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16 results for “waterbird diversity”
Fig. 2, A in An Overview Of The Ecological Values Of Soumar Wetland On Waterbirds Diversity
Fig. 2, A — monthly trend of abundance and richness of waterbirds in the Soumar wetland (Setif, Algeria). Abundance = number of individuals and Taxa_S = number of species. B — cumulative effect between abundance and richness using the Gini measure of evenness (G').
Fig. 4 in An Overview Of The Ecological Values Of Soumar Wetland On Waterbirds Diversity
Fig. 4. Diversity profile of waterbirds alpha diversity for each month in the Soumar wetland (Setif, Algeria). α = 0 richness; α = 1 Shannon–Weaver index; α = 2 inverse Simpson index (1/D); and α = a high value approximates the Berger–Parker index.
Fig. 2 in Neglected parasite reservoirs in wetlands: Prevalence and diversity of avian haemosporidians in waterbird communities in Northeast China
Fig. 2. Diversity (a) and frequency (b) of haemosporidian parasite lineages obtained from waterbirds in Tumuji, China. Sankey diagrams of the correlation between waterbirds (left, sorted by order) and identified haemosporidian lineages (right). The width of the lines indicates proportion to the infection recordings in waterbirds, and the colour of the lines indicates the range of the lineage size. The numbers represent infection cases. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 3 in Neglected parasite reservoirs in wetlands: Prevalence and diversity of avian haemosporidians in waterbird communities in Northeast China
Fig. 3. Bayesian phylogenetic reconstruction of 479 bp haemosporidian cyt b lineages from waterbirds in Tumuji, China, with Hepatocystis sp. as an outgroup, and several morpho-species were included for a higher resolution of phylogenetic patterns. Posterior probabilities higher than 0.90 are shown by the node. Lineages that were previously recorded and detected in this study are marked in bold. Major monophyletic clades with high support are labelled behind the line (Leucocytozoon: L1-L5; Haemoproteus: H1–H3).
Fig. 1 in Neglected parasite reservoirs in wetlands: Prevalence and diversity of avian haemosporidians in waterbird communities in Northeast China
Fig. 1. Heatmap of the apparent prevalence of waterbird species in the Tumuji National Nature Reserve. Presenting infected waterbird species (left, sorted by order) with prevalence (indicated by colour gradient, scale from 0 to 1). The sample size is shown in parentheses.
Fig. 1 in An Overview Of The Ecological Values Of Soumar Wetland On Waterbirds Diversity
Fig. 1. Geographical location of the Soumar wetland (Setif, Northeast Algeria).
Nestedness theory suggests wetland fragments with large areas and macrophyte diversity benefit waterbirds
<p>Many artificial wetland constructions are currently underway worldwide to compensate for the degradation of natural wetland systems. Researchers face the responsibility of proposing wetland management and species protection strategies to ensure that constructed wetlands positively impact waterbird diversity. Nestedness is a commonly occurring pattern for biotas in fragmented habitats with important implications for conservation; however, only a few studies have focused on seasonal waterbird communities in current artificial wetlands. In this study, we used the nestedness theory for analyzing the annual and seasonal community structures of waterbirds in artificial wetlands at Lake Dianchi (China) to suggest artificial wetland management and waterbird conservation strategies. We carried out three waterbird surveys per month for one year to observe the annual, spring, summer, autumn, and winter waterbird assemblages in 27 lakeside artificial wetland fragments. We used the NeD program to quantify nestedness patterns of waterbirds at the annual and seasonal levels. We also determined Spearman partial correlations to examine the associations of nestedness rank and habitat variables to explore the factors underlying nestedness patterns. We found that annual and all four seasonal waterbird compositions were nested, and selective extinction and habitat nestedness were the main factors governing nestedness. Further, selective colonization was the key driver of nestedness in autumn and winter waterbirds. We suggest that the area of wetland fragments should be as large as possible and that habitat heterogeneity should be maximized to fulfill the conservation needs of different seasonal waterbirds. Furthermore, we suggest that future studies should focus on the least area criterion, and that vegetation management of artificial wetland construction should be based on the notion of sustainable development for humans and wildlife. </p>
Data from: Waterbird diversity patterns under varied hydrological regimes in Dongting Lake and surrounding lakes
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Nestedness theory suggests wetland fragments with large areas and macrophyte diversity benefit waterbirds
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Data from: Seasonal dynamics of waterbird assembly mechanisms revealed by phylogenetic and functional diversity in a subtropical wetland
Despite growing interest in phylogenetic and functional methods in ecological assembly, less attention has been paid to seasonal variation patterns of migrant species. Migrants can rapidly mediate influences of species interactions and environmental factors through seasonal movement, suggesting dynamical relative importance of different assembly mechanisms among seasons. Here we describe seasonal dynamics in phylogenetic and functional diversity of waterbirds in Mai Po Wetland, in a subtropical region with significant predictable temporal variation. Phylogenetic and functional structure of α diversity varied seasonally. Specifically, phylogenetic structures clustered in summer, while being over-dispersed in winter. However, phylogenetic structure in spring and autumn was intermediate with a transition to random. Functional structure was clustered in spring but showed over-dispersion in the other three seasons. For β diversity, summer and winter assemblages had two distinct groups, while spring and autumn assemblages were mixed. Thus, waterbird assemblages were primarily shaped by interspecific competition in winter. Random processes tended to shape assemblage in spring. Environmental factors played a more important role in summer . In addition, phylogenetic distance of probability of co-occurrence of species pairs was significantly larger in winter than in summer. These results suggest that the relative importance of assemblage mechanisms can vary seasonally in response to changing environmental conditions, suggesting that studies attempting to infer a single dominant assembly mechanism may ignore important assembly processes. Temporal shifts in assembly mechanisms may play an important role in maintaining diversity of subtropical and temperate wetlands and perhaps other dynamic systems.
Hierarchy of the factors influencing the broad-scale waterbirds functional diversity gradients in temperate China
<p>Geographical gradients in species diversity have long fascinated biogeographers and ecologists. However, the extent and generality of the positive/negative effects of the important factors governing functional diversity (FD) patterns are still debated, especially for the freshwater domain. We examined lake productivity and functional richness (FRic) of waterbirds sampled from 35 lakes and reservoirs in northern China with a geographic coverage of over 5 million km2. We used structural equation modelling (SEM) to explore the causal relationships between geographic position, climate, lake productivity and waterbirds FRic. We found unambiguous altitudinal and longitudinal gradients in lake productivity and waterbirds FD, which were strongly mediated by local environmental factors. Specifically, we found 1) lake productivity increased northeast but decreased with altitude, and the observed gradients were driven by climate and nutrient availability, with 93% of variation explained in the individual SEM; 2) waterbirds FD showed similar geographic and elevational gradients.; the environmental factors which had direct and/or indirect effects on these geographic and elevational gradients included climate, lake productivity and morphology, which collectively explained more than 56% of the variation in waterbirds FD; and 3) a significant (P = 0.029) causality between lake productivity and waterbirds FD was confirmed. Nevertheless, the causality link was relatively weak in comparison with climate and lake area (standardized path coefficient was 0.65, 0.21, and 0.17 for climate, area, and productivity, respectively). Through articulating the dominant causality paths, our results could contribute to the mechanistic explanations underlying the observed broad–scale biodiversity gradients.</p>
Data from: Seasonal dynamics of waterbird assembly mechanisms revealed by phylogenetic and functional diversity in a subtropical wetland
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Hierarchy of the factors influencing the broad-scale waterbirds functional diversity gradients in temperate China
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Dyke demolition led to a sharp decline in waterbird diversity due to habitat quality reduction: a case study of Dongting Lake, China
Dongting Lake, an important wintering habitat for migratory waterbirds in the East Asian–Australasian Flyway, has suffered serious degradation in recent decades. To restore habitats for biodiversity conservation and flood control, 459 dykes were demolished and 14 were preserved in 2017. However, the direct impact of dyke demolition on wintering waterbirds was not comprehensively assessed. In this study, based on annual waterbird census and habitat data (2013/14–2020/21), we compared the differences in habitat areas and species composition of waterbirds in the dyke-demolished and preserved areas, and explored whether habitat changes caused by the dyke demolition were responsible for the changes in the number of species and percentages of waterbird individuals. The results indicate that the areas of water (including shallow water) and mudflat habitats significantly decreased, but the vegetation area significantly increased in the dyke-demolished areas. The species numbers and percentages of waterbird individuals at the community and foraging guilds levels, and the percentages of nine species, were higher in the dyke-preserved areas than those in the dyke-demolished areas. Changes in the numbers of species and percentages of individuals of fish eaters, insectivores, and omnivores positively correlated with drastic changes in the percentages of water habitats (including shallow water) after dyke demolition. Effective measures should be carried out to restore hydrological regimes, providing waterbirds sufficient suitable habitats with different water depths. These findings improve our understanding of the influence of dyke demolition on waterbirds and provide insights for wetland management and waterbird conservation. --
Dyke demolition led to a sharp decline in waterbird diversity due to habitat quality reduction: a case study of Dongting Lake, China
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Fig. 3 in An Overview Of The Ecological Values Of Soumar Wetland On Waterbirds Diversity
Fig. 3. Monthly trend of waterbird dominance in the Soumar wetland (Setif, Algeria).
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