Eidens Corvin, Bayraktarov Elisa, Hauffe Torsten, Pizarro Valeria, Wilke Thomas, Wild Christian
Department of Animal Ecology & Systematics, Justus Liebig University Giessen , Germany ; Coral Reef Ecology Group (CORE), Leibniz Center for Tropical Marine Ecology , Bremen , Germany.
Coral Reef Ecology Group (CORE), Leibniz Center for Tropical Marine Ecology , Bremen , Germany.
PeerJ. 2014 Sep 2;2:e554. doi: 10.7717/peerj.554. eCollection 2014.
In Tayrona National Natural Park (Colombian Caribbean), abiotic factors such as light intensity, water temperature, and nutrient availability are subjected to high temporal variability due to seasonal coastal upwelling. These factors are the major drivers controlling coral reef primary production as one of the key ecosystem services. This offers the opportunity to assess the effects of abiotic factors on reef productivity. We therefore quantified primary net (Pn ) and gross production (Pg ) of the dominant local primary producers (scleractinian corals, macroalgae, algal turfs, crustose coralline algae, and microphytobenthos) at a water current/wave-exposed and-sheltered site in an exemplary bay of Tayrona National Natural Park. A series of short-term incubations was conducted to quantify O2 fluxes of the different primary producers during non-upwelling and the upwelling event 2011/2012, and generalized linear models were used to analyze group-specific O2 production, their contribution to benthic O2 fluxes, and total daily benthic O2 production. At the organism level, scleractinian corals showed highest Pn and Pg rates during non-upwelling (16 and 19 mmol O2 m(-2) specimen area h(-1)), and corals and algal turfs dominated the primary production during upwelling (12 and 19 mmol O2 m(-2) specimen area h(-1), respectively). At the ecosystem level, corals contributed most to total Pn and Pg during non-upwelling, while during upwelling, corals contributed most to Pn and Pg only at the exposed site and macroalgae at the sheltered site, respectively. Despite the significant spatial and temporal differences in individual productivity of the investigated groups and their different contribution to reef productivity, differences for daily ecosystem productivity were only present for Pg at exposed with higher O2 fluxes during non-upwelling compared to upwelling. Our findings therefore indicate that total benthic primary productivity of local autotrophic reef communities is relatively stable despite the pronounced fluctuations of environmental key parameters. This may result in higher resilience against anthropogenic disturbances and climate change and Tayrona National Natural Park should therefore be considered as a conservation priority area.
在泰罗纳国家自然公园（哥伦比亚加勒比地区），由于季节性沿岸上升流，光照强度、水温及养分可利用性等非生物因素呈现出高度的时间变异性。这些因素作为关键的生态系统服务之一，是控制珊瑚礁初级生产的主要驱动因素。这为评估非生物因素对珊瑚礁生产力的影响提供了契机。因此，我们在泰罗纳国家自然公园一个典型海湾的水流/波浪暴露和遮蔽位点，对当地主要初级生产者（石珊瑚、大型藻类、藻席、壳状珊瑚藻和微型底栖植物）的初级净产量（Pn）和总初级生产力（Pg）进行了量化。进行了一系列短期培养实验，以量化不同初级生产者在非上升流期间及2011/2012年上升流事件期间的氧气通量，并采用广义线性模型分析特定群体的氧气产量、它们对底栖氧气通量的贡献以及每日底栖总氧气产量。在生物体层面，石珊瑚在非上升流期间显示出最高的Pn和Pg速率（分别为16和19 mmol O2 m(-2)样本面积 h(-1)），而在上升流期间，珊瑚和藻席分别主导了初级生产（分别为12和19 mmol O2 m(-2)样本面积 h(-1)）。在生态系统层面，在非上升流期间，珊瑚对总Pn和Pg的贡献最大，而在上升流期间，珊瑚仅在暴露位点对Pn贡献最大，在遮蔽位点大型藻类对Pg贡献最大。尽管所研究群体的个体生产力存在显著的时空差异，且它们对珊瑚礁生产力的贡献不同，但每日生态系统生产力的差异仅体现在非上升流期间暴露位点的Pg上，其氧气通量高于上升流期间。因此，我们的研究结果表明，尽管环境关键参数波动明显，但当地自养珊瑚礁群落的底栖总初级生产力相对稳定。这可能导致对人为干扰和气候变化具有更高的恢复力，因此泰罗纳国家自然公园应被视为一个保护优先区域。
