Comparison of flooding-tolerance in four mangrove species in a diurnal tidal zone in the Beibu Gulf

Carbon and nitrogen contents and their isotopic components and AMS radiocarbon dating ages were measured for 57 coastal sediments from Weizhou Island to analyze the distribution of total inorganic carbon (TIC) and its carbon and oxygen isotopic components (δ13Ccarb and δ18Ocarb), total organic carbon (TOC) and total nitrogen (TN) contents and their stable isotopic components (δ13CTOC and δ15NTN) and environmental significance. The results showed that the oldest age of coastal sediments on Weizhou Island was 2750 cal. a BP, and the average TIC contents of A1, A2, B1, C1, and D1 in the intertidal zone were all greater than 5%, where δ13Ccarb and δ18Ocarb were enriched, while the TIC contents in A3, C2, and D2 of the supra-tidal zone were low, where δ13Ccarb and δ18Ocarb were depleted. Moreover, TIC decreased sharply from the estuary to upstream region in the C1-C2 section. The average C/N ratio was 7.02, and δ13CTOC and δ15NTN were between -14.96‰~-27.26‰ and -14.38‰~4.12‰, respectively. These measurements indicated that the TIC in coastal sediments mainly came from seawater. A1, A2, and B1 in the northern intertidal zone exhibited organic terrestrial signals because of C3 and C4 plant inputs, which proved that the important source of the northern coast of Weizhou Island came from the island. The lacustrine facies deposits were mainly distributed in the upper reaches of the river, the northern coastline was rapidly advancing toward the sea, and part of the southwestern coastal sediments rapidly accumulated to the shore under the influence of a storm surge. The relative sea level of the Weizhou Island area has continuously declined at a rate of approximately 2.07 mm/a, using beach rock as a marker, since the Holocene.

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Mangrove diversity and community structure of Mimika District, Papua, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d220857 ◽

2021 ◽

Vol 22 (8) ◽

Author(s):

Gesang Setyadi ◽

RUDHI PRIBADI ◽

DIAH PERMATA WIJAYANTI ◽

DENNY NUGROHO SUGIANTO

Keyword(s):

Community Structure ◽

Basal Area ◽

Avicennia Marina ◽

Diversity Indices ◽

Canopy Height ◽

Bruguiera Gymnorrhiza ◽

Mangrove Species ◽

Tidal Zone ◽

Nypa Fruticans ◽

Rhizophora Apiculata

Abstract. Setyadi G, Pribadi R, Wijayanti DP, Sugianto DN. 2021. Mangrove diversity and community structure of Mimika District, Papua, Indonesia. Biodiversitas 22: 3562-3571. Despite being one the largest mangrove forest in the world, there are few studies on mangrove diversity and community structure in Mimika, Papua Province. The study collected data from 4 estuaries of Mimika Region, i.e. Kamora, Tipuka, Ajkwa and Minajerwi. Mangrove species, tree diameter at breast height and canopy height data were collected in 10 m x 10 m plot with three replicates for distance, specifically 0, 250, and 500m perpendicular to the riverbank. This study found 66 mangroves species consisting of 20 major, 10 minor, and 36 associate mangrove species. Their density ranged from 577-1,345 trees ha-1 with diversity Shannon-Weiner diversity indices (H’) ranging from 0.62-1.19 and Evenness Index (J’) ranging from 0.09-0.18. The canopy height of the mangrove trees was ranged from 9-42.5 m. The highest density species was Rhizophora apiculata (333 ha-1) followed by Avicennia marina, Bruguiera gymnorrhiza, and Camptostemon schultzii, while B. parviflora, S. alba, and X. granatum were the least dominant. Regarding basal area, R. apiculata and B. gymnorrhiza were the highest with medians of 7,853 cm2 ha-1 and 5,201 cm2 ha-1 respectively. In the low tidal zone area, mangrove was dominated by A. marina, Sonneratia alba and R. mucronata. Medium low to medium high tidal zones were dominated by B. gymnorrhiza, R. apiculata, and B. parviflora. The high tidal zone was more dominated by Nypa fruticans.

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Pengaruh Penambahan Kitosan Terhadap Pertumbuhan Rhizopora mucronata dengan Konsentrasi Berbeda di Tambak Desa Mangunharjo, Semarang

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v1i1.241 ◽

2012 ◽

Vol 1 (1) ◽

pp. 33-37

Author(s):

Ayuk Yasinta

Keyword(s):

Fish Farming ◽

Average Height ◽

Rhizophora Mucronata ◽

Treatment Results ◽

Mangrove Species ◽

Tidal Zone ◽

Average Growth ◽

Chitosan Concentration ◽

Mangrove Seedlings ◽

Determine Effect

Rhizophora mucronata adalah salah satu species mangrove, species ini banyak ditanam untuk menangulangi abrasi. Mangrove adalah vegetasi hutan yang tumbuh diantara garis pasang surut tumbuhan yang hidup diantara laut dan daratan. Metode penelitian yang digunakan adalah metode eksperimental. Penelitian ini dilaksanakan pada bulan Desember 2011 sampai Maret 2012. Lokasi penelitian adalah pematang antara tambak budidaya ikan dan pembibitan mangrove. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemberian kitosan terhadap pertumbuhan Rhizophora mucronata sehingga dapat digunakan untuk mendapatkan konsentrasi terbaik sebagai acuan pembibitan. Rata-rata pertumbuhan tinggi pucuk Rhizopora mucronata (cm) berdasarkan nilai R2 terbesar yaitu 0,998 dan pertambahan panjang dan lebar bibit Rhizopora mucronata (cm) yang terbesar 0,895 pada konsentrasi 10 ppm. Uji t dilakukan untuk melihat pengaruh penambahan kitosan terhadap pertumbuhan dengan membandingkan kontrol dengan perlakuan, hasilnya F hitung < F tabel. Perbandingan kontrol dengan konsentrasi 10 ppm F hitung -3,822) < F tabel 1,782 kontrol dengan konsentrasi 15 ppm F hitung -2,779) < F tabel 1,782 kontrol dengan konsentrasi 33 ppm F hitung -3,223) < F tabel 1,782. Berdasarkan analisis data diatas dapat disimpulkan bahwa tidak ada pengaruh nyata antara penambahan kitosan dengan rata-rata pertumbuhan Rhizopora mucronata, dari kesimpulan tersebut maka tidak didapatkan konsentrasi yang terbaik digunakan untuk pembibitan.Kata Kunci: Konsentrasi kitosan, Pertumbuhan, Rhizopora mucronataAbstractRhizophora mucronata is one species of mangrove, species are widely planted to overcome abrasion. Mangrove is the vegetation that grows at tidal zone that live between the sea and land. The method used in this study is an experimental method. The research were implemented on December 2011-March 2012. The purpose of this study were determine effect of chitosan addition on the growth of Rhizophora mucronata so it can be used to obtain the best concentration as a reference seedlings. Study site is the embankment of fish farming pond and mangrove seedlings. Average height growth Rhizophora mucronata shoots (cm) that is based on the largest value of R2 is 0,998 and width of seeds Rhizopora mucronata (cm) which had the largest correlation value 0.895 thing happened on the chitosan concentration of 10 ppm. T test conducted to see the effect of adding chitosan on growth by comparing control with treatment, results F hitung < F tabel. Comparison of control with a concentration of 10 ppm F hitung -3,822) < F tabel 1,782 control with a concentration of 15 ppm -2,779 < F tabel 1,782 control with a concentration of 33 ppm F hitung -3,223 < F tabel 1,782. Based on the analysis of the above data it can be concluded that there is no significant effect between the addition of chitosan with an average growth of Rhizophora mucronata, of this conclusion it is not obtained concentration best for the breed.Keywords: Concentration of chitosan, Growth, Rhizopora mucronata

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Distribution of Carbon and Nitrogen as Indictors of Environmental Significance in Coastal Sediments of Weizhou Island, Beibu Gulf

Water ◽

10.3390/w12113285 ◽

2020 ◽

Vol 12 (11) ◽

pp. 3285

Author(s):

Zhiyi Tang ◽

Chao Cao ◽

Kunxian Tang ◽

Hongshuai Qi ◽

Yuanmin Sun ◽

...

Keyword(s):

Intertidal Zone ◽

Coastal Sediments ◽

Upstream Region ◽

C3 Plants ◽

Beibu Gulf ◽

Northern Coast ◽

Environmental Significance ◽

Tidal Zone ◽

Carbon And Nitrogen ◽

Oxygen Isotopic

Carbon and nitrogen contents and their isotopic components, and AMS (Accelerator Mass Spectrometry) radiocarbon dating ages, were measured for 57 coastal sediments from Weizhou Island to analyze the distribution of total inorganic carbon (TIC) and its carbon and oxygen isotopic components (δ13Ccarb and δ18Ocarb), total organic carbon (TOC) and total nitrogen (TN) contents and their stable isotopic components (δ13CTOC and δ15NTN), and their environmental significance. The results showed that the oldest age of coastal sediments on Weizhou Island was 2750 cal. a BP (before present), and the average TIC contents of cores A1, A2, B1, C1, and D1 in the intertidal zone were all greater than 5%, where δ13Ccarb and δ18Ocarb were enriched, whereas the TIC contents in cores A3, C2, and D2 of the supra-tidal zone were low, where δ13Ccarb and δ18Ocarb were depleted. Moreover, TIC decreased sharply, 4.95% on average, to close to zero from the estuary to the upstream region in the C1-C2 section. The average C/N ratio was 7.02, and δ13CTOC and δ15NTN were between −14.96‰ and −27.26‰ and −14.38‰ and 4.12‰, respectively. These measurements indicate that the TIC in coastal sediments mainly came from seawater. Cores A1, A2, and B1 in the northern intertidal zone exhibited organic terrestrial signals because of C3 and C4 plant inputs, which indicates that the important source on the northern coast of Weizhou Island came from island land but followed the decrease in C3 plants. The lacustrine facies deposits were mainly distributed in the upper reaches of the river, the northern coastline was advancing toward the sea, and part of the southwestern coastal sediments rapidly accumulated on the shore under the influence of a storm surge. The relative sea level of the Weizhou Island area has continuously declined at a rate of approximately 2.07 mm/a, using beach rock as a marker, since the Holocene.

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Dynamic changes in leaf bulk water relations during stomatal oscillations in mangrove species. Continuous analysis using a dewpoint hygrometer

Physiologia Plantarum ◽

10.1034/j.1399-3054.1995.940316.x ◽

1995 ◽

Vol 94 (3) ◽

pp. 479-485

Author(s):

Werner B. Herppich ◽

Dieter J. von Willert

Keyword(s):

Water Relations ◽

Bulk Water ◽

Continuous Analysis ◽

Dynamic Changes ◽

Mangrove Species

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First Record of Omura’s Whale (Balaenoptera omurai) in the Beibu Gulf, China

Aquatic Mammals ◽

10.1578/am.46.3.2020.301 ◽

2020 ◽

Vol 46 (3) ◽

pp. 301-306

Author(s):

Liyuan Zhao ◽

Mingding Zhong ◽

Fuxing Wu ◽

Yufei Dai ◽

Reyilamu Aierken ◽

...

Keyword(s):

First Record ◽

Beibu Gulf

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Aspidisca beringiana sp. nov. and Simbiodisca subgen. nov. (Ciliophora, Euplotida), a symbiont of terebellid polychaetes in the Bering Sea

Zoosystematica Rossica ◽

10.31610/zsr/2009.18.2.184 ◽

2009 ◽

Vol 18 (2) ◽

pp. 184-190

Author(s):

A.W. Jankowski

Keyword(s):

Bering Sea ◽

Tidal Zone ◽

Generic Rank ◽

New Subgenus ◽

Bering Island ◽

The Bering Sea

Terebellids in tidal zone of the Bering Island bear three new symbionts - rhabdophryid suctorians, peritrichs with small rosette-like colonies and aspidiscid hypotrich with a long peristome parallel to left body margin. This is the main feature of a new subgenus of the genus Aspidisca, named Simbiodisca. It may deserve the full generic rank if the use of protargol silvering method will not reveal any upper left rudiment of the peristomal membranelles.

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