scholarly journals Increased biomass of free-living marine nematodes may be indicative of disturbances in the ecosystem of the San Antonio bay

2020 ◽  
Vol 5 (1) ◽  
pp. 001-006
Author(s):  
Villares Gabriela ◽  
de Ward Catalina Pastor
Keyword(s):  
San Antonio ◽  
Marine Nematodes ◽  
Free Living

Two new species of free-living marine nematodes of the family Oxystominidae Chitwood, 1935 (Enoplida) with a review of the genus Thalassoalaimus de Man, 1893 from the Argentine coast 

Zootaxa ◽  
2017 ◽  
Vol 4250 (4) ◽  
pp. 347
Author(s):  
ANTONELA MARTELLI ◽  
VIRGINIA LO RUSSO ◽  
GABRIELA VILLARES ◽  
CATALINA T. PASTOR DE WARD
Keyword(s):  
New Species ◽  
San Antonio ◽  
Marine Nematodes ◽  
San Jose ◽  
Key To Species ◽  
Free Living ◽  
Rio Negro ◽  
The Family ◽  
Two New Species ◽  
De Man

Two new free-living marine nematodes of the family Oxystominidae are described from San Antonio Bay (Río Negro) and San José Gulf (Chubut). Litinium australis sp. n., is characterized by having a rounded tail, by the first and second crown of cephalic setae with different lengths, gubernaculum with apophysis and by the presence of at least four precloacal papillae; Thalassoalaimus nestori sp. n., is characterized by having a conical tail, cephalic setae equal in length, gubernaculum with rounded and dorso-caudally directed apophysis and two precloacal papillae. An emended diagnosis of the genus Thalassoalaimus and a key to species are given. 

scholarly journals Free-living marine nematodes from San Antonio Bay (Río Negro, Argentina)

ZooKeys ◽  
2016 ◽  
Vol 574 ◽  
pp. 43-55
Author(s):  
Gabriela Villares ◽  
Virginia Lo Russo ◽  
Catalina Pastor de Ward ◽  
Viviana Milano ◽  
Lidia Miyashiro ◽  
...  
Keyword(s):  
San Antonio ◽  
Marine Nematodes ◽  
Free Living ◽  
Rio Negro

New Records of Free-Living Marine Nematodes (Nematoda: Enoplida) from East Coast of India

2012 ◽  
Vol 2 (11) ◽  
pp. 517-520
Author(s):  
VIJAYA BHANU, CH VIJAYA BHANU, CH ◽  
◽  
ANNAPURNA, C ANNAPURNA, C ◽  
SRINIVASA RAO, M SRINIVASA RAO, M ◽  
SIVA LAKSHMI, M. V SIVA LAKSHMI, M. V ◽  
...  
Keyword(s):  
East Coast ◽  
New Records ◽  
Marine Nematodes ◽  
Free Living ◽  
East Coast Of India

scholarly journals Toxicity of hydroxychloroquine, a potential treatment for COVID-19, on free-living marine nematodes

2021 ◽  
pp. 112361
Author(s):  
Manel Ben Ali ◽  
Amor Hedfi ◽  
Mohammed Almalki ◽  
Paraskevi K. Karachle ◽  
Fehmi Boufahja
Keyword(s):  
Potential Treatment ◽  
Marine Nematodes ◽  
Free Living

Spatial aggregation patterns of free-living marine nematodes in contrasting sandy beach micro-habitats

2010 ◽  
Vol 91 (3) ◽  
pp. 615-622 ◽  
Author(s):  
Ruth Gingold ◽  
Silvia E. Ibarra-Obando ◽  
Axayácatl Rocha-Olivares
Keyword(s):  
Negative Correlation ◽  
Sandy Beach ◽  
Distribution Patterns ◽  
Significant Negative Correlation ◽  
Small Scale ◽  
Spatial Distributions ◽  
Biological Processes ◽  
Marine Nematodes ◽  
Free Living ◽  
Biological Similarity

In the absence of chemical or physical gradients, random displacement of organisms can result in unpredictable distribution patterns. In spite of a limited locomotive capability, marine nematodes may choose where to settle after re-suspension and may maintain their position in the sediment under calm conditions, leading to small-scale (<1 m) spatial variability. However, in more energetic environments, nematodes become re-suspended with sediments and re-distributed at distances dependent on prevalent hydrodynamic regimes, from metre- to decametre-scale or more. In this study, we tested the hypothesis that micro-habitats (i.e. runnels and sandbars) in a macrotidal sandy beach influence the distribution patterns of free-living marine nematodes by exhibiting contrasting hydrodynamic regimes. Specifically, we predicted patchier distributions in the calmer environment (runnel). We sampled nematodes in each habitat from <1 m to decametre scales. Our results show more heterogeneous spatial distributions in the runnel, presumably owing to a predominance of active displacement under calmer conditions and sediment cohesion by algal films. Biological similarity among runnel replicates was low, whereas replicates from the sandbar exhibited higher similarity, presumably because of homogenization of the sediment and inhabiting fauna by tidal currents. A significant negative correlation between biological similarity and sampling distance was found in the runnel, but not in the sandbar. The most similar samples were the closest in the runnel and the most distant in the sandbar. More patchily distributed taxa were found in the runnel and a larger fraction of homogeneously or randomly distributed taxa in the sandbar. We conclude that different hydrodynamic regimes in contrasting intertidal micro-habitats significantly influenced the nematofaunal distribution, resulting in different spatial patterns next to one another in the same beach. This has significant implications for sampling and monitoring designs and begs the need for detailed studies about the physical and biological processes governing meiobenthic communities.

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