التفاصيل البيبلوغرافية
| العنوان: |
Lecithotrophic species and matrotrophic species among poeciliid fishes. |
| المؤلفون: |
Oroian, Ioan1 ioan.oroian@usamvcluj.ro, Kovacs, Eniko2 eniko.kovacs@usamvcluj.ro |
| المصدر: |
Poeciliid Research. 2022, Vol. 12 Issue 1, p34-38. 5p. |
| مصطلحات موضوعية: |
*ANIMAL clutches, *YOLK sac, *GENITALIA, *SPECIES, *MOTHERS, *VIVIPARITY, *EGGS |
| مستخلص: |
Our work aims to address the problem of embryo supply strategies with nutrients in poecilid fishes, as a variation of the reproductive strategy within a phylogenetically and taxonomically related group. Poeciliid fish are divided into two types based on their reproductive strategy: lecithotrophic and matrotrophic species. Lecithotrophic species lay eggs that contain a yolk sac that provides nutrients for the developing embryo. Once the egg is laid, the embryo relies on the yolk sac until it hatches and can feed on its own. Lecithotrophic species do not provide any additional nourishment to their offspring beyond what is already present in the egg. Matrotrophic species, on the other hand, provide additional nourishment to their offspring through a placenta-like structure. The developing embryos are attached to the mother's bloodstream via this structure and are able to receive nutrients directly from her. Matrotrophic species are further divided into two types: histotrophic and hemotrophic. Histotrophic species provide their offspring with nutrients from secretions in the female reproductive tract, while hemotrophic species provide their offspring with nutrients directly from the mother's blood. A high degree of matrotrophy allows the species to carry several broods at different stages of development, a phenomenon known as superfetation. Because the room for developing embryos is limited, viviparity reduces brood size compared to oviparous species. Superfetation can compensate for this loss by keeping embryos at various sizes and stages during development. The greater degree of matrotrophy in a species is linked with a higher degree of placentation, including a thicker maternal follicle, higher degree of vascularization, and larger number of villi in the placenta. The use of placental fish models has expanded our understanding of placental biology beyond mammals and has provided valuable insights into the mechanisms of placental development and function. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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