Zoologischer Anzeiger, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 1, 2024
Язык: Английский
PLoS ONE, Год журнала: 2025, Номер 20(2), С. e0314320 - e0314320
Опубликована: Фев. 5, 2025
Yeti crabs (Kiwaidae) are deep-sea hydrothermal vent and methane seep dwelling crustaceans that farm chemosynthetic microbes on their bodies. Sexual dimorphism is a common feature of decapod crustaceans, but little known about its prevalence in species from habitats. We address this knowledge deficit by investigating claw sexual symmetry the hydrothermal-vent endemic ’Hoff crab’, Kiwa tyleri . A total 135 specimens East Scotia Ridge were examined, revealing mean asymmetry indices close to zero with respect propodus length height, albeit significantly larger number marginally left-dominant individuals length, possibly indicative some task specialisation between claws, or vestigial ancestral trait. Both male female claws exhibit positive allometry increasing carapace males possess compared females when accounting for size, exhibiting faster growing broader heights throughout size distribution. This marked difference either male-male competition mate access, selection, differential energy allocation (growth vs reproduction) females, as observed other crustaceans. In contrast, reanalysis data inhabiting yeti crab puravida revealed no significant allometry, indicating possible lack similar selection pressures, highlighting potential key differences ecological reproductive strategies K relating function, microbial productivity population density. Whether sex represents norm exception Kiwaidae will require examination family. research enhances our understanding behaviour, ecology evolution crabs, providing basis future studies.
Язык: Английский
Процитировано
0
Biological Journal of the Linnean Society, Год журнала: 2022, Номер 136(1), С. 173 - 186
Опубликована: Фев. 26, 2022
Abstract Animal weapons are generally complex systems composed of more than one structure. A crab’s claw, for instance, is a dactyl (a movable finger) and propodus (where the muscle resides). Any weapon feature that increases winning probability also an individual’s fitness, meaning all moving parts will be under same selective force—increasing their integration. By comparing to homologous structures not used fighting, we can test whether fighting morphological Here, tested hypothesis by right (non-fighting) left (fighting) claws males Aegla. First, if shape size differed between claws. Then, compared degree We showed in size, but both similarly high levels This pattern occur selection favours adequate squeeze on claws, even though squeezing performance might differ Nevertheless, important determining integration claw it has been greatly ignored crustacean studies its study increase our knowledge evolution.
Язык: Английский
Процитировано
9
Biological Journal of the Linnean Society, Год журнала: 2023, Номер 139(1), С. 57 - 69
Опубликована: Март 31, 2023
Abstract Animal weapons are diverse and often exaggerated structures associated with sexual selection male–male combat. Despite their diversity, our knowledge of these comes primarily from studies that focus on the size neglect other components, such as shape or performance. Furthermore, can exhibit species-level plasticity based nutrition ecological variables, but few have documented seasonal variation in weapon plasticity. Here, we investigate how size, performance differ across adult male reproductive non-reproductive Allegheny crayfish, Faxonius obscurus. Given F. obscurus cambarid crayfishes cyclical moulting between states, they provide an ideal system which to questions. We found claws all three components investigated; males were longer, stronger different compared males. Wielding longer is likely confer greater competitive success during mating season, demonstrates unexplored pattern discuss results considering seasonality phenotypes propose several avenues future research using crayfish a model system.
Язык: Английский
Процитировано
5
Acta Zoologica, Год журнала: 2024, Номер unknown
Опубликована: Июнь 26, 2024
Abstract The evolutionary success of the Alpheus snapping shrimps is linked to their claws, which were considered key innovation in evolution these shrimps. However, many aspects claws remain unknown. We evaluate degree intra‐ and interspecific variation shape claw different shrimp species. For this, we used a geometric morphometric tool. investigated from two perspectives — sexual dimorphism three species: angulosus , A. carlae, estuariensis locations along southern coast Bahia state northeastern Brazil. Our results revealed among . In addition, was confirmed carlae our reveal monomorphism claw. findings highlight importance considering both ecological context phylogenetic relationships when analysing morphology suggest further investigations better understand implications for history
Язык: Английский
Процитировано
1
Canadian Journal of Zoology, Год журнала: 2023, Номер 101(8), С. 658 - 671
Опубликована: Апрель 25, 2023
Crustaceans usually undergo a series of changes after the puberty molt. These are often associated with size increases in body and structures such as abdomen claws so that they can achieve higher reproductive fitness. morphological allow animal to fight, court, signal for its conspecific better performance. To compare ontogenetic changes, we used freshwater crab Dilocarcinus pagei Stimpson, 1851 model. We analyzed differences carapace claw shape, force generation (via apodeme area), integration claws, color among demographic groups. Adult crabs had an increase followed by shape change makes more robust. In addition, animals changed from dark brown coloration juveniles red adult males, while females presented red-brown coloration. Presumably, phenotypic may enhance crabs’ ability obtain different food sources, well fight sexual partners, manipulate during courtship. Color be strategy which males females, help camouflage substrate.
Язык: Английский
Процитировано
3
Journal of Morphology, Год журнала: 2023, Номер 284(8)
Опубликована: Июль 5, 2023
Abstract Animal weapons are morphological traits that improve the fighting ability of wielder and associated with competition. These typically sexually dimorphic, males possessing weaponry females lacking weaponry. However, in some cases, like many crustaceans, both wield enlarged claws, which may function as weapons. Further, animal vary their size, shape, performance, theory predicting selection pressure for should be highest when importance fights is greatest, such during a reproductive season. degree direction based on sex season, potentially benefiting from wielding larger nonreproductive seasons. Crayfishes offer an ideal system to investigate how weapon phenotypes change across seasons since undergo form alteration reproduction. Thus, we investigated whether female Allegheny crayfish, Faxonius obscurus , claws or pinching strength form. We found F. stronger findings align previous research same species. discuss predictions about relationship between seasonality investment differ sex.
Язык: Английский
Процитировано
3
Invertebrate Biology, Год журнала: 2023, Номер 142(3)
Опубликована: Авг. 14, 2023
Abstract Studies of animal weaponry and defensive structures rarely take into consideration their underlying mechanical properties. We measured the compressive strength thickness exoskeleton claw (chela) in two North American crayfish species, Faxonius virilis F. limosus . performed similar measures on carapace, a body region not directly involved agonistic contests. Males both species generated significantly stronger maximum pinch forces than females. However, these differences can be attributed to size between sexes. The (ultrastructure) was significant predictor its likely explained difference we observed species. Neither nor correlated with force. Additionally, found that strong carapace thickness, whereas sex not. had greater corresponding values for carapace. Our study shows properties are largely function highlights need integrate studies morphology performance.
Язык: Английский
Процитировано
3
Zoology, Год журнала: 2021, Номер 150, С. 125988 - 125988
Опубликована: Дек. 23, 2021
Язык: Английский
Процитировано
6
Journal of Crustacean Biology, Год журнала: 2021, Номер 41(3)
Опубликована: Июль 1, 2021
Abstract Despite the diversity in size, performance, and function of crustacean claws (chelae), our understanding functional morphology evolution these are lacking. Since crayfish multi-function organs that face selection from fighting, mating, foraging, predation, pressures all interact to shape performance. I studied a unique claw morphology, exaggerated gape New River crayfish, Cambarus chasmodactylusJames, 1966, by investigating how this relates strength fighting style. Claw length increased both males females as body size increased, although trend was more pronounced males, maximal females. describe behavior species relation previously speculate on changes have led species-specific Observations C. chasmodactylus revealed undescribed grasping behavior, which competitors grasp onto manus their opponent’s laterally twist flip opponent. When assessing relative role contest success male individuals, individuals with larger, but not necessarily stronger were most likely attain dominance. These results highlight provides initial evidence for form style within decapod crustaceans.
Язык: Английский
Процитировано
4
Frontiers in Marine Science, Год журнала: 2022, Номер 9
Опубликована: Ноя. 8, 2022
Deep-sea chemosynthesis-based ecosystems support unique biological communities, but human impacts are an increasing threat. Understanding the life-history traits of species from deep-sea can help to develop adequate management strategies, as these have on ecological responses changes in environment. Here we examined occurrence sexual dimorphism yeti crab Kiwa puravida , endemic Costa Rican Pacific margin that aggregates at active methane seeps and depends chemosynthetic bacteria for nutrition. The two morphological features included claws, suspected be under selection used defense, carpus second pereopod not selection. A total 258 specimens, 161 males, 81 females, 16 juveniles, were collected Mound 12 1,000-1,040 m depth 2017 2018 analyzed. We found males larger wider claws than while there no differences length. These results suggest claw weaponry is K . which probably related mating system this species. This first attempt study reproductive biology additional observations will necessary shed more light matter.
Язык: Английский
Процитировано
3