Patrones de variación espacial y temporal de los macroinvertebrados acuáticos en la Laguna de Tecocomulco, Hidalgo (México)

Abstract

Spatial and temporal variation patterns in aquatic macroinvertebrates of Tecocomulco Lake, Hidalgo (México). Lake Tecocomulco, Hidalgo, is a relic of the ancient lakes of Anahuac, important for the conservation of resident and migratory birds. However, the composition of aquatic macroinvertebrates is unknown; this is an important gap in conservation as they play an important role in the food web. This study analyzed the spatial and temporal variations in macroinvertebrate assemblages and their relationship with habitat characteristics. We carried out four monitoring campaigns covering the rainy and dry seasons. The monitoring was conducted at six study sites (four in the littoral zone and two in the middle part of the lake), environmental factors were recorded at each study site, water samples were collected for their physical and chemical analysis and aquatic macroinvertebrates were collected. A principal component analysis (PCA) was used to group study sites based on physical and chemical characteristics. Richness of taxa was analysed with rarefaction. We assessed the importance value index of each taxon (considering their frequency of occurrence and abundance). Similarity analyzes were performed between study sites and similarity of taxa with indices of Jaccard and Bray-Curtis, respectively. We performed a canonical correspondence analysis (CCA) between environmental factors and macroinvertebrate taxa. The PCA showed a marked seasonal variation represented by warm periods, with high values of conductivity, alkalinity, hardness, sulfates, and macronutrients (N and P) and the cold period with low values. We found a total of 26 taxa of aquatic macroinvertebrates and the highest richness was found in August. The Jaccard similarity analysis found differences between the littoral area and the limnetic zone, which differ also in the composition of macrophytes. The littoral zone had the highest taxa richness of macroinvertebrates and macrophytes, while the lowest diversity was found in the offshore zone. The CCA related physicochemical characteristics of the water body with macroinvertebrate taxa showing the influence of both physicochemical characteristics and the composition of macrophytes in the spatio-temporal patterns of aquatic macroinvertebrates in the lake. The dominance of Corixidae highlights a strong grazing activity in the lake and in turn suggests an important amount of food available for higher trophic levels. Our study shows that the macroinvertebrates of Tecocomulco Lake have spatial and seasonal variations that are related to both environmental and biotic factors with groups being dominant. Rev. Biol. Trop. 62 (Suppl. 2): 81-96. Epub 2014 April 01.

First detection of spring viraemia of carp virus in common carp (Cyprinus carpio L.) affected by a septicaemic disease in Mexico

“…Taking into account existing Mexican regulations, the results of this study do not demonstrate whether the isolated virus meets Koch's postulates. Except for studies on parasitic helminths (Monks et al, ), to date no health studies exist for aquatic organisms in the Tecocomulco Lagoon, despite the existence of records on water‐quality parameters (Aguilar‐Martínez, ; Delgadillo, ), algae (Novelo et al, ; Quiroz‐Flores, Ramírez‐García, & Lot‐Helgueras, ), macroinvertebrate populations (Rico‐Sánchez et al, ) and pesticide presence/levels (Aguilar‐Martínez, ). Therefore, the impact of the isolated SVCV pathogen on fish populations in the Tecocomulco Lagoon remains unclear, and information regarding mortalities associated with this or prior cases is unavailable.…”

“…Therefore, the impact of the isolated SVCV pathogen on fish populations in the Tecocomulco Lagoon remains unclear, and information regarding mortalities associated with this or prior cases is unavailable. This information gap could be due to the large size of the lagoon (1,769 ha; Rico‐Sánchez et al, ) or, perhaps, due to the asymptomatic nature of affected fish, which act as SVCV carriers (Ahne et al, ). Furthermore, the lack of an active health‐monitoring programme in Mexico (Ortega, ) and scarce knowledge of aquatic environments have conditioned local residents and fishermen to view low mortality rates as “normal,” without concerns for identifying the cause.…”

“…All 10 specimens were collected from Tecocomulco, a natural freshwater lagoon in the state of Hidalgo that is approximately 1,769 hectares in size and without tributaries or effluents (Rico‐Sánchez, Rodríguez‐Romero, López‐López, & Sedeño‐Díaz, ). The lagoon is formed by run‐off and springs from the surrounding mountains, has an average length of 10.5 km, is between 1.0 and 3.5 km wide and has a depth, depending on periods of drought, between 70 cm and 2 m (Novelo, Montejano, Cantoral, & Tavera, ).…”

Variación espacial de la comunidad de macroinvertebrados acuáticos en la zona litoral del humedal costero Santa Rosa, Lima, Perú

“…Los sistemas lénticos permanentes, entre ellos los humedales, suelen albergar a los órdenes Coleoptera, Diptera, Hemiptera y Odonata (Trama, Rizo-Patrón, & Springer, 2009;Batzer & Ruhí, 2013; Rico-Sánchez, Rodríguez-Romero, López-López, & Sedeño-Díaz, 2014). En los estudios realizados en humedales costeros peruanos, este patrón en el ensamblaje también es persistente (Peralta & Huamantinco, 2014).…”

“…En muchos estudios de macroinvertebrados acuáticos en ambientes lénticos, se ha manifestado que la hidrología, la vegetación acuática, las perturbaciones antropogénicas y la depredación son los factores que controlan la dinámica de los invertebrados en estos ambientes (Wissinger, 1999;Hall et al, 2004;Batzer & Ruhí, 2013;Kang & King, 2013;Rico-Sánchez et al, 2014). Sin embargo, todavía no se conoce con exactitud cómo estos factores influyen en la comunidad.…”