Warohmah, Jihan Mawadda and Prof. Dr. Ir. Muhammad Musa,, MS (2023) Hubungan Rasio N/P terhadap Komposisi dan Kelimpahan Fitoplankton pada Air Baku untuk Tambak Udang Vanname (Litopenaeus vannamei) di Pesisir Probolinggo. Sarjana thesis, Universitas Brawijaya.
Abstract
Fitoplankton merupakan organisme yang bergerak mengikuti arus dan memiliki peran dalam produktivitas primer perairan. Keberadaan fitoplankton dipengaruhi oleh ketersediaan nutrien di perairan. Nutrien yang berperan sebagai faktor pembatas pada pertumbuhan fitoplankton ialah Nitrat dan Fosfat. Kedua nutrien tersebut dapat mempengaruhi kelimpahan serta komposisi fitoplankton. Perairan pesisir Probolinggo merupakan daerah yang banyak dimanfaatkan untuk kegiatan perikanan contohnya tambak Udang Vanname (Litopenaeus vannamei). Aktivitas manusia seperti pembuangan limbah ke badan perairan, kegiatan pertanian dan perindustrian berpengaruh terhadap kualitas perairan dan unsur hara di perairan. Tujuan penelitian yaitu menganalisis konsentrasi Nitrat dan Fosfat pada air baku untuk tambak Udang Vanname di pesisir Probolinggo, menganalisis komposisi dan kelimpahan fitoplankton pada air baku untuk tambak Udang Vanname di pesisir Probolinggo dan menganalisis hubungan rasio N/P terhadap komposisi dan kelimpahan fitoplankton pada air baku untuk tambak Udang Vanname di pesisir Probolinggo.Penelitian dilaksanakan pada bulan Februari hingga Maret 2023 di pesisir Probolinggo, Jawa Timur. Data primer yang diambil meliputi sampel air pesisir yang diperoleh menggunakan metode purposive sampling. Parameter kualitas air yang diukur secara in situ pada penelitian ini yaitu suhu, kecerahan, pH, DO, dan salinitas. Sementara itu, parameter nitrit, nitrat, fosfat dan amonia dianalisis di Laboratorium Hidrobiologi Divisi Lingkungan Perairan Fakultas Perikanan dan Ilmu Kelautan Universitas Brawijaya. Parameter biologi meliputi kelimpahan fitoplankton, kelimpahan relatif, indeks dominansi dan indeks keanekaragaman. Hubungan nitrat dan fosfat terhadap kelimpahan fitoplankton dianalisis menggunakan regresi linier berganda pada software SPSS 26. Hasil penelitian diperoleh konsentrasi nitrat di perairan pesisir Probolinggo berkisar antara 0,1977 mg/l – 0,6268 mg/l, sementara itu konsentrasi orthofosfat berkisar antara 0,0429 mg/l – 0,5454 mg/l. Komposisi fitoplankton yang diperoleh terdiri dari 4 divisi dan 23 genus dengan kelimpahan berkisar antara 259-5.184 mg/l. Data kelimpahan fitoplankton yang diperoleh menunjukkan bahwa pesisir Probolinggo tergolong ke dalam perairan oligotrofik – mesotrofik. Rasio N/P di perairan pesisir Probolinggo berkisar antara 1 : 1 hingga 6,5 : 1. Divisi fitoplankton yang paling banyak ditemukan perairan pesisir Probolinggo ialah Ochrophyta dengan kelas Bacillariophyceae atau biasa disebut diatom. Hasil regresi linier berganda pada nitrat dan fosfat terhadap kelimpahan fitoplankton diperoleh persamaan yaitu Y = 8,856 + 2,067X1 – 0,187X2. Keoefisien determinasi yang diperoleh sebesar 37,8% yang berarti hubungan nitrat dan fosfat terhadap kelimpahan fitoplankton bernilai sedang.
English Abstract
Phytoplankton are organisms that move with the current and have a role in the primary productivity of waters. The existence of phytoplankton is influenced by the availability of nutrients in the waters. Nutrients that act as limiting factors in the growth of phytoplankton are nitrates and phosphates. Both of these nutrients can affect the abundance and composition of phytoplankton. Probolinggo coastal waters are an area that is widely used for fishing activities, for example Vanname Shrimp (Litopenaeus vannamei) ponds. Human activities such as dumping waste into water bodies, agricultural and industrial activities affect water quality and nutrients in waters. The aims of the study were to analyze the concentration of Nitrate and Phosphate in raw water for Vanname Shrimp ponds on the coast of Probolinggo, to analyze the composition and abundance of phytoplankton in the raw water for Vanname Shrimp ponds on the coast of Probolinggo and to analyze the relationship between the ratio of N/P to the composition and abundance of phytoplankton in raw water for Vanname Shrimp ponds on the coast of Probolinggo. The research was conducted from February to March 2023 on the coast of Probolinggo, East Java. Primary data taken includes samples of coastal water obtained using a purposive sampling method. Water quality parameters measured in situ in this study were temperature, brightness, pH, DO, and salinity. Meanwhile, the parameters of nitrite, nitrate, phosphate and ammonia were analyzed at the Hydrobiology Laboratory of the Aquatic Environment Division, Faculty of Fisheries and Marine Sciences, Universitas Brawijaya. Biological parameters include the abundance of phytoplankton, relative abundance, dominance index and diversity index. The relationship between nitrate and phosphate to the abundance of phytoplankton was analyzed using multiple linear regression in SPSS 26 software. The results showed that the concentration of nitrate in the coastal waters of Probolinggo ranged from 0,1977 mg/l – 0,6268 mg/l, while the concentration of orthophosphate ranged from 0,0429 mg/l – 0,5454 mg/l. The composition of the phytoplankton obtained consisted of 4 divisions and 23 genera with abundances ranging from 259-5184 mg/l. The phytoplankton abundance data obtained shows that the coast of Probolinggo belongs to the oligotrophic – mesotrophic waters. The N/P ratio in the coastal waters of Probolinggo ranges from 1 : 1 to 6.5 : 1. The most common phytoplankton division found in the coastal waters of Probolinggo is Ochrophyta with the class Bacillariophyceae or commonly called diatoms. The results of multiple linear regression on nitrate and phosphate on the abundance of phytoplankton obtained the equation that is Y = 8.856 + 2.067X1 – 0.187X2. The coefficient of determination obtained was 37.8%, which means that the relationship between nitrate and phosphate to the abundance of phytoplankton was moderate.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 0523080483 |
| Subjects: | 300 Social sciences > 333 Economics of land and energy > 333.9 Other natural resources > 333.95 Biological resources > 333.956 Fishes |
| Divisions: | Fakultas Perikanan dan Ilmu Kelautan > Manajemen Sumberdaya Perairan |
| Depositing User: | Sugeng Moelyono |
| Date Deposited: | 13 Dec 2023 03:47 |
| Last Modified: | 13 Dec 2023 03:47 |
| URI: | http://repository.ub.ac.id/id/eprint/205157 |
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