TY - JOUR
T1 - Thermal imaging reveals changes in body surface temperatures of blacktip sharks (Carcharhinus limbatus) during air exposure
AU - Wosnick, Natascha
AU - Navas, Carlos A.
AU - Niella, Yuri V.
AU - Monteiro-Filho, Emygdio L. A.
AU - Freire, Carolina Arruda
AU - Hammerschlag, Neil
PY - 2018/9/1
Y1 - 2018/9/1
N2 - Fish physiology is significantly affected by temperature variability. During fisheries interactions, fish are often exposed to air and subjected to rapid temperature changes. Fish thermal dynamics during such exposure, and the possible outcomes to their physiology, depend on how heat is distributed across their bodies, the speed at which their body temperatures change, and the size of the individual. Nevertheless, such thermal patterns remain unknown for sharks. This study employed a novel application of thermal imaging to evaluate external body temperature profiles of blacktip sharks (Carcharhinus limbatus) above-water exposure after capture. We found that above-water exposure duration, shark total length, and air temperature on the day of capture significantly influenced body surface temperatures of the analyzed sharks (N=28). Body surface temperature significantly increased with increasing exposure; however, thermal profiles of immature sharks (<140 cm) were significantly warmer than those
of mature sharks. Moreover, blacktip surface body temperatures
were significantly higher during days when air temperatures were
at least 2.5°C warmer than water temperatures. We discuss these
results as they relate to the ecology of blacktip sharks and their
potential vulnerability to fisheries capture due to such changes in
peripheral body temperature.
AB - Fish physiology is significantly affected by temperature variability. During fisheries interactions, fish are often exposed to air and subjected to rapid temperature changes. Fish thermal dynamics during such exposure, and the possible outcomes to their physiology, depend on how heat is distributed across their bodies, the speed at which their body temperatures change, and the size of the individual. Nevertheless, such thermal patterns remain unknown for sharks. This study employed a novel application of thermal imaging to evaluate external body temperature profiles of blacktip sharks (Carcharhinus limbatus) above-water exposure after capture. We found that above-water exposure duration, shark total length, and air temperature on the day of capture significantly influenced body surface temperatures of the analyzed sharks (N=28). Body surface temperature significantly increased with increasing exposure; however, thermal profiles of immature sharks (<140 cm) were significantly warmer than those
of mature sharks. Moreover, blacktip surface body temperatures
were significantly higher during days when air temperatures were
at least 2.5°C warmer than water temperatures. We discuss these
results as they relate to the ecology of blacktip sharks and their
potential vulnerability to fisheries capture due to such changes in
peripheral body temperature.
KW - conservation physiology
KW - fishing physiology
KW - thermal stress
KW - infrared thermography
KW - elasmobranch
KW - Fishing physiology
KW - Infrared thermography
KW - Thermal stress
KW - Conservation physiology
KW - Elasmobranch
UR - http://www.scopus.com/inward/record.url?scp=85051215874&partnerID=8YFLogxK
U2 - 10.1086/699484
DO - 10.1086/699484
M3 - Article
C2 - 30074422
SN - 1522-2152
VL - 91
SP - 1005
EP - 1012
JO - Physiological and Biochemical Zoology
JF - Physiological and Biochemical Zoology
IS - 5
ER -