diversity structure
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Author(s):  
Eguale Tadesse Kifle ◽  
Asia Khamzina ◽  
Yowhan Son ◽  
Florent Noulèkoun ◽  
Abdu Abdelkadir ◽  
...  

Rhizosphere ◽  
2021 ◽  
Vol 20 ◽  
pp. 100435
Author(s):  
Jailson do Nascimento Silva ◽  
Lucas William Mendes ◽  
Jadson Emanuel Lopes Antunes ◽  
Vania Maria Maciel Melo ◽  
Francisca Andrea da Silva Oliveira ◽  
...  

2021 ◽  
Vol 13 (4) ◽  
pp. 165-182
Author(s):  
Henry Seraphin Essomba ◽  
Jean Lagarde Betti ◽  
Richard Priso ◽  
Jules Ngueguim ◽  
Oumar Farrick Njimbam

2021 ◽  
Vol 22 (11) ◽  
Author(s):  
Nery Sofiyanti ◽  
Dyah Iriani ◽  
Ikhwan Taufiq ◽  
Maya Sari ◽  
Andre Irawan ◽  
...  

Abstract. Sofiyanti N, Iriani D, Taufik I, Sari M, Irawan A, Syauqi FM. 2021. Diversity, structure and composition of pteridophyte in varying habitats in Karimun Besar Island, Riau Islands Province, Indonesia. Biodiversitas 22: 4847-4856. Biodiversity of small islands, particularly in tropical region, always encourages scientific curiosity. Such curiosity is much greater when the small island of interest has been through various land use changes, such as in Karimun Besar Island. This island is one of thousand islands in Riau Islands Province, Indonesia and poses different land uses. However, studies on the biodiversity of flora in this island have not been recorded, including for pteridophyte or fern members. This study aimed to examine the diversity, floristic structure and composition of pteridophyte at six different study sites in Karimun Besar Island representing varying habitat conditions (i.e., primary forest, secondary forest, rubber plantation, road side, coastal area and mined land. The sampling was collected by using transect method to measure density, dominance and frequency. A total of 32 species of pteridophytes were recorded from the six study sites that belong to two divisions, Polypodiophyta (31 species) and Lycophyta (1 species). The number of species of pteridophyte varied across the six habitats. The highest number of species (21) was found in primary forest, while the lowest (9 species) was found in rubber plantation. The dominant species for each study site were Taenitis blechnoides (Pteridaceae) (rubber plantation), Dicranopteris linearis (Gleicheniaceae) (secondary forest), Sticherus truncates (Gleicheniaceae) (primary forest), Pteridium caudatum (Dennstaedtiaceae) (road side), Achrosticum aureum (Pteridaceae) (coastal area) and Nephrolepis hirsutula (Nephrolepidaceae) (mined land). The result of this study provides the first data of fern in Karimun Besar Island that support pivotal information on the biodiversity of small islands in tropical region.


2021 ◽  
Author(s):  
Mihail Mustea ◽  

The relevance of the paper lies in the fact that in previous investigations of the ichthyofauna of Cuciurgan cooling reservoir, the main emphasis was placed on economically valuable species. However, a number of invasive fish species have been less investigated, despite occupying, and currently occupying, dominant positions in the structure of the ichthyocenosis of this aquatic ecosystem. The aim of the paper is to research and update data on the diversity, structure and functional status of the ichthyofauna of the Cuciurgan cooling reservoir in conditions of increased anthropogenic and bioinvasive impact. The invasive species Pseudorasbora parva was first identified in the resevoir ecosystem.


2021 ◽  
Vol 12 ◽  
Author(s):  
Lin Tan ◽  
Wei-ai Zeng ◽  
Yansong Xiao ◽  
Pengfei Li ◽  
Songsong Gu ◽  
...  

In the plant rhizosphere and endosphere, some fungal and bacterial species regularly co-exist, however, our knowledge about their co-existence patterns is quite limited, especially during invasion by bacterial wilt pathogens. In this study, the fungal communities from soil to endophytic compartments were surveyed during an outbreak of tobacco wilt disease caused by Ralstonia solanacearum. It was found that the stem endophytic fungal community was significantly altered by pathogen invasion in terms of community diversity, structure, and composition. The associations among fungal species in the rhizosphere and endosphere infected by R. solanacearum showed more complex network structures than those of healthy plants. By integrating the bacterial dataset, associations between fungi and bacteria were inferred by Inter-Domain Ecological Network (IDEN) approach. It also revealed that infected samples, including both the rhizosphere and endosphere, had more complex interdomain networks than the corresponding healthy samples. Additionally, the bacterial wilt pathogenic Ralstonia members were identified as the keystone genus within the IDENs of both root and stem endophytic compartments. Ralstonia members was negatively correlated with the fungal genera Phoma, Gibberella, and Alternaria in infected roots, as well as Phoma, Gibberella, and Diaporthe in infected stems. This suggested that those endophytic fungi may play an important role in resisting the invasion of R. solanacearum.


2021 ◽  
pp. 1-14
Author(s):  
Frederic C. Lounang Tchatchouang ◽  
Cedric Chimi Djomo ◽  
Vice Clotèxe Tajeukem ◽  
Paul Djibrilla ◽  
Joseph Youta Happi

2021 ◽  
Vol 22 (8) ◽  
Author(s):  
LULU YUNINGSIH ◽  
Hermansyah Hermansyah ◽  
Eddy Ibrahim ◽  
Marsi MARSI

Abstract. Yuningsih L, Hearmansyah, Ibrahim E, Marsi. 2021. Diversity, structure and composition of vegetation in post-coal mining reclamation area in Sumatra, Indonesia. Biodiversitas 22: 3392-3400. The majority of coal mines are operated through an open-pit system which has a significant impact on the environment. Therefore, reclamation and revegetation activities are required to recover ecological sustainability. This study aimed to analyze the diversity, structure, and composition of vegetation resulting from the post-mining revegetation process in a mining concession in Sumatra, Indonesia at various intervals of post-reclamation periods, namely 11 years, 10 years, 8 years, and 5 years. Data collection was conducted by sampling with a 2.5 percent intensity. The study discovered 23 species of naturally grow understory plants and 25 species of woody plants. The stand structure at the eleventh, tenth, and eighth years of revegetation resembled an inverted J curve. The Species Richness Index (R) was determined to be low, the Shannon diversity index (H’) was is low to moderate, whereas the evenness index was moderate to high. We concluded that the structure of vegetation in the post-mining reclamation region resembled that of a natural forest ecosystem, yet the biodiversity indicators remain low and below those of natural forest. We expected the result of this study can enrich the limited knowledge of the ecology of post-mining reclamation in the tropics.


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