Gracilaria (Gigartinales, Rhodophyta) and productivity

McLachlan, J.; Bird, C. J.

doi:10.1016/0304-3770(86)90004-5

Cited by 75 publications

(39 citation statements)

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“…The starch content of the alga decreased when cultivation in light was followed by a post-treatment of darkness for 3 days (Ekman & Pedersen, 1990). Minor changes in agar yield were also shown and it was suggested that they reflected changes in algal starch content (Ekman & Pedersen, 1990), as starch may be present as a contaminant of agar extracts [McLachlan & Bird, 1986;Rotem, Roth-Bejerano & (Malis) Arad, 1986;Ekman & Pedersen, 1990].…”

mentioning

confidence: 99%

Effects of altered salinity, darkness and algal nutrient status on floridoside and starch content, α-galactosidase activity and agar yield of cultivatedGracilaria sordida

Ekman

Pedersén

1991

British Phycological Journal

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mentioning

confidence: 99%

Effects of altered salinity, darkness and algal nutrient status on floridoside and starch content, α-galactosidase activity and agar yield of cultivatedGracilaria sordida

Ekman

Pedersén

1991

British Phycological Journal

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“…Laju pertumbuhan relatif sejumlah spesies Gracilaria sp. yang dibudidayakan di bawah kondisi penelitian yang berbeda memperlihatkan variasi yang kecil, umumnya 5%-10%/hari, tetapi pada periode pemeliharaan yang lebih lama, laju pertumbuhan relatif menjadi lebih rendah (MacLachlan & Bird, 1986). Nelson et al (2001) melaporkan bahwa laju pertumbuhan relatif rumput laut (Gracilaria parvispora) berkisar antara 4,3 dan 5,3 dengan rata-rata 4,7%/hari yang dipelihara pada saluran tambak pembuangan udang yang berbeda.…”

Section: Hasil Dan Bahasanunclassified

“…o C atau lebih, tetapi pada suhu yang lebih tinggi lagi dapat menurunkan pertumbuhan rumput laut. Pada musim dingin di mana suhu air lebih rendah akan membatasi pertumbuhan rumput laut (MacLachlan & Bird, 1986). Dengan demikian variasi suhu yang relatif kecil dan suhu air yang berada pada kisaran yang mendukung pertumbuhan rumput laut, merupakan penyebab suhu air tidak dapat digunakan untuk memprediksi pertumbuhan rumput laut di tambak tanah sulfat masam.…”

Section: Hasil Dan Bahasanunclassified

PEUBAH KUALITAS AIR YANG MEMPENGARUHI PERTUMBUHAN RUMPUT LAUT (Gracilaria verrucosa) DI TAMBAK TANAH SULFAT MASAM KECAMATAN ANGKONA KABUPATEN LUWU TIMUR PROVINSI SULAWESI SELATAN

Mustafa

Rachmansyah

Trijuno

et al. 2009

Jurnal Riset Akuakultur

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ABSTRAKRumput laut (Gracilaria verrucosa) telah dibudidayakan di tambak tanah sulfat masam dengan kualitas dan kuantitas produksi yang relatif tinggi. Oleh karena itu, dilakukan penelitian yang bertujuan untuk mengetahui peubah kualitas air yang mempengaruhi laju pertumbuhan rumput laut di tambak tanah sulfat masam Kecamatan Angkona Kabupaten Luwu Timur Provinsi Sulawesi Selatan. Pemeliharaan rumput laut dilakukan di 30 petak tambak terpilih selama 6 minggu. Bibit rumput laut dengan bobot 100 g basah ditebar dalam hapa berukuran 1,0 m x 1,0 m x 1,2 m. Peubah tidak bebas yang diamati adalah laju pertumbuhan relatif, sedangkan peubah bebas adalah peubah kualitas air yang meliputi: intensitas cahaya, salinitas, suhu, pH, karbondioksida, nitrat, amonium, fosfat, dan besi. Analisis regresi berganda digunakan untuk menentukan peubah bebas yang dapat digunakan untuk memprediksi peubah tidak bebas. Hasil penelitian menunjukkan bahwa laju pertumbuhan relatif rumput laut di tambak tanah sulfat masam berkisar antara 1,52% dan 3,63%/hari dengan rata-rata 2,88% ± 0,56%/ hari. Di antara 9 peubah kualitas air yang diamati ternyata hanya 5 peubah kualitas air yaitu: nitrat, salinitas, amonium, besi, dan fosfat yang mempengaruhi pertumbuhan rumput laut secara nyata. Untuk meningkatkan pertumbuhan rumput laut di tambak tanah sulfat masam Kecamatan Angkona Kabupaten Luwu Timur dapat dilakukan dengan pemberian pupuk yang mengandung nitrogen untuk meningkatkan kandungan amonium dan nitrat serta pemberian pupuk yang mengandung fosfor untuk meningkatkan kandungan fosfat sampai pada nilai tertentu, melakukan remediasi untuk menurunkan kandungan besi serta memelihara rumput laut pada salinitas air yang lebih tinggi, tetapi tidak melebihi 30 ppt.

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“…Thus, these species mainly thrive unattached and epiphytic. Overall, G. verrucosa was the most abundant species, adding a high recruitment ability to an array of previously described successful lagoon adaptations, including high stress tolerance (Chapter 5, Stokke 1956), high growth and recovery potential (Chapter 5, Hanisak et al 1979, McLachlan & Bird 1986) and strong association with the polychaete facilitator Diopatra cuprea (Chapter 3), together explaining the ubiquity of this species in North American east coast lagoons (Cowper 1978, Goshorn et al 2001, Chapter 2, Humm 1944, Peckol & Rivers 1996 hydrodynamic forcing may frequently generate fragments to the drift algal assemblages (Chapter 2, 3, 4). Also, because unattached algae in general do not become reproductive (Norton & Mathieson 1983), the algae attached to the oyster reefs ensures that a propagule bank is constantly produced (Santelices et al 1995).…”

Section: Recruitment In Open Plotsmentioning

confidence: 99%

“…G. verrucosa was a key species explaining a large proportion of the richness data, typically carrying 1-3 epiphytic algal taxa. Thus, because of its wide distribution pattern, high biomass, high productivity (McLachlan & Bird 1986, Tyler 2002) and its consistent epiphytic flora, G. verrucosa can be considered a foundation species within Hog Island Bay (sensu Dayton 1972). Species that were found year-round (G. verrucosa, A. subulata, F. vesiculosus, C. fragile, and U. curvata) have perennial life history strategies (Schneider & Searles 1991), with the exception of U. curvata which typically has an ephemeral and highly fluctuating appearance (Littler 1980, Sears 1975, Wallentinus 1984.…”

Section: Species Patternsmentioning

confidence: 99%

Macroalgal Distribution Patterns and Ecological Performances in a Tidal Coastal Lagoon, with Emphasis on the Non-indigenous Codium Fragile ssp. Tomentosoides

Thomsen¹

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Codium fragile ssp. tomentosoides is a North-West Pacific macroalgae that has invaded numerous lagoons. The success of C. fragile has been explained by its dispersal capacity, growth rate, nutrient uptake, salinity and temperature tolerances, and grazer resistance. I compared distribution, recruitment and growth of Codium to native algae in Hog Island Bay, a shallow water lagoon in Virginia. To determine the extent of invaded habitats algae were mapped from 1998-02. Codium was fourth most abundant, and hence considered successful compared to most species in terms of its biomass. Codium was found both unattached or attached to bivalve shells, while the majority of the dominant Gracilaria verrucosa and Ulva curvata were incorporated into tube caps of the polychaete Diopatra cuprea. Preference experiments showed that Diopatra incorporated Ulva and Gracilaria most, Agardhiella subulata intermediate, and Codium and Fucus vesiculosus least, and that the first 3 species were fragmented in the process. Thus, Diopatra facilitated Ulva and Gracilaria, by providing an abundant substrate, reducing flushing and maintaining a supply of fragments for regrowth. Tidal lagoons are characterized by sedimentation, desiccation, high turbidity, and high abundance of molluscan grazers. Short-term experiments showed that Codium was inferior under such conditions compared to Gracilaria, Ulva, Hypnea musciformis, and Agardhiella, decomposing faster when buried, being susceptible to desiccation, growing slower at high and low levels of nutrient and light, and being the only species grazed by Ilyanasa obsolata. To test if the success of Codium fragile could be related to its ability to colonize hard substrate, recruitment bricks were incubated in the shallow subtidal with ii ii and without a cover of unattached algae or sediments. Codium recruited well onto control bricks, but not onto bricks covered by algae or sediments. After one year Codium, Gracilaria, Crassostrea virginica (oyster) and Agardhiella were space-dominants, having tolerated temperature regimes of 2-28ºC and desiccation at low spring tides. Thus Codium is only successful compared to native species by having moderate growth over a long season, and by being an effective colonizer of hard substrate in the shallow subtidal zone in the absence of high sedimentation or drift algae accumulations.

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Gracilaria (Gigartinales, Rhodophyta) and productivity

Cited by 75 publications

References 50 publications

Effects of altered salinity, darkness and algal nutrient status on floridoside and starch content, α-galactosidase activity and agar yield of cultivatedGracilaria sordida

Effects of altered salinity, darkness and algal nutrient status on floridoside and starch content, α-galactosidase activity and agar yield of cultivatedGracilaria sordida

PEUBAH KUALITAS AIR YANG MEMPENGARUHI PERTUMBUHAN RUMPUT LAUT (Gracilaria verrucosa) DI TAMBAK TANAH SULFAT MASAM KECAMATAN ANGKONA KABUPATEN LUWU TIMUR PROVINSI SULAWESI SELATAN

Macroalgal Distribution Patterns and Ecological Performances in a Tidal Coastal Lagoon, with Emphasis on the Non-indigenous Codium Fragile ssp. Tomentosoides

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