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Redalyc.Diversity of Amphibians in Rice Fields from Northeastern Argentina Interciencia ISSN: 0378-1844 [email protected] Asociación Interciencia Venezuela Duré, Marta I.; Kehr, Arturo I.; Schaefer, Eduardo F.; Marangoni, Federico Diversity of amphibians in rice fields from northeastern argentina Interciencia, vol. 33, núm. 7, julio, 2008, pp. 523-527 Asociación Interciencia Caracas, Venezuela Available in: http://www.redalyc.org/articulo.oa?id=33933709 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative DIVersiTY of amPHibiaNS IN riCE fieLds from NorTHeasTerN ARGENTINA Marta I. Duré, Arturo I. Kehr, Eduardo F. Schaefer and Federico Marangoni SUMMARY The anuran biodiversity and richness of a frog community in- etation was the most diverse of the microhabitats, while gullies habiting rice fields in northeastern Argentina was surveyed and were the poorest in species. The amphibian species of three of analyzed. The samples were taken between October 2001 and the microhabitats adjusted to the logarithmic range-abundance June 2003. Twenty six species of amphibians were identified in model, one to the geometric and one to the broken stick model. five microhabitats: rice fields per se, ditches and paths, natu- The data suggest that rice cropping in northeastern Argentina, if ral vegetation, aquatic vegetation and gullies. The natural veg- properly managed, can support a diverse anuran fauna. DIVERSIDAD DE ANFIBIOS EN CAMPOS DE ARROZ EN EL NORESTE DE ARGENTINA Marta I. Duré, Arturo I. Kehr, Eduardo F. Schaefer y Federico Marangon RESUMEN Se registró y analizó la diversidad y riqueza de una comuni- que las barrancas presentaron la menor cantidad de especies. El dad de anfibios que habita campos de arroz en el nordeste de modelo de rango abundancia serie logarítmica fue el de mejor Argentina. Las muestras fueron obtenidas en el período compren- ajuste para tres de los microhábitats analizados, otro se ajustó dido entre octubre 2001 y junio 2003. Se identificaron 26 espe- al modelo geométrico y el restante al modelo de varilla rota. Los cies habitando cinco microhábitats: campos de arroz, zanjas y datos sugieren que los cultivos de arroz del nordeste argentino, caminos, vegetación natural, vegetación acuática y barrancas. podrían albergar una fauna muy diversa si están sujetos a un La vegetación natural fue el microhábitat más diverso mientras manejo apropiado. diVersidadE de ANFÍbios EM CamPos de arroz NO NordesTE da arGENTINA Marta I. Duré, Arturo I. Kehr, Eduardo F. Schaefer e Federico Marangoni. RESUMO Registrou-se e analisou-se a diversidade e riqueza de uma co- quanto que as barrancas apresentaram a menor quantidade de munidade de anfíbios que habita campos de arroz no nordeste espécies. O modelo de espécie-abundância de série logarítmica da Argentina. As amostras foram obtidas no período compreen- foi o de melhor ajuste para três dos microhábitats analisados, dido entre outubro de 2001 e junho de 2003. Identificaram-se outro foi ajustou ao modelo geométrico e o último ao modelo 26 espécies habitando cinco microhábitats: campos de arroz, de vara quebrada. Os dados sugerem que os cultivos de arroz sulcos e caminhos, vegetação natural, vegetação aquática e bar- do nordeste argentino poderiam abrigar uma fauna muito diver- rancas. A vegetação natural foi o microhábitat mais diverso en- sa se estão sujeitos a uma manipulação apropriada. Introduction 1997 to 1998 to ~86000ha and animal species (Bam- edges that delimit the plots. (Begenesic, 1998). baradeniya and Amerasinghe, The present study analyzes Rice cultivation in Ar- Rice fields also have a fun- 2003; Bambaradeniya et al., amphibian diversity and rich- gentina provides fundamen- damental role in the regula- 2004; Doody et al., 2004). ness in agricultural ecosys- tal contributions to the re- tion of local water and climate A field systematically set tems, particularly in rice fields. gional economies involved. cycles. The ecological features for rice cultivation possesses Amphibians are of interest The Province of Corrientes of the wetlands are a key for main and secondary channels because their special physi- is an important rice producer the preservation of wildlife in for irrigation water supply and ological (skin permeability) whose cultivated surface area these ecosystems, since they outlet, bounds that delimit the and ecological (compound two- increased considerably from harbor highly diverse plant cultivated paddies and interior phase life cycle) characteris- KEYWORDS / Amphibians / Argentina / Biodiversity / Range-Abundance Models / Rice Fields / Received: 12/17/2007. Modified: 06/03/2008. Accepted: 06/05/2008 Marta I. Duré. Doctor in Natu- Argentina. Address: Cecoal. Arturo I. Kehr. Doctor in Natu- gentina. Researcher, CECOAL- ral Sciences, Universidad Na- Ruta Prov. Nº 5, Km 2.5. C.C. ral Sciences, UNLP, Argentina. CONICET, Argentina. cional de La Plata (UNLP), 140. C.P. 3400. Corrientes, Researcher, CECOAL-CONI- Federico Marangoni. Doctor Argentina. Researcher, Cen- Argentina. e-mail: martadure@ CET, Argentina. in Ecology, Universidad de tro de Ecología Aplicada del yahoo.com Eduardo F. Schaefer. Doctor in Sevilla, Spain. Researcher, CE- Litoral (CECOAL-CONICET), Natural Sciences, UNLP, Ar- COAL-CONICET, Argentina. JUL 2008, VOL. 33 Nº 7 0378-1844/08/06/523-05 $ 3.00/0 523 tics happen to be potentially ing of shrubs and small sized Sampling methods The similarity between the excellent bioindicators, which trees; d) aquatic vegetation, specific composition of every in turn makes it very com- small ponds in which floating Sampling began in October microhabitat was estimated us- mon for amphibian populations aquatic plants had flourished, 2001 and was completed in June ing the Sorensen similarity in- to be severely affected when forming a layer that covered 2003, covering two continuous dex, which uses only binary there are serious disturbances the whole surface of the wa- rice cultivation cycles. The sam- information (presence/absence) to their natural habitats (Blaus- ter; and e) gullies, formations pling was initiated immediately and is calculated as tein and Belden, 2003; Carey that could be up to 20m deep, after completion of field prepa- S=2c/(a+b) and Alexander, 2003; Collins between rice plantations and ration work, which coincided and Storfer, 2003). river banks. with spring and sowing of the where a: number of taxa present Given that rice fields have rice, and continued till the fal- in sample A, b: number present heterogeneous ecological con- Agricultural practices low period. The sampling was in sample B, and c: number of ditions, organisms that live carried out fortnightly, during taxa that are present in both in this habitat must be well For four years prior to this day (18:00) and night (23:00), samples. adapted to continuous changes study, agricultural activities on each session spanning 2.5h. A The Sorensen index can be and their survival will depend the site being monitored were total of 41 sampling sessions also quantitative (species and both on their physiological related entirely to rice culti- were carried out during the en- their abundances in common). characteristics and their ability vation. Preliminary sampling tire survey period. This is one modification of the to migrate. Moreover, agro- began in August, followed in The capture method was Bray and Curtis (1957) formula nomic practices carried out in October by flooding of the manual, with nets, using a and frequently named as So- rice cultivation, for example field with water extracted from sampling methodology known rensen index (Magurran, 1988): when ploughing the fields, ap- the Parana River and, also, wa- as “visual encounters surveys” C = 2jN/(N +N ) plying of herbicides, fertilizers ter distribution to the channels (Heyer et al., 1994). Each sam- N a b and fungicides, and frequent by means of pumping stations. pling was carried out by the where Na: total number of in- adjustments of the water level, The crop period lasted ~100 same three people and each dividuals in site A, Nb: total are considered limiting factors days. Immediately after the microhabitat was supervised number of individuals in site B, for amphibians that inhabit crop was harvested, in Febru- for 30-40min in order to avoid and 2Jn: sum of the lowest of these ecosystems (Bambarad- ary and April, the plots were underestimation of the biodi- the two abundances for species eniya, 2000). prepared for a new sowing. versity. Amphibian specimens found in both sites (Magurran, The aim of this study was to During the period between were captured inside the rice 2004). determine amphibian diversity crop harvest and sowing (fal- field, in channels that take the The community composition and species richness in rice low period), the field retained water from the river up to the for each microhabitat was char- fields in the Corrientes Prov- some water in the channels of plantation and connect different acterized by means of the range ince in relation to the different irrigation and drainage, as well sowed areas, and at relictual - abundance models. For every microhabitats formed inside as in small temporary pools in vegetation that remains inside case, it was specified which of this particular environment. rice fields. the area of study. The sub- the more common three series, Generally, in the rice fields stratum on which specimens logarithmic, geometric and “bro- Materials
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