Response of macrobenthic communities to the Toarcian Oceanic Anoxic Event in northeastern Panthalassa (Ya Ha Tinda, Alberta, Canada)
Response of macrobenthic communities to the Toarcian Oceanic Anoxic Event in northeastern Panthalassa (Ya Ha Tinda, Alberta, Canada)
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Panthalassa 东北部大型底栖动物群落对 Toarcian 海洋缺氧事件的响应（加拿大艾伯塔省亚哈廷达）
DOI：
10.1016/j.palaeo.2017.01.009
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Aberhan, Martin
中科院分区：
文献类型：
--
作者：
Martindale, Rowan C.;Aberhan, Martin
在早侏罗世，晚Pliensbachian到早Toarcian间隔表现出显着的环境扰动和生物灭绝。本研究记录了在此期间，在一个区域，以前收到的研究相对较少的大型底栖动物群落：东北泛地中海。加拿大阿尔伯塔雅哈廷达湖（费尔尼组）底栖动物群落的残遗化石主要由双壳类和腕足类组成，与欧洲同时代的黑色页岩动物群在分类学和生态学上具有相似性。前T-OAE社区是由大型epifaunal悬浮饲养（双壳类和腕足类），龙虾，海百合，和穴居生物的痕迹化石表示。的同位素漂移的发病正好与批发营业额的双壳类和腕足类属，以及与显着减少，作为一个整体的社会成员的身体大小。内的T-OAE社区主要由机会主义，耐低氧的底栖生物类群，定期沿着一些facultium pseudoacetontic类群殖民海底。与当代存款在欧洲，有没有恢复的迹象，在亚哈廷达在中东Toarcian Planulata菊石区;丰度，丰富度和功能多样性的底栖生物类群仍然非常低，社区成员的规模仍然很小。对这个系统的主要压力被解释为氧气限制。在Pliensbachian-Toarcian阶段边界的底栖生物群落的最小生态影响和延迟恢复的T-OAE的底栖生物是在显着的对比，从东北泛地中海的远洋记录。这表明在早侏罗世在这一地区的底栖和远洋社区脱钩。
In the Early Jurassic, the late Pliensbachian through early Toarcian interval exhibits significant environmental perturbations and biotic extinctions. This study documents the macrobenthic community during this interval in a region that has previously received comparatively little study: northeastern Panthalassa. The relicts of benthic communities from the Ya Ha Tinda Lagerstätte (Fernie Formation) in Alberta, Canada are primarily composed of bivalves and brachiopods, and exhibit taxonomic and ecological similarities with coeval black shale faunas from Europe.At Ya Ha Tinda, the initiation of the carbon isotope excursion that occurred during the Toarcian Oceanic Anoxic Event (T-OAE) is coincident with major faunal change. The pre-T-OAE community is composed of large epifaunal suspension-feeders (bivalves and brachiopods), lobsters, crinoids, and burrowing organisms represented as trace fossils. The onset of the isotope excursion coincided with a wholesale turnover of bivalve and brachiopod genera as well as with a significant diminution in body size of the community members as a whole. The intra-T-OAE community largely consisted of opportunistic, low-oxygen-tolerant benthic taxa that colonized the seafloor periodically along with some facultatively pseudoplanktonic taxa. Unlike the contemporary deposits in Europe, there is no sign of recovery at Ya Ha Tinda in the middle Toarcian Planulata Ammonite Zone; abundance, richness, and functional diversity of benthic taxa remained extremely low and the size of community members remained small. The primary stress on this system is interpreted to have been oxygen limitation. The minimal ecological effect on the benthic community at the Pliensbachian-Toarcian stage boundary and delayed recovery from the T-OAE of the benthos are in marked contrast to the pelagic record from northeastern Panthalassa. This suggests a decoupling of the benthic and pelagic communities in this region during the Early Jurassic.
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