Placing the North American invasion of Asian carp in a spatially explicit context
Placing the North American invasion of Asian carp in a spatially explicit context
复制标题
将北美对亚洲鲤鱼的入侵置于明确的空间背景中
作者：
Adam M. Lohmeyer;J. Garvey
大头鱼(Hypothalmichthys Nobilis)和银鱼(H.molitrix)已经入侵了密西西比河的大部分地区。目前还不清楚密西西比河上游(UMRS)北部蓄水池的繁殖情况与未蓄水(开放)的南部河段相比如何。从2005年春季到2006年夏季，以及2007年春季的一次，我们量化了池养和开放的UMRS中的幼虫和幼体的产量。然后，我们模拟了池塘中的种群动态，作为明显的繁殖成功的函数。幼虫发生在每年春季的2周左右。开阔河段的峰值密度和表观产卵持续时间较大。当排泄量大，水温达到18℃时，幼虫产量达到高峰。大多数幼虫(97%)出现在开阔河段。在干旱年份，池塘中的低流量可能会限制繁殖成功。模拟表明，通过将水坝视为从下游开放河流(即源头)入侵的屏障，气候条件可能与池中的水流相互作用，通过创建一个孤立的汇来限制种群。
The bighead (Hypothalmichthys nobilis) and silver carp (H. molitrix) have invaded much of the Mississippi River. It is unclear how reproduction in northern impounded pools of the Upper Mississippi River System (UMRS) compares to unimpounded (open) southern reaches. During spring through summer 2005 and 2006 and once in spring 2007, we quantified larval and juvenile production in the pooled and open UMRS. We then simulated population dynamics in pools as a function of apparent reproductive success. Larvae occurred during about 2 weeks each spring. Peak density and apparent spawn duration were greater in the open reach. Larval production peaked when discharge was high plus rising and water temperatures reached 18°C. Most juveniles (>97%) occurred in the open reach. Low flow during drought years in the pools may limit reproductive success. The simulation demonstrated that, by treating dams as barriers to invasion from the lower open river (i.e., a source), climatic conditions may interact with flow in pools to limit populations by creating an isolated sink.