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- Title
Phytoplankton community structure shaped by key environmental factors in fish and shellfish farms in Daya Bay, South China.
- Authors
Zhang, Xia; Huang, Xiaoping; Huang, Liangmin
- Abstract
In coastal cultural regions of Dapeng Cove (southwest of Daya Bay), the composition, abundance and community Structure of phytoplankton, as well as physicochemical variables, were investigated to identifactors driving seasonal changes. During summer, local phytoplankion biomass was/ow, probably because of nutrient depletion. In September, sudden heavy rainfalls resulted in a substantial increase in nitrogen. As a result, a disturbance-tolerant diatom, Skeletonema costatum, increased rapidly. Organic matter associated with freshwater runofffishery activities and settled a/gal cells increased consumption of dissolved oxygen (DO), especially infishfarms. It was suggested that heavy rainfall events was probably a trigger oflow oxygen level and exerted a major effect on nutrient cycling and the phytoplanklon community. In winter, phytoplankton community was characterized by dinofiagellates, which are adapted to well-mixed conditions. Spring blooms composed of Pseudonitzschia delicatissima and P. pungens were triggered by warm temperature and increasing light intensity. Excessive ammonium levels in March probably contributed to bloom initiation. Dissolved inorganic nitrogen (DIN) and total phosphorus (TP) concentrations in fish farms were sign jficantly higher than that in bivalve cultures and control sites although phytoplankton abundance in fish farms was not. We suggest that intense fish culture farming exerts more pressure on the ambient environment than shellfish farming.
- Subjects
DAYA Bay (China); PHYTOPLANKTON populations; FISH farming; SHELLFISH culture; DIATOMS; SKELETONEMA costatum
- Publication
Aquatic Ecosystem Health & Management, 2013, Vol 16, Issue 3, p300
- ISSN
1463-4988
- Publication type
Article
- DOI
10.1080/14634988.2013.817935