Population changes in a northern Gulf of California rocky intertidal invertebrate community before and after the 1997--1998 ENSO event

Persistent Link:
http://hdl.handle.net/10150/278712
Title:
Population changes in a northern Gulf of California rocky intertidal invertebrate community before and after the 1997--1998 ENSO event
Author:
Chandler, Margaret Ann
Issue Date:
1999
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A study was done on a rocky intertidal community in Puerto Penasco, Sonora, Mexico in the summers of 1997--1999 in order to determine if the ENSO of 1997--1998 had an effect on population densities of selected macroinvertebrates. Two replicate transects were laid perpendicular to the sea edge and a census of 21 macroinvertebrate species was taken in the summers of 1997, 1998 and 1999. A significant decrease of species densities occurred in 1998 when the mean sea surface temperature (SST) was more than 2°C warmer than in 1997 due to the 1997--1998 ENSO event. A phenomenon was also observed in 1998 where some species changed, compared to 1997, their vertical distribution in the intertidal from shallow to deeper waters, with a subsequent return to a more expected distribution in 1999. Also a comparison of 1997 and 1976 densities showed an increase in 1997 in abundances of those species with southern geographic ranges and a decrease of those with northern geographic ranges. This was correlated with an increase of mean SST of 1.9°C between the 1970's and the 1990's.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Biology, Ecology.; Biology, Oceanography.; Biology, Zoology.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Biochemistry
Degree Grantor:
University of Arizona
Advisor:
Thomson, Donald A.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titlePopulation changes in a northern Gulf of California rocky intertidal invertebrate community before and after the 1997--1998 ENSO eventen_US
dc.creatorChandler, Margaret Annen_US
dc.contributor.authorChandler, Margaret Annen_US
dc.date.issued1999en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA study was done on a rocky intertidal community in Puerto Penasco, Sonora, Mexico in the summers of 1997--1999 in order to determine if the ENSO of 1997--1998 had an effect on population densities of selected macroinvertebrates. Two replicate transects were laid perpendicular to the sea edge and a census of 21 macroinvertebrate species was taken in the summers of 1997, 1998 and 1999. A significant decrease of species densities occurred in 1998 when the mean sea surface temperature (SST) was more than 2°C warmer than in 1997 due to the 1997--1998 ENSO event. A phenomenon was also observed in 1998 where some species changed, compared to 1997, their vertical distribution in the intertidal from shallow to deeper waters, with a subsequent return to a more expected distribution in 1999. Also a comparison of 1997 and 1976 densities showed an increase in 1997 in abundances of those species with southern geographic ranges and a decrease of those with northern geographic ranges. This was correlated with an increase of mean SST of 1.9°C between the 1970's and the 1990's.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectBiology, Ecology.en_US
dc.subjectBiology, Oceanography.en_US
dc.subjectBiology, Zoology.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineBiochemistryen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorThomson, Donald A.en_US
dc.identifier.proquest1398036en_US
dc.identifier.bibrecord.b40274019en_US
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