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首页> 外文期刊>Marine ecology >Experimental assessment of Posidonia oceanica-associated gastropods grazing on an early-successional biofilm community: nutrient availability and species-specific effects
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Experimental assessment of Posidonia oceanica-associated gastropods grazing on an early-successional biofilm community: nutrient availability and species-specific effects

机译：在早期成功的生物膜群落上放牧与波西多尼亚海洋相关的腹足类动物的实验评估：养分有效性和物种特异性效应

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摘要

Although grazing is considered an essential process controlling epiphyte biomass on seagrass leaves, there is still a lack of fundamental knowledge about the species-specific consumption rates of the most common grazers in Mediterranean meadows. This study experimentally assessed the effect of Posidonia oceanica-associated gastropod grazing on early successional biofilm and the species-specific relationship between biofilm consumption rates and biofilm biomass. Two biofilms on artificial substrata, both developed insitu (in a P.oceanica meadow), one under ambient conditions and the other under nutrient-enriched conditions, were offered in aquaria assays to nine species of grazers found in P.oceanica meadows. Biofilm consumption rates and their association with biofilm biomass were assessed. It was found that: (i) there was a positive association between biofilm consumption and biofilm biomass up to 20mg Chl am(-2) for Bittium reticulatum, Gibbula ardens, Jujubinus exasperatus and Tricolia pullus; (ii) Alvania montagui, B.reticulatum and Jujubinus striatus showed the highest consumption rates and are thus expected to be amongst the leading consumers in early-successional epiphytic communities; (iii) there was not an increase of consumption rate when a substratum colonized under nutrient-enriched conditions was offered to any of the nine studied species. This study provides species-specific consumption rates knowledge that is useful for the assessment of the strength of grazer-epiphyte interactions and trophic fluxes in P.oceanica meadows.
机译：尽管放牧被认为是控制海草叶上附生生物量的重要过程，但仍然缺乏有关地中海草甸最常见的放牧者特定物种消费率的基本知识。这项研究实验评估了波西多尼亚海洋相关腹足动物放牧对早期演替生物膜的影响以及生物膜消耗速率和生物膜生物量之间的物种特异性关系。在水族箱测定中，为在海洋草甸中发现的九种食草动物提供了两种在人工基质上的生物膜，它们都在原地（在海洋草甸上）发育，一个在环境条件下生长，另一个在营养丰富的条件下生长。评估生物膜消耗率及其与生物膜生物量的关系。已发现：（i）网状,、 Gibbula ardens，Jujubinus exasperatus和Tricolia pullus的生物膜消耗量和生物膜生物量之间的正相关关系，直至20mg Chl am（-2）。 （ii）Alvania montagui，B.reticulatum和Jujubinus striatus的消费率最高，因此有望成为早期成功附生群落的主要消费者之一； （iii）当向九种研究物种中的任何一种提供在营养丰富条件下定殖的基质时，食用率没有增加。这项研究提供了特定于物种的消耗速率知识，可用于评估大洋。草地上食草动物-表生植物相互作用和营养通量的强度。

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