Abstract
The study aims to analyze diurnal migration of zooplankton in Ambon Bay. Data sampling method which is conducted stationary utilizes pontoon mooring as floating platform for acoustic data sampling. Based on the analysis, diurnal migration of zooplankton occurs at noon, zooplankton swims in water surface to epipelagic zone (0-20 m) with value of scattering volume value -90.13 dB to -100.30 dB; it indicates sparse and scattered aggregation (N=128). At night, scattering volume of -90.01 dB to -100.30 dB indicates dense and concentrated aggregation (N=75). Scattering volume is numerical expression of zooplankton density. Chlorophyll a concentration in depth of 0-10 meter having the highest value of 5.16 ppb highly affects the existence of zooplankton. It functions for food availability of pelagic fish as its carnivore.
Highlights
Role of zooplankton in waters is crucial since it is one of elements in oceanic food chain
Diurnal migration of zooplankton occurs at noon, zooplankton swims in water surface to epipelagic zone (0-20 m) with value of scattering volume value -90.13 dB to -100.30 dB; it indicates sparse and scattered aggregation (N=128)
Based on the table above, distribution of scattering volume value will change over time and depth, value of scattering volume increases at 21:00-00:00 because it is affected by the nature of zooplankton which will increase and decrease along with waters column
Summary
Role of zooplankton in waters is crucial since it is one of elements in oceanic food chain. Scientists have discussed about challenge to utilize underwater noise measurement for marine organism research, for fishes and zooplankton (Beamish, 1971; Holiday and Pieper, 1980; Stanton et al, 1998). Known as diurnal vertical migration, of marine organisms is familiar phenomenon which is widely documented in literature (Everson, 1982). Inner Ambon Bay is dynamic area connected to Banda Sea where the water exchange goes across Outer Ambon Bay. During upwelling in Banda Sea, thermocline is lower than the period when the upwelling does not occur; the phenomenon streams cold current from outer bay to inner bay. Factors like tidal currents and seasonal upwelling in Ambon Bay affect nutrient concentration, temperature, salinity, and zooplankton community structure (Wagey, 2002)
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