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Spatial variability in macrofaunal diet composition and grazing pressure on microphytobenthos in intertidal areas
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2020-07-13 , DOI: 10.1002/lno.11554
Tisja D. Daggers 1 , Dick Oevelen 1 , Peter M. J. Herman 2, 3 , Henricus T. S. Boschker 4, 5 , Daphne Wal 1, 6
Affiliation  

Microphytobenthos forms an important part of the diet of macrofauna (macrozoobenthos) in many intertidal ecosystems. It is unclear, however, whether the dependence of macrofauna on microphytobenthos varies spatially within and among tidal systems. We aim (1) to assess the spatial variability in the importance of microphytobenthos in the diet of macrofauna (i.e., between and within two tidal basins and as function of elevation), (2) to quantify grazing pressure of the macrofaunal community on different potential food sources (microphytobenthos, phytoplankton and terrestrial organic material) for several sites in two tidal basins and (3) to compare microphytobenthic production and summer/autumn grazing of the total macrofaunal community and grazing pressure per feeding type, with potential microphytobenthic production estimated from rates in early spring, when grazing was low. Using a natural stable isotope approach, we identified microphytobenthos as a more important food source for macrofauna than phytoplankton and terrestrial organic material. Microphytobenthos dependency differed between tidal basins for the genera Bathyporeia (sand digger shrimp), Macoma (Baltic tellin), and Peringia (mudsnail) and for sampled individuals of all genera combined, and did not vary as function of elevation. We showed that macrofaunal grazing on microphytobenthos is quantitatively important and, in some cases, approached microphytobenthic production rates in early spring. No positive relation between microphytobenthic production in early spring and macrofaunal grazing in summer/autumn was observed. This suggests that the studied consumer-resource interactions are coupled on a larger spatial scale (i.e., mesoscale, ≈10 to 100 km), rather than the fine (mm to m) scale.

中文翻译:

大型动物饮食组成的空间变异性和潮间带小型底栖动物的放牧压力

在许多潮间带生态系统中,底栖微型植物是大型动物(大型底栖动物)饮食的重要组成部分。然而,尚不清楚大型动物群对底栖微型植物的依赖是否在潮汐系统内部和潮汐系统之间存在空间变化。我们的目标是 (1) 评估微型底栖动物在大型动物饮食中的重要性的空间变异性 (即,在两个潮汐盆地之间和内部以及作为海拔的函数),(2) 量化大型动物群落在不同潜力下的放牧压力两个潮汐盆地中几个地点的食物来源(微型底栖动物、浮游植物和陆地有机物质),以及 (3) 比较微型底栖动物的产量和整个大型动物群落的夏季/秋季放牧以及每种喂食类型的放牧压力,根据早春低放牧时的速率估计潜在的微型底栖动物产量。使用天然稳定同位素方法,我们确定微型底栖动物是大型动物比浮游植物和陆地有机物质更重要的食物来源。底栖微植物对底栖微植物的依赖性在海水盆地(挖沙虾)、Macoma(波罗的海泰林)和 Peringia(泥螺)的潮汐盆地以及所有属的样本个体之间存在差异,并且不随海拔变化而变化。我们表明大型底栖动物放牧在数量上很重要,在某些情况下,在早春接近微型底栖动物的生产率。早春小型底栖植物产量与夏/秋季大型动物放牧之间没有观察到正相关关系。
更新日期:2020-07-13
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