scholarly journals Spatial and temporal variation in benthic macrofauna and relationships with environmental variables in an estuarine, intertidal soft-sediment environment

2002 ◽  
Vol 244 ◽  
pp. 105-124 ◽  
Author(s):  
T Ysebaert ◽  
PMJ Herman
Keyword(s):  
Temporal Variation ◽  
Environmental Variables ◽  
Benthic Macrofauna ◽  
Spatial And Temporal Variation ◽  
Soft Sediment

Fish composition in a south-western Atlantic temperate coastal lagoon: spatial–temporal variation and relationships with environmental variables

2009 ◽  
Vol 89 (3) ◽  
pp. 593-604 ◽  
Author(s):  
M. González Castro ◽  
J.M. Díaz de Astarloa ◽  
M.B. Cousseau ◽  
D.E. Figueroa ◽  
S.M. Delpiani ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Coastal Lagoon ◽  
Environmental Variables ◽  
Mesh Size ◽  
High Abundance ◽  
Spatial And Temporal Variation ◽  
Salinity Range ◽  
Buenos Aires Province ◽  
Western Atlantic ◽  
Odontesthes Argentinensis

Mar Chiquita, an irregularly shaped brackish-water coastal lagoon, is located in the Buenos Aires province of Argentina and considered since 1996 by the Coordination Council of the Man and Biosphere Program of UNESCO as a World Reserve of Biosphere. The present paper aims to study both the spatial and temporal variation of fish composition in this coastal lagoon and the influence of some environmental variables on the relative abundance of the main fish species. Monthly sampling surveys over a two-year period in three different areas were conducted, using a beach-seine net and three monofilament-gill nets with different mesh size. Twenty-eight species belonging to four bio-ecological categories were identified, five of them are new records for Mar Chiquita fish community. The correspondence analysis showed strong relationships between high salinity range and the abundance of Brevoortia aurea, Cynoscion guatucupa and Pomatomus saltatrix. Conversely, low salinity range corresponded to high abundance of Mugil platanus and Odontesthes argentinensis. High temperatures were corresponded with abundance of Micropogonias furnieri and Brevoortia aurea. In contrast, high abundance of both Odontesthes argentinensis and Oligosarcus jenynsii were corresponded to low temperatures. Brevoortia aurea, Mugil platanus and Odontesthes argentinensis were the most abundant species, representing more than 80% of the total capture. The group of estuarine-nondependent-marine fish presented the highest species richness. Estuarine-dependent-marine species presented for both juveniles and adults specimens the highest abundance values.

scholarly journals Temporal and spatial variation of limnological variables and biomass of different macrophyte species in a Neotropical reservoir (São Paulo - Brazil)

2013 ◽  
Vol 25 (4) ◽  
pp. 387-397 ◽  
Author(s):  
Flávia Bottino ◽  
Maria do Carmo Calijuri ◽  
Kevin Joseph Murphy
Keyword(s):  
Spatial Variation ◽  
Temporal Variation ◽  
Environmental Variables ◽  
Plant Distribution ◽  
Pistia Stratiotes ◽  
Spatial And Temporal Variation ◽  
Trophic State Index ◽  
Water And Sediment ◽  
Inorganic Substances ◽  
Eichhornia Azurea

AIM: This study reports an investigation of limnological characteristics and aquatic macrophyte occurrence in a neotropical reservoir in order to assess the spatio-temporal variation of water and sediment variables and their influence on plant distribution. METHODS: Macrophytes, water and sediment samples were collected from a Brazilian reservoir in different seasons from four main arms of the reservoir. In total sixteen water-sediment variables were analyzed including N:P ratio and Trophic State Index. The plants were collected using a quadrat sampling procedure and the dry weight per sample was measured. MANOVA was performed to evaluate spatial and temporal variation of environmental variables as well as seasonal biomass differences. To assess the relationship among environmental variables and macrophytes an ordination analysis (using Canonical Correspondence Analysis: CCA) was carried out. RESULTS: The spatial and temporal variation of limnological variables generated a heterogeneous system which supports the presence of different species of macrophyte. pH, dissolved oxygen and sediment composition were important predictors of Polygonum lapathifolium occurrence while nutrients were associated with Eichhornia crassipes and Pistia stratiotes. Inorganic substances were related to biomass variation of Eichhornia azurea and Myriophyllum aquaticum. CONCLUSIONS: The spatial variation of the environmental variables has caused heterogeneity in the reservoir and it may support the occurrence of different species of macrophyte. Limnological variables highlighted in CCA are important to predict the species occurrence and their control in the study area.

A new species ofSyllis(Polychaeta: Syllidae: Syllinae) from off Fortaleza, north-eastern Brazil

2008 ◽  
Vol 88 (7) ◽  
pp. 1391-1399 ◽  
Author(s):  
João Miguel de Matos Nogueira ◽  
Gustavo Yunda-Guarin
Keyword(s):  
New Species ◽  
Temporal Variation ◽  
Domestic Sewage ◽  
Benthic Macrofauna ◽  
Cutting Edge ◽  
Spatial And Temporal Variation ◽  
Anal Papilla ◽  
Eastern Brazil ◽  
North Eastern ◽  
A New Species

In a study investigating the composition and spatial and temporal variation of the benthic macrofauna associated to the discharge of domestic sewage off Fortaleza, north-eastern Brazil, a new species ofSylliswas found. This new species,S. guidaesp. nov., is characterized by having blades of falcigers with subdistal tooth about same length as distal tooth, but stouter than it, with spines on cutting edge almost reaching the tip of subdistal tooth, blades of falcigers with conspicuous subdistal triangular process and unusually long anal papilla between anal cirri, measuring about one-quarter of their length.Syllis guidaesp. nov., is herein described and compared with the most similar congeners.

Spatio-temporal variation of fish assemblages in Babai River of Dang district, Province No. 5, Nepal

Our Nature ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 19-30
Author(s):  
Punam G.C ◽  
Jash Hang Limbu
Keyword(s):  
Carbon Dioxide ◽  
Temporal Variation ◽  
Water Temperature ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Water Velocity ◽  
Free Carbon ◽  
Spatial And Temporal Variation ◽  
Fish Assemblage Structure ◽  
Free Carbon Dioxide

Spatial and temporal variation of fish assemblages were investigated seasonally from October 2018 to May 2019. Fish assemblages were agglomerated with environmental variables both to spatial and temporal scales. Water temperature, dissolved Oygen, free carbon-dioxide, pH and water velocity of water of each site were measured. Based on analysis of similarities (ANOSIM), fish assemblages were significantly different in spatial variation but not in temporal variation. A total of 1,024 individuals belonging to 5 orders, 9 families and 15 genera and 24 species were collected. The dominated species were Puntius sophore, followed by P. terio, P. ticto and Barilius bendelisis. The Redundancy Analysis (RDA) vindicated that environmental variables of water temperature, pH, water velocity and free carbon-dioxide were found to be contributed variables to shape the fish assemblage structure of Babai River. The cluster analysis delineated that similarity between fish species decreases as the distance of sites increased.

Complex spatial and temporal variation of subtropical benthic macrofauna under sewage impact

2016 ◽  
Vol 116 ◽  
pp. 61-70 ◽  
Author(s):  
F.M. Souza ◽  
K.M. Brauko ◽  
E.R. Gilbert ◽  
C.C. Martins ◽  
P.C. Lana ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Benthic Macrofauna ◽  
Spatial And Temporal Variation
Sign in / Sign up

Export Citation Format

Share Document