The effects of reduced pH on decorator crab morphology, physiology and behavior
Crabs in the family Majoidae camouflage by decorating their exoskeletons with organisms and debris from their environment. This form of camouflage, involving both the act of decorating and carrying of these decorations, is thought to be energetically costly, and may present a trade-off under stressf...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
eScholarship, University of California
2017
|
Subjects: | |
Online Access: | http://www.escholarship.org/uc/item/3hn315j1 |
id |
ftcdlib:qt3hn315j1 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:qt3hn315j1 2023-05-15T17:50:57+02:00 The effects of reduced pH on decorator crab morphology, physiology and behavior Rankin, Ashley Lynn 56 2017-01-01 application/pdf http://www.escholarship.org/uc/item/3hn315j1 en eng eScholarship, University of California http://www.escholarship.org/uc/item/3hn315j1 qt3hn315j1 public Rankin, Ashley Lynn. (2017). The effects of reduced pH on decorator crab morphology, physiology and behavior. UC San Diego: Marine biology. Retrieved from: http://www.escholarship.org/uc/item/3hn315j1 Environmental science Biology acidification behavior climate change crab morphology physiology dissertation 2017 ftcdlib 2018-01-26T23:54:23Z Crabs in the family Majoidae camouflage by decorating their exoskeletons with organisms and debris from their environment. This form of camouflage, involving both the act of decorating and carrying of these decorations, is thought to be energetically costly, and may present a trade-off under stressful environmental conditions. The energetic cost of decoration behavior has been evinced by reduced organic content due to elevated metabolism. In the context of previous research demonstrating that many marine calcifiers experience metabolic costs under experimental ocean acidification conditions, we hypothesized that decorator crabs exposed to reduced pH will have insufficient energy to support regulatory processes along with decoration behavior. Thus, we predicted that energy will be allocated towards growth and calcification at the expense of decoration behavior. Dwarf teardrop crabs, Pelia tumida, were exposed to ambient (pH=8.0, pCO2=613 µatm) and reduced (pH=7.75, pCO2= 894 µatm) pH conditions for five weeks. Half of the animals in each treatment were given two sponge species, Halichondria panacea and Haliclona permollis, to decorate with, whereas the remaining animals were not allowed to decorate. At the end of the experiment, all animals were analyzed for exoskeleton mineral content (Ca and Mg) using EDX and ICP-MS, organic content (a proxy for metabolism) using TGA, and decoration behavior by quantifying sponge mass and percent cover. Overall, decorator crabs showed no signs of energy limitation under reduced pH conditions. Neither growth, exoskeleton mineral content, nor organic content of crabs differed among pH or decoration treatments. In addition, both sponge mass and percent cover remained the same across pH treatments, indicating no effect of reduced pH on decoration behavior, and thus the ability to camouflage. The maintenance of physiological processes without metabolic costs in P. tumida exposed to reduced pH radiates from the emerging trends on the susceptibility of crustaceans to changes in ocean chemistry associated with ocean acidification. Doctoral or Postdoctoral Thesis Ocean acidification University of California: eScholarship Pelia ENVELOPE(15.840,15.840,68.776,68.776) Teardrop ENVELOPE(163.917,163.917,-78.150,-78.150) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Environmental science Biology acidification behavior climate change crab morphology physiology |
spellingShingle |
Environmental science Biology acidification behavior climate change crab morphology physiology Rankin, Ashley Lynn The effects of reduced pH on decorator crab morphology, physiology and behavior |
topic_facet |
Environmental science Biology acidification behavior climate change crab morphology physiology |
description |
Crabs in the family Majoidae camouflage by decorating their exoskeletons with organisms and debris from their environment. This form of camouflage, involving both the act of decorating and carrying of these decorations, is thought to be energetically costly, and may present a trade-off under stressful environmental conditions. The energetic cost of decoration behavior has been evinced by reduced organic content due to elevated metabolism. In the context of previous research demonstrating that many marine calcifiers experience metabolic costs under experimental ocean acidification conditions, we hypothesized that decorator crabs exposed to reduced pH will have insufficient energy to support regulatory processes along with decoration behavior. Thus, we predicted that energy will be allocated towards growth and calcification at the expense of decoration behavior. Dwarf teardrop crabs, Pelia tumida, were exposed to ambient (pH=8.0, pCO2=613 µatm) and reduced (pH=7.75, pCO2= 894 µatm) pH conditions for five weeks. Half of the animals in each treatment were given two sponge species, Halichondria panacea and Haliclona permollis, to decorate with, whereas the remaining animals were not allowed to decorate. At the end of the experiment, all animals were analyzed for exoskeleton mineral content (Ca and Mg) using EDX and ICP-MS, organic content (a proxy for metabolism) using TGA, and decoration behavior by quantifying sponge mass and percent cover. Overall, decorator crabs showed no signs of energy limitation under reduced pH conditions. Neither growth, exoskeleton mineral content, nor organic content of crabs differed among pH or decoration treatments. In addition, both sponge mass and percent cover remained the same across pH treatments, indicating no effect of reduced pH on decoration behavior, and thus the ability to camouflage. The maintenance of physiological processes without metabolic costs in P. tumida exposed to reduced pH radiates from the emerging trends on the susceptibility of crustaceans to changes in ocean chemistry associated with ocean acidification. |
format |
Doctoral or Postdoctoral Thesis |
author |
Rankin, Ashley Lynn |
author_facet |
Rankin, Ashley Lynn |
author_sort |
Rankin, Ashley Lynn |
title |
The effects of reduced pH on decorator crab morphology, physiology and behavior |
title_short |
The effects of reduced pH on decorator crab morphology, physiology and behavior |
title_full |
The effects of reduced pH on decorator crab morphology, physiology and behavior |
title_fullStr |
The effects of reduced pH on decorator crab morphology, physiology and behavior |
title_full_unstemmed |
The effects of reduced pH on decorator crab morphology, physiology and behavior |
title_sort |
effects of reduced ph on decorator crab morphology, physiology and behavior |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
http://www.escholarship.org/uc/item/3hn315j1 |
op_coverage |
56 |
long_lat |
ENVELOPE(15.840,15.840,68.776,68.776) ENVELOPE(163.917,163.917,-78.150,-78.150) |
geographic |
Pelia Teardrop |
geographic_facet |
Pelia Teardrop |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Rankin, Ashley Lynn. (2017). The effects of reduced pH on decorator crab morphology, physiology and behavior. UC San Diego: Marine biology. Retrieved from: http://www.escholarship.org/uc/item/3hn315j1 |
op_relation |
http://www.escholarship.org/uc/item/3hn315j1 qt3hn315j1 |
op_rights |
public |
_version_ |
1766157895148240896 |