Y. Yusa

Publications106
h-index27
Citations1,983
Highly Influential Citations99
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Predatory Potential of Freshwater Animals on an Invasive Agricultural Pest, the Apple Snail Pomacea canaliculata (Gastropoda: Ampullariidae), in Southern Japan
TLDR
Predatory activities of various animals living in Japanese freshwater habitats are studied, by keeping each individual of a potential predator species with 36 snails of various sizes for three days in the aquarium, to find out why this snail maintains large populations in paddy fields but not in other freshwater habitats.
Insights from an Integrated View of the Biology of Apple Snails (Caenogastropoda: Ampullariidae)
TLDR
The great majority of the work to date concerns a single species, Pomacea canaliculata, which the authors see as having the potential to become a model organism in a wide range of fields, however, additional comparative data are essential for understanding this diverse and potentially informative group.
Adaptive evolution of sexual systems in pedunculate barnacles
TLDR
Both dwarf males and females are associated with a higher proportion of solitary individuals in the population, corroborating the hypothesis that limited mating opportunities have favoured evolution of these diverse sexual systems, which have puzzled biologists since Darwin.
Density-dependent growth and reproduction of the apple snail, Pomacea canaliculata: a density manipulation experiment in a paddy field
TLDR
The results suggest that snail density after the overwintering period is independent of the density in the previous year, and density dependence in growth and reproduction might regulate the population of P. canaliculata in paddies.
Impact of the introduction of apple snails and their control in Japan
The apple snail, Pomacea canaliculata, was imported into Japan and cultured extensively for food in the early 1980s. Not long after, escaped or discarded snails became feral and started feeding on…
Causes of variation in sex ratio and modes of sex determination in the Mollusca—an overview*
TLDR
The mechanisms for variation in the primary and apparent sex ratios, from both theoretical and empirical perspectives, are reviewed and it is suggested that the mechanism responsible for this pattern is oligogenic sex determination, i.e., sex determination by a small number of genes.
Effects of food availability and age on the reproductive effort of the apple snail, Pomacea canaliculata (Lamarck) (Gastropoda: Ampullariidae)
The effects of food availability and age on the reproductive traits of Pomacea canaliculata were determined in snails fed at three food levels under laboratory conditions (14L:10D; 25°C). In males,…
THE EFFECTS OF BODY SIZE ON MATING FEATURES IN A FIELD POPULATION OF THE HERMAPHRODITIC SEA HARE APLYSIA KURODAI BABA, 1937 (GASTROPODA: OPISTHOBRANCHIA)
  • Y. Yusa
  • Biology, Environmental Science
  • 26 August 1996
TLDR
The greater advantage of large size in mating as females, than as males, means that sexual selection at mate determination acts more strongly on female size than on male size and that the direction of totalSexual selection at mating is probably reversed in this hermaphrodite.
INHERITANCE OF COLOUR POLYMORPHISM AND THE PATTERN OF SPERM COMPETITION IN THE APPLE SNAIL POMACEA CANALICULATA (GASTROPODA: AMPULLARIIDAE)
TLDR
The mode of inheritance of body colour polymorphism (yellow or brown) was studied in the apple snail Pomacea canaliculata and, using the yellow colour as a genetic marker, the pattern of sperm competition was investigated.
Identification of photosynthetic sacoglossans from Japan
TLDR
This survey found 8 new species that have active chlorophylls, judged by the parameter Fv/Fm, an indicative of the functionality of photosystem II, and strongly suggest that these species possess kleptoplasts.
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