Effect of Water Level Fluctuations on Wading Bird Foraging Habitat Use at an Irrigation Reservoir, Lake Kerkini, Greece

Dimalexis, A.; Pyrovetsi, Myrto

doi:10.2307/1521690

Cited by 34 publications

(12 citation statements)

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“…An alternative approach to the commonly-used regression models is the use of a log linear analysis. Log linear models are most useful in the context of determining the causal relationships that exist among sets of categorical variables (see, for example, Dimalexis and Pyrovetsi 1997, Lakhan et al 1995, and Floyd and Ranker 1998. The emphasis is on causality and not on generating a predictive model as in regression.…”

Section: Habitat Modelsmentioning

confidence: 99%

Developing habitat models for waterbirds in urban wetlands: a log-linear approach

2007

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Up to 95% of wetlands in southwestern Ontario, Canada, have been drained and converted to other land uses since the mid-1800s. Remaining wetlands now exist within a mosaic of urban and agriculture land cover and may resemble "islands" from the point of view of species that need this habitat. We investigated the relationships between waterbirds and wetland size, isolation, and adjacent forest cover and roads in 19 wetlands within and adjacent to London, Ontario. Waterbirds were grouped into resource-based guilds: Dabblers, Divers, Waders, and Gulls and Terns (because of small samples, the Passerine and Raptor guilds were dropped from the statistical analyses). Because of the high degree of multicollinearity between variables, we used log-linear analysis to develop models that explained variations in species richness in the waterbird guilds. The log-linear technique provided quantification of environmental effects in a richer way than previous research as the interplay between biophysical factors found in reality are partially captured by the inclusion of interaction in the habitat models. All of the models incorporated the biophysical variables of wetland size and adjacent wetland area, forest cover, and roads. Waterbirds in these urban and near-urban landscapes appear to be using all wetlands available to them, no matter how small or how disjunct the wetland. This has implications for wetland evaluations that may not rate wetlands in human-dominated landscapes highly enough to be protected from development.

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Section: Habitat Modelsmentioning

confidence: 99%

Developing habitat models for waterbirds in urban wetlands: a log-linear approach

2007

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“…of isolation from human disturbance, creating a mosaic that changes over time and space [47][48][49]. A mudflat is a habitat where food availability changes considerably with the water level.…”

Section: Effect Of Water Level Fluctuation On Foraging Habitat Usementioning

confidence: 99%

Effect of water level fluctuations on temporal-spatial patterns of foraging activities by the wintering Hooded Crane (Grus monacha)

2015

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Background:The Yangtze River floodplain provides important wintering habitats for Hooded Cranes (Grus monacha) in China. Fluctuations in the water level change foraging habitat and food availability, affecting their temporal-spatial patterns of foraging activities. It is of considerable importance to investigate the effect of these fluctuations on food availability for wintering Hooded Cranes and their foraging response to these changes. Understanding their behavior patterns is beneficial in protecting the wintering crane population and restoring their wintering habitats. Methods:A field survey of the winter behavior of cranes was carried out at Shengjin Lake from November in 2013 to April in 2014. Habitat variables, as well as the spatial distribution and behavior patterns of wintering cranes at their foraging sites during five stages of water level fluctuation were collected. Based on this data we analyzed the relationship of foraging behavior relative to water level fluctuations and habitat types. Results:The foraging habitats used by Hooded Cranes varied at the different water level stages. As the water level decreased, the use of meadows and mudflats increased. When the water dropped to its lowest level, the use by the Hooded Crane in the mudflats reached a peak. There were statistically significant differences in time budget in the three types of habitats over the five stages of the water level. In the mudflats, the foraging behavior and maintenance behavior varied significantly with the water level, while the alert behavior showed little variation. Analysis of a generalized linear model showed that the five water level stages and three habitat types had a significant effect on foraging behavior, while the combined effect of these two variables was significant on the foraging time budget and the length of foraging activity of the Hooded Crane. Conclusions:With the decrease in the water level, the use of mudflats by Hooded Cranes increased correspondingly. Food availability in different habitats was affected by changes in the water level. The Hooded Crane adjusted its foraging patterns and made full use of the three available types of habitat in order to acquire enough food in response to fluctuations in the water level.

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“…Diferentes autores têm constatado flutuações numéricas de aves aquáticas em resposta à variação da profundidade de corpos d'água e sua inluência na disponibilidade de habitat (DIMALEXIS et al, 1997;NTIAMOA-BAIDU et al, 1998;ISOLA et al, 2000). Porém, esse tipo de estudo é escasso no Brasil, onde grande parte das publicações sobre aves aquáticas é focada apenas na descrição de listas de composição.…”

Section: Introductionunclassified

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

Tavares

Siciliano

2013

Biotemas

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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.

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Effect of Water Level Fluctuations on Wading Bird Foraging Habitat Use at an Irrigation Reservoir, Lake Kerkini, Greece

Cited by 34 publications

References 10 publications

Developing habitat models for waterbirds in urban wetlands: a log-linear approach

Developing habitat models for waterbirds in urban wetlands: a log-linear approach

Effect of water level fluctuations on temporal-spatial patterns of foraging activities by the wintering Hooded Crane (Grus monacha)

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

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