuals that have the potential to exchange genes). 3. Partial populations (or subpopulations )-- For insects, this refers to the populations of different developmental stages, e.g. the egg population, the first instar population, the x larval stage population, the pupal population and the adult population for holometabolous insects. The egg population, the populations for each nymphal stage and the adult population can be used for hemimetabolous insects. Lecture 2, page 1
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Holometabolous: complete metamorphosis; endopterygote summed to give a “total population curve” Egg egg larva 1 adult larva 1 Frequency larva 2 or # of pupa individuals adult pupa larva 2 larva n Time Hemimetabolous: incomplete metamorphosis; exopterygote Egg egg nymph 1 nymph 1 Frequency nymph 2 adult or # of nymph 3 individuals adult nymph 2 nymph n Time II. Population characteristics.
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This note was uploaded on 02/10/2009 for the course BIO Bio 5A taught by Professor Zhu,rao during the Spring '08 term at UC Riverside.

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