scholarly journals The Production of Organic Matter from Rhizophora mucronata and Sonneratia alba at The Kajhu and Meunasah Mesjid Villages, Aceh Besar

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Mai Suriani ◽  
Dietriech G Bengen ◽  
Tri Prartono
Keyword(s):  
Organic Matter ◽  
Coastal Waters ◽  
Mangrove Ecosystem ◽  
Decay Rates ◽  
Litter Production ◽  
Rhizophora Mucronata ◽  
Decomposition Rates ◽  
Ecological Functions ◽  
Sonneratia Alba ◽  
Measure Decomposition

 Production and decomposition of mangrove litter could contribute organic matter and nutrients to the coastal waters. This study was to estimate the extent to which the rehabilitated mangrove of Rhizophora mucronata and Sonneratia alba contribute organic matter. This study was conducted from November 2015 to January 2016. Litter traps were used to collect the litter production and litterbags to measure decomposition rates. The results showed that the average of litter production for Sonneratia alba and Rhizophora mucronata was 4,38 g.m-2.day-1 and 3,61 g.m-2.day-1, respectively. However, Sonneratia alba apparently showed higher decay rates compare with Rhizophora mucronata. Nutrients element (N and P) released were 321,2 kg.ha-1.years-1 and 47,45 kg.ha-1.years-1 for Sonneratia alba; and 131,4 kg.ha-1.years-1 and 13,14 kg.ha-1.years-1 for Rhizophora mucronata. Overall, this study indicated that the mangrove rehabilitation in the area study contributed insignificantly carbon restocking the affected area, although it was able to provide ecological functions of this mangrove ecosystem.

scholarly journals ANALISIS PRODUKSI SERASAH MANGROVE DI PANTAI MANG KALOK KABUPATEN BANGKA

2019 ◽  
Vol 4 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Arthur Muhammad Farhaby ◽  
Arinda Unigraha Utama
Keyword(s):  
Organic Matter ◽  
Leaf Litter ◽  
Environmental Parameters ◽  
Mangrove Ecosystem ◽  
Litter Production ◽  
Total Production ◽  
Rhizophora Mucronata ◽  
Whole Plant ◽  
Mechanical Factors ◽  
Ceriops Decandra

Ekositem mangrove merupakan ekosistem pesisir yang memiliki peran dan fungsi ekologis penting dalam menunjang sumber daya perairan dan perikanan. Keberadaan ekosistem mangrove yang lestari dan sehat tidak dapat dipisahkan oleh suplai kandungan bahan organik yang berasal dari serasah mangrove. Serasah merupakan guguran struktur vegetatif dan reproduktif yang disebabkan oleh faktor ketuaan, stress oleh faktor mekanik, ataupun kombinasi dari keduanya dan kematian serta kerusakan dari keseluruhan tumbuhan oleh iklim (hujan dan angin). Tujuan dari penelitian ini adalah untuk mengetahui produksi serasah daun mangrove, membandingkan produksi serasah beberap jenis mangrove yang dominan terdapat di Pantai Mang Kalok, serta mengetahui nilai parameter lingkungan yang berkaitan dengan serasah. Penelitan ini dilaksanakan pada bulan Januari-Maret 2018 bertempat di Pantai Mang Kalok, Kecamatan Sungailiat, Kabupaten Bangka. Metode yang umum digunakan untuk pengambilan produksi serasah adalah metode litter-trap (Jaring penampung serasah). Produksi serasah daun mangrove di Pantai Mang Kalok lebih banyak dihasilkan dari jenis Ceriops decandra dengan massa 185,7gr/m2/30hari dibandingkan dengan jenis Rhizophora mucronata yang hanya memproduksi 119,6gr/m2/30hari. Adapun untuk total produksi serasah daun mangrove di Pantai Mang Kalok adalah 305,3 gr/m2/30hari atau 10,17 gr/m2/hari. Sedangkan parameter lingkungan menujukan kondisi perairan Pantai Mang Kalok masih baik dan dapat mendukung proses penyerapan bahan organik dari serasah daun mangrove.ANALYSYS OF MANGROVE LITTER PRODUCTION ON MANG KALOK BEACH, BANGKA REGENCY. The mangrove ecosystem is a coastal ecosystem that has important ecological roles and functions in supporting marine resources and fisheries. The existence of a sustainable and healthy mangrove ecosystem cannot be separated by the supply of organic matter from mangrove litter. Litter is vegetative and reproductive structures avalanches caused by the factor of aging, stress by mechanical factors, or a combination of both and the death and destruction of the whole plant by the climate (rain and wind). The purpose of this study was to determine the production of mangrove leaf litter, compare the production of litter of several dominant types of mangrove found in Mang Kalok Beach, and to determine the value of environmental parameters related to litter. Research was conducted in January until March 2018 in Mang Kalok Beach, District Sungailiat, Bangka. A common method used for making the production of litter is litter-trap method (Net container litter). The production of mangrove leaf litter in Mang Kalok Beach is more produced from the type Ceriops decandra with a mass of 185.7gr / m2 / 30 days compared to the type of Rhizophora mucronata which only produces 119.6gr / m2 / 30 days. The total production of mangrove leaf litter at Mang Kalok Beach is 305.3 gr / m2 / 30 days or 10.17 gr / m2 / day. While the environmental parameters show that the condition of Mang Kalok Beach is still good and can support the process of absorption of organic matter from mangrove leaf litter.

scholarly journals ORGANIC CARBON DYNAMICS IN GRASSLAND SOILS. 1. BACKGROUND INFORMATION AND COMPUTER SIMULATION

1981 ◽  
Vol 61 (2) ◽  
pp. 185-201 ◽  
Author(s):  
J. A. VAN VEEN ◽  
E. A. PAUL
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Experimental Studies ◽  
Decay Rates ◽  
Background Information ◽  
Plant Residues ◽  
Decomposition Rates ◽  
Straw Decomposition ◽  
Soil Biomass ◽  
The World

The decomposition rates of 14C-labelled plant residues in different parts of the world were characterized and mathematically simulated. The easily decomposable materials, cellulose and hemicellulose, were described as being decomposed directly by the soil biomass; the lignin fraction of aboveground residues and the resistant portion of the roots entered a decomposable native soil organic matter. Here it could be decomposed by the soil biomass or react with other soil constituents in the formation of more recalcitrant soil organic matter. The transformation rates were considered to be independent of biomass size (first–order). Data from 14C plant residue incorporation studies which yielded net decomposition rates of added materials and from carbon dating of the recalcitrant soil organic matter were transformed to gross decomposition rate constants for three soil depths. The model adequately described soil organic matter transformations under native grassland and the effect of cultivation on organic matter levels. Correction for microbial growth and moisture and temperature variations showed that the rate of wheat straw decomposition, based on a full year in the field in southern Saskatchewan, was 0.05 that under optimal laboratory conditions. The relative decay rates for plant residues during the summer months of the North American Great Plains was 0.1 times that of the laboratory. Comparison with data from other parts of the world showed an annual relative rate of 0.12 for straw decomposition in England, whereas gross decomposition rates in Nigeria were 0.5 those of laboratory rates. Both the decomposable and recalcitrant organic matter were found to be affected by the extent of physical protection within the soil. The extent of protection was simulated and compared to data from experimental studies on the persistence of 14C-labelled amino acids in soil. The extent of protection influenced the steady-state levels of soil carbon upon cultivation more than did the original decomposition rates of the plant residues.

scholarly journals Produksi Serasah Musiman pada Berbagai Spesies Mangrove di Pesisir Kabupaten Muna Barat, Sulawesi Tenggara

2020 ◽  
Vol 25 (3) ◽  
pp. 323-333
Author(s):  
Rahman Rahman ◽  
Yusli Wardiatno ◽  
Fredinan Yulianda ◽  
Iman Rusmana
Keyword(s):  
Leaf Litter ◽  
Mangrove Ecosystem ◽  
Litter Production ◽  
Bruguiera Gymnorrhiza ◽  
Rhizophora Stylosa ◽  
Rhizophora Apiculata ◽  
Sonneratia Alba ◽  
Wet Weight ◽  
Bruguiera Cylindrica ◽  
Leaf Litter Production

Mangrove litter production is important in the displacement of organic matter from mangrove vegetation to water such as in the coast of West Muna Regency. However, one factor influencing it is the frequency of rainfall. This research, therefore, aims to determine the influence of the frequency of rainfall in mangrove ecosystem by obtaining data through the fractional wet weight. The results showed that the biomass fraction with the largest amount were Rhizophora mucronata, Rhizophora apiculata, and Sonneratia alba with of 31.59; 31.07; and 30.96%, respectively, while the lowest was Rhizophora stylosa, Bruguiera cylindrica, and Bruguiera gymnorrhiza with of 30.07; 30.10; and 31.95%, respectively. The species with the largest leaf litter production was Bruguiera cylindrica, with of 1.72 g.m-2.day-1 which occurred in April and the lowest was Rhizophora apiculata, 0.24 g.m-2.day-1 in August. The species with the largest leaf litter production was Bruguiera cylindrica, 1.96 g.m-2.day-1 which occurred in May and the lowest was Sonneratia alba, 0.29 g.m-2.day-1 in August. In addition, the species with the largest fruit litter production was Rhizophora apiculata, 1.76 g.m-2.day-1 in April and the lowest was Sonneratia alba, 0.32 g.m-2.day-1 in September. The total litter production was 18,75 g.m-2.day-1 consisted of 6,69 g.m2.day-1 leaf litter, 6,54 g.m-2.day-1 branch litter, and 5,52 g.m-2.day-1 fruit litter. The higher the frequency of the rain, the greater the litter production.   Keywords: biomass fraction, seasonal litter production, West Muna Regency

scholarly journals Identification of Physical Characteristics and the Change of Mangrove Region in Coastal Southern Part of Padang City, West Sumatra - Indonesia

2019 ◽  
Vol 3 (1) ◽  
pp. 87-93
Author(s):  
Triyatno Yatno Yatno ◽  
Febriandi Febriandi ◽  
Aprizon Putra ◽  
Eni Kamal
Keyword(s):  
Physical Condition ◽  
Field Survey ◽  
Coastal Region ◽  
Mangrove Ecosystem ◽  
Rhizophora Mucronata ◽  
Mangrove Area ◽  
Rhizophora Apiculata ◽  
Sonneratia Alba ◽  
West Sumatra ◽  
Multi Temporal

The research about the identification of mangrove physical condition and the change of mangrove area has aims are knowing of mangrove physical condition and the change of mangrove area in the coastal region southern part of Padang city. The method used in this research is the field survey and multi-temporal satellite imagery analysis in 2001 and 2018 year. Based on the field survey at the date of August 18, 2017 generally the mangrove that found in research location i.e Rhizophora Apiculata, Rhizophora mucronata, Sonneratia alba, and Nypa. The spatial distribution of the mangrove ecosystem is dependent on the ecological conditions of the area as reflected by the types of mangrove vegetation that grows and develops in the research location. A decrease in mangrove area that occurred between of 2001 to the 2017 years i.e in the coastal region of Bungus bay i.e 5.54 ha, where the decrease in mangrove area occurred because some mangrove plants were cut down and made the settlement land, while in the region of Sungai Pisang bay happen to increase in mangrove area i.e 36.12 ha, where the increase in mangrove area occurred because of the region obstructed by big waves of the sea (protected small the islands).

scholarly journals Profile of Mangrove Ecosystem in Bahoi Village North Minahasa Regency

2016 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Audy M. H. Dien ◽  
Unstain N. W. J. Rembet ◽  
Adnan S. Wantasen
Keyword(s):  
Mangrove Forest ◽  
Local Community ◽  
Mangrove Ecosystem ◽  
Ecological Condition ◽  
Living Environment ◽  
Total Density ◽  
Rhizophora Mucronata ◽  
Bruguiera Gymnorrhiza ◽  
Rhizophora Apiculata ◽  
Sonneratia Alba

This study was carried out in mangrove forest of Bahoi, Likupang district, North Minahasa regency. It was aimed at knowing the ecological condition of the mangrove forest. Study stations were selected by determining representatives from each zonation and site condition. Results showed that mangrove species in Bahoi was dominated by Rhizophora mucronata, R. apiculata, Bruguiera gymnorrhiza, B. cylindrical, and Sonneratia alba, with the highest density in station 1 shown by Rhizophora apiculata, 0.65 ind/m2, then station 2 and 3 by  R. Mucronata, 0.93 and 0,63 ind/m2, respectively.  The highest total density was recorded in station 2, 1.85 ind/40 m2, then station 1, 1.78 ind/40 m2, and station 3, 1.35 ind/40 m2, respectively. As conclusion, the ecological condition of mangrove ecosystem in Bahoi was categorized as good, and aware to be beneficial for the local community in ecological function as abrasion prevention and living environment of the aquatic biota and in economic function from ecotourism aspect, so that it was right to be managed in the form of ecotourism management. Keywords : Mangrove,  Profile, Bahoi Village ABSTRAK Penelitian ini dilaksanakan di kawasan mangrove desa Bahoi, Kecamatan Likupang, Kabupaten Minahasa Utara.  Tujuan penelitian, untuk mengetahui kondisi ekologis ekosistem mangrove. Penentuan lokasi stasiun pengamatan dilakukan dengan menentukan perwakilan dari setiap zonasi dan kondisi lokasi sampling. Hasil penelitian menunjukkan bahwa komposisi jenis mangrove di desa Bahoi didominasi oleh Rhizophora mucronata, R. apiculata, Bruguiera gymnorrhiza, B. cylindrical, dan Sonneratia alba, dengan kerapatan jenis tertinggi di stasiun 1 diperlihatkan oleh  Rhizophora apiculata (0,65 ind/m2), kemudian pada stasiun 2 dan 3 oleh  R. mucronata (0,93; 0,63 ind/m2).  Kerapatan total tertinggi ditemukan pada stasiun 2, 1.85 ind/40 m2, diikuti oleh stasiun 1 (1.78 ind/40 m2), dan stasiun 3 (1.35 ind/40 m2). Sebagai kesimpulan, kondisi ekologi ekosistem mangrove di Desa Bahoi dikategorikan baik, dan  disadari bermanfaat bagi masyarakat dalam fungsi ekologis sebagai pencegah abrasi dan  tempat hidup biota perairan, serta fungsi ekonomisnya dalam aspek ekowisata, sehingga tepat untuk dikelola dengan bentuk pengelolaan ekowisata.   1 Staf Dinas Kelautan dan Perikanan Provinsi Sulawesi Utara 2 Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan Unsrat

scholarly journals Profil Ekosistem Mangrove Di Desa BAHOI Kabupaten Minahasa Utara (Profile of Mangrove Ecosystem in Bahoi Village North Minahasa Regency)

2016 ◽  
Vol 4 (1) ◽  
pp. 112
Author(s):  
Audy M. H. Dien ◽  
Unstain N. W. J. Rembet ◽  
Adnan S. Wantasen
Keyword(s):  
Mangrove Forest ◽  
Local Community ◽  
Mangrove Ecosystem ◽  
Ecological Condition ◽  
Living Environment ◽  
Total Density ◽  
Rhizophora Mucronata ◽  
Bruguiera Gymnorrhiza ◽  
Rhizophora Apiculata ◽  
Sonneratia Alba

This study was carried out in mangrove forest of Bahoi, Likupang district, North Minahasa regency. It was aimed at knowing the ecological condition of the mangrove forest. Study stations were selected by determining representatives from each zonation and site condition. Results showed that mangrove species in Bahoi was dominated by Rhizophora mucronata, R. apiculata, Bruguiera gymnorrhiza, B. cylindrical, and Sonneratia alba, with the highest density in station 1 shown by Rhizophora apiculata, 0.65 ind/m2, then station 2 and 3 by  R. Mucronata, 0.93 and 0,63 ind/m2, respectively.  The highest total density was recorded in station 2, 1.85 ind/40 m2, then station 1, 1.78 ind/40 m2, and station 3, 1.35 ind/40 m2, respectively. As conclusion, the ecological condition of mangrove ecosystem in Bahoi was categorized as good, and aware to be beneficial for the local community in ecological function as abrasion prevention and living environment of the aquatic biota and in economic function from ecotourism aspect, so that it was right to be managed in the form of ecotourism management. Keywords : Mangrove,  Profile, Bahoi Village ABSTRAK Penelitian ini dilaksanakan di kawasan mangrove desa Bahoi, Kecamatan Likupang, Kabupaten Minahasa Utara.  Tujuan penelitian, untuk mengetahui kondisi ekologis ekosistem mangrove. Penentuan lokasi stasiun pengamatan dilakukan dengan menentukan perwakilan dari setiap zonasi dan kondisi lokasi sampling. Hasil penelitian menunjukkan bahwa komposisi jenis mangrove di desa Bahoi didominasi oleh Rhizophora mucronata, R. apiculata, Bruguiera gymnorrhiza, B. cylindrical, dan Sonneratia alba, dengan kerapatan jenis tertinggi di stasiun 1 diperlihatkan oleh  Rhizophora apiculata (0,65 ind/m2), kemudian pada stasiun 2 dan 3 oleh  R. mucronata (0,93; 0,63 ind/m2).  Kerapatan total tertinggi ditemukan pada stasiun 2, 1.85 ind/40 m2, diikuti oleh stasiun 1 (1.78 ind/40 m2), dan stasiun 3 (1.35 ind/40 m2). Sebagai kesimpulan, kondisi ekologi ekosistem mangrove di Desa Bahoi dikategorikan baik, dan  disadari bermanfaat bagi masyarakat dalam fungsi ekologis sebagai pencegah abrasi dan  tempat hidup biota perairan, serta fungsi ekonomisnya dalam aspek ekowisata, sehingga tepat untuk dikelola dengan bentuk pengelolaan ekowisata.   1 Staf Dinas Kelautan dan Perikanan Provinsi Sulawesi Utara 2 Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan Unsrat

scholarly journals Kelimpahan dan Keanekaragaman Polychaeta pada jenis mangrove yang berbeda di Tahura Ngurah Rai

2017 ◽  
Vol 4 (2) ◽  
pp. 171
Author(s):  
Luh Pt Priyandayani ◽  
I Gede Hendrawan ◽  
Widiastuti Karim
Keyword(s):  
Organic Material ◽  
Diversity Index ◽  
Wiener Index ◽  
Mangrove Ecosystem ◽  
Benthic Macrofauna ◽  
Rhizophora Mucronata ◽  
Sonneratia Alba ◽  
Abundance And Diversity ◽  
The Stability ◽  
Number Of Individuals

Mangrove at Tahura Ngurah Rai Bali contributes the organic material into environment. Polychaeta is one of the main benthic macrofauna that has important role in accumulating organic material to mangrove ecosystem. The purpose of this research is to explain the abundance and diversity of Polychaeta such as Rhizophora mucronata, mix mangrove and Sonneratia alba at Tahura Ngurah Rai. The sampling of Polychaeta using corers with diameter 17 cm and height 18 cm those sink in the substrate. The abundance was analyzed by the Krebs and diversity was analyzed by Shannon Wiener index. There were five genus of Polychaeta, such as Heteromastus, Marphysa, Laeonereis, Nereis, and Paranaitis. The highest abundance of Polychaeta was found in mixed stations (432 ± 57,37 ind/m2), and the lowest abundance was in R. mucronata (414 ± 79,93 ind/m2). The abundance of Polychaeta in the three stations did not differ significantly because it was influenced by the dominant substrate of sandy clay. The highest Polychaeta diversity was found in S. alba (0,704), followed by the mixed station (0,642), and the lowest was in R. mucronata. The value of Polychaeta diversity on the three stations differed significantly because of the comparison between the type and total number of individuals in each station that varied. The Polychaeta diversity index in the three stations is low, while the Polychaeta abundance value in each station is quite abundant. The result showed that the stability of the Polychaeta community in the mangrove ecosystem is unstable.

scholarly journals KETERKAITAN KARAKTERISTIK HABITAT DENGAN KEPADATAN KEPITING BAKAU PADA EKOSISTEM MANGROVE DESA EVU KECAMATAN HOAT SOARBAY KABUPATEN MALUKU TENGGARA

2019 ◽  
Vol 15 (2) ◽  
pp. 58-68
Author(s):  
Muhammad Yunus ◽  
Laura Siahainenia
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Fine Sand ◽  
Component Analysis ◽  
Mangrove Ecosystem ◽  
Habitat Characteristics ◽  
Scylla Serrata ◽  
Rhizophora Mucronata ◽  
Sonneratia Alba ◽  
Mud Crabs

The study was conducted in the mangrove ecosystem of Evu Village, Hoat Soarbay District, Southeast Maluku Regency, from March to May 2018. The study aimed to analyze the relation of habitat characteristics with the density of the mud crabs. Analysis of habitat characteristics includes parameters of temperature, salinity, pH, DO, mangrove density and substrate. Mangrove crab sampling using proporsive sampling method at nine stations with different characteristics. The relation of the mud crabs density and its habitat characteristics using the Principal Component Analysis method. In general, the physical, chemical and biological parameters of the mangrove ecosystem of Evu Village are still in good condition and can be tolerated by mud crabs. The density of mud crabs in mangrove ecosystem is relatively high. Scylla olivacea was highly distributed at zones with Xylocarpus sp. Rhizophora mucronata and Bruguiera sp.; high pH, ​​DO, and salinity values; and fine sand and coarse sand of substrate stucture. Whereas S. serrata was highly distributed at zones with Sonneratia alba, Rhizophora mucronata and Bruguiera sp., and fine sand and mud as substrate structure. ABSTRAK Penelitian dilakukan di ekosistem mangrove Desa Evu Kecamatan Hoat Soarbay Kabupaten Maluku Tenggara, sejak Maret-Mei 2018. Penelitian bertujuan menganalisis keterkaitan karakteristik habitat dengan kepadatan kepiting bakau pada ekosistem mangrove Desa Evu. Analisis karakteristik habitat meliputi parameter suhu, salinitas, pH, DO, kerapatan mangrove dan presentasi fraksi substrat. Sampling kepiting bakau untuk menganalisis kepadatan menggunakan metode proporsive sampling pada 9 (Sembilan) stasiun dengan karakter habitat yang berbeda. Analisis keterkaitan kepadatan kepiting bakau pada tiap stasiun menggunakan metode Analisis Komponen Utama (Principal Component Analysis). Secara umum nilai parameter fisik, kimiawi  dan biologis ekosistem mangrove Desa Evu masih dalam kondisi baik dan dapat ditolelir oleh kepiting bakau. Kepadatan kepiting bakau pada ekosistem mangrove Desa Evu tergolong tinggi, baik berdasarkan spesies maupun jenis kelamin. Scylla olivacea berdistribusi tinggi zona yang ditumbuhi mangrove mangrove  Xylocarpus sp. Rhizophora mucronata dan Bruguiera sp. dengan nilai pH, DO, dan salinitas yang tinggi; serta fraksi substrat pasir halus dan pasir kasar. Sedangkan S. serrata berdistribusi tinggi zona yang ditumbuhi mangrove Sonneratia alba Rhizophora mucronata dan Bruguiera sp., serta bersubstrat dasar pasir halus dan lumpur. Kata Kunci: Scylla serrata, mangrove, kepadatan, Hoat Soarbay, Evu

Macrophyte-derived detritus in shallow coastal waters contributes to suspended particulate organic matter and increases growth rates of Mytilus edulis

2020 ◽  
Vol 644 ◽  
pp. 91-103
Author(s):  
D Bearham ◽  
MA Vanderklift ◽  
RA Downie ◽  
DP Thomson ◽  
LA Clementson
Keyword(s):  
Organic Matter ◽  
Mytilus Edulis ◽  
Particulate Organic Matter ◽  
Coastal Waters ◽  
Gill Tissue ◽  
Suspension Feeder ◽  
Food Sources ◽  
Suspension Feeders ◽  
Blue Mussels ◽  
Suspended Particulate

Benthic suspension feeders, such as bivalves, potentially have several different food sources, including plankton and resuspended detritus of benthic origin. We hypothesised that suspension feeders are likely to feed on detritus if it is present. This inference would be further strengthened if there was a correlation between δ13C of suspension feeder tissue and δ13C of particulate organic matter (POM). Since detritus is characterised by high particulate organic matter (POC):chl a ratios, we would also predict a positive correlation between POM δ13C and POC:chl a. We hypothesised that increasing depth and greater distance from shore would produce a greater nutritional reliance by experimentally transplanted blue mussels Mytilus edulis on plankton rather than macrophyte-derived detritus. After deployments of 3 mo duration in 2 different years at depths from 3 to 40 m, M. edulis sizes were positively correlated with POM concentrations. POC:chl a ratios and δ13C of POM and M. edulis gill tissue decreased with increasing depth (and greater distance from shore). δ13C of POM was correlated with δ13C of M. edulis. Our results suggest that detritus comprised a large proportion of POM at shallow depths (<15 m), that M. edulis ingested and assimilated carbon in proportion to its availability in POM, and that growth of M. edulis was higher where detritus was present and POM concentrations were higher.

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