The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis )
Locomotion in any environment requires the use of energy to overcome the physical forces inherent in the environment. Most large marine vertebrates have evolved streamlined fusiform body shapes to minimize the resistive force of drag when in a neutral position, but nearly all behaviors result in som...
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ftdukeunivdsp:oai:localhost:10161/3088 2023-11-12T04:16:47+01:00 The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) Nousek McGregor, Anna Elizabeth Nowacek, Douglas P. 2010 application/pdf https://hdl.handle.net/10161/3088 unknown https://hdl.handle.net/10161/3088 Conservation Biology Ecology Biomechanics behavior Eubalaena glacialis hydrodynamics locomotor costs marine mammal North Atlantic right whale Dissertation 2010 ftdukeunivdsp 2023-10-17T09:39:04Z Locomotion in any environment requires the use of energy to overcome the physical forces inherent in the environment. Most large marine vertebrates have evolved streamlined fusiform body shapes to minimize the resistive force of drag when in a neutral position, but nearly all behaviors result in some increase in that force. Too much energy devoted to locomotion may reduce the available surplus necessary for population-level factors such as reproduction. The population of North Atlantic right whales has not recovered following legal protection due to decreased fecundity, including an increase in the intercalf interval, an increase in the years to first calf and an increase in the number of nulliparous females in the population. This reproductive impairment appears to be related to deficiencies in storing enough energy to meet the costs of reproduction. The goal of this study was to determine whether increases in moving between prey patches at the cost of decreased foraging opportunities could shift these whales into a situation of negative energy gain. The first step is to understand the locomotor costs for this species for the key behaviors of traveling and foraging. This study investigated the cost of locomotion in right whales by recording the submerged diving behaviors of free-ranging individuals in both their foraging habitat in the Bay of Fundy and their calving grounds in the South Atlantic Bight with a suction-cupped archival tag. The data from the tags were used to quantify the oc- currence of different behaviors and their associated swimming behaviors and explore three behavioral strategies that reduce locomotor costs. First, the influence that changes in blubber thickness has on the buoyancy of these whales was investigated by comparing the descent and ascent glide durations of individual whales with differ- ent blubber thicknesses. Next, the depth of surface dives made by animals of different sizes was related to the depth where additional wave drag is generated. Finally, the use of intermittent ... Doctoral or Postdoctoral Thesis Eubalaena glacialis North Atlantic North Atlantic right whale Duke University Libraries: DukeSpace |
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Duke University Libraries: DukeSpace |
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ftdukeunivdsp |
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Conservation Biology Ecology Biomechanics behavior Eubalaena glacialis hydrodynamics locomotor costs marine mammal North Atlantic right whale |
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Conservation Biology Ecology Biomechanics behavior Eubalaena glacialis hydrodynamics locomotor costs marine mammal North Atlantic right whale Nousek McGregor, Anna Elizabeth The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
topic_facet |
Conservation Biology Ecology Biomechanics behavior Eubalaena glacialis hydrodynamics locomotor costs marine mammal North Atlantic right whale |
description |
Locomotion in any environment requires the use of energy to overcome the physical forces inherent in the environment. Most large marine vertebrates have evolved streamlined fusiform body shapes to minimize the resistive force of drag when in a neutral position, but nearly all behaviors result in some increase in that force. Too much energy devoted to locomotion may reduce the available surplus necessary for population-level factors such as reproduction. The population of North Atlantic right whales has not recovered following legal protection due to decreased fecundity, including an increase in the intercalf interval, an increase in the years to first calf and an increase in the number of nulliparous females in the population. This reproductive impairment appears to be related to deficiencies in storing enough energy to meet the costs of reproduction. The goal of this study was to determine whether increases in moving between prey patches at the cost of decreased foraging opportunities could shift these whales into a situation of negative energy gain. The first step is to understand the locomotor costs for this species for the key behaviors of traveling and foraging. This study investigated the cost of locomotion in right whales by recording the submerged diving behaviors of free-ranging individuals in both their foraging habitat in the Bay of Fundy and their calving grounds in the South Atlantic Bight with a suction-cupped archival tag. The data from the tags were used to quantify the oc- currence of different behaviors and their associated swimming behaviors and explore three behavioral strategies that reduce locomotor costs. First, the influence that changes in blubber thickness has on the buoyancy of these whales was investigated by comparing the descent and ascent glide durations of individual whales with differ- ent blubber thicknesses. Next, the depth of surface dives made by animals of different sizes was related to the depth where additional wave drag is generated. Finally, the use of intermittent ... |
author2 |
Nowacek, Douglas P. |
format |
Doctoral or Postdoctoral Thesis |
author |
Nousek McGregor, Anna Elizabeth |
author_facet |
Nousek McGregor, Anna Elizabeth |
author_sort |
Nousek McGregor, Anna Elizabeth |
title |
The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
title_short |
The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
title_full |
The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
title_fullStr |
The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
title_full_unstemmed |
The cost of locomotion in North Atlantic right whales ( Eubalaena glacialis ) |
title_sort |
cost of locomotion in north atlantic right whales ( eubalaena glacialis ) |
publishDate |
2010 |
url |
https://hdl.handle.net/10161/3088 |
genre |
Eubalaena glacialis North Atlantic North Atlantic right whale |
genre_facet |
Eubalaena glacialis North Atlantic North Atlantic right whale |
op_relation |
https://hdl.handle.net/10161/3088 |
_version_ |
1782333851514699776 |