scholarly journals The effects of selective cutting on the dominance and the relative density of mangrove species in the complex of the Guaxindiba river/Engenheiro Antonio Resende channel, Rio de Janeiro

2015 ◽  
Vol 43 (1) ◽  
Author(s):  
Gabriele Paiva CHAGAS ◽  
Carlos Eduardo REZENDE ◽  
Elaine BERNINI
Keyword(s):  
Relative Density ◽  
Rio De Janeiro ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
Residential Areas ◽  
Mangrove Species ◽  
Selective Cutting ◽  
Species Dominance ◽  
Breast Height ◽  
Janeiro State

This study evaluated the effect of selective cutting on the dominance and the relative density of mangrove species in the Complex of the Guaxindiba River/Engenheiro Antonio Resende Channel, in Rio de Janeiro State, Brazil. Ten plots were demarcated along the estuary and within each plot measurements were taken of the diameter at breast height (DBH) for individuals > 2.5 cm. Measurements of selective cutting and regrowth were made for the different species. The cutting of vegetation was registered in 9 of the 10 plots analyzed and varied from 2 to 43%. 4. There was no relation between the percent of trunks cut and the proximity of residential areas. Selective cutting was found for Avicennia germinans and Laguncularia racemosa, but only L. racemosa presented regrowth. The results suggest that L. racemosa is more highly affected by selective cutting when compared to the other species, though this impact did not modify the species dominance and the relative density in the mangrove analyzed due to the high regrowth of L. racemosa. Keywords: mangrove, estuary, conservation, vegetation

scholarly journals Estrutura da vegetação em florestas de mangue do estuário do rio Paraíba do Sul, Estado do Rio de Janeiro, Brasil

2004 ◽  
Vol 18 (3) ◽  
pp. 491-502 ◽  
Author(s):  
Elaine Bernini ◽  
Carlos Eduardo Rezende
Keyword(s):  
Rio De Janeiro ◽  
Rhizophora Mangle ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
Basal Media

A estrutura da vegetação do manguezal do estuário do rio Paraíba do Sul foi analisada pelo método de parcelas, que foram distribuídas na franja e no interior da floresta em dois sítios de estudo. No geral, considerando-se os indivíduos > 1m alt., a altura média variou de 6,3 a 9,9m, o DAP médio de 7,44 a 13,4cm, a área basal média de 14,5 a 35,3m².ha-1 e a densidade média de 1.920 a 3.400 troncos.ha-1. Estes parâmetros estruturais não diferiram, significativamente, entre a franja e o interior da floresta, mas a contribuição de cada espécie variou entre as distintas zonas. Avicennia germinans (L.) Stearn. foi a espécie dominante em área basal de indivíduos vivos (60%), seguida de Rhizophora mangle L. (25%) e de Laguncularia racemosa (L.) Gaertn. (15%). Os resultados obtidos demonstraram que a área de manguezal analisada apresenta melhor desenvolvimento estrutural quando comparada a outros manguezais do litoral fluminense, tais como os encontrados nas Baías de Guanabara e Sepetiba.

scholarly journals ANALISIS STRUKTUR KOMUNITAS MANGROVE DI KAWASAN SEKITAR PT. CONCH KABUPATEN BOLAANG MONGONDOW

2020 ◽  
Vol 8 (2) ◽  
pp. 104
Author(s):  
George L Pandeirot ◽  
Antonius P Rumengan ◽  
Carolus P Paruntu ◽  
Surya Darwisito ◽  
Medy Ompi ◽  
...  
Keyword(s):  
Relative Density ◽  
Relative Frequency ◽  
Mangrove Species ◽  
Species Frequency ◽  
Breast Height ◽  
Plot Size ◽  
North Sulawesi ◽  
Relative Cover ◽  
Important Value Index ◽  
Mangrove Structure

This research was conducted for four months of April-July 2020. The purpose of this study was to determine species density, species relative density, species frequency, species relative frequency, species cover, species relative cover, index of the importance of mangrove species in the area around PT. Conch Lolak District, Bolaang Mongondow Regency, North Sulawesi Province. This research was conducted for four months of April-July 2020. The method used was a quadratic plot of 6 stations. Data collection at each station was made with a plot size of 10 × 10 m2 to measure the diameter of a tree at breast height (DBH), which has a minimum trunk circumference of 16 cm. The results showed that there were five types of mangroves, namely R. apiculata, R. mucronata, B. gymnorhiza, S. alba, and X. granatum. The highest relative density of species at station 2, namely R. mucronate 62.96%, while the lowest value at station 3, namely R. mucronata 8.77%, the highest relative frequency value at station 4, namely R. mucronata 33.33%, whereas the lowest value was at station 5, namely B. gymnorhiza 25.00%, the highest relative closure value was at station 5, namely R. mucronata 30.91%, while the lowest was at station 2, namely R. apiculata 12.88%, and the important value index the highest was at station 3, namely R. apiculata 138.09% and the lowest value was at station 5, namely X. granatum 35.05%.Kata Kunci: Mangrove, Structure in areas around PT. Conch. Conch, Rhizopora Abstrak Penelitian ini dilakukan selama 4 bulan April-Juli 2020. Tujuan penelitian ini adalah untuk mengetahui kerapatan jenis, kerapatan relatif jenis, frekuensi jenis, frekuensi relatif jenis, penutupan jenis, penutupan relatif jenis, indeks nilai penting jenis mangrove yang ada di kawasan sekitar PT. Conch Kecamatan Lolak, Kabupaten Bolaang Mongondow, Provinsi Sulawawesi Utara. Penelitian ini dilakukan selama 4 bulan April-Juli 2020. Metode yang dipakai adalah plot kuadrat sebanyak 6 stasiun. Pengambilan data pada setiap stasiun dibuat plot dengan ukuran 10 × 10 m2 untuk mengukur diameter pohon setinggi dada (DBH) yang memiliki lingkar batang minimal 16 cm. Hasil penelitian menunjukkan bahwa ada 5 jenis mangrove yaitu R. apiculata, R. mucronata, B. gymnorhiza, S. alba dan X. granatum. Kerapatan relatif jenis tertinggi pada stasiun 2, yaitu R. mucronata 62,96%, sedangkan nilai terendah pada stasiun 3, yaitu R. mucronata 8,77%, nilai Frekuensi relatif jenis tertingi pada stasiun 4, yaitu R. mucronata 33.33%, sedangkan nilai terendah pada stasiun 5, yaitu B. gymnorhiza 25.00%, nilai Penutupan relatif jenis tertinggi pada stasiun 5, yaitu R. mucronata 30,91%, sedangkan terendah pada stasiun 2, yaitu R. apiculata 12,88%, dan Indeks nilai penting tertinggi pada stasiun 3, yaitu R. apiculata 138,09% dan nilai terendah pada stasiun 5, yaitu X. granatum 35,05%.Kata Kunci: Mangrove, kawasan sekitar PT. Conch, Rhizopora  

scholarly journals Reproductive phenology and influence of abiotic variables for two mangrove species in northeastern Brazil

Rodriguésia ◽  
2021 ◽  
Vol 72 ◽  
Author(s):  
Frederico Lage-Pinto ◽  
Pedro Silva Fernando ◽  
Alan Felix Meyer Carletto ◽  
Elaine Bernini
Keyword(s):  
River Estuary ◽  
Avicennia Germinans ◽  
Northeastern Brazil ◽  
Circular Statistics ◽  
Reproductive Phenology ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Floral Buds ◽  
Abiotic Variables ◽  
Flowering Rhythm

Abstract Information on plant phenological patterns aids in understanding the structure and functioning of ecosystems and support restoration projects in degraded areas. The aim of this study was to characterize the reproductive phenology of Avicennia germinans and Laguncularia racemosa in a mangrove forest in the Mamanguape River estuary in northeastern Brazil. The characterization was performed monthly from July 2016 to June 2017. We applied circular statistics to detect seasonal trends, calculated intra-specific synchrony, and performed regressions between the reproductive phenophases and the abiotic variables. Avicennia germinans exhibits seasonal responses to floral buds, flowers at anthesis, and fruit, with one reproductive episode per year (annual pattern). Laguncularia racemosa has no seasonal response, with one reproductive episode per year for floral buds (annual pattern) and two episodes for flowers at anthesis and fruits (subannual pattern). Reproductive phenophases of A. germinans exhibited higher intra-specific synchrony than L. racemosa. We provide evidence that temperature, solar radiation and rainfall are important drivers of the flowering rhythm in both species. In conclusion, the results of this study showed that the species exhibited different phenological responses, even though they were subjected to the same abiotic conditions.

scholarly journals THE RECOVERY OF A DEGRADED MANGROVE IN CEARÁ THROUGH THE PRODUCTION OF Laguncularia racemosa (L.) C.F. Gaertn. (Combretaceae) AND Avicennia sp. Stapf ex Ridl (Acanthaceae) SEEDLINGS

2016 ◽  
Vol 40 (3) ◽  
pp. 377-385 ◽  
Author(s):  
Amanda Lídia de Sousa Paula ◽  
Brena Késia de Sousa Lima ◽  
Rafaela Camargo Maia
Keyword(s):  
Survival Rates ◽  
River Estuary ◽  
Mangrove Ecosystem ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
Western Coast ◽  
Mangrove Species ◽  
Growth And Survival ◽  
Conocarpus Erectus

ABSTRACT The mangrove ecosystem performs several natural functions of great ecological and economic importance. This study provided procedures for the recovery of mangrove ecosystems through the characterization of vegetation and zonation patterns and evaluation of growth and survival rates of mangrove species in an experimental plantation. The study was performed in the Acaraú River estuary mangrove on the western coast of Ceará State. The characterization of vegetation was conducted with the use of multiple plots and transects replication. Plants were identified at the species level, and their heights and CBH (circumference at breast height) were measured in each plot. Seedlings of the dominant mangrove species were produced using estuarine propagules. Five mangrove species were sampled: Rhizophora mangle, Avicennia germinans, Avicennia schaueriana, Laguncularia racemosa, and Conocarpus erectus. L. racemosa was the most dominant and frequent species, followed by A. germinas. A total of 111 L. racemosa and 102 Avicennia sp seedlings of were produced. Seedlings were viable for replanting within two months. The results of the analysis of vegetation structure and production and growth of seedlings are encouraging and demonstrate that revegetation is not only possible but also successful in this significantly deforested and degraded mangrove.

scholarly journals A preliminary investigation of endophytic fungal diversity at Hope, East Coast Demerara, Guyana

2021 ◽  
Vol 17 (2) ◽  
pp. 044-048
Author(s):  
Kimberly Craig ◽  
Abdullah Ansari
Keyword(s):  
Fungal Diversity ◽  
East Coast ◽  
Preliminary Investigation ◽  
Fungal Endophytes ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Red Mangrove ◽  
Fungal Isolates ◽  
White Mangrove

Foliar endophytic fungi spend a part of their life cycle on the leaves of plants. They may demonstrate no apparent symptoms but may also cause disease at a later time in the plant’s life. Studies investigating foliar fungal endophytes of mangroves are limited. Therefore, the purpose of this study was to investigate the foliar fungal endophytes present on the leaves of three mangrove species: namely Red mangrove (Rhizophora mangle), Black mangrove (Avicennia germinans) and White mangrove (Laguncularia racemosa). The study site was an area located at Hope, East Coast Demerara, and South America, Guyana. Out of sixty (60) leaf samples that were prepared, fourteen (14) fungal isolates were identified. Most of the fungi isolated in the study were found to be Hyphomycetes (Aspergillus, Fusarium, Penicillium, Alternaria, Cladosporium and Curvularia) while the others were Zygomorphic (Mucor and Rhizopus). The ANOVA calculations for the isolates from the three mangrove species were found to not be statistically significant. R mangle was the preferred host out of the three (3) species. The findings of this study confirm that mangroves have rich endophytic diversity and demonstrate rich research and biochemical potential.

Brazilian peppertree and mangrove species response to foliar-applied novel auxin-type herbicides

2020 ◽  
Vol 13 (2) ◽  
pp. 102-107
Author(s):  
Stephen F. Enloe ◽  
James K. Leary ◽  
Candice M. Prince ◽  
Benjamin P. Sperry ◽  
Dwight K. Lauer
Keyword(s):  
Complex Structure ◽  
Avicennia Germinans ◽  
Freshwater Wetlands ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Invasive Shrub ◽  
Species Response ◽  
Red Mangrove ◽  
Highly Sensitive ◽  
Geographic Remoteness

AbstractBrazilian peppertree (Schinus terebinthifolia Raddi) is an invasive shrub that is problematic in both freshwater wetlands and brackish mangrove communities. The complex structure, geographic remoteness, and general herbicide sensitivity of mangrove systems have resulted in great technical challenges for managers attempting selective S. terebinthifolia control. Recent advances in auxin herbicide technologies warrant herbicide screening to address this growing problem. Therefore, greenhouse experiments were conducted in 2018 and 2019 to evaluate four non-target mangrove species and S. terebinthifolia response to the three herbicides: aminocyclopyrachlor, aminopyralid, and florpyrauxifen-benyzl. Aminocyclopyrachlor controlled S. terebinthifolia, but was highly injurious to black mangrove [Avicennia germinans (L.) L.], red mangrove (Rhizophora mangle L.), white mangrove [Laguncularia racemosa (L.) C.F. Gaertn.], and buttonwood mangrove (Conocarpus erectus L.). Aminopyralid also controlled S. terebinthifolia but its impact varied across mangrove species. Laguncularia racemosa and C. erectus were highly sensitive to aminopyralid, R. mangle exhibited dose-dependent tolerance, and A. germinans was highly tolerant. Florpyrauxifen-benzyl failed to control S. terebinthifolia and resulted in severe injury to all four mangrove species. These results indicate differential responses to newer auxins in both the target response and non-target plant community of interest. The efficacy of aminopyralid on S. terebinthifolia, coupled with its selectivity on A. germinans warrants further testing.

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