A New Population of the Amphioxus (Branchiostoma belcheri) in the Enshu-Nada Sea in Japan

Kubokawa, Kaoru; Azuma, Nobuyuki; Tomiyama, Minoru

doi:10.2108/zsj.15.799

Cited by 30 publications

(20 citation statements)

References 7 publications

(12 reference statements)

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“…This reinforces the suggestion that spawning may have occurred in late MayeJune and that the recruitment period would follow through JuneeOctober, where it achieves maximum abundances. Similar behavior has been observed with the Florida amphioxus, Branchiostoma floridae, with a breeding season from early May to early September and new lancelet juveniles from late May through mid-October (Stokes, 1996; Table 1), and with the east-Asian amphioxus, Branchiostoma belcheri, which also showed a breeding season from June to August concentrating large number of juveniles in September (Kubokawa et al, 1998;Yamaguichi and Henmi, 2003; Table 1). It was not possible to determine the life span of B. lanceolatum.…”

Section: Branchiostoma Lanceolatumsupporting

confidence: 70%

Population structure and species dynamics of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum along a temporal–spatial gradient in the south coast of Portugal

Dolbeth¹,

Viegas²,

Martinho³

et al. 2006

Estuarine, Coastal and Shelf Science

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The population structure, dynamics and distribution of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum, common species in the south coast of Portugal, were studied in a spatialetemporal manner in order to understand the influence of cross-shore sediment transport and anthropogenic activities. Spisula solida is harvested commercially, whereas D. pugilator and B. lanceolatum are non-target species, with little information available on the population dynamics of these species. The study was performed in 2001e2002, and along a gradient of 100e5000 m from the coastline, corresponding to a depth gradient of between 1 and 32 m deep. Spisula solida was distributed preferentially at 3e12 m deep, and its distribution appeared to be influenced seasonally by the cross-shore sediment dynamics. Results suggested benthic recruitment in June. Some recruitments had no expression (year 2001) since adults were not present, which seems to be a direct impact of clams' fisheries. Diogenes pugilator showed preferential distribution at shallow depths, from 1.3 to 8 m. Results suggested recruitments every 4 months, in June, February and October. Branchiostoma lanceolatum showed the widest distribution, from 7 to 26 m deep. Recruitment seemed to start in June until October, when it attained an abundance peak of juveniles. For both non-target species no clear effects of the cross-shore dynamics or the clams' fisheries impact were visible.

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Section: Branchiostoma Lanceolatumsupporting

confidence: 70%

Population structure and species dynamics of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum along a temporal–spatial gradient in the south coast of Portugal

Dolbeth¹,

Viegas²,

Martinho³

et al. 2006

Estuarine, Coastal and Shelf Science

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“…Adult amphioxus, Branchiostoma belcheri , were collected from the Enshu‐nada Sea, Japan (Kubokawa et al, '98) and from Tsuyazaki, near the Fishery Research Laboratory of Kyushu University, Japan. Note that Zhang et al (2006a,b) showed evidences that B. belcheri actually consists of two distinct species, and according to their classification our specimens are B. japonicum .…”

Section: Methodsmentioning

confidence: 99%

Regeneration of amphioxus oral cirri and its skeletal rods: implications for the origin of the vertebrate skeleton

Kaneto

Wada

2011

J Exp Zool Pt B

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The oral cirri of amphioxus function as the first filter during feeding by eliminating unwanted large or noxious particulates. In this study, we were able to regenerate cirri following artificial amputation. This is the first firm observation of regeneration in amphioxus. Using this regeneration system, we studied skeletogenesis of the cellular skeleton of amphioxus oral cirri. During regeneration, the skeletal cells showed expression of fibrillar collagen and SoxE genes. These observations suggest that an evolutionarily conserved genetic regulatory system is involved in amphioxus cirrus and vertebrate cartilage skeletogenesis. In addition, Runx and SPARC/osteonectin expression were observed in regenerating cirral skeletal cells, indicating that cirral skeletogenesis is similar to vertebrate osteogenesis. We propose that the common ancestors of chordates possessed a genetic regulatory system that was the prototype of chondrogenesis and osteogenesis in vertebrates. Genome duplications caused divergence of this genetic regulatory system resulting in the emergence of cartilage and mineralized bone. The development of the vertebrate skeleton is an example of the functional segregation and subsequent recruitment of unique genetic materials that may account for the evolutionary diversification of novel cell types.

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“…Belonging to the subphylum Cephalochordata, lancelets share key anatomical and developmental features with vertebrates and tunicates and have proved crucial in understanding the morphology and evolution of chordates in general. In contrast, the main aspects of the population ecology of most species are poorly known (Chen et al, 2008) in spite that: (i) they may play an important role in marine food webs by transferring substantial amounts of microbial production to higher trophic levels (Chen, 2007); and (ii) the conservation status of some populations have already been considered under the category of endangered species (Kubokawa et al, 1998). Putnam et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Population dynamics of the amphioxus Branchiostoma elongatum from northern Chile

2011

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Amphioxi represent the evolutionary link between vertebrates and invertebrates. For this reason, research dealing with these animals has been focused mainly on embryological and anatomical studies. Out of 30 described species, only one, Branchiostoma elongatum, is known to inhabit shallow sandy bottoms along the Humboldt Current System (HCS) of Chile and Peru. The population dynamics of B. elongatum from northern Chile was studied between February 2008 and January 2009, and the results were compared with other species within the genus Branchiostoma inhabiting distinct ecosystems. Mean abundance of B. elongatum was low (158.6 ind m 22 ) in comparison with the abundance of other species within Branchiostoma. Although the gametogenic activity was continuous, a clear spawning event was observed between August and October, which seemingly produced a recruitment pulse during the summer and consequently a simultaneous increase in population density and decrease of mean length during that period. Growth of B. elongatum was best fitted to the seasonalized von Bertalanffy growth function (K ¼ 0.45 year 21 and L 1 ¼ 64.6 mm), with faster growth during summer -autumn. Growth performance (V ′ ¼ 3.273) was high in comparison with other species within the genus. Mortality of B. elongatum (Z ¼ 1.075 year 21 ) was well fitted to the single exponential model (r 2 ¼ 0.92). The annual total production of B. elongatum reached 0.68 g ash-free dry mass (AFDM) m 22 and the annual mean biomass was 0.56 g AFDM m 22 , which determined a production to biomass ratio of 1.22. The huge productivity of the HCS was not reflected in a high abundance and biomass of B. elongatum. However, this species displayed a high growth efficiency and P/B ratio that are comparable to those of other Branchiostoma inhabiting highly productive ecosystems.

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A New Population of the Amphioxus (Branchiostoma belcheri) in the Enshu-Nada Sea in Japan

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 30 publications

References 7 publications

Population structure and species dynamics of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum along a temporal–spatial gradient in the south coast of Portugal

Population structure and species dynamics of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum along a temporal–spatial gradient in the south coast of Portugal

Regeneration of amphioxus oral cirri and its skeletal rods: implications for the origin of the vertebrate skeleton

Population dynamics of the amphioxus Branchiostoma elongatum from northern Chile

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