杰出演讲zonneveld会谈“在阴暗的水设置的珊瑚礁”

  • 二○一九年十月一十九日

EES欢迎杰出演讲博士。约翰 - 保罗zonneveld,加拿大阿尔伯塔大学。

“珊瑚礁在阴暗的水设置:多样化和健壮的珊瑚礁继承在浑水设置在珊瑚三角的南部边缘”

2019年10月25日下午12:30房间204,自然科学建设

珊瑚礁是在近现代海洋设置最多样化的生态系统却是在环境参数,如海水温度,浊度,海洋的pH值,海平面波动和风暴强度和频率的变化而变化格外敏感。这些压力的,热应力可能最严重的有害作用(例如,在大堡礁的珊瑚高达30%,NE澳大利亚2015-2016漂白事件中被杀害)。大多数珊瑚礁的研究集中在典型的清水珊瑚礁系统但是珊瑚礁是在一些浑水设置(例如,三角洲前缘,河口,海岸macrotidal),以及常见的。虽然浊度一直被看作应力对珊瑚源,最近的分析人认为浊度中等水平可以通过从特别高太阳通量屏蔽珊瑚类群降低礁应力。

The northeastern coast of Sumba, East Nusa Tengarra, Indonesia, between Tanjung Laundi and Tanjung Watuata occurs within the heart of the coral triangle and provides a natural laboratory within which to test the importance of turbid environments for corals and coral reefs. This coast consists of a ~475 metre thick succession of uplifted coral reef terraces. Previous studies have shown that these terraces were uplifted over the past ~1,000,000 years and provides an approximately continuous record of reef development in northeastern Sumba during the late Pleistocene and Holocene. To date, this study has focussed on reefs within the Waingapu Bay –Kambinaru River Valley area. The Kambinaru River system incises through the Laundi-Watuata terrace system. It has been active since at least the early Pleistocene and delivers siliclastics sand, silt and clay sourced in from sedimentary and volcanic strata in the Matawai La Pawu highlands in the southern part of the island. The Kambinaru mouth debouches into Waingapu Bay on the Savu Sea where it forms a seasonally deltaic complex that is flow-dominated for a short portion of each year and wave-dominated for the rest. Despite considerable turbidity, moderate-sized coral reefs occur within, and adjacent to, the modern delta complex. Analysis of Pleistocene outcrop in the Kambinaru Valley area show that reefs occurred interstratified with fluvial-deltaic-dominated areas throughout the Pleistocene. Coral reef successions within the Kambinaru embayment include 10-45% siliciclastic silt, sand and gravel. Reef limestone units sampled from open-ocean (clear water) palaeo-settings at Tanjung Laundi typically consist of <5% clastic detritus. Reef systems on open coastal settings are generally diverse (referred to here as equilibrium reefs) however several low-diversity reef systems characterized by comparatively few coral taxa and common coralline algae also occur in clear water settings and are interpreted as local coral extirpation events (referred to here as crisis reef). Coeval turbid-water reefs, although less diverse than equilibrium reefs in clear water settings, maintain diversity during crisis intervals.  Preliminary evidence suggests that Pleistocene turbid-system coral reefs in Sumba acted as refugia wherein corals and associated biota survived ecological crises that decimated temporally equivalent open ocean / clear water reefs.

约翰 - 保罗zonneveld在阿尔伯塔省,阿尔伯塔岩芯收集和SEPM特刊主编的大学馆长大学地球和大气科学系教授。约翰 - 保罗已经与阿尔伯塔大学12年。在此之前,约翰 - 保罗是一位研究地质学家与加拿大地质调查。约翰 - 保罗毕业了学士从卡尔文学院(1988),硕士从365bet体育(1994),博士从阿尔伯塔(1999年)的大学。

约翰 - 保罗的研究主要集中在沉积学,地层学,古生态学和古生物学等领域。约翰 - 保罗的研究项目通常是多学科的,一般集中在涉及地质和生物系统之间的接口问题。当前项目包括:混合硅质碎屑碳酸盐沉积体系;在三叠纪熄灭后海洋系统生物复苏;沉积学,生物地层和早在怀俄明州西南部始新世继承古生态学;和第三系到季古生物学和岛东南亚(侧重于苏门答腊,加里曼丹松巴,巴厘岛和帝)的沉积。

 

 

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