5. KESIMPULAN DAN SARAN
5.2. Saran
Hasil dari penelitian ini ada beberapa saran penting yang dapat dilakukan khususnya dalam menunjang kesempurnaan biokriteria (IBT) yang baru dibentuk antara lain:
1. Perlu adanya penambahan stasiun yang berfungsi sebagai situs rujukan, sehingga dapat mewakili DAS Ciliwung hulu secara keseluruhan. Di samping
95
itu penambahan kasus dari situs uji juga perlu dilakukan agar dapat dievaluasi sensitifitas dari IBT dalam mencerminkan gangguan ekologi di situs yang lain dari Sungai Ciliwung.
2. Perlu adanya usaha konservasi terutama di bagian hulu Sungai Ciliwung karena vegetasi riparian dapat berfungsi sebagai sumber materi allochtonous bagi larva Trichoptera maupun makrozoobentos secara keseluruhan. Disamping itu vegetasi tersebut juga berfungsi sebagai sumber penyedia makanan (nektar) bagi Trichoptera dewasa.
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Lampiran 1. Isian penilaian yang digunakan dalam penghitungan indeks habitat Penilaian habitat untuk bagian jeram (riffle) dan lubuk (pool).
Nama tempat : Tanggal: / / 02 Kunjungan ke : Kode tempat : Nama Team :
Total Score :
Kategori
Optimal Sub Optimal Marginal Buruk/ Poor
1. Substrat epifaunal/ ketersediaan penutup
(Gradien tinggi dan rendah)
Lebih besar dari 70% (50% untuk aliran stream yang bergradien rendah) dari substrat yang diinginkan guna
kolonisasi epifauna dan perlindungan ikan; campuran dari potongan daun, kayu terendam, kerikil, atau habitat lainnya yang stabil dan tahap yang mengijinkan potensi terbentuknya kolonisasi secara penuh (Misal potongan kayu yang bukan berasal dari jatuhan baru dan bukan
40-70% (30-50% untuk gradien stream yang bergradien rendah) campuran dari habitat stabil, cukup baik untuk potensi kolonisasi secara penuh, cukupnya habitat untuk pemeliharaan populasi, adanya substrat tambahan dalam bentuk jatuhan baru tetapi belum menyajikan untuk
kolonisasi.
20-40% (10-30% untuk rendahnya gradien stream) campuran dari habitat stabil,
ketersediaan habitat kurang dari yang diinginkan, substrat seringkali mengalami gangguan atau hilang
Kurang dari 20 % (10% untuk rendahnya gradien stream) habitat stabil, hilangnya habitat secara jelas, substrat tidak stabil atau hilang
109
dari transient)
SCORE: 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
2a. Banyaknya Batu yang tertanam (Gradien tinggi)
Gravel, coble dan boulder
antara 0-25% dan dikelilingi oleh sedimen halus, lapisan oleh coble menyediakan ruang untuk niche
Gravel, coble dan
boulder antara 25% - 50% dan dikelilingi oleh sedimen halus
Gravel, coble dan
boulder antara 50-75% dikelilingi oleh sedimen halus
Gravel, coble dan
boulder lebih dari 75% dikelilingi oleh sedimen halus SCORE: 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 2b. Substrat Pool/ genangan (Gradien rendah) Campuran material substrat dengan gravel dan pasir yang merata , material akar dan vegetasi submerged ada secara umum
Campuran dari pasir halus, lumpur dan tanah liat: lumpur mungkin dominan, bbrp material akar dan submerged vegetasi ada.
Seluruhnya lumpur, tanah liat atau dasar pasir , sedikit atau tidak ada material akar: tidak ada tumbuhan submerged.
Lempung yang mengeras atau batuan dasar, tidak ada material akar atau tumbuhan submerged. SCORE: 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 3a. Kecepatan/regime kedalaman (Gradien Tinggi)
Seluruh keempat strata /regime kecepatan/ kedalaman ada (lambat dalam, lambat dangkal,
Hanya tiga dari empat rezim ada (jika cepat dangkal tidak ada, score lebih rendah drpd jika
Hanya 2 dari empat habitat rezim ada (jika cepat dangkal atau
lambat dangkal tidak ada,
Didominasi oleh satu rezim kecepatan / kedalaman (biasanya lambat dalam).
cepat dalam dan cepat dangkal), lambat : < 0,3m/det, dalam > 0,5 m.
regime lainnya tidak ada).
maka nilainya rendah)
SCORE: 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
3b. variabilitas Pool (Gradien rendah)
Gabungan yang merata antara besar dangkal,