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Salinity constrains size inequality and allometry in two contrasting mangrove habitats in the Gulf of Mexico

Published online by Cambridge University Press:  13 February 2012

Rodrigo Méndez-Alonzo ,
Humberto Hernández-Trejo  and
Jorge López-Portillo
Rodrigo Méndez-Alonzo
Affiliation:
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701 Col. Ex-Hacienda de San José de La Huerta, Morelia, Michoacán, 58190, México
Humberto Hernández-Trejo
Affiliation:
División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco. Carretera Villahermosa-Cárdenas Km. 0.5 S/N Entronque a Bosques de Saloya, Villahermosa, Tabasco, 86150México
Jorge López-Portillo*
Affiliation:
Red de Ecología Funcional, Instituto de Ecología, A. C., Carretera antigua a Coatepec 351, Xalapa Veracruz, 91070México
*
1Corresponding author. Email: jorge.lopez.portillo@inecol.edu.mx
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Abstract:

The competition for resources increases size inequality in trees, particularly under low abiotic stress. Because mangrove communities are subject to site-specific salinity (and therefore abiotic stress) gradients, these habitats should differ in height–diameter allometry and size inequality. The size inequality (by the Gini Coefficient, G) and maximum potential height (Hmax from a height–diameter asymptotic model) were determined within the mangrove forest of a coastal lagoon in Veracruz, Mexico in 20 0.25-ha plots, 10 in interdistributary basins (IBs, lower salinity) having Avicennia germinans, Laguncularia racemosa and Rhizophora mangle and 10 in mudflats (MFs, higher salinity) dominated by A. germinans. Size inequality was significantly higher in IBs (G = 0.59 ± 0.02 vs. 0.39 ± 0.03). Due to their significant intercorrelation G, total basal area and density were synthesized in one PCA axis accounting for 67% of total variance and inversely correlated with salinity (R = −0.65, P = 0.003). The height–diameter scaling model reached a stable asymptote (Hmax range: 16–21 m; coefficient of variation CV: 7.7) in IBs, suggesting that trees can still increase their diameter after achieving maximum height. In MFs, no stable asymptote was reached (Hmax range: 11–26 m; CV: 32.5), suggesting a lower growth rate of diameter in the MF trees when compared with IB trees.

Keywords

Avicennia germinansGini coefficientLaguncularia racemosaMexicoplant allometryRhizophora manglesize-asymmetric competitionsize hierarchiestree densityVeracruz
Type
Research Article
Information
Journal of Tropical Ecology , Volume 28 , Issue 2 , March 2012 , pp. 171 - 179
Copyright
Copyright © Cambridge University Press 2012

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References

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