Extrinsic control of species replacement on a Holocene reef in Belize: the role of coral disease
Extrinsic control of species replacement on a Holocene reef in Belize: the role of coral disease
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DOI：
10.1007/s003380050122
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发表时间：
1998-09-01
期刊：
影响因子：
3.5
通讯作者：
Macintyre, IG
中科院分区：
文献类型：
--
作者：
Aronson, RB;Precht, WF;Macintyre, IG
保存完好的全新世珊瑚礁提供了区分内在驱动的演替模式和外在驱动的物种更替模式的机会，特别是当古生物学模式可以与潜在机制的生态观察相结合时。在伯利兹大堡礁的中央大陆架泻湖的菱形浅滩经历了最近和戏剧性的变化，在社会组成。Agaricia tenuifolia取代Acropora cervicornis成为沿着礁侧翼3-15 m深度的优势珊瑚物种。我们检验了这样一个假设，即向上变浅导致了这种优势的转变。从0.5米水深的浅滩之一，通道盖伊提取的核心，揭示了一个浅向上转移的优势，从鹿角珊瑚到滨珊瑚divaricata。这一演替序列与在6-11 m水深的4个岩心中观察到的顶孔菌-伞菌属过渡序列完全不同。生态观察表明，Agaricin成为主导大于或等于3米的深度后，鹿角珊瑚种群被摧毁的一个区域爆发的白带病。Acropora到Agaricia的过渡显然是一个外部驱动的物种更替的案例，而不是一个内在驱动的，连续的，浅向上的序列。
Well-preserved, Holocene coral reefs provide the opportunity to discriminate between models of intrinsically driven succession and extrinsically driven species replacement, especially when paleontological patterns can be combined with ecological observations of the underlying mechanisms. Rhomboid shoals in the central shelf lagoon of the Belizean Barrier Reef experienced a recent and dramatic change in community composition. Agaricia tenuifolia replaced Acropora cervicornis as the dominant coral species at 3-15 m depth along the flanks of the reefs. We tested the hypothesis that shallowing upward caused this shift in dominance. A core extracted from 0.5 m water depth on one of the shoals, Channel Gay, revealed a shallowing-upward shift in dominance from Acropora to Porites divaricata. This successional sequence was quite different from the Acropora-to-Agaricia transition observed in four cores from 6-11 m water depth. Ecological observations showed that Agaricin became the dominant at greater than or equal to 3 m depth after Acropora populations were decimated by a regional outbreak of white-band disease. The Acropora-to-Agaricia transition was clearly a case of extrinsically driven species replacement rather than an intrinsically driven, successional, shallowing-upward sequence.