Modeling seagrass bed dynamics under environmental impacts of intensive mariculture activities in Bolinao and Anda, the Philippines
Modeling seagrass bed dynamics under environmental impacts of intensive mariculture activities in Bolinao and Anda, the Philippines
复制标题
对菲律宾博利瑙和安达集约化海水养殖活动环境影响下的海草床动态进行建模
DOI：
10.1016/j.ecss.2020.107152
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Nadaoka Kazuo
中科院分区：
文献类型：
--
作者：
Yoshikai Masaya;Nakamura Takashi;Tanaka Yoshiyuki;Nakaoka Masahiro;Watanabe Atsushi;Herrera Eugene C.;Tsuchiya Takumi;Miyajima Toshihiro;San Diego-McGlone Maria Lourdes;Fortes Miguel D.;Blanco Ariel C.;Tamondong Ayin M.;Nadaoka Kazuo
本研究评估了菲律宾Bolinao和Anda沿海地区混合海草床的河口尺度动态，其中海草床的减少主要是由于邻近地区不受管制的海水养殖活动引起的富营养化引起的光环境退化。基于水动力-生物地球化学耦合模型，建立了海草模型，并将其应用于该地区两种优势海草——海带海草（thalassia hemprichiiiand enhalus acoroides），并利用观测到的海草空间芽密度进行了验证。结果表明，由于来自养鱼场的高浮游植物生物量和高营养物质的水的平流通量，导致海草床的光环境退化，特别是在海水养殖区附近。再生水质驱动的海草模型对两种共存物种的地上生物量分布具有较高的再现性，r2值分别为0.78和0.60 forT。hemprichiiandE。分别acoroides。通过情景分析，研究了个体和城市间的海水养殖管理（如调节鱼饲料投入）在改善光环境和促进海草恢复方面的有效性。结果表明，由于Bolinao市和Anda市的水域通过水动力学相互连接，因此与Bolinao市和Anda市的单独努力相比，市间方案可以显著改善光环境。结合光照条件的改善，合作管理方案下海草丰度的恢复最为显著，从而突出了合作管理方案的有效性。
This study assessed the estuarine-scale dynamics of mixed seagrass beds in Bolinao and Anda coastal areas in the Philippines, where seagrass beds have declined primarily due to eutrophication-induced degradation of light environment caused by unregulated mariculture activities in the adjacent areas. A seagrass model, driven by a coupled hydrodynamic-biogeochemical model, was developed and applied to the two-dominant species in the area –Thalassia hemprichiiandEnhalus acoroides, and validated using observed spatial seagrass shoot density. The results showed the degradation of light environment in the seagrass beds, especially near mariculture areas, due to advective fluxes of water with high phytoplankton biomass and high nutrients from fish farms. The seagrass model driven by the reproduced water quality showed high reproducibility of seagrass above-ground biomass distribution of the two co-existing species, with R2values of 0.78 and 0.60 forT. hemprichiiandE. acoroides, respectively. Scenario analysis was conducted to examine the effectiveness of individual- and inter-municipality mariculture management (e.g., regulating fish feed input) in improving the light environment and facilitating the recovery of seagrasses. Results showed that the light environment could be significantly enhanced by an inter-municipality scheme compared to individual efforts of Bolinao and Anda municipalities, since their waters are interconnected through hydrodynamics. In conjunction with the improvement of light conditions, the recovery in seagrass abundance is most significant under the cooperative management scheme, thus highlighting its effectiveness.
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