DOI: 10.1016/j.foreco.2016.11.013
Scopus记录号: 2-s2.0-85007329008
论文题名: What drives current population trends in forest birds – forest quantity, quality or climate? A large-scale analysis from northern Europe
作者: Ram D. ; Axelsson A.-L. ; Green M. ; Smith H.G. ; Lindström Å.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 385 起始页码: 177
结束页码: 188
语种: 英语
英文关键词: Biodiversity
; Forest quality
; Forestry
; Multi-species indicators
; Population trends
; Species richness
Scopus关键词: Biodiversity
; Birds
; Climate change
; Digital storage
; Population statistics
; Statistics
; Timber
; Forest certification schemes
; Large-scale analysis
; Long term monitoring
; Multi species
; Population trends
; Relative contribution
; Representative values
; Species richness
; Forestry
; biodiversity
; bird
; climate change
; dead wood
; demographic survey
; forest inventory
; forestry practice
; population dynamics
; population size
; quantitative analysis
; species richness
; trend analysis
; Sweden
; Aves
英文摘要: Changes in forestry practices and on-going climate change may both have large impacts on forest bird populations. However, large-scale analyses of the effects of temporal changes in forest structure on forest bird numbers are largely lacking. We compared temporal trends from two Swedish nationwide long-term monitoring schemes, the Swedish Bird Survey (1998–2015) and the Swedish National Forestry Inventory (1983–2014), giving representative values for both forest and bird changes over an area of 35 million ha. Since 1998 the total area of middle-aged and mature forest increased by 6.4%. In parallel, several forest structures potentially beneficial to birds (dead wood, retention trees on clear cuts, multi-layer forests, old forest and broadleaved forest) increased somewhat in abundance, most likely as a result of legislation changes and increasing areas under forest certification schemes. Summer temperatures also increased, with warm summers dominating since 2002. In 1998–2015, the population sizes of 58 forest bird species on average increased, as did the number of species observed per route, with no general difference between forest specialists (16 species) and generalists (42 species). However, from around 2005, the positive trends in bird numbers and many forest structures have levelled out. An analysis of species population trends in relation to a measure of climate sensitivity (Species Temperature Index, STI) suggested that forest birds, just like Swedish birds in general, have indeed been affected by a warming climate. But given their STI, forest birds on average had more positive trends than non-forest birds, suggesting that other factors than climate have affected them positively. Strong candidate factors are the documented changes in forest quality and quantity. Whereas our data and analyses are correlational, and no firm conclusions on causality therefore can be drawn, it is reasonable to assume that the recent increases in forest quantity, forest quality, and summer temperatures, all have contributed to the general increase in forest bird numbers in Sweden. But the relative contribution of these driving forces remains to be determined. When it comes to the potentially positive effects of improving forest quality in terms of increases in old forest, stratification, retention trees and dead wood, it is noteworthy that many of the positive trends in forest structures since the mid-1990s seem to have ceased recently. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64540
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, Biodiversity Unit, Lund University, Ecology Building, Lund, Sweden; Department of Forest Resource Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden; Centre for Environmental and Climate Research, Lund University, Lund, Sweden
Recommended Citation:
Ram D.,Axelsson A.-L.,Green M.,et al. What drives current population trends in forest birds – forest quantity, quality or climate? A large-scale analysis from northern Europe[J]. Forest Ecology and Management,2017-01-01,385