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Historic changes in species composition for a globally unique bird community
Swen C Renner1,2, Paul J J Bates3,4
1Ornithology, Natural History Museum Vienna, Burgring 7, 1010, Vienna, Austria. swen.renner@nhm-wien.ac.at.
Scientific Reports
|July 3, 2020
Summary
Global change impacts bird communities, causing significant shifts in species composition and abundance over time. Long-term ecological data reveals substantial turnover, highlighting the need for consistent monitoring in diverse ecosystems.
Area of Science:
- Ecology
- Biodiversity Science
- Environmental Change
Background:
- Understanding long-term ecological changes is crucial for conservation.
- Short time series and methodological issues hinder analysis of species diversity.
- Global change impacts on species richness, abundance, and composition remain uncertain.
Purpose of the Study:
- To investigate temporal changes in bird diversity in Myanmar's Hkakabo Razi Landscape.
- To compare bird communities across two distinct time periods (pre-1940 and post-2000).
- To assess the role of land-cover changes as drivers of observed biodiversity shifts.
Main Methods:
- Comparative analysis of historical (1900-1939) and recent (2001-2006) bird survey data.
- Inclusion of land-cover data to model potential environmental drivers.
- Statistical analysis of species richness, relative abundance, and species composition.
Main Results:
- Species richness remained stable, but species composition and relative abundance showed significant temporal changes.
- A high species turnover rate was observed, with only 19.2% of species present in both periods.
- Land-cover models partially explained species richness variability but not changes in abundance or composition.
Conclusions:
- Temporal changes in bird communities are evident in the Hkakabo Razi Landscape.
- Methodological differences and land-cover changes likely contribute to observed biodiversity shifts.
- Long-term, standardized monitoring is essential for accurate ecological assessments.
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