Diurnal Migration of Zooplankton in Inner Ambon Bay, Indonesia

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.

Control Pest of Leaf Caterpillars (Plutella xylostella) in Delima Rose Apples Using Soursop Leaf Extract (Annona muricata)

“…The application of extracts to inhibit the growth of pests has also been done in previous research such as garlic plant extracts to cope with snail pests (Rusdy, 2010); papaya leaf extract to inhibit plant pests (Setyawati & Julaily., 2013), inhibit larvae of Plutella xylostella (Siahaya & Rumthe, 2014;Yuliani & Kuswanti, 2013); ethanol extract of melinjo leaves (Moniharapon & Moniharapon, 2014); dan jengkol rind extract (Ambarningrum et al, 2011).…”