Distribution, Sex Ratio and Body Size of Three Hermit Crab Species in Summer in the Waka-River Estuary
Distribution, Sex Ratio and Body Size of Three Hermit Crab Species in Summer in the Waka-River Estuary
复制标题
瓦卡河口夏季三种寄居蟹的分布、性别比及体型
DOI：
10.5179/benthos.63.23
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Yuri Fukuda
中科院分区：
文献类型：
--
作者：
T. Koga;Yuri Fukuda
和歌山大学教育学院生物实验室, 930 Sakaedani, Wakayama 640 8510, Japan 摘要：在日本，寄居蟹 Pagurus minutus、Diogenes nitidimanus 和 Clibanarius infraspinatus 分别常见于内海湾、沙质潮滩和浅潮下沉积物。我们在日本和歌山县和歌河口的六个采样点调查了这三种物种在夏季的分布。采样点沿着河口长度布置，其中1号点位于河口咸水高处，6号点位于河口，另外4个点位于河口梯度的中间位置，并标出每个点的数量。 Pagurus minutus 是六处地点中五处的优势物种。 Diogenes nitidimanus 主要分布在 3 号和 5 号中段，距离河口较近，底质为沙质。 Clibanarius infraspinatus 多见于 St. 6。D. nitidimanus 的性别比例在 St. 3 处偏向雄性，在 St. 5 处偏向雌性，而除 St. 4 处的 P. minutus 外，其他两种物种的性别比例在不同地点没有差异。雄性 P. minutus 的背甲和螯长度大于雌性，P. minutus 右手和 D. nitidimanus对于他们的左手，但在 C. infraspinatus 中对于他们的右手则不然。在 D. nitidimanus 中，小型雄性在 St. 3 处特别丰富，而各种体型（包括大型雄性）的雄性在 St. 5 处被收集。在两个地点都发现了各种大小的雌性。然而，St. 3 的雌性很少，而许多雌性（包括产卵的雌性）则栖息在 St. 5 中。D. nitidimanus 中存在远离繁殖群体的小型雄性种群可能是一个有趣的方面。关键词：比较研究，Clibanarius infraspinatus，Diogenes nitidimanus，Pagurus minutus，性别差异，性别二态性，滩涂+，-。 /01234 5 67 89: ;8 ?.@A-(Gherardi 1990; Gherardi & Nardone 1997)& B CDE FGH IJ Pagurus filholi KLMIJ P. lanuginosus ˇNOPQ˘RClibanarius vi-rescens 3 S2T 1 U 0VWIJ ˇNOPQ˘RH.X FHW SYAZ1- (Imazu & Asakura 1994)& SYA [; 01 F\] ^_‘ a b-Sc˘ Adˇ 01eˆfg1- (Imazu & Asakura) 1994)h Thurman 2003, 2005)&!" {GE .f|}|A S234 S #$~ig 01 •†‡IJ Pa-gurus minutus …†‡—– Diogenes nitidimanus8ƒ⁄ ‹ SH› & •†‡IJ .%& FGVi−‰ …†‡—– .„“ FGVik”5‘’‚™ −‰$34 =:fi ’fl1995Ł c %H2T 1- ‹ S Œfg & •†‡IJ S Ÿr-1.Ži (l )œ& -1sž A>?S, (Kikuchi 1962)&g6 *+ .11l5 €H12 €i’¢8£⁄ |=S 5 ¥ƒ ,- §¤Vi '“10l3欧元。 «G←-01- 6›H, &…†‡—– r-1W )œ& -1fiflA>?S, (Asakura 1987a, b; Asakura1995; Asakura & Kikuchi 1984)&g6 X H˘ˇˆ°–‚†‡· µSYAU ¶S •‚.m– ›„. S S Ÿ/ .X . &0”˘ˇˆWm–H‘–6U ›„ ‹›0=0”˘ˇˆ 1收稿日期 2007年11月15日 接受日期 2008年5月16日 通讯作者
Biological Laboratory, Faculty of Education, Wakayama University,930 Sakaedani, Wakayama 640 8510, JapanAbstract: In Japan, the hermit crabs Pagurus minutus, Diogenes nitidimanus and Clibanarius infraspinatus are commonin inner bays, sandy tidal flats and shallow subtidal sediment, respectively. We investigated the distribution of thesethree species in summer at six sampling sites in the Waka-River Estuary, Wakayama Prefecture, Japan. The samplingsites were placed along the length of the estuary, with Site 1 situated high up in the brackish water of the estuary, Site6 at the river mouth, and the other four sites at intermediate locations along the estuary gradient with the number ofeach site. Pagurus minutus was the dominant species at five out of six sites. Diogenes nitidimanus was mainly found atintermediate St. 3 and 5, relatively close to the river mouth, and had sandy substrates. Clibanarius infraspinatus wasmostly found at St. 6. The sex ratio of D. nitidimanus was highly biased to males at St. 3 and to females at St. 5, whilethe sex ratio of the other two species did not vary across sites except for P. minutus at St. 4. Carapace and chelae lengthof males were larger than those of females in P. minutus for their right hands and in D. nitidimanus for their left hands,but not in C. infraspinatus for their right hands. In D. nitidimanus, small males were especially abundant at St. 3, whilemales of various size including large ones, were collected at St. 5. Females of various sizes were found at both sites.However, there were very few females at St. 3, while many females, including ovigerous ones, inhabited St. 5. Theexistence of the small male population distant from the reproductive population in D. nitidimanus may be an interestingaspect with respect to the life history strategy of the males and deserves further investigation.KeyWords: comparative study, Clibanarius infraspinatus, Diogenes nitidimanus, Pagurus minutus, sexual di#erence,sexual dimorphism, tidal flat+, -. /01234 5 67 89: ;8 ?.@A-(Gherardi 1990; Gherardi & Nardone 1997)&BCDEFGH.IJ Pagurus filholi KLMIJ P. lanuginosusˇNOPQ˘RClibanarius vi-rescens 3 S2T 1 U0VWIJ ˇNOPQ˘RH.XFHW SYAZ1- (Imazu& Asakura 1994)& SYA [;01F\]^_‘ab-Sc˘Adˇ01eˆfg1- (Imazu & Asakura 1994)h Thurman 2003, 2005)&!"{GE.f|}|A S234 S#$~ig 01•†‡IJ Pa-gurus minutus …†‡—– Diogenes nitidimanus8ƒ⁄ ‹SH› &•†‡IJ .%&FGVi−‰…†‡—– .„“ FGVik”5‘’‚™−‰$34 =:fi ’fl1995Łc %H2T 1- ‹SŒfg &•†‡IJ SŸr-1.Ži (l)œ& -1sžA>?S, (Kikuchi 1962)&g6 *+.11l5 €H12 €i’¢8£⁄|=S5¥ƒ,-§¤Vi '“10l3 €. «G‹ -01- 6›H, &…†‡—– r-1W )œ& -1fiflA>?S, (Asakura 1987a, b; Asakura1995; Asakura & Kikuchi 1984)&g6 X H˘ˇˆ°–‚†‡·µSYAU ¶S•‚.m– ›„. SSŸ/ .X . &0”˘ˇˆWm–H‘–6U ›„‹›0=0”˘ˇˆ 1Received 15 Nov. 2007 Accepted 16 May 2008 Corresponding author