Modeling the timing of spring phytoplankton bloom and biological production of the Gulf of St. Lawrence (Canada): Effects of colored dissolved organic matter and temperature     

Zhi-Ping Mei  François J. Saucier  Vincent Le Fouest  Bruno Zakardjian  Simon Sennville  Huixiang Xie  Michel Starr 《Continental Shelf Research》2010

The effects of colored dissolved organic matter (CDOM) from freshwater runoff and seasonal cycle of temperature on the dynamic of phytoplankton and zooplankton biomass and production in the Gulf of St. Lawrence (GSL) are studied using a 3-D coupled physical-plankton ecosystem model. Three simulations are conducted: (1) the reference simulation based on Le Fouest et al. (2005), in which light attenuation by CDOM is not considered and maximum growth rate (_μmax${\mu }_{\max }$) of phytoplankton and zooplankton are not temperature-dependent (REF simulation); (2) light attenuation by CDOM is added to REF simulation (CDOM simulation); and (3) in addition to CDOM, the _μmax${\mu }_{\max }$ of phytoplankton and zooplankton are regulated by temperature (CDOM+TEMP simulation). CDOM simulation shows that CDOM substantially reduces phytoplankton biomass and production in the Lower St. Lawrence Estuary (LSLE), but slightly reduces overall primary production in the GSL. In the LSLE, the spring phytoplankton bloom is delayed from mid-March to mid-April, resulted from light attenuation by CDOM. The CDOM+TEMP simulation shows that the spring phytoplankton bloom in the LSLE is further delayed to July, which is more consistent with observations. Annual primary production is reduced by 33% in CDOM+TEMP simulation from REF and CDOM simulations. Zooplankton production is the same in all three simulations, and export of organic matter to depth is reduced in CDOM+TEMP simulation, suggesting that temperature controlled growth of phytoplankton and zooplankton enhances the coupling between primary production and zooplankton production under the seasonal temperature cycle of the GSL.  相似文献   

The management challenge posed by marine dispersal of terrestrial plants in coastal dune systems     

Teresa M. Konlechner 《New Zealand geographer》2008,64(2):154-156

Abstract:    Marine dispersal provides a mechanism for introduced plants to invade coastal systems. Regular surveillance is essential for management of marine dispersed weeds. This paper outlines the biological, physical and management dimensions of this coastal issue in New Zealand.  相似文献   

Maritime trade, biological invasions, and the properties of alternate inspection regimes     

Amitrajeet A. Batabyal  Hamid Beladi  Won W. Koo 《Stochastic Environmental Research and Risk Assessment (SERRA)》2005,19(3):184-190

We analyze the problem of preventing biological invasions caused by ships transporting internationally traded goods between countries and continents. Specifically, we ask the following question: should a port manager have a small number of inspectors inspect arriving ships less stringently or should this manager have a large number of inspectors inspect the same ships more stringently? We use a simple queuing-theoretic framework and show that if decreasing the economic cost of regulation is very important then it makes more sense for the port manager to choose the less stringent inspection regime. In contrast, if reducing the damage from biological invasions is more salient then the port manager ought to pick the more stringent inspection regime.  相似文献   

Assessing the performance of the Aichi Biodiversity Targets in Brazil: a test using two regional-scale indices related to coastal and marine ecosystem conservation     

《Marine Policy》2016

One of the main challenges of international environmental agreements is improving relevant policy actions to promote adequate environmental responses. To support the work of decision makers, recent studies have used environmental and social indicators to construct global and regional-scale indices. This study aimed to use the Ocean Health Index and the Management Ranking for Brazilian States to assess Brazil’s performance regarding the Aichi Biodiversity Targets (ABTs) for coastal and marine ecosystems. Thus, six ABTs were matched and their performance was evaluated. These ABTs focused on the following topics: pollution, fish and invertebrate stocks, pressures on coral, threatened species and their conservation, the contribution of biodiversity to carbon stocks and the national biodiversity strategy and action plan. However, although the indices used showed many pathways to explore how Brazil is performing, it is still complex to evaluate ABTs’ performance regarding coastal and marine ecosystems at a global and regional scale.  相似文献   

废弃砖瓦窑厂土地复垦及其生态学原理     

储卫东 《国土资源情报》2014,(4):47-50

废弃砖瓦窑厂土地复垦技术包括工程复垦和生物复垦,在具体实施复垦方案时,要遵循生态学原理。工程复垦阶段,除了使被破坏土地恢复到可供利用的物理状态,还要考虑改善生态环境和生物多样性;生物复垦阶段,要按照生物与环境协同进化原理、生态结构稳定性与功能协调性等原理,采用施肥法、绿肥法、微生物法、管理法恢复土壤肥力与生物生产能力。淮安市淮安区范集镇大花村在废弃砖瓦窑厂土地复垦项目中,依据生态学理论,因地制宜,采取适宜的方案进行土地复垦,实现了生态环境的良性循环及土地资源的可持续利用。  相似文献   

无瓣海桑造林是否造成九龙江口生物入侵的探讨   总被引：8，自引：0，他引：8  

潘辉  薛志勇  陈国荣 《湿地科学与管理》2006,2(2):51-55

尽快恢复和发展红树林、营造防潮抗灾能力强、生产力高的红树护岸林体系,改造沿海滩涂生态环境,是沿海防护林体系建设的主要任务。无瓣海桑是从孟加拉国引进的速生红树树种,生长快,生产力高,在较短时间内能起到保护海堤和稳定海滩的作用,但无瓣海桑毕竟是外来种,是否造成生物入侵并给滨海滩涂带来生态灾害众说纷纭。本文从入侵种的生态影响入手进行分析,认为无瓣海桑造林目前尚未造成九龙江口生物入侵。  相似文献