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Future climate extreme events in the Mediterranean simulated by a Regional Climate Model
DEVELOPMENTAL PATTERN AND ADAPTATIONS FOR REPRODUCTION IN NUCELLA CRASSILABRUM AND OTHER MURICACEAN GASTROPODS.
- C. Gallardo
- Biology, Environmental ScienceThe Biological bulletin
- 1 December 1979
Pre-hatching time and hatching size data of various muricaceans are analyzed to determine to what extent they influence embryonic mode of nutrition, namely the presence of nurse-eggs or alternatively large and fertile self-sufficient eggs.
Two modes of development in the morphospecies Crepidula dilatata (Gastropoda: Calyptraeidae) from Southern Chile
- C. Gallardo
- Biology, Environmental Science
Two sympatric sibling species with different modes of development are present in the morphospecies C. dilatata Lamarck in Southern Chile, and two possible interpretations are considered: intrapopulation variation of developmental pattern in a species, and the coexistence of two sibling species.
Imposex in Three Marine Gastropod Species in Chile and Potential Impact on Muriciculture
Egg laying and embryonic-larval development in the snail Thais (Stramonita) chocolata (Duclos, 1832) with observations on its evolutionary relationships within the Muricidae
Paleobiological data reported for Neogastropoda allow postulation of primitiveness in planktotrophic larval development compared to more recent developmental strategies such as direct development of different types, which characterize various clades of this family.
EMBRYONIC AND LARVAL DEVELOPMENT OF THE MURICID SNAIL CHORUS GIGANTEUS (LESSON, 1829) WITH AN ASSESSMENT OF THE DEVELOPMENTAL NUTRITION SOURCE
Preliminary estimates of size and number of their encapsulated eggs support the assumption of lecithotrophic development mediated by the provision of extraembryonic nurse eggs, and confirm the occurrence of nurse eggs that are ingested by the early encapsulated embryos, indicating that the snails develop through a yolk-supported (lecithOTrophic) type of development.
Nutritive Egg Formation in the Marine Snails Crepidula dilatata and Nucella crassilabrum
These findings suggest that, at least in C. dilatata, the mechanisms of nutritive egg formation reside in properties of the oocyte, and that this snail's dimorphic eggs are not correlated with the fate of these cells.
Influence of diet and temperature on physiological energetics of Chorus giganteus (Gastropoda: Muricidae) during reproductive conditioning
Diet and temperature both played key roles in the physiological energetic and reproductive conditioning of Chorus giganteus, and reproductive effort, measured as the proportion of the total energy budget of an organism that is allocated to reproduction, was highest at 18°C with a Tagelus diet.
Ultrastructure of sperms in bivalve molluscs of the Mytilidae family
The sperm structure of five external fertilizing bivalve molluscs pertaining to the Mytilidae family is compared to see if such gamete structure conforms to the primitive sperm form of the type I predicted by Franen.
Morphological analysis of two sympatric ecotypes and predator-induced phenotypic plasticity in Acanthina monodon (Gastropoda: Muricidae)
It is suggested that adaptive phenotypic plasticity may account for part of the shell variation surveyed in the field, and the metabolic and reproductive costs of maintaining antipredator defence strategies that involve adaptive morphological changes to a particular environment are discussed.