Macroalgal distribution patterns in a shallow, soft-bottom lagoon, with emphasis on the nonnativeGracilaria vermiculophylla andCodium fragile

2006 ◽  
Vol 29 (3) ◽  
pp. 465-473 ◽  
Author(s):  
Mads Solgaard Thomsen ◽  
Karen J. McGlathery ◽  
Anna Christina Tyler
Keyword(s):  
Distribution Patterns ◽  
Soft Bottom

Spatio-temporal sublittoral macrobenthic distribution and dominant species in Guanabara Bay, Rio de Janeiro, Brazil

2020 ◽  
Author(s):  
L. A. Pessoa ◽  
P. C. Paiva ◽  
R. R. Paranhos ◽  
C. A. Echeverría ◽  
Marcos A. V. Freitas
Keyword(s):  
Annual Cycle ◽  
Temporal Distribution ◽  
Distribution Patterns ◽  
Rainfall Regime ◽  
Guanabara Bay ◽  
Soft Bottom ◽  
Gravity Corer ◽  
Structural Variables ◽  
High Dominance ◽  
Spatio Temporal

Abstract Soft-bottom macrobenthic invertebrates are sensitive to natural or anthropogenic changes in aquatic ecosystems. The distribution patterns of sublittoral macrobenthic species in Guanabara Bay were studied from 2005 to 2007. Samples were collected at ten stations during six surveys throughout the rainfall regime (dry, early and late rainy). Ten replicates were collected at each station by Gravity corer or skin diving. Van Dorn bottles (bottom water) and by Ekman sediment sampler (granulometry) provided material for abiotic data. Stations were grouped into sectors (Entrance, Intermediary and Inner) based on abiotic data and location. The Redundancy Analysis (RDA) and Parsimonious RDA for all years and each annual cycle showed indicator taxa with high dominance in each sector. PERMANOVA indicated a regular seasonality between the surveys for the first annual cycle (p <0.05), and an atypical pattern for the second (p> 0.05), possibly due the low rainfall observed during this period. The mosaic of soft-bottom substrates infers structural variables, and patterns of temporal distribution were basically influenced by parameters those indicating pollution and the SACW (South Atlantic Central Water) intrusion, as well as ecological attributes among species, such as: predation, competition. The Ervilia concentrica and Cypridinidae could be used as indicators for anthropic and natural impacts in the Guanabara Bay for the Entrance sector, while Cyprideis salebrosa and Cyprideis sp. for the Intermediary sector and Heleobia australis for the Inner sector.

Distribution and abundance of soft-bottom molluscs in Port Phillip Bay, Victoria, Australia

1974 ◽  
Vol 25 (3) ◽  
pp. 371 ◽  
Author(s):  
GCB Poore ◽  
S Rainer
Keyword(s):  
Distribution Patterns ◽  
Sediment Type ◽  
Soft Bottom ◽  
Surface Deposit ◽  
Suspension Feeders ◽  
Feeding Types ◽  
Marginal Areas ◽  
Feeding Type ◽  
Faunal Density ◽  
Main Determinants

The distribution of soft-bottom molluscs of Port Phillip Bay, Vic., is examined in terms of abundance, the distribution of feeding types and patterns of diversity, and related to environmental variables such as depth and sediment type. Six feeding types were distinguished among the 105 species collected. Infaunal suspension feeders dominated in marginal sandy substrates while surface deposit feeders dominated in the silt and clay sediments of the Central region and Corio Bay. Epifaunal suspension feeders, grazers, scavengers and predators were less abundant and were seldom dominant. Numbers of individuals and species, and diversity, varied widely but were generally higher in marginal areas. Four areas of the Bay were recognized on the basis of similarities in distribution patterns, the distribution of species numbers, of diversity and of the dominant feeding type: the Nepean sand banks, the deep water Central and Corio regions, marginal areas, and the shallow seagrass sand flats. The main determinants of mollusc distributions were substrate and food supply, while purely hydrological effects were limited to nearshore areas. Regional differences in diversity were related to sample size by correlation and regression; low faunal density caused diversity in the Exchange region to be considerably underestimated.

scholarly journals Distribution patterns of shallow water polychaetes (Annelida) along the Alexandria coast, Egypt (eastern Mediterranean)

2014 ◽  
Vol 15 (3) ◽  
pp. 635 ◽  
Author(s):  
M. M. DORGHAM ◽  
R. HAMDY ◽  
H. H. EL RASHIDY ◽  
M. M. ATTA ◽  
L. MUSCO
Keyword(s):  
Grain Size ◽  
Eastern Mediterranean ◽  
Distribution Patterns ◽  
Spatial And Temporal Variation ◽  
Soft Bottom ◽  
Levantine Sea ◽  
Physical Chemical ◽  
Structural Variables ◽  
Levant Basin ◽  
Relevant Factors

Shallow hard bottom and intertidal soft bottom polychaete assemblages of the Alexandria coast, southeastern Mediterranean (Levantine Sea), were studied during a complete annual cycle in order to analyze spatial temporal patterns of variation in assemblages, and relevant factors related to polychaete distribution. The present study recorded a total of 73 species, belonging to Syllidae (22 species), Nereididae (9 species), Serpulidae (6 species), Eunicidae (5 species) and other 19 families. The assemblages experienced pronounced spatial and temporal variation throughout the study area, but spatial variation appeared more important in determining the observed patterns. Polychaete distribution related to variation of grain size and sessile macrobenthos cover suggesting that these structural variables accounted more than the physical-chemical ones (namely BOD, dissolved oxygen, organic carbon, organic matter, salinity, temperature, pH) in influencing the patterns of assemblages’ distribution. The present study is the southeastern-most one dealing with ecology and distribution patterns of hard bottom polychaetes from the Mediterranean Sea, as well as one of the few studies dealing with intertidal soft bottom polychaetes in the Levant Basin.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

CONDITIONS OF HILLING HABITAT OF CHELONIA MYDAS (GREEN TURTLE) IN PANGUMBAHAN BEACH UJUNG GENTENG, SUKABUMI SELATAN

2019 ◽  
Vol 1 (02) ◽  
pp. 64-67
Author(s):  
Meilisha Putri Pertiwi ◽  
Suci Siti Lathifah
Keyword(s):  
Data Collection ◽  
Surface Temperature ◽  
Green Turtle ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Chelonia Mydas ◽  
Nesting Habitat ◽  
Beach Width ◽  
The Many ◽  
Pandanus Tectorius

Research on the condition of the nesting habitat of Chelonia mydas (green turtle) in Pangumbahan Beach, Ujung Genteng, South Sukabumi has been carried out. Data retrieval is done 6 times for 2 days, 27-28 November 2017 at 3 observation stations. The abiotic parameters measured include surface temperature and depth of 50 cm, surface humidity and depth of 50 cm, beach width, beach slope, and the size of sand grains. While the biotic parameters measured were density, relative density, the frequency of attendance, and distribution patterns of Pandanus tectorius (sea pandanus) vegetation. Based on the results of data processing, the biophysical conditions in Pangumbahan Beach are still suitable for the Chelonia mydas nesting habitat. It also got clear evidence of the many Chelonia mydas landings during the data collection.

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