Personality Traits of the Territorial Crustacean Chinese Mitten Crab (Eriocheir sinensis): Behavioral Adaptations to Environmental Cues

Animals, Journal Year: 2025, Volume and Issue: 15(5), P. 757 - 757

Published: March 6, 2025

Territorial crustaceans exhibit a complex set of personality traits and behavioral characteristics that are critical for their survival, growth, overall welfare. This study aimed to systematically investigate the interplay between two essential traits—boldness aggression—in Chinese mitten crabs (Eriocheir sinensis), during various developmental stages under conditions crowding stress food odor stimuli. Using assays, we found adults displayed significantly higher levels boldness aggression compared juveniles. Notably, bold adult demonstrated lower than shy counterparts, revealing significant negative correlation stress. Furthermore, juvenile exhibited correlations stability with individual aggression, respectively. The also while did not correlate body size, larger individuals stress, contrasting crabs, where negatively correlated although were unaffected by size; positive size These findings elucidate intricate dynamics in territorial crustaceans, laying groundwork future research into adaptive strategies response environmental cues like group odors.

Language: Английский

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Multiple Pathways of Visual Adaptations for Water Column Usage in an Antarctic Adaptive Radiation

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(3)

Published: March 1, 2025

ABSTRACT Evolutionary transitions in water column usage have played a major role shaping ray‐finned fish diversity. However, the extent to which vision‐associated trait complexity and is coupled remains unclear. Here we investigated relationship between depth niche, eye size, molecular basis of light detection across Antarctic notothenioid adaptive radiation. Integrating phylogenetic comparative framework with data on size occupancy, provide support for an acceleration rate diversification nearly 20 million years after initial Our results further reveal that levels divergence are often highest closely related taxa. We analyzed opsin tuning site sequences found changes representing repeated instances independent phylogeny generally not associated habitat or species size. Collectively, our strongly multiple evolutionary pathways underlie visual adaptations this iconic

Language: Английский

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Population Size and Spatial Distribution of the Mexican Blind Cavefish (Astyanax) within the Caves

Fishes, Journal Year: 2024, Volume and Issue: 9(9), P. 334 - 334

Published: Aug. 26, 2024

The most studied cavefish in the world is Astyanax mexicanus, and frequently used specimens research come from Pachón cave Northeast Mexico. A recent study using capture–mark–recapture technique revealed that population size only hundreds of individuals, not thousands. This result raises serious concerns about their long-term survival highlights need to accurately estimate other caves. In our study, we a well-established, non-invasive method for estimating size: transect sampling method, which counts abundance organisms along line at regular intervals. We 310 m long Sabinos Cave’s Pool #1 measurements estimated 1142 individuals. Most importantly, found are distributed uniformly: 68% individuals were clustered under bat roost. To corroborate this observation, drones explore submerged galleries inaccessible scientists. Results Toro/Calera Cave system confirmed essentially void cavefish, except those few areas with high amounts nutrients. Scientists visiting localities (Pachón, Sabinos, Tinaja, Chica) experience what appear be high-density populations 10 fish/m2, possibly because pool they visit happens roosts. Our shows one cannot extrapolate density these rest habitat, where densities might two orders magnitude lower. Future studies should consider apparent visited sites overrepresenting total when calculating number fish captured.

Language: Английский

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Chemosensory modulation of eye-body coordination in larval zebrafish

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 28, 2024

Abstract Coordinated eye-body movements are essential for many animal behaviors, yet the influence of chemosensory inputs on these remains underexplored. Here, we enhance Fish-On-Chips optofluidic platform to reveal that larval zebrafish use coupled saccade-tail flips avoidance, but not pursuit. Spontaneous saccades, which alternate in direction, closely synchronized with tail via anticipatory adjustments flip event rate, directionality, and kinematics. In response ethologically representative cues, this coordination is differentially modulated based valence. Aversive chemical cues increase saccade frequency proportion saccade-coupled flips, while also enhancing turning intent as coupling strengthens. Conversely, appetitive chemicals promote more sustained gliding without impacting saccades or their coupling. Brain-wide neuronal activity imaging reveals pallium, a cortical homolog teleosts, strongly represents sensorimotor transformation aversive cue-associated flips. Our findings underscore critical role regulating an early vertebrate species, highlighting deep evolutionary integration sensory optimize locomotion.

Language: Английский

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