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A trophic model of a sandy barrier lagoon at Chiku in southwestern Taiwan
Lin, H.-J.; Shao, K.-T.; Kuo, S.-R.; Hsieh, H.-L.; Wong, S.-L.; Chen, I.-M.; Lo, W.-T.; Hung, J.-J. (1999). A trophic model of a sandy barrier lagoon at Chiku in southwestern Taiwan. Est., Coast. and Shelf Sci. 48(5): 575-588
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer
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| Auteurs | | Top |
- Lin, H.-J.
- Shao, K.-T.
- Kuo, S.-R.
- Hsieh, H.-L.
|
- Wong, S.-L.
- Chen, I.-M.
- Lo, W.-T.
- Hung, J.-J.
|
|
| Abstract |
Using the ECOPATH 3.0 software system, a balanced trophic model of a sandybarrier lagoon with intensive fishery activities at Chiku in tropical Taiwan wasconstructed. The lagoon model comprised 13 compartments. Trophic levels of thecompartments varied from 1.0 for primary producers and detritus to 3.6 forpiscivorous fish. Hanging-cultured oysters accounted for 39% of the harvestablefishery biomass and were the most important fishery species. The most prominentgroup in terms of biomass and energy flow in the lagoon was herbivorouszooplankton. Manipulations of the biomass of herbivorous zooplankton wouldhave a marked impact on most compartments. Both total system throughput andfishery yield per unit area were high when compared to other reported marineecosystems. This appears mainly due to high planktonic primary production, whichis probably promoted by enriched river discharges draining mangroves andaquaculture ponds. Consequently, more than half of the total system throughputoriginates from primary producers in the lagoon. Although half of the primaryproduction was not immediately used by upper trophic levels and flowed into thedetrital pool, most of the detritus was directly consumed, passed up the food weband was exported to the fishery. Thus only a small proportion of energy wasrecycled through detritus pathways. This mechanism produces short pathways withhigh trophic efficiencies at higher trophic levels. The high fishery yield in the lagoonis due to high primary production and short pathways. This is the first model of atropical sandy barrier lagoon with intensive fishery activities and thus may serve asa basis for future comparisons and ecosystem management. |
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