Gonad traits and age structure of the sea urchin <italic style="font-style: italic">Heliocidaris crassispina</italic> in central range: a comparison with range-extenders

Wenping FENG; Daichi NAKANO; Nobuyasu NAKABAYASHI; Masakazu N. AOKI; Xiaofei TIAN; Yukio AGATSUMA

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Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range: a comparison with range-extenders

Biology | Updated：2024-10-14

- Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range: a comparison with range-extenders
- Journal of Oceanology and Limnology Vol. 41, Issue 5, Pages: 1954-1964(2023)
- Affiliations：
  
  1.Fisheries College, Zhejiang Ocean University, Zhoushan 316022, China
  2.Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
  3.Fukui Prefectural University, Fukui 910-1195, Japan
  4.Akita Prefectural Institute of Fisheries, Oga 010-8570, Japan
- Author bio：
  
  xiaofeitian0303@hotmail.com
  yukio.agatsuma.c7@tohoku.ac.jp
- Funds：
- DOI：
  CLC：
- Received：10 February 2022，
  
  Accepted：08 April 2022，
  
  Online First：27 June 2022，
  
  Published：01 September 2023
- Accepted：
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FENG Wenping,NAKANO Daichi,NAKABAYASHI Nobuyasu,et al.Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range: a comparison with range-extenders[J].Journal of Oceanology and Limnology,2023,41(05):1954-1964.
DOI：

FENG Wenping,NAKANO Daichi,NAKABAYASHI Nobuyasu,et al.Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range: a comparison with range-extenders[J].Journal of Oceanology and Limnology,2023,41(05):1954-1964. DOI：

摘要

Abstract

The sea urchin

Heliocidaris crassispina

has northern expanded in geographic range to Toga Bay

Oga Peninsula in the Sea of Japan due to the global warming. To demonstrate the gonad traits and age structure of

crassispina

in the central range and compare the difference with those in northern extended range

we collected 100

crassispina

individuals from a barren off Shitsumi

Fukui (central range)

in August 2018. Their growth

gonad traits (size

development and color)

and sex ratio were investigated and compared with those in Toga Bay

in August 2014 (extended range). The successive 2012–2016 year classes of

crassispina

indicated successive juvenile recruitment in the central range

as found in the extended range. The individuals at three years old in central range were obviously larger than those in the extended range

showing large test diameter and body weight

possibly due to the higher temperature in central range than that in northern extended range. In addition

a balanced sex ratio in the central range was found

in contrast to

the female-skewed sex ratio found in the extended range. Gonadal development was sex- and site-dependent. The testicular development in the central range was not only delayed in comparison to ovarian development

but also less delayed than those in the extended range

which possibly attribute to the higher water temperature in the central range. A significantly lower male gonad index and

(lightness) value was recorded in central ranges compared to that in extended range

possibly due to the releasement of sperm of

crassispina

in central ranges.

关键词

Keywords

references

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Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range: a comparison with range-extenders

DOI：

摘要

Abstract

关键词

Keywords

references