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Propagule composition regulates the success of an invasive seaweed across a heterogeneous seascape
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-11-18 , DOI: 10.1111/1365-2745.13313 Fabio Bulleri 1 , Ezequiel M. Marzinelli 2, 3, 4 , Sofie E. Voerman 4, 5 , Paul E. Gribben 4, 5
中文翻译：
繁殖成分调节跨异质海景的入侵性海藻的成功
更新日期：2019-11-18
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-11-18 , DOI: 10.1111/1365-2745.13313 Fabio Bulleri 1 , Ezequiel M. Marzinelli 2, 3, 4 , Sofie E. Voerman 4, 5 , Paul E. Gribben 4, 5
Affiliation
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- Propagule pressure is acknowledged as a key determinant of invasion success. Nonetheless, the role of morphological or physiological attributes of propagules (i.e. their quality) in regulating invader establishment has been little explored. In particular, no study has investigated how the presence of propagules differing in quality within an inoculum influences establishment across heterogeneous landscapes.
- We experimentally tested the hypothesis that the quality (+Fronds+Rhizoids; +Fronds−Rhizoids; −Fronds+Rhizoids) and the diversity (1, 2 and 3 fragment types) of vegetative fragments of the seaweed Caulerpa taxifolia determine their establishment success across seascapes consisting of bare sediments and patches of the seagrass Zostera muelleri exposed to different disturbance intensities (control, seagrass canopy clipping and total removal).
- After 6 weeks, seaweed biomass, stolon and frond length, frond and rhizoid number were generally greater in unvegetated habitats (bare sediments and total seagrass removal) than full or reduced seagrass canopies. The type and the diversity of types of fragments inoculated had significant effects on the final biomass and morphological features of C. taxifolia only in vegetated habitats. In control plots, inocula of fragments retaining both fronds and rhizoids achieved higher biomass, developed longer stolons and more fronds. In canopy clipping plots, mixed inocula of +Fronds+Rhizoids and −Fronds+Rhizoids fragments had the greatest biomass and stolon length.
- Synthesis. Assessing how propagules differing in quality perform in different habitats might be not sufficient to draw a comprehensive picture of invasion risk, as their establishment can be modulated by both negative and positive interactions among them. Propagule composition should be, therefore, considered as a further dimension of propagule pressure. Our results also suggest that the relevance of specific propagule traits for invader establishment decreases from intact to degraded habitats. Considering propagule size in terms of amount of competent propagules, rather than an absolute measure, would refine our ability of predicting invasion risk across habitats differing in biotic or abiotic conditions.
中文翻译：
繁殖成分调节跨异质海景的入侵性海藻的成功
- 传播压力被认为是入侵成功的关键因素。但是，关于繁殖体的形态或生理特性（即它们的质量）在调节入侵者建立方面的作用很少被探索。特别是，没有研究调查接种物中质量不同的繁殖体的存在如何影响跨异质景观的建立。
- 我们通过实验验证了以下假设：海藻Caulerpa条状植物叶片的营养成分（+叶状+根茎； +叶状-根茎；-叶状+根状茎）和营养碎片的多样性（1、2和3个碎片类型）决定了它们在整个海景中的建立成功由裸露的沉积物和暴露于不同干扰强度（控制，海草冠层修剪和完全清除）的海草Zostera muelleri斑块组成。
- 6周后，在无植被的生境中（裸露的沉积物和总的海藻清除量），海藻的生物量，茎和叶长，叶状和根状茎的数量通常要大于完整或减少的海草冠层。仅在植被生境中，接种的片段的类型和类型的多样性对C.taxifolia的最终生物量和形态特征具有显着影响。在对照样地中，保留叶状体和根状体的碎屑接种获得了更高的生物量，发育了更长的茎和更多的叶状体。在冠层修剪区中，+ Fronds + Rhizoids和-Fronds + Rhizoids片段的混合接种物具有最大的生物量和茎长度。
- 综合。评估质量不同的繁殖体在不同生境中的表现方式可能不足以全面了解入侵风险，因为它们的建立可以通过它们之间的负面和正面相互作用来调节。因此，应将繁殖体成分视为繁殖体压力的另一维度。我们的研究结果还表明，特定繁殖体性状与入侵者建立的相关性从完整的栖息地到退化的栖息地都在降低。考虑有效繁殖体的数量而不是绝对量来衡量繁殖体的大小，将改善我们预测生物或非生物条件不同的生境中入侵风险的能力。
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