scholarly journals Pollinator-mediated competition between two co-flowering Neotropical mangrove species, Avicennia germinans (Avicenniaceae) and Laguncularia racemosa (Combretaceae)

2012 ◽  
Vol 111 (2) ◽  
pp. 207-214 ◽  
Author(s):  
C. L. Landry
Keyword(s):  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
Mangrove Species

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 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.

scholarly journals Forest Structure and Projections of Avicennia germinans (L.) L. at Three Levels of Perturbation in a Southwestern Gulf of Mexico Mangrove

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 989
Author(s):  
Basáñez-Muñoz Agustín de Jesús ◽  
Jordán-Garza Adán Guillermo ◽  
Serrano Arturo
Keyword(s):  
Size Structure ◽  
Transition Probabilities ◽  
High Sensitivity ◽  
Avicennia Germinans ◽  
Mangrove Forests ◽  
Mangrove Species ◽  
Adult Trees ◽  
Mangrove Dynamics ◽  
Projection Matrices ◽  
Partial Tree

Mangrove forests have declined worldwide and understanding the key drivers of regeneration at different perturbation levels can help manage and preserve these critical ecosystems. For example, the Ramsar site # 1602, located at the Tampamachoco lagoon, Veracruz, México, consists of a dense forest of medium-sized trees composed of three mangrove species. Due to several human activities, including the construction of a power plant around the 1990s, an area of approximately 2.3 km2 has suffered differential levels of perturbation: complete mortality, partial tree loss (divided into two sections: main and isolated patch), and apparently undisturbed sites. The number and size of trees, from seedlings to adults, were measured using transects and quadrats. With a matrix of the abundance of trees by size categories and species, an ordination (nMDS) showed three distinct groups corresponding to the degree of perturbation. Projection matrices based on the size structure of Avicennia germinans showed transition probabilities that varied according to perturbation levels. Lambda showed growing populations except on the zone that showed partial tree loss; a relatively high abundance of seedlings is not enough to ensure stable mangrove dynamics or start regeneration; and the survival of young trees and adult trees showed high sensitivity.

scholarly journals Validación y aplicación de un modelo de restauración de manglar basado en individuos para tres especies en la Ciénaga Grande de Santa Marta

Caldasia ◽  
2016 ◽  
Vol 38 (2) ◽  
pp. 285 ◽  
Author(s):  
Jenny Alexandra Rodríguez-Rodríguez ◽  
José Ernesto Mancera-Pineda ◽  
Juan Manuel Rodríguez-P.
Keyword(s):  
Rhizophora Mangle ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
El Sistema

En la década de los años 90 los manglares de la Ciénaga Grande de Santa Marta (CGSM) murieron masivamente por los altos niveles de salinidad en el suelo. Este hecho estimuló la reapertura de cinco canales naturales para reducir la salinidad y mejorar las condiciones del bosque (Proyecto PROCIENAGA). Con base en esta experiencia, en 1999 un modelo basado en individuos (FORMAN) fue desarrollado para simular trayectorias de restauración del bosque; sin embargo, este modelo fue restringido a un único sitio de la CGSM y a la fecha no había sido probado. Para mejorar su sensibilidad y predictibilidad para simular tendencias del Área Basal (AB) de los árboles de Rhizophora mangle, Avicennia germinans y Laguncularia racemosa en este estudio se validó, calibró y ajustó el modelo FORMAN, usando datos de 16 años de monitoreo. Para ello, se modificó la interfaz del modelo y se ajustaron algunas rutinas de cálculo y parámetros. Se ejecutaron dos escenarios de simulación: (1) Asumiendo estabilidad en el intervalo de variación de la salinidad y, (2) aumentado la salinidad de acuerdo con el incremento promedio de los últimos tres años. Los ajustes en las tasas de reclutamiento y salinidad calculada permitieron calibrar el modelo y reproducir el patrón y la magnitud observada en tres estaciones. En dos estaciones solo se reprodujo el patrón de los datos. Las tendencias generales del AB de cada especie y su dinámica, así como las magnitudes actuales para las estaciones que sufrieron mayor impacto inicialmente, fueron reproducidas adecuadamente. Bajo un escenario en el que la salinidad se mantiene en un intervalo estable, el sistema alcanzaría la estabilidad en el largo plazo (>100 años). Un incremento promedio constante en la salinidad intersticial, resultaría en una disminución severa del AB en el corto plazo (menos de 20 años), demostrando la vulnerabilidad de la CGSM a los incrementos en salinidad y la necesidad de implementar medidas de manejo sostenibles en el tiempo. El estudio contribuye al entendimiento de la dinámica de lagunas costeras tropicales en el largo plazo y resalta la importancia de la modelación como herramienta básica para los proyectos de rehabilitación y manejo.

scholarly journals Paleoenvironment interpretation of a 1760 years B.P. old sediment in a mangrove area of the Bay of Guanabara, using pollen analysis

2006 ◽  
Vol 78 (2) ◽  
pp. 227-229 ◽  
Author(s):  
Ortrud M. Barth ◽  
Luiz E.U. São-Thiago ◽  
Marcia A. Barros
Keyword(s):  
Pollen Analysis ◽  
Rain Forest ◽  
Pollen Grains ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Mangrove Area ◽  
Sandy Ground ◽  
Drilling Core ◽  
Actual Size ◽  
Avicennia Schaueriana

A sediment sample was obtained at 122 cm from the top of a drilling core in the Guapimirim mangrove, Bay of Guanabara, and analyzed using pollen analysis. This muddy core reached a sandy ground at 133 cm. 14C datation got the age of 1760 ± 50 years B.P. The most frequent pollen grains were mangrove species of Rhizophora mangle, Laguncularia racemosa and Avicennia schaueriana. "Restinga" and tropical rain forest vegetation was recognized behind the mangrove. After the last sea transgression at 2500 years B.P., the water level lowered to its actual size, allowing the installation of this mangrove.

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