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| Format: | Artículo científico |
| Language: | es |
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Universidad de Costa Rica
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=44933764010 |
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Table of Contents:
- Biomasa de Cornops aquaticum (Orthoptera: Acrididae) en humedales del nordeste de Argentina Luciana Irene Gallardo María Celeste Franceschini Alicia Susana Guadalupe Poi María Laura De Wysiecki Biología femur Dry weight Eichhornia water hyacinth regression model The estimation of biomass in insect populations is a key factor to quantify the available resources and energy fluxes in ecosystems food webs. Cornops aquaticum is a common herbivore in Eichhornia plants in wetlands of Northeast Argentina. We aimed to analyse its biomass variation, related to the different grasshopper age catego ries populations in two hostplants: Eichhornia azurea and Eichhornia crassipes. For this, standard samplings of C. aquaticum populations were carried out with an entomological net of 70cm diameter in two wetlands with E. azurea and E. crassipes, in Corrientes and Chaco Provinces; besides, dry weight was also obtained (directly and indirectly), and a regression model to indirectly estimate the biomass from a linear dimension measure (hind femur length) is proposed. A total of 2 307 individuals were collected and separated in different age categories; their abundance and linear dimension data were obtained. The model proposed was lnDM=ln a + b *lnH (where DM=dry mass, a and b are constants and H=hind femur length) (R 2 =0.97). The population biomass variations of C. aquaticum were due to the relative abundance of each age category and the grasshopper individual dry weight. No significant differences were found between populations biomasses obtained by direct and indirect methods in E. azurea and E. crassipes floating meadows. This model made easier the C. aquaticum biomass calculation for both individuals and the population, and accelerated the processing of high number of samples. Finally, high biomass values of populations and individual age category (especially in adults) emphasize the importance of C. aquaticum as a consumer and a resource for predators on Eichhornia floating meadows food webs. Rev. Biol. Trop. 63 (1): 127138. Epub 2015 March 01. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44933764010 es http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.63