BIOL 180 Lecture 27:02 & 04:03

05 in0012 and mats pike d 6880 0374l se 0066 regres

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Unformatted text preview: rol: D 0.391 differ (P> SE = <0.001), but slopes did not ÷ 0.315L, 0.05) In0.012; and Mat’s pike: D 6.880 + 0.374L, SE = 0.066. Regres either pond. sIons were significantly different between treat ments in both ponds (analysis of SCIENCE • P VOL. 258 • 20 NOVEMBER 1992 covariance, <0.001), but slopes did not differ (P> 0.05) In either pond. SCIENCE 258 1349 Body depth (mm) Body d Effects Of Predators On Prey Populations Do Predators Reduce Prey Populations Below Carrying Capacity? - Predators can control prey populations. - More likely to occur when predators exhibit: 1. High reproductive capacity. 2. Strong dispersal powers. 3. Ability to switch to alternative food resources. ***If the organism has these three characteristics, in general, you are more likely to be able to keep a prey population quite below its carrying capacity*** Ex. Cyclamen mites (Tarsonemus pallidus) and predatory mite Typhlodromus CHAPTER 18 348 60. KEY Cyclamen mite (prey) Typhiodrornus (predator) 40 20 > a) C 0 .9 60 p - p - I Figure 18.3 Predators can control prey populations. Infestation of strawberry plots by cyclamen mites (Tarsonemus pallidus) in the presence of the predatory mite Typhiodromus (above) and in its absence (below). Prey populations are expressed as numbers of mites per leaf; predator levels are the numbers of leaflets out of 36 on which one or more Typhiodromus were found. Parathion treatments are indicated by “p.” After C. B. Huffaker and C. E. Kennett, Hilgardia 26:191 —222 (1956). Photo of Typhiodromus courtesy of 1PM Program, Cornell University. 0. 40 20. M —1k A SON Month Consu...
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