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首页> 外文期刊>Marine ecology progress series >Mesograzer interactions with a unique strain of Irish moss Chondrus crispus: colonization, feeding, and algal condition-related effects
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Mesograzer interactions with a unique strain of Irish moss Chondrus crispus: colonization, feeding, and algal condition-related effects

机译:中殖民国与爱尔兰苔藓苔藓脆节的独特菌株相互作用:殖民化,喂养和藻类状况相关的效果

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Marine macroalgae are exposed to multiple sources of stress. As a result, perennial macroalga habitats have become depleted in many coastlines. Here, we investigated the role of mesograzers in the sharp decline of a unique strain of Chondrus crispus (the giant Irish moss) found solely in a lagoon in Atlantic Canada. This study was prompted by damage resembling grazing scars that appeared on the fronds as the population declined, for which no grazer had been identified. We identified potential grazers of the seaweed by deploying 4 types of experimental clumps of giant Irish moss and sampling the epifauna that colonized them. Laboratory assays were then run with an abundant species, the amphipod Gammarus oceanicus, to measure feeding rates and test whether this mesograzer is capable of consuming the alga and creating measurable damage. G. oceanicus readily consumed the Irish moss at a grazing rate of 5.24 mg amphipod(-1) d(-1) and created deep lateral grazing wounds similar to those observed in the field. An additional experiment was conducted to assess whether a co-acting stressor in the lagoon, the accumulation of fine sediments, could explain the appearance and spatially patchy distribution of the damage in the population. Giant Irish moss fronds that had been buried under sediment lost twice as much biomass as those that had not. These results suggest that grazer activity and declining conditions in the lagoon have a negative and additive effect on this unique strain of Irish moss, with clear implications for its restoration.
机译:海洋大草原暴露于多种压力来源。因此,多年生大型巨大栖息地在许多海岸线中耗尽。在这里,我们调查了中间丛中的角色在独特的软骨脆节(巨型爱尔兰苔藓)的急剧下降中,仅在大西洋加拿大的泻湖中发现。这项研究是通过类似于放牧疤痕的损害提示,随着人口拒绝,由于人口拒绝,因此没有被识别出来。我们通过部署4种类型的巨型爱尔兰苔藓和殖民地殖民地的Epifauna来确定海藻的潜在格拉塞尔。然后用丰富的物种,Amphipod Gammarus Oceoicus进行实验室测定,以测量饲养速率并测试该中间粒草是否能够消耗藻类并产生可测量的损坏。 G. Oceoicus以5.24mg Amphipod(-1)D(-1)的放牧率容易消耗爱尔兰苔藓,并产生与在该领域中观察到的深度侧面放牧伤口。进行了额外的实验,以评估泻湖中的共同作用压力,细沉积物的积累是否可以解释群体损害的外观和空间斑块分布。巨人的爱尔兰苔藓融合在沉积物下埋葬了两倍的生物量,因为那些没有。这些结果表明,泻湖的食草活动和下降条件对这种独特的爱尔兰苔藓菌株具有消极和添加剂影响,并对其恢复有明显的影响。

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