scholarly journals Species diversity, taxon structure and distribution of the Chlorophytes on Truong Sa archipelago

2020 ◽  
Vol 20 (4) ◽  
pp. 427-436
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Thu Hang ◽  
Phan Thu Hue ◽  
Tran Dinh Lan
Keyword(s):  
Species Diversity ◽  
Intertidal Zone ◽  
Similarity Coefficient ◽  
Subtidal Zone ◽  
Number Of Species ◽  
Total Species

The results of research on characteristic of distribution and taxa structure of Chlorophytes (Chlorophyta) at nine islands of Truong Sa archipelago (Truong Sa, Da Tay, Thuyen Chai, Toc Tan, Sinh Ton, Nam Yet, Song Tu Tay, Da Nam and Son Ca) indicate that there are 67 species of Chlorophytes, they belong to 4 orders, 14 families and 22 genera. The number of species at the sampling islands ranged from 13 species/island (Toc Tan isd.) to 43 species/island (Nam Yet isd.) with the average of 25.5 species/island. Sorensen similarity coefficient at the sampling sections ranged from 0.24 (between Song Tu Tay and Thuyen Chai) to 0.74 (between Nam Yet and Song Tu Tay) with the average of 0.45. Among 67 species in nine islands, there are 10 species distributed only in the intertidal zone (they are occupying 14.9% of total species), 14 species (31.4%) in subtidal zone only and 43 species (64.2%) in both intertidal zone and subtidal zone. The number of species concentrates on some genera (Halimeda: 10 species; Caulerpa: 10 species; Codium: 6 species,...), they belong to Codiacea, Siphonales. There are some genera with only 1 species (Tydemania, Anadyomene, Microdictyon,...).

scholarly journals Jenis-Jenis Gastropoda di Zona Intertidal Pantai Indrayanti Yogyakarta

2021 ◽  
Vol 5 (1) ◽  
pp. 187
Author(s):  
Dian Fita Lestari ◽  
Fatimatuzzahra Fatimatuzzahra ◽  
Syukriah Syukriah
Keyword(s):  
Data Analysis ◽  
Fresh Water ◽  
Intertidal Zone ◽  
Morphological Characteristics ◽  
Marine Organisms ◽  
Sampling Techniques ◽  
White Sand ◽  
Rocky Substrate ◽  
Number Of Species ◽  
Total Species

Gunung Kidul is one of the districts in Yogyakarta that has a long coastline with coral substrate and white sand. One of the beaches with coral and rocky substrates is Indrayanti Beach. The rocky substrate provides unique characteristics for the life of marine organisms in the intertidal zone. Gastropods is one of the seven classes in the Mollusc phylum. Gastropods are found mostly in the sea and fresh water, especially in the intertidal zone of beach. The aim of this study is to identify gastropods that found in the Indrayanti intertidal zone and classifying each species. The method of this study is observation and sampling techniques with accidental sampling at low tide. Data analysis is descriptive based on morphological characteristics of each species. Based on the results of this study, there are 5 sub-classes, 9 orders, 2 Superfamily, 21 families, 35 genera and 72 species. Sub-classes found are heterobranchia, caenogastropods, neritimorpha, vestigastropods, and patelogastropods. The highest number of species found in the caenogastropod subclass was 32 species (44% of the total species) which were dominated by the order of neogastropod.

scholarly journals Taxonomic structure of the flora of Male Opillya

2021 ◽  
Vol 78 (1) ◽  
pp. 32-38
Author(s):  
M. Seniv ◽  
◽  
L. Tasenkevich ◽  
Keyword(s):  
Species Diversity ◽  
Characteristic Feature ◽  
Plant Diversity ◽  
Vascular Plants ◽  
Single Species ◽  
Taxonomic Diversity ◽  
Taxonomic Structure ◽  
Number Of Species ◽  
Western Ukraine ◽  
Total Species

The article provides information on the flora of Male Opillya, the southwesternmost part of the Opillya area, Western Ukraine. The ecological and geographical peculiarities of the area determine its rich plant diversity. The flora of Male Opillya comprises 1325 species of vascular plants belonging to 511 genera, 95 families and five divisions. A characteristic feature of the flora of this area is a small number of vascular cryptogamic plants and gymnosperms – 27 species, or 2.04% of the total number of species of vascular plants. The division Magnoliophyta consists of 1298 species (97.96%), of them Liliopsida accounts for 21.21% and Magnoliopsida – 76.75%. Taxonomic diversity of the flora is characterized by the following proportions: mean number of species per family is 13.95, mean number of genera per family – 5.38, mean number of species per genus – 2.59. The ten leading families by number of taxa contain together 757 species (57% of the total number) and 134 genera. Among them, the best represented families are Asteraceae (193, or 25.5%), Poaceae (105, or 13.87%), and Rosaceae (71, or 9.38%). The ten largest genera by number of species (from 51 to 14 species in each), comprise 204 species, or 15.4% of the total species diversity. Of them, the following genera contain the highest number of species: Carex (51 species), Hieracium (25), and Veronica (23). The genera represented by a single species make up more than half of all genera of the flora (277, or 54.21%).

scholarly journals Vertebrate wildlife diversity of Sreepur upazila, Magura, Bangladesh

2022 ◽  
Vol 7 (1) ◽  
pp. 51-62
Author(s):  
AK Mandal ◽  
MF Jaman ◽  
MM Alam ◽  
MF Rabbe ◽  
AR Shome
Keyword(s):  
Species Diversity ◽  
Management Plan ◽  
Scientific Study ◽  
Wildlife Species ◽  
Number Of Species ◽  
Total Species ◽  
Conservation And Management ◽  
Near Threatened

The species diversity and abundance of wildlife are the important indicators of a healthy ecosystem. A survey-based scientific study on species diversity, abundance and status of vertebrate wildlife was conducted from May 2015 to April 2016 at Sreepur upazila, Magura, Bangladesh. A total of 123 species of vertebrate wildlife was recorded during the 12 months of study period. Among them, eight species (6.5%) were amphibians, 13 (10.57%) reptiles, 84 (68.29%) birds and 18 species (14.64%) were mammals. Out of 84 species of birds, 45 (53.57%) were passerines and 39 (46.43%) non-passerines. Most of the observed birds (72 species, 85.72%) were resident and the rest 12 species (14.28%) were migratory. The highest number of wildlife species was observed in winter (108 species, 87.80%), particularly in December (62 species, 50.40%). The lowest number of species was recorded in June (33 species, 26.83%). Out of 123 species of vertebrate wildlife, three (2.44%) were very common, nine (7.32%) common, 26 (21.14%) fairly common and 85 (69.1%) were common. Of the total species, 117 (95.12%) species were least concern, five (4.06%) near threatened and one (0.81%) was endangered according to IUCN Bangladesh 2015. Implementation of conservation and management plan is required to save the wildlife in the study area. J. Biodivers. Conserv. Bioresour. Manag. 2021, 7(1): 51-62

scholarly journals Hydrozoan colonization and succession in the tidal and subtidal zones in Surtsey during the period 1967 to 1984

2020 ◽  
Vol 14 ◽  
pp. 131-139
Author(s):  
Steffen Lundsteen ◽  
Erlingur Hauksson ◽  
Karl Gunnarsson
Keyword(s):  
Intertidal Zone ◽  
Marine Invertebrate ◽  
Subtidal Zone ◽  
Rocky Shores ◽  
Species Numbers ◽  
Number Of Species ◽  
Rocky Bottom ◽  
Floating Objects

This article reports on results of investigations of hydrozoans collected in Surtsey, Iceland in the period 1967 – 1984. Samples were collected in the intertidal zone and by divers in the subtidal zone down to 40 m. A list and illustrations of hydrozoan species found in the intertidal and subtidal rocky bottom in Surtsey are presented. Species numbers increased steadily during the study period and in 1984 a total of 37 species were recorded in Surtsey making hydrozoans one of the most diverse marine invertebrate groups in Surtsey. Among hydrozoans found during the study are 8 species not previously recorded in Iceland. Apart from dispersal by planktonic medusa, rafting of polyps on floating objects drifting to Surtsey is thought to be important for colonisation of hydrozoan fauna in Surtsey. At the end of the investigations period, 20 years after formation of rocky shores on the island, number of species seemed to be continually increasing

Species composition and distribution of marine macro algae at Co To and Thanh Lan archipelago

2020 ◽  
Vol 20 (3) ◽  
pp. 267-276
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Mai Anh ◽  
Linh Manh Nguyen ◽  
Pham Thu Hue ◽  
Lawrence Liao
Keyword(s):  
Species Composition ◽  
Littoral Zone ◽  
Marine Algae ◽  
Similarity Coefficient ◽  
Algal Flora ◽  
Average Value ◽  
Site Number ◽  
Species Composition And Distribution ◽  
Total Species ◽  
Macro Algae

This paper exhibites species composition and distribution of marine seaweed at 10 sites of Co To and Thanh Lan islands in May 2019. The studies record 76 species of marine algae in the area, belonging to four divisions: Cyanophytes, Rhodophytes, Ochrophytes and Chlorophytes. Among them, five species are classified into Cyanophytes (comprising 6.6% of total species); thirty-four species into Rhodophytes (44.7%); twenty-one species into Ochrophytes/Phaeophytes (27.6%) and sixteen species into Chlorophytes (21.1%). The species composition of marine seaweeds in Co To and Thanh Lan shows significant differences as follows: 22 species (sites number 4 and 10) to 58 species (site number 2) and the average value is 38.7 species per site. Sørensen similarity coefficient fluctuates from 0.33 (sites number 5 and 10) to 0.84 (sites number 1 and 3) and the average value is 0.53. The current investigations show that four species of twenty-one species are collected in the littoral zone and forty-two species in the sub-littoral zone (in which there are thirteen species distributed in both littoral zone and sub-littoral zone). The algal flora in Co To and Thanh Lan is characterized by subtropics.

Species diversity of macrobenthos in the rocky intertidal zone of Yushan Island

2011 ◽  
Vol 19 (5) ◽  
pp. 511-518
Author(s):  
Jiao Haifeng ◽  
Peng Xiaoming ◽  
You Zhongjie ◽  
Shi Huixiong ◽  
Lou Zhijun ◽  
...  
Keyword(s):  
Species Diversity ◽  
Intertidal Zone ◽  
Rocky Intertidal ◽  
Rocky Intertidal Zone

scholarly journals Composition and Distribution of Deep Water Macroalgae Species from the Continental Shelf of Sergipe State, Brazil

Phytotaxa ◽  
2014 ◽  
Vol 190 (1) ◽  
pp. 250 ◽  
Author(s):  
Sonia Maria Barreto Pereira ◽  
JULIANA TORRES ◽  
Lisia Monica de Souza Gestinari
Keyword(s):  
Continental Shelf ◽  
Deep Water ◽  
Number Of Species ◽  
Total Species ◽  
New Occurrences ◽  
Benthic Macroalgae

This study investigates the deep-water flora of the continental shelf in Sergipe State, Brazil located between 10º36’08’’ – 11º21’07’’S and 36º28’10’’ – 37º13’47’’W. The samples were collected by dragging at 18 sampling sites, between 10 to 30 m depth, from May 1999 to March 2000. A total of 91 taxa of marine benthic macroalgae were identified (56 Rhodophyta, 20 Heterokontophyta and 15 Chlorophyta). Forty-seven (47) of these are new occurrences for Sergipe flora. Rhodophyta dominated, accounting for 61% of the total species collected, with the order Ceramiales having the highest number of species present (39.55%), followed by Heterokontophyta (23%), mostly represented by Dictyotales (65%). Finally, 15 Chlorophyta taxa were found (16%), mainly composed of Bryopsidales (53%).

scholarly journals Fish species diversity in headwaters streams of Paraguay and Paraná Basins

2007 ◽  
Vol 50 (6) ◽  
pp. 1033-1042 ◽  
Author(s):  
Yzel Rondon Súarez ◽  
Sabrina Bigatão Valério ◽  
Karina Keyla Tondado ◽  
Alexandro Cezar Florentino ◽  
Thiago Rota Alves Felipe ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Environmental Factors ◽  
Fish Species ◽  
Total Species Richness ◽  
Paraná Basin ◽  
Parana Basin ◽  
Number Of Individuals ◽  
Total Species ◽  
Fish Species Diversity

The influence of spatial, temporal and environmental factors on fish species diversity in headwater streams in Paraguay and Paraná basins, Brazil was examined. A total of 4,605 individuals were sampled, distributed in 60 species. The sampled streams in Paraná basin presented a larger total species richness (42) than Paraguay streams (40). However the estimated richness was larger in Paraguay basin (53) than Paraná streams (50). The streams of Paraná basin had a greater mean species richness and evenness, while more individuals per sample were found in the Paraguay basin. Difference between the sub-basins were found in the Paraguay basin, while for the basin of Paraná, richness and evenness vary significantly between the sub-basins, but the number of individuals varied seasonally. The most important environmental factors to species diversity and abundance were altitude, water temperature, stream width and stream depth for both the basins.

Tree density, basal area and species diversity in a disturbed dry tropical forest of northern India: implications for conservation

2006 ◽  
Vol 33 (3) ◽  
pp. 256-262 ◽  
Author(s):  
R. SAGAR ◽  
J.S. SINGH
Keyword(s):  
Species Diversity ◽  
Tropical Forest ◽  
Basal Area ◽  
Tree Density ◽  
Dry Forest ◽  
Conservation Strategies ◽  
Stem Density ◽  
Dry Tropical Forest ◽  
Number Of Species ◽  
Northern India

Dry tropical forest communities are among the world's most threatened systems and urgent measures are required to protect and restore them in degraded landscapes. For planning conservation strategies, there is a need to determine the few essential measurable properties, such as number of species and basal area, that best describe the dry forest vegetation and its environment, and to document quantitative relationships among them. This paper examines the relationships between forest basal area and diversity components (number of species and evenness) for a disturbed dry tropical forest of northern India. Data were collected from five sites located in the Vindhyan dry tropical forest of India, selected on the basis of satellite images and field observations to represent the entire range of conditions in terms of canopy cover and disturbance regimes. These sites represented different communities in terms of species composition. The forest was poorer in species richness, and lower in stem density and basal area than wet forests of the tropics. Across sites (communities), the diversity components and tree density were positively related with total tree basal area. Considering basal area as a surrogate of biomass and net production, diversity is found to be positively associated with productivity. A positive relationship between basal area, tree density and species diversity may be an important characteristic of the dry forest, where recurring disturbance does not permit concentration of biomass or stems in only a few strong competitors. However, the relationships of basal area with density, alpha diversity and evenness remain statistically significant only when data from all sites, including the extremely disturbed one, are used in the analysis. In some sites there was a greater coefficient of variation (CV) of basal area than in others, attributed to patchy distribution of stems and resultant blanks. Therefore, to enhance the tree diversity of these forests, the variability in tree basal area must be reduced by regulating local disturbances. Conservation activities, particularly fuelwood plantations near human settlements, deferred grazing and canopy enrichment through multi-species plantations of nursery-raised or wild-collected seedlings of desirable species within the forest patches of low basal area, will be needed to attain restoration goals, but reforestation programmes will have to be made attractive to the forest-dwelling communities.

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