Learn More
Social structure of the protogynous angelfish, Centropyge ferrugatus, was examined on the coral reefs of Sesoko Island, Okinawa, Japan. Each individual male monopolized a harem of 1-6 females. Harems could be categorized as linear-type or branching-type based upon spatial and dominance relationships among the females. A linear harem consisted of(More)
Phylogenetic analyses were conducted using complete nucleotide sequences of the D-loop in the mitochondrial genome of Mola specimens, collected mainly in Japanese waters, to clarify the genetic features and distribution patterns of Mola sunfishes. Two significantly distinct groups (designated A and B) were present in the genus, with a considerable net(More)
To examine how a change in an individual's social status could influence its behavioural sex, we conducted male "removal-and-return" experiments in the polygynous wrasse, Halichoeres melanurus. This coral-reef fish is a protogynous hermaphrodite: the largest female (LF) living in a male's territory typically completes functional sex change within 2–3 weeks(More)
We designed a new inverse PCR protocol combined with switching mechanism at 5' end of RNA transcript (SMART) technology, and applied it to the cloning of teleost corticotropin-releasing hormone precursor cDNA. Due to the advantages of both techniques, this method can efficiently amplify the complete 5'- and 3'-ends of cDNA in a single reaction, and might(More)
The influence of predation risk on the opportunity for female mate choice was investigated in the tailspot wrasse Halichoeres melanurus at two sites on a coral reef in Okinawa, Japan. Females mated repeatedly with the nearest males, but they also changed mates frequently at both sites. Mate changes were seen not only in the context of spatiosocial changes(More)
M any reef fishes, such as wrasses, parrotfishes, groupers and angelfishes, spawn pelagic eggs into the water column (review in Thresher, 1984). The fecundity (reproductive effort) of these fishes has been estimated mostly from gonad weight or the number of mature eggs in the ovary (Feddern, 1965; Blaxter, 1969; Robertson and Warner, 1978; Warner and(More)
Feeding behavior of juvenile batfish Platax orbicularis, which presents a mimic state resembling a fallen leaf drifting on the water surface, were surveyed on reefs off Kuchierabu-jima Island, southern Japan. The fish consistently showed drifting swimming patterns on the surface during daylight hours, and fed in a picking–feeding manner on algae covering(More)
With the goal of developing a conversational humanoid that can serve as a companion for people with dementia, we propose an autonomous virtual agent that can generate backchannel feedback, such as head nods and verbal acknowledgement, on the basis of acoustic information in the user's speech. The system is also capable of speech recognition and language(More)
Protogynous hermaphroditism, female-to-male sex change, is well known among reef fishes where large males monopolize harems of females. When the dominant male disappears from a harem, the largest female may change sex within a few weeks. Recently, from experiments with some protogynous haremic fishes in which two males' cohabitated, it was confirmed that(More)