Direct effects of physical stress can be counteracted by indirect benefits: Oyster growth on a tidal elevation gradient

Melanie J. Bishop, Charles H. Peterson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The paradigmatic gradient for intertidal marine organisms of increasing physical stress from low to high elevation has long served as the basis for using direct effects of duration of water coverage to predict many biological patterns. Accordingly, changes in potential feeding time may predict the direction and magnitude of differences between elevations in individual growth rates of sessile marine invertebrates. Oysters (triploid Crassostrea ariakensis) experimentally introduced at intertidal (MLW + 0.05 m) and subtidal (MLW-0.25 m) elevations in racks provided a test of the ability to use duration of water coverage to predict changes in growth. During early-to-mid winter, a depression of 38-47% in shell growth of intertidal oysters matched the 36% reduction in available feeding time relative to subtidal oysters. In late winter as solar heating of exposed oysters increased, growth differences of 52-55% departed only slightly from the predicted 39%. In spring, however, duration of water coverage failed to predict even the correct direction of growth change with elevation as intertidal oysters grew 34% faster despite 39% less feeding time. Intense seasonal development of shell fouling by other suspension feeders like ascidians, mussels, and barnacles on subtidal (94% incidence) but not on aerially exposed intertidal (21-38% incidence) oysters may explain why duration of water cover failed to predict spring growth differences. Less intense fouling develops on intertidal oysters due to the physiological stress of aerial exposure on settlers, especially during higher temperatures and longer solar exposures of spring. Fouling by suspension feeders is known to reduce growth of the host through localized competition for food and added energetic costs. Thus, in springtime, indirect effects of aerial exposure providing a partial refuge from biological enemies overwhelmed direct effects of reduced duration of water coverage to reverse the expected pattern of slower intertidal growth of a marine invertebrate.

LanguageEnglish
Pages426-433
Number of pages8
JournalOecologia
Volume147
Issue number3
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

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oysters
fouling
duration
shell (molluscs)
angle of incidence
water
Crassostrea ariakensis
invertebrate
invertebrates
shell
seasonal development
winter
Ascidiacea
Cirripedia
effect
triploidy
refuge
mussels
energetics
heat

Cite this

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title = "Direct effects of physical stress can be counteracted by indirect benefits: Oyster growth on a tidal elevation gradient",
abstract = "The paradigmatic gradient for intertidal marine organisms of increasing physical stress from low to high elevation has long served as the basis for using direct effects of duration of water coverage to predict many biological patterns. Accordingly, changes in potential feeding time may predict the direction and magnitude of differences between elevations in individual growth rates of sessile marine invertebrates. Oysters (triploid Crassostrea ariakensis) experimentally introduced at intertidal (MLW + 0.05 m) and subtidal (MLW-0.25 m) elevations in racks provided a test of the ability to use duration of water coverage to predict changes in growth. During early-to-mid winter, a depression of 38-47{\%} in shell growth of intertidal oysters matched the 36{\%} reduction in available feeding time relative to subtidal oysters. In late winter as solar heating of exposed oysters increased, growth differences of 52-55{\%} departed only slightly from the predicted 39{\%}. In spring, however, duration of water coverage failed to predict even the correct direction of growth change with elevation as intertidal oysters grew 34{\%} faster despite 39{\%} less feeding time. Intense seasonal development of shell fouling by other suspension feeders like ascidians, mussels, and barnacles on subtidal (94{\%} incidence) but not on aerially exposed intertidal (21-38{\%} incidence) oysters may explain why duration of water cover failed to predict spring growth differences. Less intense fouling develops on intertidal oysters due to the physiological stress of aerial exposure on settlers, especially during higher temperatures and longer solar exposures of spring. Fouling by suspension feeders is known to reduce growth of the host through localized competition for food and added energetic costs. Thus, in springtime, indirect effects of aerial exposure providing a partial refuge from biological enemies overwhelmed direct effects of reduced duration of water coverage to reverse the expected pattern of slower intertidal growth of a marine invertebrate.",
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Direct effects of physical stress can be counteracted by indirect benefits : Oyster growth on a tidal elevation gradient. / Bishop, Melanie J.; Peterson, Charles H.

In: Oecologia, Vol. 147, No. 3, 03.2006, p. 426-433.

Research output: Contribution to journalArticleResearchpeer-review

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