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All Journal LIMNOTEK - Perairan Darat Tropis di Indonesia LIMNOTEK
Tanjung, Livia Rossila
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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KERAPATAN POPULASI MAKROFITA BERPENGARUH TERHADAP KELIMPAHAN DAN KEANEKARAGAMAN MIKROALGA EPIFITON DI DANAU TEMPE Nofdianto, Nofdi; Tanjung, Livia Rossila
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 26, No 2 (2019)
Publisher : Research Center for Limnology

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Abstract

Danau paparan banjir seperti Danau Tempe memiliki potensi perikanan air tawar cukup besar karena didukung oleh keunikan dalam hal produktivitasnya. Selain berfungsi sebagai komponen utama dalam produktivitas danau dan sebagai feeding ground bagi berbagai spesies ikan, tanaman air atau makrofita yang tumbuh subur di pinggir danau juga merupakan substrat bagi mikroalga epifiton yang berperan penting dalam produktivitas sekunder danau. Penelitian ini bertujuan untuk menegaskan bahwa pengendalian kerapatan tumbuh makrofita sebagai substrat mikroalga epifiton penting dilakukan dalam mendukung produktivitas perikanan berbasis ekosistem. Penelitian ini dilakukan di Danau Tempe pada bulan Maret, Mei, dan Juli 2017 terhadap kerapatan makrofita yang berbeda berdasarkan penerimaan cahaya. Sampel berupa batang makrofita dengan panjang 10 cm yang terendam dalam air diambil secara komposit sebanyak 5 batang, lalu disikat untuk mendapatkan mikroalga epifiton. Identifikasi epifiton dilakukan di Laboratorium Pusat Penelitian Limnologi LIPI. Hasilnya menunjukkan bahwa kerapatan tumbuh makrofita berpengaruh negatif terhadap kelimpahan dan keanekaragaman mikroalga epifiton di Danau Tempe. Kerapatan tumbuh berhubungan dengan penerimaan cahaya pada substrat, sehingga makrofita dengan kerapatan rendah memiliki kelimpahan epifiton lebih tinggi dibandingkan makrofita yang tumbuh rapat. Dengan demikian, pengaturan kerapatan makrofita bisa menjadi salah satu strategi dalam pengelolaan kawasan dengan menjaga keberlanjutan populasi epifiton sebagai produsen primer yang penting di perairan danau dangkal seperti Danau Tempe.Kata kunci:   makrofita, mikroalga epifiton, kerapatan tumbuh, produktivitas perikanan, Danau Tempe
Growth of the water fleas Daphnia magna (Straus, 1820) at different trophic levels of two small urban lakes in Indonesia Tanjung, Livia Rossila; Chrismadha, Tjandra; Nafisyah , Eva
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 29 No. 1 (2023)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2023.1099

Abstract

Nutrient enrichment in waters that has become a major environmental problem is related to excessive loading of nutrients into aquatic ecosystems. This nutrient enrichment, called eutrophication, favors phytoplankton growth, which can function as a natural daphnid feed. This study examined the growth performance of the water fleas Daphnia magna in water collected from small lakes (ponds) of different trophic levels. The water was taken from Situ Rawa Kalong, considered eutrophic from its dark green color, and the less eutrophic Situ Cibuntu with relatively clear water. Daphnids were grown in six aquaria filled with water from both ponds without artificial feeding with an initial density of five individuals/L. Samples of daphnids were taken every three to four days to observe their growth and reproduction, along with water samples to analyze the chlorophyll content and total suspended solids (TSS). The result showed that the eutrophic water of Situ Rawa Kalong favored phytoplankton growth, indicated by a consistently higher chlorophyll content in the water ranging from 35.3 to 140.7 μg/L compared to less eutrophic water of Situ Cibuntu with chlorophyll content ranging from 1.4 to 13.2 μg/L throughout the experiment. A much higher daphnid density of 151.7 individuals/L was achieved with more water chlorophyll content, meaning phytoplankton availability became a controlling factor for daphnid growth in the pond waters. This study reveals the functional relationships in the food chain between the water trophic level, the abundance of phytoplankton as the primary producer, and daphnids as the first-order predator. It also suggests that the open water trophic level can be managed to favor the daphnid growth, which can then be harvested for use as natural feed.
Co-Authors Chrismadha, Tjandra Nafisyah , Eva Nofdianto, Nofdi