Climbing behavior of guarding males in the hermit crab Pagurus minutus: the effect of rivals, female size, and being weaponless

2020 ◽  
Author(s):  
Takayoshi Tanaka ◽  
Chiaki I. Yasuda ◽  
Tsunenori Koga
Keyword(s):  
Hermit Crab ◽  
Female Size ◽  
Climbing Behavior

Population biology and fecundity of the Indo-Pacific hermit crab Clibanarius longitarsus (Anomura: Diogenidae)

2005 ◽  
Vol 85 (1) ◽  
pp. 121-125 ◽  
Author(s):  
Carlos Litulo
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Hermit Crab ◽  
Population Biology ◽  
Size Structure ◽  
Reproductive Activity ◽  
Female Size ◽  
Frequency Distributions ◽  
One Year ◽  
Average Size

The population biology and reproduction of the hermit crab Clibanarius longitarsus were studied with emphasis on size structure, sex ratio, breeding season and fecundity. Specimens were sampled monthly over a period of one year (January–December 2003) at Costa do Sol mangrove, Maputo Bay, southern Mozambique. A total of 597 individuals was obtained of which 202 were males, 192 non-ovigerous females and 203 ovigerous females. Annual size–frequency distributions were polymodal for males and bimodal for non-ovigerous and ovigerous females, respectively. Sexual dimorphism was recorded by the larger average size attained by males in relation to females. Sex ratio was female-biased during most months of the study. Clibanarius longitarsus showed a higher reproductive activity with two major peaks (March and October). Juvenile recruitment was continuous throughout the study period. Clutch size was positively associated with female size. The high number of ovigerous females as obtained in the present population may evidence a higher reproductive activity displayed by C. longitarsus at Costa do Sol mangrove.

Population structure and reproduction of the hermit crab Dardanus deformis (Anomura: Diogenidae) in the Indian Ocean

2005 ◽  
Vol 85 (4) ◽  
pp. 883-887 ◽  
Author(s):  
Carlos Litulo
Keyword(s):  
Population Structure ◽  
Indian Ocean ◽  
Hermit Crab ◽  
Reproductive Activity ◽  
Female Size ◽  
Frequency Distributions ◽  
High Incidence ◽  
Egg Number ◽  
The Indian Ocean ◽  
Continuous Reproduction

The population structure and fecundity of the hermit crab Dardanus deformis were studied. Monthly samples were obtained between January and December 2003 at Costa do Sol, Maputo Bay, southern Mozambique. A total of 604 individuals was analysed of which 273 were males, 164 non-ovigerous females and 167 ovigerous females. The overall size–frequency distributions were unimodal, with males reaching larger sizes than both ovigerous and non-ovigerous females. Females were slightly more abundant than males, but the overall sex ratio did not differ significantly from 1:1. Dardanus deformis showed continuous reproduction throughout the study period. A small number of juveniles was obtained, suggesting that recruitment may take place in a different habitat than that occupied by the adults. The egg number increased with female size, and the high incidence of ovigerous females, may suggest a higher reproductive activity probably as a result of the rapid embryonic development in the study area.

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