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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Macrofaunal responses to pit-mound patch dynamics in an intertidal mudflat: local versus patch-type effects
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Macrofaunal responses to pit-mound patch dynamics in an intertidal mudflat: local versus patch-type effects

机译：对潮间带滩涂坑坑斑块动力学的宏观响应：局部效应与斑块效应

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Biogenic structures created via feeding activities have varying effects on soft sediment communities, altering population dynamics, creating a temporal mosaic of successional patches, and ultimately increasing variation at different spatial scales. This study focused on assessing population responses to pits (P) and mounds (M) in an intertidal mudflat (River Plym, England) in order to determine (a) how these structures (max size 1400 cm~2), and their formation, affected infauna and (b) to what extent local variations in ambient communities may have affected infaunal responses. Densities in 0- and 1 -week-old pits were significantly lower than in ambient and mound areas for most of the dominant infauna over the study period. Abundances were higher in mounds for some species and responses to both structures differed among juveniles and adults. Recovery to ambient levels in P-M systems took about 3 weeks, although their physical characteristics only lasted about 2 weeks. Correlations among ambient densities and adjacent P-M systems were mixed, but suggested decoupling between local ambient and P-M dynamics for some taxa either in relation to age of the patch and/or size of the individuals. At the community level, local differences appeared to be a significant source of variation in new pits, but differences were swamped out when recruitment was high. Differences were more evident in older P-M systems. These results show that sources of local variation in infaunal dynamics can be attributed to a combination of small-scale disturbance/recovery processes and spatially and temporally changing ambient conditions. Identifying extant spatial and temporal small-scale variation can be a critical component of understanding and interpreting larger-scale dynamics of son-sediment systems.
机译：通过进食活动产生的生物结构对软沉积物群落产生不同的影响，改变种群动态，形成连续斑块的时间镶嵌，并最终增加不同空间尺度上的变化。这项研究的重点是评估潮间带滩涂（River Plym，英国）中种群对矿坑（P）和土墩（M）的反应，以确定（a）这些结构（最大尺寸1400 cm〜2）及其形成方式， （b）周围社区的局部变化可能在多大程度上影响了不育的反应。在研究期内，大多数优势动物的0和1周龄坑的密度显着低于周围和土丘区域。一些物种的土墩丰度更高，在幼鱼和成年鱼中，对这两种结构的反应都不同。尽管P-M系统的物理特性仅持续约2周，但恢复到环境水平大约需要3周。环境密度与相邻P-M系统之间的相关关系混合在一起，但建议某些分类群的局部环境和P-M动态之间的解耦，要么与斑块的年龄和/或个体的大小有关。在社区一级，当地差异似乎是新坑变化的重要原因，但是，在高招募时，差异被淹没了。在较旧的P-M系统中，差异更加明显。这些结果表明，不良动力学中局部变化的根源可归因于小规模干扰/恢复过程以及时空变化的环境条件的结合。识别现存的空间和时间小尺度变化可能是理解和解释子沉降系统更大尺度动力学的关键组成部分。

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