Two species of fiddler crab show no cost of bearing a sexually selected giant claw in predator escape behaviors

The Relationship Between Morphometric Characteristics and The Weight of Tubuca forcipata (Subfamily: Gelasiminae) in The Mangrove Nature Reserve of Eastern Coast Resort Mendahara, Jambi Province

“…From the correlation test and determination coefficient, it is revealed that the length of the large chelae, the width of the large chelae, the length of the carapace, and the width of the carapace each contribute to the weight of T. forcipata by 63.72%, 67.87%, 50.03%, and 31.54%, respectively. Based on these analysis results, the largest contribution to the weight of T. forcipata comes from the large chelae, which is also attributed to the larger proportion of the large chelae compared to the carapace size (Pena & Levinton, 2021). Other contributions that can affect the weight of T. forcipata may come from the environment, as also stated by Campbell & Eagles (1983) who mentioned that environmental factors influence the overall size of adult crabs.…”

Relationship between weapon size and six key behavioural and physiological traits in males of the European earwig

“…However, the European earwig is not the only case where such associations appear to be lacking (Emlen, 2008;Swallow & Husak, 2011). For example, carrying giant claw is not associated with the efficiency of escape behavior and the level of metabolic costs in two fiddler crabs (Tullis & Straube, 2017;Pena & Levinton, 2021). Similarly, bearing large horns does not reflect male growth, mobility, or immunity in the rhinoceros beetle Trypoxylus dichotomus (McCullough & Emlen, 2013;McCullough & Tobalske, 2013).…”