Morphology and life cycle of a new loriciferan from the Atlantic coast of Florida with an emended diagnosis and life cycle of Nanaloricidae (Loricifera)

2007 ◽  
Vol 126 (2) ◽  
pp. 120-137 ◽  
Author(s):  
Reinhardt Møbjerg Kristensen ◽  
Iben Heiner ◽  
Robert P. Higgins
Keyword(s):  
Life Cycle ◽  
Atlantic Coast ◽  
Emended Diagnosis

Nematodes associated with damage in oilseed rape: new data on the biology and geographical distribution of Meloidogyne artiellia

Nematology ◽  
2014 ◽  
Vol 16 (2) ◽  
pp. 201-206
Author(s):  
Alain Buisson ◽  
Andre Chabert ◽  
Laurent Ruck ◽  
Sylvain Fournet
Keyword(s):  
Life Cycle ◽  
Oilseed Rape ◽  
Atlantic Coast ◽  
Parasitic Nematodes ◽  
Paris Basin ◽  
Plant Parasitic Nematodes ◽  
Mediterranean Species ◽  
Climate Conditions ◽  
Development Stages ◽  
Plant Parasitic

For several years, patches of plants presenting deficiencies in growth have been observed in fields cultivated with oilseed rape. Over 3 years, 57 pairs of damaged and undamaged plants were sampled from cultivated fields on the Atlantic coast of France and around the Paris basin. Results show that two main species of plant-parasitic nematodes can be associated with the patches, Heterodera cruciferae and Meloidogyne artiellia, and that both species probably do not occur in the same fields and regions. This means that M. artiellia, which is considered as a Mediterranean species causing damage essentially on wheat, is also well adapted to colder climate conditions and can extensively damage oilseed rape. Monitoring the different development stages of M. artiellia in a field cultivated with oilseed rape provided more information about the life cycle and showed that only one generation can develop between the sowing in autumn and April.

scholarly journals Spatiotemporal patterns of phenology of the alien Phaeophyceae Sargassum muticum on the Atlantic coast of Morocco

2021 ◽  
Vol 85 (2) ◽  
pp. 103-111
Author(s):  
Samir El Atouani ◽  
Zahira Belattmania ◽  
Soukaina Kaidi ◽  
Aschwin H. Engelen ◽  
Ester A. Serrão ◽  
...  
Keyword(s):  
Life Cycle ◽  
Atlantic Coast ◽  
Early Summer ◽  
Spatiotemporal Patterns ◽  
Sargassum Muticum ◽  
Growth Phases ◽  
Sandy Bottom ◽  
Body Depth ◽  
Rocky Substratum ◽  
High Elongation

The present study focused on the dynamics of the phenology and life cycle of the Phaeophyceae invader Sargassum muticum at three sites on the Atlantic coast of Morocco over a period of two years (2013 and 2014). The results showed that S. muticum has two distinct growth phases; one with slower growth in winter followed by one with faster growth in spring-early summer, when the species exhibited high elongation and branching activities with thalli length ranging from 1 to more than 5 m depending on the study site. The site S1, with a rocky substratum covered by submerged sands, promotes thalli elongation, with maximum lengths of 643.33 11.10 cm recorded in July. At the rocky sites (S2 and S3), the maximum length of the seaweed depends on the pools’ depth. Although the elongation of thalli is enhanced by the water body depth, the settlements’ density (5-48 ind. m–2) seems to be mainly related to the nature of the substrate. The maturity index progressively increases from spring to early summer, when it reaches the highest values. S. muticum seems to be more abundant and more easily acclimated in shallow rockpools (sufficiently lighted and semi-exposed to wave action at the mid and lower tidal levels) than in protected sandy bottom sites with low hydrodynamic forces.

The seasonal abundance of four species of Stauromedusae (Coelenterata: Scyphomedusae) at Plymouth

1979 ◽  
Vol 59 (2) ◽  
pp. 385-391 ◽  
Author(s):  
P. G. Corbin
Keyword(s):  
Life Cycle ◽  
Atlantic Coast ◽  
Seasonal Abundance ◽  
Population Changes ◽  
The West ◽  
Annual Population

Annual population changes of four species of Stauromedusae at Plymouth are described. Three of these, Haliclystus auricula, Lucernariopsis campanulata and L. cruxmelitensis, have one generation in a year; Craterolophus convolvulus has two. The completion of the life-cycle of the four Plymouth species within a year is in agreement with Berril's (1962) studies of three species on the west Atlantic coast and with a reinterpretation of Sars's (1846) observations on Lucernaria quadricomis on the coast of Norway.

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

1993 ◽  
Vol 51 ◽  
pp. 346-347
Author(s):  
Randolph W. Taylor ◽  
Henrie Treadwell
Keyword(s):  
Plasma Membrane ◽  
Life Cycle ◽  
Growth Phase ◽  
Filter Paper ◽  
Physarum Polycephalum ◽  
Freeze Fracture ◽  
Petri Dish ◽  
Wire Screen ◽  
Wide Mouth ◽  
Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

A Spreadsheet Life Cycle Cost Model for System Modernization Studies

1994 ◽  
Vol 11 (1) ◽  
pp. 47-56
Author(s):  
Virginia C. Day ◽  
Zachary F. Lansdowne ◽  
Richard A Moynihan ◽  
John A. Vitkevich
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Cost Model
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