Effects of shell size fit on the efficacy of mate guarding behaviour in male hermit crabs

2004 ◽  
Vol 84 (6) ◽  
pp. 1203-1208 ◽  
Author(s):  
Kenji Yoshino ◽  
Miho Ozawa ◽  
Seiji Goshima
Keyword(s):  
Body Size ◽  
Breeding Season ◽  
Hermit Crab ◽  
Mate Guarding ◽  
The Body ◽  
Hermit Crabs ◽  
Contest Competition ◽  
Shell Size ◽  
Pagurus Filholi ◽  
Size Preference

Males of the hermit crab Pagurus filholi show pre-copulatory mate guarding behaviour to keep a receptive female from other rival males during the breeding season. Guarding males are often replaced by other males via contest competition. Shell size fit and shell species of males effects were investigated to see if their ability to defend females against rivals depends on their shell. Shell size fit and shell species of guarding males were experimentally manipulated and then, the males were allowed to guard a female and interact with rival males of various sizes. Contest outcomes depended on neither the shell size fit nor shell species of the guarding males, and depended on body size ratio between guarding and rival males. When the body size of guarding and rival males was similar, however, guarding males in large fitting shells defended their female mate significantly more often than those in small fitting shells. For Chlorostoma lischkei shells, small males preferred larger shells during the breeding season than after the breeding season. The plasticity in the shell size preference of small males suggests that they compensate for body size disadvantage in mating versus larger rivals and for higher defence ability of female mates versus similar sized rivals.

scholarly journals Asymmetrical morphology and growth of the hermit crab Pagurus filholi (Decapoda, Anomura, Paguridae) reared in non-dextral shell conditions

Crustaceana ◽  
2014 ◽  
Vol 87 (4) ◽  
pp. 476-488 ◽  
Author(s):  
Michio Imafuku ◽  
Hisakazu Ikeda
Keyword(s):  
Hermit Crab ◽  
The Body ◽  
Body Parts ◽  
Pagurus Filholi ◽  
Control Body ◽  
The Right ◽  
De Man ◽  
Major Cheliped

The body of a hermit crab shows asymmetrical morphology, which may be related to utilization of the dextral shell. To examine the effect of the shell, we reared Pagurus filholi (De Man, 1887) from the glaucothoe stage to full-sized adults, in a sinistral shell, in a straight tusk shell, without a shell, and in a normal dextral shell as a control. Body parts that show the most conspicuous asymmetry, uropods, pleopods and chelipeds, were checked at the time of the shedding of exuviae during rearing. No inversion of laterality on these characters was observed. However, in crabs subjected to conditions other than a dextral shell, the otherwise rather short right uropod became somewhat extended, and in those reared in sinistral shells, the right major cheliped was more enlarged.

Primary productivity, deoxygenation, and the Gulliver-absence effect determine bivalve body size following the end-Permian mass extinction

2020 ◽  
Author(s):  
Melanie Tietje ◽  
William J. Foster ◽  
Jana Gliwa ◽  
Clara Lembke ◽  
Autumn Pugh ◽  
...  
Keyword(s):  
Body Size ◽  
Ocean Circulation ◽  
Mass Extinction ◽  
The Body ◽  
Large Species ◽  
Mass Extinctions ◽  
Shell Size ◽  
Body Sizes ◽  
Permian Mass Extinction ◽  
The Impact

<p> The impact of mass extinctions on the body sizes of animals has received considerable attention and debate, as to whether the reduced size of post-extinction organisms is due to the selective extinction of large species, absence of large species as a stochastic effect of low-diversity faunas, or a size decrease within surviving genera and species. Here, we investigated the body sizes of bivalves following the end-Permian mass extinction event and show that the shell size increase of bivalve genera was driven by both evolutionary and ecophenotypic responses. First, some genera show significant increases in body size with the evolution of new species. Further, the same genera record significant within-species increases in average and maximum body size into the late Induan, indicating that ecophenotypic changes were also involved on long-term body size trends. These increases are associated with invigorated ocean circulation, improved oxygenation of the seafloor, and probably increased food supply.</p>

BEHAVIOUR AND MORPHOLOGY OF PAGURID HERMIT CRABS (DECAPODA, ANOMURA) THAT LIVE IN TUSK SHELLS (MOLLUSCA, SCAPHOPODA)

Crustaceana ◽  
1999 ◽  
Vol 72 (2) ◽  
pp. 129-144 ◽  
Author(s):  
Takamichi Ando ◽  
Michio Imafuku
Keyword(s):  
Hermit Crab ◽  
Asymmetry Index ◽  
Hermit Crabs ◽  
Positive Correlation ◽  
Weak Preference ◽  
A Value ◽  
Pagurus Filholi ◽  
Parallel Pattern ◽  
De Man ◽  
Shield Length

AbstractBehaviour and morphology of the hermit crab, Pagurus imafukui, which occupies tusk shells in nature, were investigated. A positive correlation was found between the shield length of the crab and the width of the tusk shell. The uropods were nearly symmetrical, with an average asymmetry index of 0.04, such in contrast with a value of 0.28 for Pagurus filholi, that naturally occupies dextral shells. P. imafukui showed a weak preference for tusk shells over dextral shells. The crabs walked in a parallel pattern, while they adopted a cross pattern when forced to enter dextral shells or were in a shell-less condition. On the contrary, P. filholi individuals walked in a cross pattern when in a tusk shell as well as in a dextral shell. Behaviours of shell entering, copulation, and zoeal release as seen in P. imafukui, are similar to the conditions observed in other species. Nearly symmetrical uropods, preference for non-spiral shells, and the walking style comprising a parallel pattern, are thought to be specific to this hermit crab that lives in non-spiral dwellings. Verhalten und Morphologie des Einsiedlerkrebses Pagurus imafukui McLaughlin & Konishi, 1994 der Scaphopoden-Schalen bewohnt, wurden untersucht. Es wurde eine positive Korrelation zwischen Carapaxlange des Krebses und Breite der Scaphopoden-Schale gefunden. Die Uropoden sind fast symmetrisch. Der Medianwert des Asymmetrie-Indexes betragt 0,04 in deutlichem Gegensatz zu dem von 0,28 bei Pagurus filholi De Man, 1887, der rechtsgewundene Schalen bewohnt. P. imafukui zeigte eine schwache Bevorzugung von Scaphopoden-Schalen im Vergleich mit rechtsgewundenen Schalen. Die Gangart der Einsiedler ist parallel, aber uber Kreuz in schalenlosem Zustand oder in rechtsgewundener Schale. Von P. filholi wird sowohl in Scaphopoden-Schalen als auch in rechtsgewundenen Schalen nur letztere Gangart benutzt. Das Verhalten bei der Inbesitznahme der Schale, bei der Begattung und dem Entlassen der Zoeen gleicht dem bei anderen Arten. Fast symmetrische Uropoden, Bevorzugung ungewundener Schalen und die parallele Gangart werden als Besonderheiten dieser Einsiedler-Art betrachtet, die ungewundene Gehause bewohnt.

scholarly journals Shell utilization pattern of the hermit crab Clibanarius vittatus (Crustacea, Anomura) in an estuary at São Vicente, State of São Paulo, Brazil

2006 ◽  
Vol 96 (2) ◽  
pp. 261-266 ◽  
Author(s):  
Bruno S. Sant'Anna ◽  
Cilene M. Zangrande ◽  
Alvaro L. D. Reigada ◽  
Marcelo A. A. Pinheiro
Keyword(s):  
Hermit Crab ◽  
Sao Paulo ◽  
Hermit Crabs ◽  
Size Difference ◽  
São Paulo ◽  
Utilization Pattern ◽  
Shell Size ◽  
Stramonita Haemastoma ◽  
Clibanarius Vittatus ◽  
Shield Length

We evaluated the gastropod shell utilization pattern of the hermit crab Clibanarius vittatus (Bosc, 1802) at Pescadores Beach in São Vicente, State of São Paulo, Brazil. Specimens were collected monthly from May 2001 through April 2003, in the intertidal zone at low tide. The crabs were weighed and their carapace shield length measured. All gastropod shells were identified and had their shell biometric parameters (total length and aperture length) measured (mm) and weighed (g). A total of 2,344 hermit crabs (644 males, 1,594 females, 45 ovigerous females and 61 individuals in intersex), using 13 species of gastropod shells, were collected. Stramonita haemastoma (Linnaeus, 1767), Cymatium parthenopeum (Von Salis, 1793) and Achatina fulica (Bowdich, 1822) comprised over 98% of all the shells. Male and intersex crabs were significantly larger than the females. This size difference strongly influenced the shell utilization pattern, principally in A. fulica, which has the largest shell size, that was only used by males and intersexual individuals of C. vittatus. Cymatium parthenopeum was the only shell species that showed a high determinant coefficient in all the biometric correlations evaluated. The high abundance of S. haemastoma shells and a strong correlation between crab size and shell aperture length established by a significant determination coefficient, indicated that C. vittatus uses this species as the principal resource for shell occupation at Pescadores Beach.

Shell-size preference of hermit crabs depends on their growth rate

1997 ◽  
Vol 54 (1) ◽  
pp. 1-8 ◽  
Author(s):  
SATOSHI WADA ◽  
HIROFUMI OHMORI ◽  
SEIJI GOSHIMA ◽  
SHIGERU NAKAO
Keyword(s):  
Growth Rate ◽  
Hermit Crabs ◽  
Shell Size ◽  
Size Preference

Regional variation in preference for gastropod shell species in the hermit crab Pagurus filholi

2011 ◽  
Vol 91 (4) ◽  
pp. 893-896 ◽  
Author(s):  
Hiromi Hasegawa ◽  
Satoshi Wada ◽  
Masakazu Aoki ◽  
Keiji Wada
Keyword(s):  
Hermit Crab ◽  
High Temperature Stress ◽  
Hermit Crabs ◽  
Energetic Cost ◽  
Gastropod Shell ◽  
Shell Weight ◽  
Thais Clavigera ◽  
Pagurus Filholi ◽  
Two Populations ◽  
Northern Japan

The preference for two shell species, Monodonta labio form confusa and Thais clavigera, was compared between two populations of the hermit crab Pagurus filholi from Oura Bay, Shimoda, central Japan and from Hakodate Bay, Hakodate, northern Japan. Hermit crabs from Oura Bay preferred T. clavigera to M. labio form confusa, whereas crabs from Hakodate Bay preferred M. labio form confusa. The shell of T. clavigera was more effective against desiccation and high temperature stress but heavier than M. labio form confusa. The preference of P. filholi from Oura Bay for T. clavigera may be attributable to the greater requirement for protection against higher physical stresses, even though a higher energetic cost related to the shell weight is incurred.

Larval Development of the Hermit Crab Diogenes Miles (Herbst, 1791) (Decapoda, Anomura, Diogenidae) in the Laboratory

Crustaceana ◽  
1993 ◽  
Vol 65 (2) ◽  
pp. 253-264 ◽  
Author(s):  
K.N. Sankolli ◽  
Shakuntala Shenoy
Keyword(s):  
Larval Development ◽  
Breeding Season ◽  
West Coast ◽  
Hermit Crab ◽  
Hermit Crabs ◽  
Peninsular India ◽  
Complete Reduction ◽  
Sandy Shores ◽  
The Third ◽  
Salient Features

AbstractHermit crabs are the commonest intertidal anomuran crustaceans. Diogenes miles (Herbst) is an inhabitant of surf-beaten sandy shores along coasts of peninsular India. This species is outstanding among other diogenid hermit crabs in having, unlike others, an extremely flat and broad body well adapted for its occurrence in long, narrow-mouthed gastropod shells mostly of Oliva and to lesser extent Gypraea and Conus. During the present study it was observed that, contrary to what was expected, D. miles docs not breed throughout the year but appears to have its breeding season restricted to the summer months. This was indicated by the collection of ovigerous females of the species only during the summer months near Bombay, Ratnagiri and Karwar along the Indian west coast. Eggs are minute, bright crimson to scarlet when immature and are easily shed, even with slight disturbance. Larval development consists of 3 zoeal and a megalopa stages, described in the present paper, after specimens reared in the laboratory. Some of the salient features of the zoea larvae are: a long, pointed rostrum, smooth carapace, usual triangular telson with process formula 7 + 7 in the first zoea but complete reduction of the 4th process in the third zoea. The megalopa has the typical unequal chelipeds, the left being larger, only 3 pairs of pleopods, and the telson is rectangularly rounded. Though the deep curve of the carpus develops right from the megalopa stage, the inward right-angled bend of the cheliped, so characteristic of the adult, is not fully developed even in the 5 subsequent instars.

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