Epiphytic diatom communities on Phyllophora antarctica from the Ross Sea

2014 ◽  
Vol 27 (1) ◽  
pp. 44-56 ◽  
Author(s):  
Roksana Majewska ◽  
Mario De Stefano
Keyword(s):  
Species Composition ◽  
Growth Form ◽  
Ross Sea ◽  
Distribution Patterns ◽  
Trophic Levels ◽  
Sampling Effort ◽  
Epiphytic Diatoms ◽  
Diatom Communities ◽  
Ice Conditions ◽  
Species Composition And Distribution

AbstractAntarctic seaweeds play an important ecological role, but the vast macroalgal beds, typical of the shallow-water zone, are not efficiently grazed. However, macroalgal thalli are covered by epiphytic diatoms which represent a rich food source for higher trophic levels. We describe the abundances, growth form structure, species composition and distribution patterns in the diatom communities associated with Phyllophora antarctica from selected sites within the Ross Sea. The goal of this work was to learn more about the relationships between various components of the epiphytic community and its habitat. To examine diatoms at the microscale, four relatively well described sampling sites were chosen and analyses were performed on a large number of diatoms. All observations and counts were made with the scanning electron microscope. Samples collected in the same season but from different sites and under different sea and ice conditions differed significantly in terms of species composition, but all represented abundant and well-developed diatom communities. A list of species associated with P. antarctica from the investigated area is provided and the influence of the sampling effort on the observed diatom diversity is assessed.

scholarly journals Asosiasi Echinodermata pada Ekosistem Padang Lamun di Pantai Samuh, Nusa Dua, Bali

2018 ◽  
Vol 5 (1) ◽  
pp. 100
Author(s):  
Wahyu Ilvita Vindia ◽  
Pande Gde Sasmita Julyantoro ◽  
Endang Wulandari
Keyword(s):  
Species Composition ◽  
Coastal Waters ◽  
Positive Association ◽  
Distribution Patterns ◽  
Limited Information ◽  
Halophila Ovalis ◽  
Seagrass Ecosystem ◽  
Syringodium Isoetifolium ◽  
Species Composition And Distribution ◽  
Diadema Setosum

Seagrass beds and their associate biota are very important in maintaining the balance of coastal ecosystems. Samuh Beach is one of seagrass ecosystem area in Bali Island. One of the biota that exists in the seagrass ecosystem in Samuh Beach is Echinodermata. Since the limited information and the complex activities at Samuh Beach make research about associations of Echinodermata with seagrass, this research seems become important to be conducted. This study was aimed to determine the density of species, species composition, and distribution patterns of lamun and Echinodermata in the coastal waters of Samuh beach. Data analysis was performed by using density type, species composition, dispersion index of morisita and association. The average seagrass density of each station in Samuh coastal waters ranged from 156-246 stands/m2 and the highest density of Echinoderms is Diadema setosum in each station. The species composition of seagrass in Samuh beach comprises five species of seagrass namely: Enhalus acoroides, Halophila ovalis, Thalassodendron ciliatum, Cymodocea serrulata and Syringodium isoetifolium. The composition of Echinodermata species that found amounted to 13 species of Echinodermata namely: Diadema setosum, Amphiura sp., Archaster typicus, Asterias sp., Mespilia globulus, Tripneustes gratilla, Pseudoboletia maculata, Protoreaster nodusus, Ophiactis resillens, Ophiopteris antipodum, Centrostephanus rodgersii, Echinothrix and Echinothrix mathei. Based on the calculation of morisita, seagrass and Echinodermata Index in Samuh Beach was spread uniformly and clumped. The result of association analysis showed that there were positive association, negative association and association with no relation between seagrass and Echinodermata in Samuh Beach.

Epiphytic diatoms and water quality in shallow lakes: the neutral substrate hypothesis revisited

2010 ◽  
Vol 61 (12) ◽  
pp. 1457 ◽  
Author(s):  
Cristina Cejudo-Figueiras ◽  
Irene Álvarez-Blanco ◽  
Eloy Bécares ◽  
Saúl Blanco
Keyword(s):  
Water Quality ◽  
Quality Assessment ◽  
Shallow Lakes ◽  
Water Quality Assessment ◽  
Trophic Levels ◽  
Nutrient Concentrations ◽  
North West ◽  
Epiphytic Diatoms ◽  
Diatom Indices ◽  
Diatom Communities

For bioassessment of freshwaters, diatom indices have been mainly used in streams although their applicability in shallow lakes has been demonstrated in several studies. However, the influence of sampling substrata on periphytic diatom communities and on the ecological quality inferred from them has been paid little attention. In this paper, we test the ‘neutral substrate hypothesis’, which predicts no relevant influence of host plant type on their epiphytic community. Nineteen shallow permanent lakes from north-west Spain were studied and classified into three trophic levels. Epiphytic diatom communities growing on three different macrophytes for each trophic level were sampled and analysed. We assess: (1) which of the most common diatom indices provides a reliable water quality assessment, (2) how different plant substrata influence the diatom communities growing on them and (3) how these differences affect water quality assessment. Similarity tests showed significant differences in the composition of diatom assemblages among nutrient concentrations and host macrophytes. In contrast, ANOVA results for selected diatom-based metrics showed significant differences among trophic levels but not between different plant substrata. This supports the use of epiphytic diatoms as biological indicators for shallow lakes irrespective of the dominant macrophyte.

scholarly journals Species composition and distribution patterns of Ottelia acuminata community in Lake Jianhu, northwestern Yunnan

2017 ◽  
Vol 29 (3) ◽  
pp. 687-695 ◽  
Author(s):  
LI Ningyun ◽  
◽  
CHEN Yuhui ◽  
HU Jinming ◽  
LIU Zhaopeng ◽  
...  
Keyword(s):  
Species Composition ◽  
Distribution Patterns ◽  
Species Composition And Distribution ◽  
Northwestern Yunnan

Growth form analysis of epiphytic diatom communities of Terra Nova Bay (Ross Sea, Antarctica)

Polar Biology ◽  
2012 ◽  
Vol 36 (1) ◽  
pp. 73-86 ◽  
Author(s):  
Roksana Majewska ◽  
Maria Cristina Gambi ◽  
Cecilia Maria Totti ◽  
Chiara Pennesi ◽  
Mario De Stefano
Keyword(s):  
Growth Form ◽  
Ross Sea ◽  
Form Analysis ◽  
Terra Nova Bay ◽  
Diatom Communities ◽  
Terra Nova

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.

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