[揽瓜阁精读] 158.Snowshoe hare

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文章主旨：the factors of effecting predation risk on the behaviour and population dynamics of snowshoe hares

文章结构：
1. 作者自述，介绍bg
作者：adopting predator avoidance may influence population dynamics of hares

2. 描述实验以及结果
四个实验组：
(1) fence （Predation risk is low)
(2) food
(3) fence + food
(4) NONE
三个假说：
(1) food: body mass+ survive-
(2) PA: survive+ mass-
(3) PSF: both- (cuz trade-off)
RESULTS:
(1) control: risk++ --> mass & fecundity --
(2) similary reduction
(3) fence+food: mass&fecundity +
(4) fence: mass did not decline

SUPPORT RSF （present control&food) & food (absent fence & fence+food)

结论：
--hares' ability to reduce exposure is limited （能力弱）
--旧实验：hare的压力会随着population的下降而上升
--作者：由PR调节的环境危险度会引起一个lag（数量减少？）

chow=food
twigs 小枝
lag 落后于、时间间隔