Cylindrospermopsis raciborskii (Cyanobacteria) invasion at mid-latitudes:: Selection, wide physiological tolerance, or global warming?
Cylindrospermopsis raciborskii (Cyanobacteria) invasion at mid-latitudes:: Selection, wide physiological tolerance, or global warming?
复制标题
DOI：
10.1111/j.1529-8817.2004.03118.x
复制
发表时间：
2004-04-01
影响因子：
2.9
通讯作者：
Dufour, P
中科院分区：
文献类型：
--
作者：
Briand, JF;Leboulanger, C;Dufour, P
热带水华形成蓝藻 Cylindrospermopsis raciborskii (Woloszynska) Seenaya et Subba Raju 由于其潜在毒性和中纬度地区的入侵行为而引起越来越多的关注。该物种最近在几个温带地区被发现，并于 1994 年在法国首次报道，但这种驯化过程背后的机制仍有待阐明。我们进行了一系列实验室实验，试图找出可以解释这种行为的生理特征。我们研究了以下三个假设：1）适应温带气候的 C. raciborskii 克隆在向北推进时被选择，2）C. raciborskii 具有较高的生理耐受性，使其能够在广泛的条件下繁衍生息，3）气候变化（全球变暖）有利于 C. raciborskii 在中纬度地区的发展。来自澳大利亚n=1)、巴西(2)、法国(2)、德国(1)、匈牙利(1)、墨西哥(1)和塞内加尔(2)的10株C. raciborskii在不同温度和光照强度下培养。热带和温带菌株的体外生长参数（mu 和 T-opt）相同。所有10个菌株在较宽的温度（20至35℃）和光强度（30至400 mumol photons.m(-2).s(-1)）范围内均表现出正净生长，在30℃左右和80 mumol photons.m(-2).s(-1)时具有最大生长速率。这表明，C. raciborskii在中纬度地区的定殖可能是其耐受相当广泛的气候条件的能力和全球变暖现象共同作用的结果，这为该物种的生长提供了更好的环境条件。
The tropical bloom-forming cyanobacterium Cylindrospermopsis raciborskii (Woloszynska) Seenaya et Subba Raju is causing increasing concern because of its potential toxicity and invasive behavior at mid-latitudes. This species has recently been identified in several temperate areas and was first reported in France in 1994, but the mechanisms underlying this acclimation process remain to be elucidated. We performed a range of laboratory experiments in an attempt to identify the physiological characteristics that could account for this behavior. We investigated the three following hypotheses: 1) clones of C. raciborskii adapted to temperate climate have been selected as it advanced north, 2) C. raciborskii has high physiological tolerance that allows it to prosper in a wide range of conditions, and 3) changes inclimate (global warming) have favored the development of C. raciborskii in mid-latitudes. Ten strains of C. raciborskii from Australia n=1), Brazil (2), France (2), Germany (1), Hungary (1), Mexico (1), and Senegal (2) were cultured at different temperatures and light intensities. The in vitro growth parameters (mu and T-opt) were the same for the tropical and temperate strains. All 10 strains displayed positive net growth in a wide range of temperatures (from 20 to 35degreesC) and light intensities (from 30 to 400 mumol photons.m(-2).s(-1)), with maximum growth rates at around 30degreesC and 80 mumol photons.m(-2).s(-1). This suggests that the colonization of mid-latitudes by C. raciborskii may result from a combination of its ability to tolerate a rather wide range of climatic conditions and the global warming phenomenon, which provides this species with better environmental conditions for its growth.