scholarly journals HUBUNGAN IKAN PELAGIS DENGAN KONSENTRASI KLOROFIL-A DI LAUT JAWA

2015 ◽  
Vol 6 (1) ◽  
pp. 21
Author(s):  
Kamaluddin Kasim ◽  
Setiya Triharyuni ◽  
Arief Wujdi
Keyword(s):  
Chlorophyll A ◽  
Aquatic Organism ◽  
Predator Species ◽  
Pelagic Species ◽  
Photosynthetic Organisms ◽  
Bivariate Correlation ◽  
Java Sea ◽  
Rastrelliger Kanagurta ◽  
Euthynnus Affinis ◽  
As Relationship

Klorofil-a banyak ditemukan pada fitoplankton dan menjadi indikator kesuburan perairan. Keberadaan fitoplankton ditandai dengan kandungan klorofil-a yang tinggi dan diikuti oleh keberadaan zooplankton yang akhirnya mempengaruhi keberadaan organisme perairan lainnya seperti ikan pelagis kecil maupun ikan pelagis besar sebagai suatu rantai makanan. Interaksi antara konsentrasi klorofil-a terhadap keberadaan dan konsentrasi ikan pelagis di Laut Jawa belum banyak diketahui. Penelitian ini dimaksudkan untuk mengetahui hubungan interaksi antara klorofil-a terhadap konsentrasi ikan pelagis. Penelitian dilakukan dengan mengumpulkan data runtun waktu hasil tangkapan beberapa jenis pelagis besar dan kecil yang didaratkan di PPI Pekalongan tahun 2007-2011 serta data runtun waktu konsentrasi klorofil-a dari perairan utara Jawa yang diperoleh dari informasi sekunder.Metode analisis korelasi linear sederhana (bivariate correlation) digunakan untukmengetahui ada atau tidaknya pengaruh antar variabel klorofil-a dan konsentrasi ikan pelagis. Hasil penelitian menunjukkan bahwa ikan layang (Decapterus russelli) paling nyata mendapat pengaruh dari konsentrasi klorofil-a (P<0,05) dan berkorelasi positif terhadap konsentrasi klorofil-a dengan nilai koefisien korelasi ( r ) sebesar 0,56, sedangkan ikan pelagis lainnya berkorelasi negatif. Ikan tongkol (Euthynnus affinis) posisinya menempati rantai makanan paling tinggi sebagai pemangsa, mempunyai korelasi positif (r = 0,5) terhadap Rastrelliger kanagurta dan r = 0,56 terhadap Amblygaster sirm.Chlorophyll-a is a light-absorbing pigment that can be found in photosynthetic organisms such as algae and phytoplankton. The evidence of phytoplankton that indicated by high contents of chlorophyll-a may followed the evidence of zooplankton and other micro aquatic organism as a food chain component. An overview of interrelationships between chlorophyll-a and pelagic fishes in the waters around Java Sea have not much investigated. The research was attempted to study the interaction between chlorophyll-a abundance and the abundance of small and large pelagic as well as relationship among small and large pelagic as prey-predators component. Research conducted by collecting time series catch data of small and large pelagic species landed at PPI Pekalongan during the period of 2006-2012, as well as the data of chlorophyll-a abundance through previous research studies. The results showed that layang (Decapterus russelli) was the most significant species that positively correlated to abundance of chlorophyll-a (P < 0.05) with value of r = 0.6. while others pelagic species have negative correlation. As a predator species, tongkol (Euthynnus affinis) was positively correlated ( r = 0.5) to the abundance of banyar (Rastrelliger kanagurta) as well as juwi (Amblygaster sirm) with r value 0.56.

scholarly journals POLA DAN MUSIM PEMIJAHAN IKAN TONGKOL KOMO (Euthynnus affinis Cantor, 1850) DI LAUT JAWA

2017 ◽  
Vol 8 (2) ◽  
pp. 101
Author(s):  
Thomas Hidayat ◽  
Endah Febrianti ◽  
Yoke Hani Restiangsih
Keyword(s):  
Chlorophyll A ◽  
Species Group ◽  
Spawning Season ◽  
Central Java ◽  
Gonad Somatic Index ◽  
Java Sea ◽  
Oceanographic Data ◽  
Euthynnus Affinis ◽  
Somatic Index ◽  
Partial Spawner

Ikan tongkol komo (Euthynnus affinis, Cantor 1850) merupakan salah satu jenis kelompok ikan pelagis besar yang banyak didaratkan oleh armada jarring insang dan pukat cincin di Tegal. Tersedianya data dan informasi tentang pola dan musim pemijahan merupakan bagian dari pengetahuan yang diperlukan untuk mengetahui status sumberdaya bagi upaya pengelolaanya. Penelitian ini ditujukan untuk mendapatkan pola dan musim pemijahan ikan tongkol komo di Laut Jawa khususnya di pantai Tegal dan sekitarnya. Penelitian dilakukan pada bulan Februari-Desember 2012 di tempat pendaratan ikan kota Tegal, Jawa Tengah. Pendugaan pola pemijahan berdasarkan pengamatan sebaran frekuensi diameter telur sedangkan pendugaan musim pemijahan menggunakan pendekatan Indeks Kematangan Gonad (IKG) atau Gonado somatic index (GSI) bulanan. Analisis data oseanografi khususnya suhu permukaan laut (SPL) dan konsentrasi klorofil-a berdasarkan citra satelit Aqua Modis digunakan sebagai data dukung musim pemijahan. Hasil penelitian menunjukkan pola pemijahan tongkol komo di Laut Jawa memiliki strategi reproduksi beberapa kali memijah (partial spawner). Fekunditas berkisar antara 225.760-2.601500 telur. Musim pemijahan terjadi pada Juni-Agustus dimana konsentrasi klorofil-a tinggi.Kawakawa (Euthynnus affinis, Cantor 1850) is one of large pelagic species group caught by drift gill nets and purse seine fisheries in the Java Sea. The information of spawning characteristics is crucial for fisheries management. This research aims to determine the spawning strategy of kawakawa in the Java Sea mainly in Tegal and adjacent waters. Observation has been conducted during February-December 2012 in Tegal, Central Java. The estimation the spawning season determined by using Gonad somatic index (GSI) and investigated with profiling oceanographic data on sea surface temperature (SST) and concentration of chlorophyll-a derived from Aqua Modis satellite imagery. The results showed the reproductive strategy of kawakawa in the Java Sea is partial spawner. Fecundity ranged between 225,760-2,601,500 eggs and the spawning season occurs in June-August where concentrations of chlorophyll-a high.

scholarly journals Macroalgae

Encyclopedia ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 177-188
Author(s):  
Leonel Pereira
Keyword(s):  
Carbon Dioxide ◽  
Chlorophyll A ◽  
Red Algae ◽  
Great Variability ◽  
Marine Macroalgae ◽  
Brown Macroalgae ◽  
Green Macroalgae ◽  
Red Macroalgae ◽  
Photosynthetic Organisms ◽  
Green Pigments

What are algae? Algae are organisms that perform photosynthesis; that is, they absorb carbon dioxide and release oxygen (therefore they have chlorophyll, a group of green pigments used by photosynthetic organisms that convert sunlight into energy via photosynthesis) and live in water or in humid places. Algae have great variability and are divided into microalgae, small in size and only visible through a microscope, and macroalgae, which are larger in size, up to more than 50 m (the maximum recorded was 65 m), and have a greater diversity in the oceans. Thus, the term “algae” is commonly used to refer to “marine macroalgae or seaweeds”. It is estimated that 1800 different brown macroalgae, 6200 red macroalgae, and 1800 green macroalgae are found in the marine environment. Although the red algae are more diverse, the brown ones are the largest.

scholarly journals Fishing Ground Mapping Based on Chlorophyll-A Distribution Using Aqua Modis Satellite Imagery in The Fisheries Management Area (FMA) 712

2021 ◽  
Vol 324 ◽  
pp. 01007
Author(s):  
Yulius Yulius ◽  
Vaninda Aidina ◽  
Muhammad Ramdhan ◽  
August Daulat
Keyword(s):  
Chlorophyll A ◽  
Fisheries Management ◽  
Satellite Imagery ◽  
Time Series Data ◽  
Monsoon Season ◽  
Fishing Ground ◽  
Series Data ◽  
Chlorophyll A Concentration ◽  
Management Area ◽  
Java Sea

The fishing ground is identical and closely related to chlorophyll-a abundance in the waters, associated with its fisheries potential. This research has been conducted to determine the concentration and distribution of chlorophyll-a in the seas, especially in the Fisheries Management Area (FMA) 712 encompassing the Java Sea. The analysis used monthly time-series data collected from the satellite imagery over the last 11 years, taken through the ERDDAP website. The mean concentration of chlorophyll-a in the study area was 1.13 mg/l in June 2013. Based on 11 years of data processing, it can be concluded that the highest concentration of chlorophyll-a occurred in the west monsoon season from November to April, where increased rainfall caused the nutrient wash from terrestrial to the open waters. The lowest chlorophyll-a concentration happened in the east monsoon season from April to November, where the dry season arrived. The existence of pelagic fishes in FMA 712, such as Sardinella Lemurs and Sardinella Fimbriata, in waters highly influenced by the chlorophyll-a concentration, while Thunnus Sp. and Exocoetidae Sp. not affected significantly to the existence of chlorophyll-a concentration and its distribution.

Structural effects on epimerization of bacteriochlorophyll a and chlorophyll a revealed using 3-acetyl chlorophyll a

2020 ◽  
Vol 24 (04) ◽  
pp. 499-504 ◽  
Author(s):  
Yoshitaka Saga ◽  
Shiori Nakagawa
Keyword(s):  
Physicochemical Properties ◽  
Chlorophyll A ◽  
Photosynthetic Reaction Center ◽  
Molecular Structures ◽  
Structural Factors ◽  
Structural Effects ◽  
Photosynthetic Organisms ◽  
Acetyl Group ◽  
Kinetics Of

Chlorophyll (Chl) and bacteriochlorophyll (BChl) pigments, which are crucial cyclic tetrapyrroles in photosynthesis, generally have a chiral center in their exo-cyclic five-membered E-ring. Although [Formula: see text]-epimers (primed-type) of (B)Chl pigments are rarely present in photosynthetic organisms, they play key roles in photosynthetic reaction center complexes. The epimerization mechanism of (B)Chl pigments in vivo has not been unraveled. The structural effects on the physicochemical properties of (B)Chl epimerization reactions provide useful information to tackle this question. We analyzed epimerization of three pigments, BChl [Formula: see text], Chl [Formula: see text], and 3-acetyl Chl [Formula: see text], to elucidate the structural factors that are responsible for epimerization reactions. We compared the epimerization kinetics of the three pigments and concluded that the bacteriochlorin skeleton (7,8,17,18-tetrahydroporphyrin) significantly retarded the epimerization kinetics. Thus, BChl [Formula: see text] exhibited slower epimerization kinetics than Chl [Formula: see text] in spite of the presence of the electron-withdrawing 3-acetyl group that accelerates epimerization. In contrast to the large structural effects of (B)Chl molecules on epimerization kinetics, the thermodynamic properties at equilibrium in the epimerization of the three pigments were barely influenced by their molecular structures. This study also demonstrates that a semi-synthetic pigment, 3-acetyl Chl [Formula: see text], is appropriate for comparative analyses of the structural effects of BChl [Formula: see text] and Chl [Formula: see text] on their physicochemical properties.

Hydroxylation of the C132 and C18 carbons of chlorophylls by heme and molecular oxygen

2015 ◽  
Vol 19 (09) ◽  
pp. 1007-1013 ◽  
Author(s):  
Patrick C. Loughlin ◽  
Robert D. Willows ◽  
Min Chen
Keyword(s):  
Aqueous Solution ◽  
Molecular Oxygen ◽  
Chlorophyll A ◽  
Oxidation Products ◽  
Chlorophyll B ◽  
Need For Care ◽  
Photosynthetic Organisms ◽  
Major Oxidation ◽  
Oxygen Atoms

Following extraction from photosynthetic organisms, chlorophylls are prone to reactions including demetalation, dephytylation and specific oxidations of the exocyclic ring E, termed allomerizations. Allomerization of chlorophylls has been well-characterized in methanol and to a lesser extent in aqueous solution. Here we detail novel allomerization-like reactions of chlorophyll a and chlorophyll b. In the presence of heme, detergent-solubilized chlorophyll a is hydroxylated at its C 132 position in ring E and, surprisingly, the C 18 position in ring D. Two major oxidation products are synthesized — a C 132- OH and a C 132- OH , C 18- OH derivative of chlorophyll a. We track the origin of the oxygen atoms added in these hydroxylated chlorophylls using 18 O 2 labeling and demonstrate that the additional oxygen atoms are derived from molecular oxygen. A similar heme-catalyzed reaction is also observed using chlorophyll b as a substrate. These results highlight the need for care when dealing with extracted chlorophylls and demonstrate an unusual hydroxylation of the C 18 position of chlorophylls in the presence of heme.

Influence of Molecular Oxygen on the Chlorophyll Fluorescence Decay of Green Algae

1999 ◽  
Vol 54 (5-6) ◽  
pp. 348-352 ◽  
Author(s):  
Silke Oellerich ◽  
Daniel Berg ◽  
Karlheinz Maier ◽  
Frank Terjung
Keyword(s):  
Chlorophyll Fluorescence ◽  
Molecular Oxygen ◽  
Chlorophyll A ◽  
Green Algae ◽  
Chlorella Vulgaris ◽  
Fluorescence Decay ◽  
Singlet Excited State ◽  
Chlorophyll Fluorescence Quenching ◽  
Photosynthetic Organisms ◽  
Quenching By Oxygen

Abstract Chlorella vulgaris, Chlorophyll Fluorescence Quenching, Green Algae, Molecular Oxygen Molecular oxygen can act as a collisional quencher of the singlet excited state of chlorophyll a. This effect is well described for chlorophyll a in various solvents but not for chlorophyll a in the antenna complexes of photosynthetic organisms. We studied the chlorophyll fluorescence decay of Chlorella vulgaris cells under different oxygen concentrations but did not find any evidence for quenching by oxygen.

scholarly journals On the relation amongst limnological factors and fish abundance in reservoirs at semiarid region

2015 ◽  
Vol 27 (1) ◽  
pp. 24-38 ◽  
Author(s):  
Ronaldo César Gurgel-Lourenço ◽  
Carlos Alberto de Sousa Rodrigues-Filho ◽  
Ronaldo Angelini ◽  
Danielle Sequeira Garcez ◽  
Jorge Iván Sánchez-Botero
Keyword(s):  
Dissolved Oxygen ◽  
Chlorophyll A ◽  
Rainy Season ◽  
Activity Patterns ◽  
Species Abundance ◽  
Temporal Patterns ◽  
Abundant Species ◽  
Fish Abundance ◽  
Semiarid Region ◽  
Predator Species

Aim:To evaluate possible nycthemeral and seasonal temporal patterns in fish assemblage associated with limnological aspects and biotic factors in two reservoirs in semarid Northeastern Brazil.MethodsFish were sampled with gillnets in nycthemeral cycles throughout the dry and rainy season in two reservoirs (Paulo Sarasate/PS and Edson Queiroz/EQ). The stomach contents of the predator species were surveyed. The limnological variables were submitted to principal components analysis, while their relation to fish abundance was determined by canonical correspondence analysis. Temporal patterns in relative fish species abundance were detected with nMDS.ResultsTemperature and dissolved oxygen levels segregated the reservoirs physico-chemically. Turbidity and chlorophyll-a levels differed between seasons, and the relative abundance of species differed between the reservoirs. Predators were more abundant in PS, while detritivores were more abundant in EQ. Triportheus signatusand Plagioscion squamosissimus were the most abundant species in both reservoirs. In general, predator abundance was positively associated with high temperature and dissolved oxygen (PS>EQ) and negatively associated with turbidity. The activity patterns of P. squamosissimus could not be explained by fluctuations in environmental variables. Non-predators tended to cluster around the vectors chlorophyll-a, pH and turbidity. Predators had a more diversified diet in PS in accordance with food availability, while predators in EQ ate only fish and shrimp. Nycthemeral patterns varied for the same species depending on the reservoir. Generally, in PS predators were more active during daylight hours while non-predators were more active after dark. However, in EQ predators and non-predators displayed similar nycthemeral activity patterns. Regardless of the reservoir, predators were more abundant in the rainy season. No seasonal trend was observed for non-predators.ConclusionsLimnological differences between PS and EQ influenced temporal species abundance patterns. The species distribution was determined by predation conditions and physiological attributes.

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