Kemelimpahan anggang-anggang Ptilomera dromas Breddin (Hemiptera: Gerridae) di Sungai Ciliwung dalam kaitannya dengan kualitas air

Abstract

Anggang-anggang Ptilomera dromas Breddin (Gerridae: Hemiptera) adalah serangga akuatik yang ditemukan di berbagai perairan, seperti sungai, kolam, dan danau. Penelitian ini mengkaji kemelimpahan P. dromas di Sungai Ciliwung dalam kaitannya dengan kualitas air. Kemelimpahan P. dromas disurvei di lima stasiun pengamatan, yaitu stasiun Cilember, Cijulang, Gadog, Katulampa, dan Sempur. Parameter lingkungan yang diukur di setiap stasiun adalah suhu air, suhu udara, pH, arus air, biological oxygen demand (BOD), dissolved oxygen (DO), CO2 bebas, total N, kesadahan air, dan total suspended solid (TSS). Hubungan antara kemelimpahan P. dromas dan parameter lingkungan dianalisis dengan general linier model (GLM). Hasil penelitian menunjukkan bahwa kemelimpahan P. dromas tertinggi terdapat di stasiun Gadog, diikuti oleh Cilember, Katulampa, dan Cijulang. Anggang-anggang P. dromas tidak ditemukan di stasiun Sempur diduga karena adanya penghalang berupa bendung Katulampa dan nilai TSS dan BOD yang tinggi. Berdasarkan analisis GLM, pH dan kesadahan air berpengaruh positif terhadap kemelimpahan P. dromas. Keberadaan P. dromas di stasiun penelitian bagian hulu sungai diduga berkaitan dengan kualitas perairan yang masih baik dan tingkat polusi yang relatif rendah.Water-strider Ptilomera dromas Breddin (Gerridae: Hemiptera) is an aquatic insect that is commonly found in various waters, such as rivers, ponds, and lakes. The purpose of this research was to study the abundance of P. dromas in Ciliwung river in relation to its water quality. The abundance of P. dromas was surveyed at five stations, i.e. Cilember, Cijulang, Gadog, Katulampa, and Sempur stations. Environmental parameters measured were water temperature, air temperature, pH, water flow, biological oxygen demand (BOD), dissolved oxygen (DO), free CO2 level, nitrogen total, water hardness, and total suspended solid (TSS). The relationship of P. dromas abundance with environment parameters was analyzed by using general linear model (GLM). Results showed that the highest abundance of P. dromas was found in Gadog station, followed by Cilember, Katulampa, and Cijulang stations. The population of P. dromas was not found in Sempur station, which might be related to the presence of Katulampa weir that acts as physical barrier and due to high BOD and TSS values. Based on GLM analysis, water hardness and pH were correlated positively with abundance of P. dromas. The existence of P. dromas in the upstream stations is linked to the high water quality and low pollution of waters.