High motivation enables smaller contestants to win the contests in fiddler crabs (Brachyura, Ocypodidae)

Crustaceana ◽  
2017 ◽  
Vol 90 (11-12) ◽  
pp. 1473-1481
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee
Keyword(s):  
Body Size ◽  
Fiddler Crabs ◽  
Fighting Ability ◽  
Uca Annulipes ◽  
High Motivation ◽  
Short Time ◽  
Male Contests

We observed the outcomes of fights of smaller contestants against larger opponents during male-male contests in Uca annulipes (H. Milne Edwards, 1837), Uca bengali Crane, 1975, and Uca rosea (Tweedie, 1937). Smaller contestants won 30, 31 and 37% of the contests in U. annulipes, U. bengali and U. rosea, respectively, regardless of body size disadvantages. Smaller contestants won when body size asymmetries were lesser, but took a longer time to win the contests, while with greater size-asymmetries, smaller ones lost the contests in a short time. In U. bengali and U. rosea, most of the smaller winners were residents (burrow owners), but not in U. annulipes. This study shows that longer fighting duration or high motivation enables the smaller contestants, especially the residents, to overcome their inferior fighting ability and win contests against larger opponents.

Sex and size affecting time allocations for activities in Uca annulipes (H. Milne Edwards, 1837)

Crustaceana ◽  
2016 ◽  
Vol 89 (6-7) ◽  
pp. 759-773 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee
Keyword(s):  
Body Size ◽  
Female Body ◽  
Feeding Rate ◽  
Small Male ◽  
Fiddler Crabs ◽  
Male And Female ◽  
Negatively Associated ◽  
Female Body Size ◽  
Uca Annulipes

We investigated the amount of time that large and small, male and female fiddler crabsUca annulipes(H. Milne Edwards, 1837) spent on feeding, walking, standing, grooming, burrowing, inside burrows, fighting, and courtship waving. We video-recorded the activities of 45 males (22 small and 23 large), and 39 females (19 small and 20 large) each for 5 min, and calculated the percentage of time spent on each activity/crab. Our results showed that both sexes spent more time on feeding than on other activities. Males spent more time on building burrows, walking, and grooming than females, and females spent more time inside burrows than males. Smaller males spent more time on feeding, and less time on building burrows and on waving than larger ones. There were no relations between female body size and activities. Feeding rate/feeding claw was higher in males than in females, and crab body size was negatively associated with feeding rate/min.

scholarly journals Ultraviolet signals fighting ability in a lizard

2006 ◽  
Vol 2 (2) ◽  
pp. 169-172 ◽  
Author(s):  
Jessica Stapley ◽  
Martin J Whiting
Keyword(s):  
Body Size ◽  
Mate Choice ◽  
Female Mate Choice ◽  
Fighting Ability ◽  
Initial Stage ◽  
Contest Outcome ◽  
Rival Assessment ◽  
Free Ranging ◽  
Male Contests

Ultraviolet (UV) signals are used in female mate choice in numerous taxa; however, the role of UV signals in male contests remains relatively unexplored. We experimentally reduced throat UV of free-ranging lizards ( Platysaurus broadleyi ) to test whether UV acts as a signal of fighting ability during male contests. We found that UV-reduced males were more likely to be challenged than control males. However, contest outcome was not influenced by UV-reduction, and this was despite other obvious asymmetries between opponents, such as body size and residency. Throat UV was confirmed as a signal of fighting ability because contests were more likely to escalate when one contestant had reduced UV. Therefore, throat UV, not body size or residency, was used during the initial stage of opponent assessment, but this did not influence contest outcome. The results suggest that UV overrides other traits that could function as signals during rival assessment.

Behavioural responses of the mangrove fiddler crabs (Uca annulipes and U. inversa) to urban sewage loadings: Results of a mesocosm approach

2009 ◽  
Vol 58 (12) ◽  
pp. 1860-1867 ◽  
Author(s):  
Fabrizio Bartolini ◽  
Gil Penha-Lopes ◽  
Samwel Limbu ◽  
José Paula ◽  
Stefano Cannicci
Keyword(s):  
Fiddler Crabs ◽  
Behavioural Responses ◽  
Urban Sewage ◽  
Uca Annulipes

scholarly journals IDENTIFIKASI JENIS KEPITING BIOLA DI HUTAN MANGROVE DUSUN SETINGGA ASINDESA SEBUBUS KECAMATAN PALOH KABUPATEN SAMBAS

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Edy Kurniawan ◽  
M Sofwan Anwari ◽  
M Dirhamsyah
Keyword(s):  
Sampling Method ◽  
Fiddler Crab ◽  
Sandy Beaches ◽  
Mangrove Forests ◽  
Crab Species ◽  
Fiddler Crabs ◽  
Purposive Sampling ◽  
Plot Size ◽  
Uca Annulipes

The fiddler crab is also known as the kepiting biola is an animal that has broad legs that belong to the Crustacean class. Fiddler crab is a type of crab that has a habitat in intertidal areas, especially around mangrove forests and sandy beaches. This study aims to examine the identification of fiddler crab species found in the Mangrove Sebubus. The method used in this research is purposive sampling method with the use of a square plot size of 1 x 1 meter as many as 30 pieces in 3 research lines. The results showed as many as 7 species of fiddler crabs found there, that is Uca annulipes, Uca rosea, Uca forcipata, Uca bellator, Uca tetragonon, Uca paradussumieri, and Uca acuta.Keywords: Identification, Fiddler Crab, Mangrove Sebubus

Receiver female body size and distances affect the claw-waving rate of signaller males in fiddler crabs (Brachyura, Ocypodidae)

Behaviour ◽  
2018 ◽  
Vol 155 (10-12) ◽  
pp. 905-914 ◽  
Author(s):  
Fahmida W. Tina ◽  
M. Jaroensutasinee ◽  
K. Jaroensutasinee
Keyword(s):  
Body Size ◽  
Female Body ◽  
Carapace Width ◽  
Fiddler Crabs ◽  
Female Body Size ◽  
Waving Display ◽  
Body Sizes ◽  
Males And Females ◽  
First Time ◽  
Close Distance

Abstract We tested for the first time how Austruca bengali Crane, 1975 signaller males adjusted their waving rates based on receiver female body sizes and their distances. We video recorded the waving display of 46 males (9–12 mm carapace width) for 30 s, and counted their waving rate. Receiver females were categorised as small (8–10 mm carapace width) and large (>10 mm). Distances between males and females were categorised as short (⩽12 cm) and long (>12 cm) distances. Our results indicate that males are able to measure distances and female sizes, and adjust their waving display by actively reducing waving rate (1) towards small females, as usually small females have lower fecundity compared to large ones and (2) towards females at very close distance because at this point, the females would make their mating decision, and thus males start to lead/hit the females towards their burrow rather than waving vigorously.

scholarly journals Animal Models for Studying Stone Disease

Diagnostics ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 490
Author(s):  
Szu-Ju Chen ◽  
Kun-Yuan Chiu ◽  
Huey-Yi Chen ◽  
Wei-Yong Lin ◽  
Yung-Hsiang Chen ◽  
...  
Keyword(s):  
Animal Model ◽  
Drosophila Melanogaster ◽  
Body Size ◽  
Animal Models ◽  
Genetic Study ◽  
Lower Cost ◽  
Stone Disease ◽  
Sodium Oxalate ◽  
Genetic Studies ◽  
Short Time

Animals have stone disease too. There are several animal models for the research of human stone disease. Rodents are the most frequently used for stone research, although they are not prone to forming crystals in the kidneys. Ethylene glycol (EG), sodium oxalate and l-hydroxyproline are common lithogenic agents. Dogs and pigs were also reported as a study animal for stone disease. However, the breeding costs and body size are too high. The most-used genetic study animal for stone disease was the mouse, but it was high-cost. Calcium oxalate (CaOx) crystals can also be light microscopically observed in the Malphigian tubules of Drosophila melanogaster, induced by adding EG to the food. Genetic studies of flies can be done by cross-breeding, and this has a lower cost than using mice. The fly model also has several advantages, including minimal breeding equipment, the fact that it is easier to reach larger numbers in a short time with flies, that crystals can be observed under microscopy, and that they allow genetic study. We suggest the fly will be an ideal animal model for stone research in the future.

Differences in proportional claw size among left- and right-handed Atlantic sand fiddler crabs Leptuca pugilator (Bosc, 1801) (Decapoda: Brachyura: Ocypodidae)

2019 ◽  
Vol 39 (6) ◽  
pp. 720-723
Author(s):  
Benjamin E Martin
Keyword(s):  
Body Size ◽  
The Body ◽  
Sexually Dimorphic ◽  
Evolutionary Perspective ◽  
Prominent Feature ◽  
Body Proportions ◽  
Fiddler Crabs ◽  
Sexual Signal ◽  
Right Hand ◽  
Left And Right

Abstract The sexually dimorphic, enlarged major claw is a prominent feature among fiddler crabs and acts as both a sexual signal and weapon. Most often the enlarged claw occurs on the left and right sides of fiddler crabs in relatively even proportions (40–60%), but populations exhibit an extreme right handedness bias (> 90%) in a few cases. The mechanisms maintaining relatively even handedness proportions among fiddler crabs remains debatable, but from an evolutionary perspective it should be maintained through an evenness in fitness (reproduction and survival) between left- and right-handed crabs. I investigated handedness ratios and claw to body size in a Leptuca pugilator (Bosc, 1801) population on Sapelo Island, Georgia, USA. In collecting 417 adult male crabs, there was a slight right-hand bias (54%, χ 2= 2.9376, P = 0.087), which was similar to the previous study of this population 17 years prior. I nevertheless found right-handed crabs had significantly smaller claw size relative to their carapace size (P = 0.018). Overall, this study documents inequality in the body proportions between left- and right-handed L. pugilator within a population operating at a slight right hand-bias. I discuss how my study contributes to previous discussions on handedness bias in fiddler crabs as well as potential mechanisms that control its widespread handedness evenness.

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