COMPARATIVE ANALYSIS OF EPIPHYTIC FORAMINIFERA IN SEDIMENTS COLONIZED BY SEAGRASS POSIDONIA OCEANICA AND INVASIVE MACROALGAE CAULERPA SPP.
COMPARATIVE ANALYSIS OF EPIPHYTIC FORAMINIFERA IN SEDIMENTS COLONIZED BY SEAGRASS POSIDONIA OCEANICA AND INVASIVE MACROALGAE CAULERPA SPP.
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海草 posidonia oceanica 与入侵巨藻 Caulerpa SPP 定殖沉积物中附生有孔虫的比较分析。
DOI：
10.2113/gsjfr.40.2.134
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发表时间：
2010
影响因子：
1.1
通讯作者：
B. Rodríguez
中科院分区：
文献类型：
--
作者：
G. Mateu‐Vicens;A. Box;S. Deudero;B. Rodríguez
地中海浅水软底的特点是广泛的草甸特有的海草Posidonia oceanica（L.）支持丰富的底栖生物群，包括许多附生有孔虫类群的Delile。附生植物群落的生物量随海洋大滨藜周期的变化而变化，特别是在夏季，当叶面积最大时，影响那些丰度较高的类群。在过去的几十年里，外来的大型植物物种入侵栖息地以前占主导地位的P. oceanica。其中两个分类群是绿色藻类Caulerpa taxifolia（Vahl）Agardh，1817和C. racemosa（Forsskal）Agardh，1873，沿着非侵入性的C. Prolifera（Forsskal）Lamouroux，1809，产生防御性的次级代谢物，如影响P. oceanica叶周转率的蕨烯。由于藻类基质的不同结构特征，蕨藻取代了海洋原藻。导致从复杂的三维、长持续时间的基底变成具有较短寿命的较简单的二维基底。
附生有孔虫可根据其形态、结构、行为和寿命分为功能群。死亡有孔虫化石共110种，其中43种来自大洋前体（P. oceanica）的沉积物，82种来自C. prolifera，78个。taxifolia和C.总状花序。所有组合的分类组成是相似的，尽管每个分类群的相对丰度存在差异。P. oceanica草甸的沉积物以平坦、结壳、寿命长的物种（例如，Planorbulina mediterranensis d 'Orbigny，1826），而在蕨藻属（Caulerpa spp.）栖息地，暂时能动，寿命较短的类群（例如，叶瓣花（Lobatula lobatula，步行者and Jacob，1798）和罗莎琳娜·布雷迪·库什曼（Rosalina bradyi Cushman，1915）倾向于占优势。多变量分析表明，只有P. oceanica沉积物的死亡群落才能代表P. oceanica附生有孔虫组合（Planorbulinatum medi-Escherensae Colom，1942）。因此，有孔虫组合之间的差异，在沉积物中的殖民地不同植物基质发生之前，埋藏和溶解过程，并可能适用于古生态解释。
Mediterranean shallow-water soft bottoms are characterized by extensive meadows of the endemic seagrass Posidonia oceanica (L.) Delile that support abundant benthic biota including numerous epiphytic foraminiferal taxa. The biomass of the epiphytic communities varies with the P. oceanica cycle, especially influencing those taxa with higher abundances in summer, when the foliar surface is maximum. During the past decades exotic macrophyte species have invaded habitats formerly dominated by P. oceanica . Two of these taxa are the green algae Caulerpa taxifolia (Vahl) Agardh, 1817 and C. racemosa (Forsskal) Agardh, 1873, that, along with the non-invasive C. prolifera (Forsskal) Lamouroux, 1809, produce defensive, secondary metabolites such as caulerpenyne that affects turnover rates of P. oceanica leaves. As a consequence of different architectural features of the algal substrate, replacement of P. oceanica by Caulerpa spp. results in the change from a complex three-dimensional, long duration substrate into a simpler, two-dimensional one with a shorter life span.
Epiphytic foraminifers can be clustered into functional groups according to their shape, structure, behavior and life span. The foraminiferal dead assemblage includes a total of 110 species, that included 43 species in sediments colonized by P. oceanica , 82 species in sediments with C. prolifera , 78 in sediments invaded by C. taxifolia , and 55 in sediments invaded by C. racemosa . Taxonomic composition of all assemblages is similar, though differences occur in the relative abundance of each taxon. Sediments in P. oceanica meadows are characterized by flat, encrusting, long life-span species (e.g., Planorbulina mediterranensis d’Orbigny, 1826), whereas in Caulerpa spp. habitat, temporarily motile, shorter life-span taxa (e.g., Lobatula lobatula (Walker and Jacob, 1798) and Rosalina bradyi Cushman, 1915) tend to dominate. Multivariate analysis shows that only the thanathocoenosis of P. oceanica sediments is representative of the P. oceanica epiphytic foraminiferal assemblage ( Planorbulinatum medi-terranensae Colom, 1942). Hence, differences among the foraminiferal assemblages in sediments colonized by different phytal substrates occur prior to taphonomic and dissolution processes and may be applicable to paleoecological interpretations.