Simulated heatwave and fishing stressors alter corticosteroid and energy balance in neonate blacktip reef sharks, Carcharhinus melanopterus.
نویسندگان
چکیده
Abstract The increasing frequency and duration of marine heatwaves attributed to climate change threatens coastal elasmobranchs may exacerbate existing anthropogenic stressors. While the elasmobranch stress response has been well studied, role unique corticosteroid—1α-hydroxycorticosterone (1α-OHB)—in energy balance is not understood. Therefore, 1α-OHB’s utility as a biomarker in conservation physiology equivocal. Here, we analyse roles corticosteroids, 1α-OHB corticosterone, metabolites, glucose 3-hydroxybutyrate (3-HB), protected tropical shark species, blacktip reef (Carcharhinus melanopterus). Wild-caught neonates were exposed ambient (27°C) or heatwave conditions (29°C) subsequently simulated fishing stressor (1 min air exposure). Blood samples taken prior temperature exposure, 30 min, 1 h, 24 48 h post-air exposure at treatment temperatures. Plasma was elevated for 27°C-exposed sharks but declined over time 29°C-exposed sharks. correlated with either metabolite. higher plasma 3-HB lower In separate experiment, blood collected from both neonate adult immediately following capture again 5 later, analysed corticosteroids metabolites. increased within displayed concentrations than adults. We conclude that does serve classic glucocorticoid C. melanopterus under these Furthermore, show first time, ontogenetic differences 1α-OHB. Ultimately, our findings provide insights into hormonal control mobilization during melanopterus, particularly conditions, which seem alter endocrine mobilization. Further work needed determine event elasmobranchs.
منابع مشابه
Blacktip reef sharks (Carcharhinus melanopterus) show high capacity for wound healing and recovery following injury
Wound healing is important for sharks from the earliest life stages, for example, as the 'umbilical scar' in viviparous species heals, and throughout adulthood, when sharks can incur a range of external injuries from natural and anthropogenic sources. Despite anecdotal accounts of rapid healing in elasmobranchs, data regarding recovery and survival of individuals from different wound or injury ...
متن کاملLong-term movement patterns and trophic ecology of blacktip reef sharks (Carcharhinus melanopterus) at Palmyra Atoll
In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t a r t i c l e i n f o Animal movements, residence times, and subsequently foraging strategies, should vary w...
متن کاملMicrosatellite Analyses of Blacktip Reef Sharks (Carcharhinus melanopterus) in a Fragmented Environment Show Structured Clusters
The population dynamics of shark species are generally poorly described because highly mobile marine life is challenging to investigate. Here we investigate the genetic population structure of the blacktip reef shark (Carcharhinus melanopterus) in French Polynesia. Five demes were sampled from five islands with different inter-island distances (50-1500 km). Whether dispersal occurs between isla...
متن کاملAn Observation of Mating in Free-Ranging Blacktip Reef Sharks, Carcharhinus melanopterus
We describe the mating behavior of free-ranging Blacktip Reef Sharks, Carcharhinus melanopterus, at Palmyra Atoll. This is the first primary report of mating in C. melanopterus and the first direct observation of mating for an obligate swimming shark species. Similar to that in other nonobligate swimming shark species, mating in C. melanopterus was characterized by multiple males following a si...
متن کاملThe response of gastric pH and motility to fasting and feeding in free swimming blacktip reef sharks, Carcharhinus melanopterus
In many fish and reptiles, gastric digestion is responsible for the complete breakdown of prey items into semi-liquid chyme. The responses of the stomach to feeding and to periods of fasting are, however, unknown for many lower vertebrates. We inserted data loggers into the stomachs of free-swimming captive adult blacktip reef sharks (Carcharhinus melanopterus) to quantify gastric pH, motility ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Conservation Physiology
سال: 2021
ISSN: ['2051-1434']
DOI: https://doi.org/10.1093/conphys/coab067