scholarly journals Effects of temperature and interspecific competition on population fitness of free-living marine nematodes

2021 ◽  
Vol 120 ◽  
pp. 106958 ◽  
Author(s):  
Anna-Maria Vafeiadou ◽  
Tom Moens
Keyword(s):  
Interspecific Competition ◽  
Marine Nematodes ◽  
Free Living ◽  
Effects Of Temperature ◽  
Population Fitness

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

Observations on the free-living stages of the stomach worm Haemonchus contortus

Parasitology ◽  
1963 ◽  
Vol 53 (3-4) ◽  
pp. 469-481 ◽  
Author(s):  
J. H. Rose
Keyword(s):  
Haemonchus Contortus ◽  
Free Living ◽  
Rate Of Development ◽  
Temperature And Humidity ◽  
Survival And Development ◽  
Effects Of Temperature ◽  
Eggs And Larvae ◽  
Heavy Mortality

Outdoor observations were made on the rate of development of the free-living stages of H. contortus at different times of the year, and on the migratory activities and longevity of the larvae in faeces, on herbage and in soil.The effects of temperature and humidity on the survival and development of eggs and larvae, both in faeces and when separated from the faeces, were studied in the laboratory.The results of these observations are discussed in relation to the heavy mortality of the free-living stages of H. contortus and to the transmission of infection in the field.

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.

Investigations into the free-living phase of the life-cycle of Nematodirus helvetianus

Parasitology ◽  
1966 ◽  
Vol 56 (4) ◽  
pp. 679-691 ◽  
Author(s):  
J. H. Rose
Keyword(s):  
Life Cycle ◽  
Technical Assistance ◽  
Free Living ◽  
Temperature And Humidity ◽  
Effects Of Temperature

The free-living phase of the life-cycle of Nematodirus helvetianus was studied out of doors on grass plots and the effects of temperature and humidity on the free-living stages were studied in the laboratory. The results of these observations are discussed in relation to the bionomics of N. battus and N. filicollis, and tentative deductions made regarding the epidemiology of N. helvetianus infection.I wish to thank Mr J. Bailey for technical assistance.

Sign in / Sign up

Export Citation Format

Share Document