scholarly journals Polychaeta (Annelida) from the continental shelf off Aveiro (NW Portugal): Species composition and community structure

Check List ◽  
2013 ◽  
Vol 9 (3) ◽  
pp. 533 ◽  
Author(s):  
Ascensão Ravara ◽  
Maria Helena Moreira
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Continental Shelf ◽  
New Records ◽  
Depth Range ◽  
Sediment Distribution ◽  
Polychaete Species ◽  
Nw Portugal ◽  
Specific Composition ◽  
Composition And Structure

The present study provides a checklist of the polychaete fauna collected on the continental shelf off Aveiro (NW Portugal), within an area located between latitudes 40°30’N and 40°50’N and longitudes 8°40’W and 9°20’W, and a depth range of 8 to 185 m. The list includes 136 species, belonging to 37 families, from which 19 are new records for the Portuguese coast (Isolda pulchella, Mesochaetopterus sagittarius, Aphelochaeta multibranchis, Chaetozone cf. vivipara, Diplocirrus hirsutus, Goniadella gracilis, Gyptis mediterranea, Lumbrinerides crassicephala, Eumida bahusiensis, Eumida ockelmanni, Nereiphylla paretti, Phyllodoce rosea, Glyphohesione klatti, Malmgreniella arenicolae, Prionospio aluta, Pseudopolydora paucibranchisata, Pseudopolydora pulchra, Scolelepis mesnili, Polycirrus cf. medusa). The shelf off Aveiro presents a well- defined pattern of sediment distribution, with finer sand on the inner (8–22 m depth) and the outer (94–184 m depth) parts of the shelf and coarser sediments on the mid-shelf. The distribution of polychaete assemblages follows closely the aforementioned sedimentary pattern, showing different specific composition and structure in each of the three areas. Depth was also found to play an important role in the distribution of some polychaete species.

scholarly journals Species composition and structure of degraded mangrove vegetation in the Air Telang Protected Forest, South Sumatra, Indonesia

2019 ◽  
Vol 20 (8) ◽  
Author(s):  
SYAIFUL Eddy ◽  
MOH. RASYID RIDHO ◽  
ISKHAQ ISKANDAR ◽  
ANDY MULYANA
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Diversity Index ◽  
Anthropogenic Activities ◽  
Timber Harvesting ◽  
Secondary Forests ◽  
Species Diversity Index ◽  
Composition And Structure ◽  
Mangrove Vegetation ◽  
Species Composition And Structure

Abstract. Eddy S, Ridho MR, Iskandar I, Mulyana A. 2019. Species composition and structure of degraded mangrove vegetation in the Air Telang Protected Forest, South Sumatra, Indonesia. Biodiversitas 20: 2119-2127. Air Telang Protected Forest (ATPF) is one of the protected forests in the coastal area of South Sumatra, Indonesia which is around 12,660.9 hectares. This area is strategic because it borders directly with the Bangka Strait and adjacent to Sembilang National Park making it easy to access by the community. Various anthropogenic activities in the region such as residential, farming, agriculture, aquaculture, port and timber harvesting have led to degradation and loss of primary mangrove forest. This study aims to analyze the species composition and community structure of mangrove vegetation in the ATPF. The data were collected through observations at several point-centered samplings which were used to analyze the species composition and community structure of the vegetation and the physicochemical conditions of the environment. The species composition of this area consists of 20 species belonging to 14 families. The dominant species of tree, sapling and seedling stages are Nypa fruticans, Rhizophora apiculata and Acrostichum aureum, respectively. Overall species diversity index in this region is classified as very low, ranging from 0.00 to 0.73. Cluster analysis showed three types of vegetation structures in this region, namely Cyperus-Acrostichum type (shrub vegetation), Acrostichum-Rhizophora type (secondary forests) and Nypa-Avicennia (primary forests).

scholarly journals Prokaryotic Metabolic Activity and Community Structure in Antarctic Continental Shelf Sediments

2003 ◽  
Vol 69 (5) ◽  
pp. 2448-2462 ◽  
Author(s):  
J. P. Bowman ◽  
S. A. McCammon ◽  
J. A. E. Gibson ◽  
L. Robertson ◽  
P. D. Nichols
Keyword(s):  
Community Structure ◽  
Continental Shelf ◽  
Phospholipid Fatty Acid ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Most Probable Number ◽  
Total Bacterial Count ◽  
Depth Range ◽  
Shelf Area ◽  
Probable Number

ABSTRACT The prokaryote community activity and structural characteristics within marine sediment sampled across a continental shelf area located off eastern Antarctica (66°S, 143°E; depth range, 709 to 964 m) were studied. Correlations were found between microbial biomass and aminopeptidase and chitinase rates, which were used as proxies for microbial activity. Biomass and activity were maximal within the 0- to 3-cm depth range and declined rapidly with sediment depths below 5 cm. Most-probable-number counting using a dilute carbohydrate-containing medium recovered 1.7 to 3.8% of the sediment total bacterial count, with mostly facultatively anaerobic psychrophiles cultured. The median optimal growth temperature for the sediment isolates was 15°C. Many of the isolates identified belonged to genera characteristic of deep-sea habitats, although most appear to be novel species. Phospholipid fatty acid (PLFA) and isoprenoid glycerol dialkyl glycerol tetraether analyses indicated that the samples contained lipid components typical of marine sediments, with profiles varying little between samples at the same depth; however, significant differences in PLFA profiles were found between depths of 0 to 1 cm and 13 to 15 cm, reflecting the presence of a different microbial community. Denaturing gradient gel electrophoresis (DGGE) analysis of amplified bacterial 16S rRNA genes revealed that between samples and across sediment core depths of 1 to 4 cm, the community structure appeared homogenous; however, principal-component analysis of DGGE patterns revealed that at greater sediment depths, successional shifts in community structure were evident. Sequencing of DGGE bands and rRNA probe hybridization analysis revealed that the major community members belonged to delta proteobacteria, putative sulfide oxidizers of the gamma proteobacteria, Flavobacteria, Planctomycetales, and Archaea. rRNA hybridization analyses also indicated that these groups were present at similar levels in the top layer across the shelf region.

Specific composition and structure of population phytopathogens of vegetable crops

2019 ◽  
Vol 326 (3) ◽  
pp. 76-78
Author(s):  
V.L. Nalobova ◽  
◽  
N.S. Opimah ◽  
M.V. Nalobova ◽  
I.V. Haponenka ◽  
...  
Keyword(s):  
Vegetable Crops ◽  
Specific Composition ◽  
Composition And Structure ◽  
Structure Of Population

Long-term dynamics and destruction of marsh vegetation in the Kolokolkova Bay of the Barents Sea

2012 ◽  
pp. 66-77 ◽  
Author(s):  
I. A. Lavrinenko ◽  
O. V. Lavrinenko ◽  
D. V. Dobrynin
Keyword(s):  
Species Composition ◽  
Plant Communities ◽  
Barents Sea ◽  
Mean Value ◽  
Marsh Vegetation ◽  
Composition And Structure ◽  
The Mean ◽  
Species Composition And Structure

The satellite images show that the area of marshes in the Kolokolkova bay was notstable during the period from 1973 up to 2011. Until 2010 it varied from 357 to 636 ha. After a severe storm happened on July 24–25, 2010 the total area of marshes was reduced up to 43–50 ha. The mean value of NDVI for studied marshes, reflecting the green biomass, varied from 0.13 to 0.32 before the storm in 2010, after the storm the NDVI decreased to 0.10, in 2011 — 0.03. A comparative analysis of species composition and structure of plant communities described in 2002 and 2011, allowed to evaluate the vegetation changes of marshes of the different topographic levels. They are fol­lowing: a total destruction of plant communities of the ass. Puccinellietum phryganodis and ass. Caricetum subspathaceae on low and middle marches; increasing role of halophytic species in plant communities of the ass. Caricetum glareosae vic. Calamagrostis deschampsioides subass. typicum on middle marches; some changes in species composition and structure of plant communities of the ass. Caricetum glareosae vic. Calamagrostis deschampsioides subass. festucetosum rubrae on high marches and ass. Parnassio palustris–Salicetum reptantis in transition zone between marches and tundra without changes of their syntaxonomy; a death of moss cover in plant communities of the ass. Caricetum mackenziei var. Warnstorfia exannulata on brackish coastal bogs. The possible reasons of dramatic vegetation dynamics are discussed. The dating of the storm makes it possible to observe the directions and rates of the succession of marches vegetation.

TAXON DIVERSITY AND COMMUNITY STRUCTURE OF FOSSIL MOLLUSCAN ASSEMBLAGES FROM THE MID-ATLANTIC CONTINENTAL SHELF (USA)

2018 ◽  
Author(s):  
Carmi Milagros Thompson ◽  
◽  
Rowan Lockwood ◽  
E.N. Worthington ◽  
Kelvin W. Ramsey
Keyword(s):  
Community Structure ◽  
Continental Shelf

New record of the deep water Epimeria morronei Winfield, Ortiz & Hendrickx (Amphipoda, Gammaridea, Epimeriidae) in the east Pacific

Crustaceana ◽  
2014 ◽  
Vol 87 (14) ◽  
pp. 1699-1703
Author(s):  
Michel E. Hendrickx ◽  
Ignacio Winfield ◽  
Manolo Ortiz
Keyword(s):  
Deep Water ◽  
Environmental Conditions ◽  
New Record ◽  
New Records ◽  
Eastern Pacific ◽  
Depth Range ◽  
East Pacific

New records for the deep-water amphipod Epimeria morronei Winfield, Ortiz & Hendrickx, 2012, are presented for the eastern Pacific. Also, new data related to its depth range and environmental conditions are given.

scholarly journals Potential impact of increased temperature and CO2 on particulate dimethylsulfoniopropionate in the Southeastern Bering Sea

2011 ◽  
Vol 2 (1) ◽  
pp. 33 ◽  
Author(s):  
Peter A. Lee ◽  
Sarah F. Riseman ◽  
Clinton E. Hare ◽  
David A. Hutchins ◽  
Karine Leblanc ◽  
...  
Keyword(s):  
Community Structure ◽  
Continental Shelf ◽  
Bering Sea ◽  
Feedback Mechanism ◽  
Climate Feedback ◽  
Algal Community ◽  
Central Basin ◽  
Phytoplankton Assemblages ◽  
Potential Impact ◽  
Relative Abundances

The potential impact of elevated sea surface temperature (SST) and pCO2 on algal community structure and particulate dimethylsulfoniopropionate (DMSPp) concentrations in the southeastern Bering Sea was examined using a shipboard “Ecostat” continuous culture system. The ecostat system was used to mimic the conditions projected to exist in the world's oceans by the end of this century (i.e. elevated pCO2 (750 ppm) and elevated SST (ambient + 4°C). Two experiments were conducted using natural phytoplankton assemblages from the high-nutrient low-chlorophyll (HNLC) central basin and from the middle domain of the southeastern continental shelf. At the HNLC site, the relative abundances of haptophytes and pelagophytes were higher and the relative abundance of diatoms lower under “greenhouse” conditions (i.e. combined 750 ppm CO2 and elevated temperature) than control conditions (380 ppm CO2 and ambient temperature). This shift in algal community structure was accompanied by increases in DMSPp (2–3 fold), DMSPp:Chl a (2–3 fold) and DMSP:PON (2 fold). At the continental shelf site, the changes in the relative abundances of haptophytes, pelagophytes and diatoms under “greenhouse” conditions were similar to those observed at the HNLC site, with 2.5 fold increases in DMSPp, 50–100% increases in DMSPp:Chl a and 1.8 fold increases in DMSP:PON. At both locations, changes in community structure and the DMSPp parameters were largely driven by increasing temperature. The observed changes were also consistent with the phytoplankton-DMS-albedo climate feedback mechanism proposed in the Charlson-Lovelock-Andreae-Warren (CLAW) hypothesis.

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