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Macrofaunal diversity and community structure of the DeSoto Canyon and adjacent slope
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2021-04-15 , DOI: 10.3354/meps13646
Arvind K. Shantharam, Chih-Lin Wei, Mauricio Silva, Amy R. Baco

ABSTRACT: Northern Gulf of Mexico canyons are centers of organic matter accumulation and biodiversity, but studies of their finer-scale (sub-100 km) ecological patterns are scarce. Detailed sampling of macrofauna within the DeSoto Canyon was undertaken along 3 depth transects on the canyon wall, axis, and adjacent slope. Sediment, terrain, and water mass parameters were also compiled for the same stations. Within the canyon, macrofaunal abundance decreased, evenness increased, and richness followed the expected parabolic curve with depth, peaking at 1100 m. Cluster analysis identified 3 canyon depth groups that conformed to established bathymetric boundaries for the non-canyon Gulf of Mexico slope: Group I at <500 m, Group II at 669-1834 m, and Group III at >2000 m. Explanatory environmental models indicate that canyon community structure was strongly correlated with oxygen concentration and fluorescence, with a weaker potential influence from any of salinity, particulate organic carbon, sediment organic carbon, or slope. Comparisons of the habitats indicated that abundances were highest on the canyon wall. Slope community structure differed from that of either of the canyon habitats. Environmental models consisted of single variables including oxygen concentration, sediment organic carbon, slope, and temperature with similar explanatory values. Community differences within the canyon and between the canyon and adjoining slope contradict previous findings of a single faunal zone for the whole study area. Factors that may contribute to inter-habitat heterogeneity include potential hydrocarbon seepage, organically enriched sediment deposits along channels, or remnant influence from the Deepwater Horizon spill, warranting more research into this dynamic ecosystem.

中文翻译:

DeSoto峡谷及邻近斜坡的大型动物多样性和群落结构

摘要:墨西哥湾北部峡谷是有机质积累和生物多样性的中心,但对其更小规模(100公里以下)生态模式的研究却很少。DeSoto峡谷内大型动物的详细采样是沿着峡谷壁,轴心和相邻边坡上的3个深度样点进行的。还为同一站点编辑了沉积物,地形和水质参数。在峡谷内,大型动物的丰度降低,均匀度增加,并且丰富度遵循预期的抛物线随深度变化,在1100 m达到峰值。聚类分析确定了三个峡谷深度组,它们符合非峡谷墨西哥湾斜坡的已建立的测深边界:第一类为<500 m,第二类为669-1834 m,第三类为> 2000 m。解释性环境模型表明,峡谷群落结构与氧气浓度和荧光密切相关,而盐度,颗粒有机碳,沉积物有机碳或坡度中的任何一个对潜势的影响均较弱。对生境的比较表明,峡谷壁上的丰度最高。斜坡群落结构不同于任何一个峡谷生境。环境模型由单个变量组成,包括氧气浓度,沉积物有机碳,斜率和温度,并具有相似的解释值。峡谷内以及峡谷与相邻斜坡之间的群落差异与整个研究区域内单个动物区带的先前发现相矛盾。可能导致栖息地异质性的因素包括潜在的碳氢化合物渗漏,
更新日期:2021-04-15
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