Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean

Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean

Gracilaria cornea and G. crassissima are similar species that coexist at Bajo Pepito in the Mexican Caribbean. Differences in agar properties from both species were determined for two reproductive categories: carposporic and undetermined, the latter mainly composed of tetrasporophytes. Agar yield (A...

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मुख्य लेखकों: Espinoza-Avalos, J, Hernández-Garibay, E, Zertuche-González, JA, Meave-del-Castillo, ME
स्वरूप: Online
भाषा:eng
प्रकाशित: Iniversidad Autónoma de Baja California 2003
ऑनलाइन पहुंच:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/144
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id oai:cienciasmarinas.com.mx:article-144
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Espinoza-Avalos, J
Hernández-Garibay, E
Zertuche-González, JA
Meave-del-Castillo, ME
spellingShingle Espinoza-Avalos, J
Hernández-Garibay, E
Zertuche-González, JA
Meave-del-Castillo, ME
Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
author_facet Espinoza-Avalos, J
Hernández-Garibay, E
Zertuche-González, JA
Meave-del-Castillo, ME
author_sort Espinoza-Avalos, J
title Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
title_short Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
title_full Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
title_fullStr Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
title_full_unstemmed Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean
title_sort agar from two coexisting species of gracilaria (gracilariaceae) from the mexican caribbean
description Gracilaria cornea and G. crassissima are similar species that coexist at Bajo Pepito in the Mexican Caribbean. Differences in agar properties from both species were determined for two reproductive categories: carposporic and undetermined, the latter mainly composed of tetrasporophytes. Agar yield (AY), agar gel strength (GS), 3,6-anhydrogalactose content (AG) and sulfate content (S) of native and alkali-treated agar were determined for both reproductive categories. Significant differences in native and alkali-treated agar between the reproductive categories were recorded for AY, GS and S from G. cornea and G. crassissima, as well as for AG of native agar from the latter species. Our results, and previous studies, demonstrate that neither reproductive stage was predominant over the other(s) in terms of having greater or lower values of agar properties. The potential economic use of agar differences from plants of different reproductive stage remains very limited. Lower AY and GS were found for G. cornea from the Caribbean side of the Yucatan peninsula (this study), in comparison to agar values reported for the Gulf of Mexico side of the peninsula. Warmer and nutrient-poorer waters on the Caribbean side could cause those differences. No pattern for GS or S was found when these two and other tropical species of Gracilariaceae were compared to temperate species. When plants of both reproductive categories were pooled together for each Gracilaria species, significant differences were found in all agar properties. Interspecific and intraspecific differences between and within species of Gracilariaceae have also been found for phenological events. We suggest that the coexistence of G. cornea and G. crassissima requires different phenological responses by each species to the environment at Bajo Pepito, which in turn could be reflected in differences in the agar properties we measured, both at the interspecific and intraspecific levels.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/144
_version_ 1715723935546343424
spelling oai:cienciasmarinas.com.mx:article-1442019-04-26T19:44:48Z Agar from two coexisting species of Gracilaria (Gracilariaceae) from the Mexican Caribbean Agar de dos especies coexistentes de Gracilaria (Gracilariaceae) del Caribe mexicano Espinoza-Avalos, J Hernández-Garibay, E Zertuche-González, JA Meave-del-Castillo, ME Gracilaria spp agar reproductive phases seasonal changes Yucatan Peninsula Gracilaria spp agar fases reproductivas cambios estacionales Península de Yucatán Gracilaria cornea and G. crassissima are similar species that coexist at Bajo Pepito in the Mexican Caribbean. Differences in agar properties from both species were determined for two reproductive categories: carposporic and undetermined, the latter mainly composed of tetrasporophytes. Agar yield (AY), agar gel strength (GS), 3,6-anhydrogalactose content (AG) and sulfate content (S) of native and alkali-treated agar were determined for both reproductive categories. Significant differences in native and alkali-treated agar between the reproductive categories were recorded for AY, GS and S from G. cornea and G. crassissima, as well as for AG of native agar from the latter species. Our results, and previous studies, demonstrate that neither reproductive stage was predominant over the other(s) in terms of having greater or lower values of agar properties. The potential economic use of agar differences from plants of different reproductive stage remains very limited. Lower AY and GS were found for G. cornea from the Caribbean side of the Yucatan peninsula (this study), in comparison to agar values reported for the Gulf of Mexico side of the peninsula. Warmer and nutrient-poorer waters on the Caribbean side could cause those differences. No pattern for GS or S was found when these two and other tropical species of Gracilariaceae were compared to temperate species. When plants of both reproductive categories were pooled together for each Gracilaria species, significant differences were found in all agar properties. Interspecific and intraspecific differences between and within species of Gracilariaceae have also been found for phenological events. We suggest that the coexistence of G. cornea and G. crassissima requires different phenological responses by each species to the environment at Bajo Pepito, which in turn could be reflected in differences in the agar properties we measured, both at the interspecific and intraspecific levels. Gracilaria cornea y G. crassissima son especies muy similares que coexisten en el Bajo Pepito, Caribe mexicano. Para ambas especies se determinaron propiedades del agar de dos categorías reproductivas: carpospórica e indeterminada, la última compuesta principalmente por tetrasporofitos. Las propiedades del agar medidas fueron el rendimiento de agar (RA), fuerza de gel (FG), contenido de 3,6-anhidrogalactosa (AG) y sulfatos (S) de agar nativo y con tratamiento alcalino. Para agar nativo y alcalino se registraron diferencias significativas de RA, FG y S entre las categorías reproductivas de G. cornea y G. crassissima, lo mismo que para AG del agar nativo de la segunda especie. Nuestros resultados y estudios previos demuestran que ninguna fase reproductiva predomina sobre otra(s), con relación a tener valores mayores o menores en las propiedades del agar. El valor económico potencial de las diferencias del agar de plantas en distinta fase reproductiva permanece muy limitado. Encontramos valores menores de RA y FG para G. cornea del litoral Caribe de la Península de Yucatán, en comparación con aquellos reportados para el litoral del Golfo de México de la península. Aguas más cálidas y oligotróficas en el litoral del Caribe pueden causar estas diferencias. No se encontró un patrón en la FG y el S cuando estas dos y otras especies tropicales se compararon con especies de Gracilariaceae templadas. Se registraron diferencias significativas entre especies en todas las propiedades del agar, cuando se juntaron plantas de las dos categorías reproductivas de cada especie de Gracilaria. También se han encontrado diferencias interespecíficas e intraespecíficas en especies de Gracilariaceae en eventos fenológicos. Se sugiere que la coexistencia de G. cornea y G. crassissima requiere que éstas posean respuestas fenológicas diferentes al ambiente de el Bajo Pepito, lo que a su vez se refleja en diferencias del agar, a niveles interespecífico e intraespecífico. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/144 10.7773/cm.v29i2.144 Ciencias Marinas; Vol. 29 No. 2 (2003); 221-228 Ciencias Marinas; Vol. 29 Núm. 2 (2003); 221-228 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/144/120

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