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Morphological and molecular evidence for multiple invasions of Codiumfragile in Atlantic Canada

机译:形态和分子证据证明了加拿大大西洋中的脆弱dium的多次入侵

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Since the first collection in 1989 from Mahone Bay (Nova Scotia), the highly invasive green macroalga Codium fragile has been spreading in Atlantic Canada and has become established along the coasts of Nova Scotia, Prince Edward Island and New Brunswick. Considerable morphological variation had been found among thalli from different collection sites. This variation may be caused by the presence of different subspecies, or by phenotypic plasticity of one of the subspecies. Morpho-metric and molecular investigations were performed on Codium collected from seven sites in Maritime Canada and one from Maine to evaluate these hypotheses. Based on both mucron length and ISSR markers, thalli separated into three groups, suggesting multiple introductions of C. fragile into Canada. A group from the eastern shore of Nova Scotia and the coast of New Brunswick is clearly ssp. tomentosoides that likely originates from the United States. A second group, growing in Malpeque Bay in Prince Edward Island, is possibly an asexual variant of ssp. atlanticum, another invasive subspecies of C. fragile. A third group, found in Caribou Harbour only, is an intermediate in terms of both mucron length and molecular data, suggesting a hybrid of ssp. tomentosoides and ssp. atlanticum. The origin of this intermediate group remains to be established.
机译:自1989年首次从新斯科舍省马洪湾(Mahone Bay)收集以来,高度入侵的绿色大型藻类脆性Co虫已经在加拿大大西洋传播,并已在新斯科舍省,爱德华王子岛和新不伦瑞克省沿海建立。在不同收集地点的塔利中发现了相当大的形态变异。这种变化可能是由于存在不同的亚种,或者是其中一个亚种的表型可塑性引起的。对从加拿大海事局的七个地点和缅因州的一个地点收集的钴进行了形态计量和分子研究,以评估这些假设。根据mucron长度和ISSR标记,thalli分为三类,这表明脆弱的梭状芽胞杆菌已多次引入加拿大。来自新斯科舍省东海岸和新不伦瑞克省海岸的一群人显然是ssp。可能来自美国的绒毛类。生长在爱德华王子岛的马尔佩克湾中的第二类可能是无性系的无性繁殖。大西洋,脆弱的梭状芽胞杆菌的另一个入侵亚种。仅在北美驯鹿港中发现的第三组,无论是在μ子长度还是分子数据方面都是中间产物,表明是ssp的杂种。绒毛和ssp。大西洋。该中间基团的起源尚待确定。

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