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Title Temperature relations of Puget Sound thaids in reference to their intertidal distribution
Creator/Author Bertness, M.D. ; Schneider, D.E.
Publication Date1976 Jul 01
OSTI IdentifierOSTI ID: 7128051
Other Number(s)CODEN: VLGHA
Resource TypeJournal Article
Resource RelationVeliger ; Vol/Issue: 19:1
Research OrgWestern Washington State Coll., Bellingham
Subject520100 -- Environment, Aquatic-- Basic Studies-- (-1989) ;560204 -- Thermal Effects-- Invertebrates-- (-1987); ;SNAILS-- POPULATION DYNAMICS;SNAILS-- TEMPERATURE EFFECTS; AGE GROUPS;BEHAVIOR;BIOLOGICAL ADAPTATION;METABOLISM;RESPIRATION;SIZE;THERMAL STRESSES
Related SubjectANIMALS;AQUATIC ORGANISMS;INVERTEBRATES;MOLLUSCS;STRESSES
Description/Abstract The smaller individuals of the snails Thais lamellosa and Thais emarginata are found at the top of each species vertical range at shore-level.^T. emarginata was found higher in the intertidal zone than T. lamellosa.^The smaller thaids (surface area to volume ratio) occupied the most physical stressful portion of each species range and would be expected to be the most vulnerable to physical stress.^The higher intertidal T. emarginata showed the greatest thermal resistance, and within the T. lamellosa size classes the small snails had the highest thermal limits (in which humidity is an important factor).^Possibly the smaller snails could more effectively utilize evaporative cooling as a temperature regulating mechanism.^As indicated by the respiratory response, the higher intertidal T. emarginata and the small size class within each species displayed the most pronouced temperature independence.^Over a 0 to 30/sup 0/C temperature range, the highest temperatures at which T. emarginata and small and large size classes of T. lamellosa remained active correlated to their natural distribution and temperature regimes.^The distributional patterns were probably not the result of the observed adaptations to thermal stress.^Rather, the adaptations allow the populations to exhibit their inter- and intra-specific zonation difference.^The major effect of temperature stress on the thaids probably does not result from direct mortality, but from the sublethal effects of high temperatures that can cause coma, increased metabolic rate, and reduced mobility.^All of these factors potentially could have a detrimental effect on the competitive ability of the snails and therefore strengthen and reinforce the zonation patterns that are behaviorally established.^(RFC)
Country of PublicationUnited States
LanguageEnglish
FormatPages: 47-58
System Entry Date2001 May 13

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