Reproduction and population structure of the sea urchin Heliocidaris crassispina in its newly extended range: The Oga Peninsula in the Sea of Japan, northeastern Japan

Ocean warming has facilitated the range expansion of commercially important sea urchin species to higher latitudes. Heliocidaris crassispina was recorded to extend northward to Toga Bay along the Oga Peninsula, Japan following an increase in seawater temperatures, and replacement of local sea urchin...

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Bibliographic Details
Published in:PloS one 2019-01, Vol.14 (1), p.e0209858-e0209858
Main Authors: Feng, Wenping, Nakabayashi, Nobuyasu, Narita, Kazumi, Inomata, Eri, Aoki, Masakazu N, Agatsuma, Yukio
Format: Article
Language:English
Subjects:
Acclimatization
Accuracy
Age
Age composition
Algae
Animals
Biology and Life Sciences
Chronology
Climate Change
Color
Developmental stages
Earth Sciences
Ecology and Environmental Sciences
Female
Females
Fish
Fisheries management
Gonads - physiology
Heliocidaris crassispina
Influence
Invertebrates
Japan
Male
Males
Medicine and Health Sciences
Ocean warming
Oceans
Population
Population structure
Range extension
Reproduction - physiology
Research and Analysis Methods
Sea urchins
Sea Urchins - growth & development
Sea Urchins - metabolism
Sea Urchins - physiology
Seasons
Seawater
Seawater - chemistry
Sex Differentiation - physiology
Spawning
Temperature
Temperature data
Trends
Water temperature
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Summary:Ocean warming has facilitated the range expansion of commercially important sea urchin species to higher latitudes. Heliocidaris crassispina was recorded to extend northward to Toga Bay along the Oga Peninsula, Japan following an increase in seawater temperatures, and replacement of local sea urchin species Mesocentrotus nudus. In order to identify evidence of adaptation occurring in response to a range extension of H. crassispina to the newly extended environments, we randomly collected 106 H. crassispina in August 2014 in Toga Bay, determined the growth and age composition and examined gonad traits (size, color and development). To confirm the gonad development, 30 H. crassispina with > 30 mm diameter were collected in July, August and September 2017. We found slower growth in the extended range than the central range. More delayed gonad development of males than those of females and a large variety of developmental stages in the acini of testis indicated that the spawning of both sexes of the sea urchins were asynchronous. In terms of gonad color, L* (lightness) values increased with increasing GI, while b* (yellowness) values decreased with increasing age. The population consisted of seven year-classes from 2006 to 2012, suggesting persistent juvenile recruitment. Long-term water temperature data indicated that the range extension of H. crassispina was due to ocean warming, in particular during the summer spawning season.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0209858