In:
Marine Mammal Science, Wiley, Vol. 39, No. 3 ( 2023-07), p. 976-993
Kurzfassung:
High‐resolution dive depth and acceleration recordings from nearshore (Sarasota Bay, dive depth 〈 30 m), and offshore (Bermuda) bottlenose dolphins ( Tursiops spp.) were used to estimate the diving metabolic rate (DMR) and the locomotor metabolic rate (LMR, L O 2 /min) during three phases of diving (descent, bottom, and ascent). For shallow dives (depth ≤ 30 m), we found no differences between the two ecotypes in the LMR during diving, nor during the postdive shallow interval between dives. For intermediate (30 m 〈 depth ≤ 100 m) and deep dives (depth 〉 100 m), the LMR was significantly higher during ascent than during descent and the bottom phase by 59% and 9%, respectively. In addition, the rate of change in depth during descent and ascent (meters/second) increased with maximal dive depth. The dynamic aerobic dive limit (dADL) was calculated from the estimated DMR and the estimated predive O 2 stores. For the Bermuda dolphins, the dADL decreased with dive depth, and was 18.7, 15.4, and 11.1 min for shallow, intermediate, and deep dives, respectively. These results provide a useful approach to understand the complex nature of physiological interactions between aerobic metabolism, energy use, and diving capacity.
Materialart:
Online-Ressource
ISSN:
0824-0469
,
1748-7692
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2023
ZDB Id:
12787-5
ZDB Id:
2218018-7
SSG:
12
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