Influence of egg lipids and fatty acids on egg viability, and their utilization during embryonic development of spotted wolf-fish, Anarhichas minor Olafsen

The influence of a developing bird embryo on eggshell thinning is well known, however this phenomenon has been described mainly for poultry, and in wild birds is poorly understood. This study focussed on Capercaillie ( Tetrao urogallus), in which the effect of a developing embryo on the change of eggshell thickness has not been described. However, problems relating to a large number of dead embryos and eggs cracking during incubation are observed in captive breeding centres giving us the opportunity to test how the developing embryo affects the eggshell and thereby its properties, including eggshell strength and thickness. In total, 196 unhatched eggs, including 146 infertile and 50 eggs with embryos which died at various stages of development, were analysed in relation to eggshell shape, thickness and strength. Moreover, 102 posthatched eggshells were also examined. Although the strength of eggshell was affected by egg shape and shell thickness, contrary to expectations, the stage of embryonic development had no significant influence on eggshell strength. As has been demonstrated in other species, etching of eggshells by the developing embryo reduces shell thickness in Capercaillie but it has minimal effect on the strength of the eggshell. Egg viability is not compromised during the later stages of development by contact incubation with the female. The eggshell of infertile eggs or eggs containing early-dead embryos were 10% thicker than posthatched eggshells and eggs with late-dead embryos, confirming that eggshell thinning in Capercaillie is typical for precocial species.

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THE ROLE OF FATTY ACIDS IN EMBRYONIC DEVELOPMENT (REVIEW)

Bulletin physiology and pathology of respiration ◽

10.12737/article_5b985a4bcfb950.60653849 ◽

2018 ◽

Vol 1 (69) ◽

pp. 107-114

Author(s):

Наталия Ишутина ◽

Nataliya Ishutina

Keyword(s):

Fatty Acids ◽

Embryonic Development ◽

Plastic Material ◽

Lung Surfactant ◽

Physiological Role ◽

Nerve Tissue ◽

Erythrocyte Membranes ◽

Visual Analyzer ◽

Functional Development

The review provides information on the physiological role of medium-chain saturated and unsaturated (myristic, pentadecanoic) and long-chain (palmitic, stearic, oleic) fatty acids in embryonic development. The value of fatty acids in the formation of the lung surfactant of the developing fetus is shown. There is presented the information about the role of polyunsaturated acids of arachidonic and docosahexaenoic ω-6 family in the structural and functional development of the nervous system and the visual analyzer of the fetus and the newborn. The interdependent stimulating effect of unsaturated oleic and linoleic fatty acids on the differentiation of muscle cells is shown; the role of oleic and acids with 20 carbohydrate atoms in the mineralization of bone tissue is demonstrated; the value of oleic acid in the regulation of placental transport of amino acids through tol-like receptors 4 and cellular signaling is presented. The above mentioned factors allow drawing the conclusion about the need for further study of lipids as the main energy substrates, sources of plastic material, structural components of erythrocyte membranes, nerve tissue, visual analyzer, pulmonary surfactant and skeletal muscles. The accumulated data broadens the understanding of the role of lipids in metabolic processes, which will allow us to move from a fundamental research to practical aspects of the use of these substances in obstetrics and perinatology. In the long term, these results can be used to interpret and predict changes in metabolic disorders of lipids in various pathological conditions during pregnancy.

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Fatty acids dynamics during embryonic development in genus Uca (Brachyura: Ocypodidae), from the mangroves of Inhaca Island, Mozambique

Estuarine Coastal and Shelf Science ◽

10.1016/j.ecss.2008.07.018 ◽

2008 ◽

Vol 80 (3) ◽

pp. 307-313 ◽

Cited By ~ 13

Author(s):

Paulo Torres ◽

Gil Penha-Lopes ◽

Luís Narciso ◽

Adriano Macia ◽

José Paula

Keyword(s):

Fatty Acids ◽

Embryonic Development

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Quiescence in Aedes aegypti: Interpopulation Differences Contribute to Population Dynamics and Vectorial Capacity

Insects ◽

10.3390/insects9030111 ◽

2018 ◽

Vol 9 (3) ◽

pp. 111 ◽

Cited By ~ 4

Author(s):

Luciana Oliva ◽

Roseli La Corte ◽

Marcelo Santana ◽

Cleide Albuquerque

Keyword(s):

Population Dynamics ◽

Embryonic Development ◽

Aedes Aegypti ◽

Development Time ◽

Mosquito Species ◽

Vectorial Capacity ◽

Control Measures ◽

Adult Size ◽

Egg Viability ◽

Male Predominance

The strategy of Aedes aegypti to prolong embryonic viability by quiescence has severe implications for geographic expansion and maintenance of mosquito populations in areas under control measures. We evaluated the effects of quiescence on biological parameters directly or indirectly associated with population dynamics and vectorial capacity in populations of this mosquito species from two Brazilian municipalities characterized as dengue, chikungunya, and Zika transmission areas. Egg viability, initial hatching time, post-embryonic development time, adult emergence rate, sexual proportion, adult size, fecundity, and fertility were analyzed using eggs stored for 10, 40, 70, 100, 130, and 160 d. Quiescence time reduced overall egg viability and post-embryonic development time in both municipalities but was more costly in Aracaju (100 d, 8 d) than in Recife (130 d, 7.5 d). Emergence rates increased in Recife when the eggs were older, but not in Aracaju. Significant deviations in sexual proportion, with male predominance, were observed in both populations. Initial hatch, fecundity, fertility, and adult size did not significantly influence egg quiescence time. These results indicate intrinsic and differential characteristics for each A. aegypti population, suggesting a differential cost of quiescence for population dynamics parameters that can indirectly affect vectorial capacity and control measures.

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