Physiological limits to inshore invasion of Indo-Pacific lionfish (Pterois spp.): insights from the functional characteristics of their visual system and hypoxia tolerance
Physiological limits to inshore invasion of Indo-Pacific lionfish (Pterois spp.): insights from the functional characteristics of their visual system and hypoxia tolerance
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DOI：
10.1007/s10530-020-02241-5
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发表时间：
2020-03-16
影响因子：
2.9
通讯作者：
Brill, Richard W.
中科院分区：
文献类型：
--
作者：
Hasenei, Aaron;Kerstetter, David W.;Brill, Richard W.
印度太平洋狮子鱼（Pterois spp.）从北卡罗来纳州到巴西中部，在整个加勒比海、墨西哥湾和大西洋西部沿海地区建立了自己的公司。狮子鱼也可能入侵河口，因为它们能忍受低至千分之四的盐度。我们假设，他们的视觉系统的功能特性（在印度太平洋清澈的热带沃茨中进化）或他们无法忍受缺氧将限制狮子鱼占据这些地区的能力。我们用角膜视网膜电图评估前者，用呼吸流量计评估后者。狮子鱼视觉系统的发光灵敏度，时间分辨率（量化为闪烁融合频率）和光谱灵敏度与本地鱼类相似，表明它们的视觉系统在河口光条件下具有功能，并允许狮子鱼成为有效的鱼类。相比之下，急性暴露于减少氧气水平（相当于通常发生在大西洋中部和墨西哥湾河口）超过了狮子鱼的生理耐受性。因此，我们得出结论，缺氧将控制或限制河口入侵。
Indo-Pacific lionfish (Pterois spp.) have become established throughout the Caribbean and the coastal regions of the Gulf of Mexico and western Atlantic Ocean from North Carolina to central Brazil. Lionfish may also invade estuaries, as they tolerate salinities down to 4 parts per thousand. We hypothesize that the functional characteristics of their visual system (which evolved in the clear tropical waters of the Indo-Pacific) or their inability to tolerate hypoxia will limit the capacity of lionfish to occupy these areas. We assessed the former with corneal electroretinography and the latter with intermittent-flow respirometry. The luminous sensitivity, temporal resolution (quantified as flicker fusion frequency), and spectral sensitivity of the lionfish visual system are like those of native piscivores, indicating that their visual system will be functional under estuarine photic conditions and allow lionfish to be effective piscivores. In contrast, acute exposure to reduced oxygen levels (equivalent to those commonly occurring in mid-Atlantic and Gulf of Mexico estuaries) exceeded the physiological tolerances of lionfish. We therefore conclude that hypoxia will control or limit estuarine invasion.