Variação temporal na abundância de espécies de aves aquáticas em uma lagoa costeira do Norte Fluminense do estado do Rio de Janeiro, sudeste do Brasil

Abstract

ResumoEste estudo avaliou a inluência de diferentes regimes de precipitação em lutuações numéricas de aves aquáticas na Lagoa da Ribeira, Quissamã, norte luminense, Brasil. Contagens de aves foram conduzidas mensalmente entre agosto de 2008 e julho de 2009, totalizando 12 visitas. Dados de precipitação pluviométrica foram obtidos na estação meteorológica automática mais próxima. Um total de 50 espécies foi classiicado em seis grupos funcionais. A riqueza e abundância de aves foram maiores durante o período seco (maio/agosto). O coeiciente linear de Spearman entre a abundância de aves e a precipitação mensal foi -0,77 (P = 0,003). Da mesma forma, houve correlação negativa signiicativa entre valores de precipitação e a abundância de grupos de aves vasculhadoras, mergulhadoras e catadoras. O modelo de predição exponencial foi o mais adequado aos dados (R² = 0,53), com coeiciente de correlação entre valores de abundância previstos e os observados, igual a 0,76 (P = 0,006). O modelo obtido prediz considerável declínio no número total de aves em meses com precipitação superior a 100 mm na Lagoa da Ribeira. Palavras-chave: Abundância de aves; Lagoa da Ribeira; Precipitação pluviométrica AbstractTemporal variation in the abundance of waterbird species in a coastal lagoon in the northern Rio de Janeiro, southeastern Brazil. This study evaluated the inluence of different rainfall regimes on numerical luctuations of waterbird species in Ribeira Lagoon, Quissamã, northern Rio de Janeiro state, Brazil. Bird counts were conducted on a monthly basis between August 2008 and July 2009, totaling 12 visits. Rainfall data were obtained at the nearest meteorological automatic station. A total of 50 species were classiied into 6 functional groups. Bird richness and abundance were greater during the dry season (May/August). Spearman's coeficient between bird abundance and monthly rainfall was -0.77 (P = 0.003). Similarly, there was a signiicant negative correlation between rainfall values and the abundance of dabbling, diving, and gleaning bird groups. The exponential prediction model was the most appropriate to the dataset (R² = 0.53), with a correlation coeficient between predicted and observed abundance values of 0.76 (P = 0.006). The model obtained predicts a signiicant decline in the total number of birds in months with rainfall over 100 mm in Ribeira Lagoon.

Water-level controlled reservoir as refugia for waterbirds in an urban landscape

“…The homogeneity in waterbird richness among seasons was similar to previous studies, such as Pereira (1998), Scherer et al (2011), and Rubim (2013) in nearby lagoons. However, Tavares and Siciliano (2014) observed higher richness in the dry season, and Donatelli et al (2014) in the rainy season. In this study, the high number of resident species and the absence of migratory shorebirds contributed to the relatively constant species richness over the sampling months.…”

“…Richness species tends to increase in the rainy season due to the arrival of Nearctic and Austral migrants (Joseph 1997); however, migratory behavior and distributional patterns of species may differ locally, and then richness could be constant over the year (Rubim 2013). Bird abundance may increase in the dry season when lower water levels favor feeding (Tavares and Siciliano 2014), but no increase can be found in some wetlands (Scherer et al 2011).…”

Richness, abundance and microhabitat use by Ardeidae (Aves: Pelecaniformes) during one seasonal cycle in the floodplain lakesof the lower Amazon River

“…Among the six species that varied in abundance between the four phases of the seasonal cycle, five were more abundant during the dry season, with waters at lowest level. In this phase, there is frequently an increase in the abundance of waterbirds in lakes located in areas that get periodically flooded (e.g., Guadagnin et al 2005, Accordi and Hartz 2006, Soares and Ro drigues 2009, Gimenes and Anjos 2011, Cintra 2012, Tavares and Siciliano 2014. The most common justification for this pattern is that food resources become very concentrated in these lakes during the dry period, which the waterbirds come to exploit Anjos 2006, Cintra et al 2007).…”

Peer Review #2 of "The effect of mangrove restoration on avian assemblages of a coastal lagoon in southern Mexico (v0.1)"

“…Additionally, the selection of open and semi-open areas likely reduces the predation risk and increases the foraging efficiency of wading species (Pomeroy, 2006;Chacin et al, 2015). Notwithstanding, while tall and broad canopy vegetation might negatively affect the foraging efficiency of water birds, it might become more beneficial for the insectivores (Tavares & Siciliano, 2013). Thus, the presence of wading and diving, together with canopy and undergrowth species using the edges of primary habitat and the emerging vegetation within the restored site, may have influenced the proportions of bird abundance and richness in the study area.…”