A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/98707 |
Resumo: | Theodoxus fluviatilis is a common gastropod in many karstic springs in central Portugal. We investigated the possible reasons for the near-total restriction of this species to these springs. We first determined the spatial distribution of the species within a spring (Anc¸os) and related the densities at sampling-patch scales to selected physical and chemical variables. We then determined the densities at several locations downstream from the spring and related these densities to selected physical and chemical variables. Finally, we assessed the population dynamics of the gastropod in the spring. In the spring, T. fluviatilis was more abundant in shallow areas with a rapid current and cobble-boulder substrates. In June-July 2006, the mean densities of T. fluviatilis in the spring varied from ∼ 10 to ∼ 9000 individuals m–2 but decreased to zero 3800 m downstream. The physical and chemical changes along the stretch studied were minor; no significant correlations (Spearman rank correlation; p > 0.05) were observed between the gastropod abundances and the measured environmental variables or the PCA axes. In the spring, juveniles and egg masses were observed year-round, suggesting continuous reproduction. The temperature at the spring was fairly constant, ranging from 15.3 to 16.6 ◦C during the year (daily variation < 0.1 ◦C). Nine hundred metres farther downstream, the daily temperature variation reached 5 ◦C. We propose that the high densities of T. fluviatilis in the Anc¸os spring are maintained by continuous recruitment mediated by the constant high temperature. |
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A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springsSecondary productionsubstratepopulation dynamicsPortugalmacroinvertebratesTheodoxus fluviatilis is a common gastropod in many karstic springs in central Portugal. We investigated the possible reasons for the near-total restriction of this species to these springs. We first determined the spatial distribution of the species within a spring (Anc¸os) and related the densities at sampling-patch scales to selected physical and chemical variables. We then determined the densities at several locations downstream from the spring and related these densities to selected physical and chemical variables. Finally, we assessed the population dynamics of the gastropod in the spring. In the spring, T. fluviatilis was more abundant in shallow areas with a rapid current and cobble-boulder substrates. In June-July 2006, the mean densities of T. fluviatilis in the spring varied from ∼ 10 to ∼ 9000 individuals m–2 but decreased to zero 3800 m downstream. The physical and chemical changes along the stretch studied were minor; no significant correlations (Spearman rank correlation; p > 0.05) were observed between the gastropod abundances and the measured environmental variables or the PCA axes. In the spring, juveniles and egg masses were observed year-round, suggesting continuous reproduction. The temperature at the spring was fairly constant, ranging from 15.3 to 16.6 ◦C during the year (daily variation < 0.1 ◦C). Nine hundred metres farther downstream, the daily temperature variation reached 5 ◦C. We propose that the high densities of T. fluviatilis in the Anc¸os spring are maintained by continuous recruitment mediated by the constant high temperature.3F10-AC72-52D0 | Verónica Ferreirainfo:eu-repo/semantics/publishedVersion2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/98707http://hdl.handle.net/10316/98707eng0213-84092-s2.0-84871958154cv-prod-702514Graça, Manuel A. S.Serra, Sónia R. Q.Ferreira, Verónicainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-02-08T12:14:41Zoai:estudogeral.uc.pt:10316/98707Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:16:27.403559Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
title |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
spellingShingle |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs Graça, Manuel A. S. Secondary production substrate population dynamics Portugal macroinvertebrates |
title_short |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
title_full |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
title_fullStr |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
title_full_unstemmed |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
title_sort |
A stable temperature may favour continuous reproduction by Theodoxus fluviatilis and explain its high densities in some karstic springs |
author |
Graça, Manuel A. S. |
author_facet |
Graça, Manuel A. S. Serra, Sónia R. Q. Ferreira, Verónica |
author_role |
author |
author2 |
Serra, Sónia R. Q. Ferreira, Verónica |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Graça, Manuel A. S. Serra, Sónia R. Q. Ferreira, Verónica |
dc.subject.por.fl_str_mv |
Secondary production substrate population dynamics Portugal macroinvertebrates |
topic |
Secondary production substrate population dynamics Portugal macroinvertebrates |
description |
Theodoxus fluviatilis is a common gastropod in many karstic springs in central Portugal. We investigated the possible reasons for the near-total restriction of this species to these springs. We first determined the spatial distribution of the species within a spring (Anc¸os) and related the densities at sampling-patch scales to selected physical and chemical variables. We then determined the densities at several locations downstream from the spring and related these densities to selected physical and chemical variables. Finally, we assessed the population dynamics of the gastropod in the spring. In the spring, T. fluviatilis was more abundant in shallow areas with a rapid current and cobble-boulder substrates. In June-July 2006, the mean densities of T. fluviatilis in the spring varied from ∼ 10 to ∼ 9000 individuals m–2 but decreased to zero 3800 m downstream. The physical and chemical changes along the stretch studied were minor; no significant correlations (Spearman rank correlation; p > 0.05) were observed between the gastropod abundances and the measured environmental variables or the PCA axes. In the spring, juveniles and egg masses were observed year-round, suggesting continuous reproduction. The temperature at the spring was fairly constant, ranging from 15.3 to 16.6 ◦C during the year (daily variation < 0.1 ◦C). Nine hundred metres farther downstream, the daily temperature variation reached 5 ◦C. We propose that the high densities of T. fluviatilis in the Anc¸os spring are maintained by continuous recruitment mediated by the constant high temperature. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/98707 http://hdl.handle.net/10316/98707 |
url |
http://hdl.handle.net/10316/98707 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0213-8409 2-s2.0-84871958154 cv-prod-702514 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799134060716490752 |