Seasonal changes in the water bird community in Lake Inba: Influence of floating-leaved macrophytes on habitat selection

2015 ◽  
Vol 126 ◽  
pp. 32-37 ◽  
Author(s):  
Masayuki Kawatsu ◽  
Gen Morimoto ◽  
Maiko Kagami
Keyword(s):  
Habitat Selection ◽  
Seasonal Changes ◽  
Bird Community ◽  
Water Bird

scholarly journals Seasonality of forest invertebrates in Hong Kong, South China

2002 ◽  
Vol 18 (4) ◽  
pp. 637-644 ◽  
Author(s):  
Kwok Hon Kai ◽  
Richard T. Corlett
Keyword(s):  
Hong Kong ◽  
Seasonal Changes ◽  
Bird Community ◽  
Absolute Minimum ◽  
Northern Margin ◽  
Plant Names ◽  
Bird Fauna ◽  
Summer Temperatures ◽  
Formed Part ◽  
The Tropics

Because of its position on the northern margin of the tropics (22° 17′N) and the southern coast of a huge continent, Hong Kong has a climate in which both temperature and rainfall are highly seasonal. Although summer temperatures are equatorial, the January mean is only 15.8 °C,and the absolute minimum recorded at sea level is 0 °C (Dudgeon & Corlett 1994). As a result, all aspects of the ecology of Hong Kong show seasonal changes. The most dramatic changes occur in the bird fauna, with the majority of species migratory (Carey et al. 2001). The winter fruiting peak in secondary shrublands and the forest understorey coincides with the arrival of partially frugivorous migrant robins and thrushes (Corlett 1993). However, while resident insectivore-frugivores consume almost entirely fruit during this period (Corlett 1998), all the winter visitors continue to eat insects and some (e.g. Phylloscopus warblers) are entirely insectivorous. The study of insect seasonality reported here formed part of a 30-mo study of the seasonality of a forest bird community in Hong Kong (Kwok & Corlett 1999, 2000). Plant names follow Corlett et al. (2000).

scholarly journals Water Birds as Indicators of Ecological Conditions in a Ramsar Wetland (Sebkhet Bazer, East of Algeria)

2021 ◽  
Author(s):  
Sabrina Djerboua ◽  
Sofia Djerdali ◽  
José Guerrero-Casado ◽  
Abdelkrim Si Bachir ◽  
Ali Guendouz
Keyword(s):  
Water Body ◽  
Linear Models ◽  
Abiotic Factors ◽  
Bird Community ◽  
Ecological Indicator ◽  
Bird Abundance ◽  
Seasonal Differences ◽  
Water Bird ◽  
Physico Chemical ◽  
Water Birds

Background: Wetlands are the highly complex ecosystems due to various interactions between the components, where, the most iconic of ecological changes are the water birds. The current study was aimed to examine the interactions between the water birds diversity, abundance and the abiotic factors in Sebkhet Bazer. Methods: The investigation was conducted between March 2013 and December 2014 in Sebkhet Bazer (Sétif, Algeria, 36°05'N and 5°45'E), by monitoring water birds abundance (grouped into 4: Anatidae, Rallidae, Phoenicopteridae and Shorebirds) and measuring the physico-chemical water parameters (depth, temperature, pH, salinity and vegetation cover). All statistical analysis was performed using the InfoStat software (2017), it was carried out in two steps, by testing of fixed linear models; first of the seasonal differences in water body variables and second of the seasonal differences in bird abundance for the 4 water bird groups. Result: The results showed that the physico-chemical parameters of water varied considerably from season to season. The four groups of birds reached their lowest abundance in summer, with Rallidae and Phonicopteridae being more abundant in spring, Anatidae in winter and Shorebirds in autumn, suggesting that this variation is attributed to changes in water body characteristics between the four seasons. Therefore, the abundance of the different water bird group could be used as an ecological indicator of this wetland’s characteristics. If these features are altered by climate change, the water bird community would be also affected.

Composition and seasonal changes of the bird community in the west pampa grasslands of Argentina

2003 ◽  
Vol 74 (1) ◽  
pp. 59-65 ◽  
Author(s):  
J. P. Isacch ◽  
M. S. Bo ◽  
N. O. Maceira ◽  
M. R. Demaría ◽  
S. Peluc
Keyword(s):  
Seasonal Changes ◽  
Bird Community ◽  
The West

Diet and habitat selection of wood bison in relation to seasonal changes in forage quantity and quality

1991 ◽  
Vol 69 (10) ◽  
pp. 2677-2685 ◽  
Author(s):  
Nicholas C. Larter ◽  
Cormack C. Gates
Keyword(s):  
Habitat Selection ◽  
Seasonal Changes ◽  
Crude Protein ◽  
Bison Bison ◽  
Winter Habitat ◽  
Forage Availability ◽  
Winter Diet ◽  
Wood Bison ◽  
Snow Conditions ◽  
Selection Of

Diet and habitat selection of wood bison (Bison bison athabascae) were studied in the Mackenzie Bison Sanctuary, Northwest Territories, between February 1986 and April 1988. Wood bison showed pronounced seasonal changes in diet. Sedges constituted 96.1–98.8% of the winter diet. During summer, the diet became a more diverse mix of sedge (Carex spp.), grass (Graminae), and willow (Salix spp.). Lichen (Cladina mitis) became a major dietary component in fall. Summer browsing on willows increased when sedge standing crops were reduced. Forage availability was the main factor determining habitat selection. Wet sedge meadows provided the most available crude protein in winter and were the preferred winter habitat. Willow savannas provided the most available crude protein in summer and were the preferred summer habitat. Between June and October, all forages except lichen decreased in nitrogen content and increased in fibre content. The lack of distinct habitat preference in fall corresponded to dispersion of animals into forested habitats, increased use of lichen as forage, and more homogeneous availability of crude protein among habitats. Snow conditions were harsher in 1987–1988 than in 1986–1987, which affected forage availability and caused a noticeable shift in habitat use.

scholarly journals Evidence for seasonal changes in population structure of Reed Buntings (Emberiza schoeniclus) in the Lake Neusiedl Region: a stable-isotope approach

2021 ◽  
Author(s):  
Barbara Kofler ◽  
Wolfgang Wanek ◽  
Christian C. Voigt ◽  
Christian H. Schulze
Keyword(s):  
Population Structure ◽  
Stable Isotope ◽  
Habitat Selection ◽  
Seasonal Changes ◽  
Food Sources ◽  
First Year ◽  
Wintering Grounds ◽  
Emberiza Schoeniclus ◽  
Different Populations ◽  
Reed Bunting

AbstractMigrating species and populations are affected by conditions existing across large geographical scales. The degree to which populations mix at stop-over sites and wintering grounds is variable and can involve important fitness consequences. Thus, the link between breeding and wintering grounds and seasonal shifts in population structure are important to understand population demographics, local adaption and diversification patterns. This work aims to infer migration patterns and population connectivity in the Reed Bunting (Emberiza schoeniclus) community of a Ramsar-designated wetland, Lake Neusiedl, Seewinkel, Austria. Stable isotope markers (hydrogen, δ2H, carbon, δ13C) in feathers were analyzed to assign individuals to a specific breeding or natal area. Based on the geographic assignment, birds were compared with respect to their ecomorphological traits and their habitat selection (large reed bed versus more open habitat at shore of an alkaline lake) during winter to assess potential ecological differences and possibly associated morphological divergence. Stable isotope data revealed that the local Reed Bunting community undergoes seasonal changes in population structure. Three different populations that vary in their δ2H signature and to some extent in morphological characteristics as well as in δ13C values were identified. Indications for differential migration related to age and/or sex were additionally found, since males and females as well as first-year birds and adults showed remarkable differences in their traits and feather isotope values. δ2H values diverged significantly between these groups in both age and sex classes and birds with highest feather δ2H values were considered to represent the local breeding population at Lake Neusiedl and possibly also Reed Buntings from close surroundings. Moreover, this group had the highest δ13C values in first-year individuals as well as in adults. In both sex classes, the assignment of Reed Buntings to different populations was ultimately possible due to differences in bill shape with residents being characterized by more massive bills than individuals belonging to populations visiting the study area only during migration or for wintering. During winter, beak shape and feather δ2H and δ13C values differed significantly between birds caught in the reed stand of Lake Neusiedl and those captured near the salt pan, hence, indicating differential habitat selection among co-occurring populations during winter. These findings suggest that morphological attributes, such as bill shape and size as well as linked adaptations to different food sources play a decisive role for niche segregation among wintering populations. The results provide evidence that different populations mix during migration and during winter at Lake Neusiedl and the extent to which they are specialized to a specific habitat varied.

Sign in / Sign up

Export Citation Format

Share Document