Hanski_Biodiversity and habitat fragmentation_生物多样性与生境破碎化
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Biodiversity and habitat fragmentation
or what I have been doing for 50 yrs
Biodiversity
A bit of personal history
Fragmentation
Passion in the 1980s
Fragmentation and biodiversity
Current work
Image Jyrki Siukonen
Dusky meadow brown (Hyponephele lycaon) 18 August, 1964 (I. Hanski leg.)
Dusky meadow brown (Hyponephele lycaon) 18 August, 1964 (I. Hanski leg.)
Dusky meadow brown (Hyponephele lycaon) 18 August, 1964 (I. Hanski leg.)
The sudden final disappearance of the species in Finland is presumably the outcome of the small size and isolation of these populations, which leads to the formation of homozygous and consequently uniform strains. The result is loss of capacity for adaptation with the possibility of rapid destruction if conditions change. Additional support for this hypothesis is afforded by the fact that the Finnish Epinephele lycaon specimens vary very little morphologically, whereas outside the frontiers of Finland, as close as the Leningrad region even, the variability of the species is considerable.
Biodiversity
A bit of personal history
Fragmentation
Passion in the 1980s Fragmentation and biodiversity
C urrent work
Egg‐laying for 3 days on individual carcasses
Rearing of larvae by keeping the carcasses either singly or in groups
of 2 or4 in the rearing pots
The observed number of species in the pooled
rearings
The expected number of species in the pooled
rearings
In the 1980s and 1990s:
B. Shorrocks, I. Hanski, G. De Jong, A. Ives, J. Jaenike, R. Green, M. Hassell, R. May, R. Anderson and many others
Image Jyrki Siukonen
Biodiversity
A bit of personal history
Fragmentation
Passion in the 1980s Fragmentation and biodiversity Current work with Joel Rybicki
z
cA S =z
new new A A S S )/(/=.
The power-law SAR
SAR has been used to predict the numbers of species going extinct when habitat is lost
SAR predictions about extinctions at the landscape level are suspect because the model assumes contiguous
habitat
A model of how habitat loss and fragmentation
influence biodiversity
•Heterogeneous landscape, spatially correlated variation in habitat type •Hundreds of species, variation in species niches
•Explicit modelling of spatial dynamics
Rybicki& Hanski 2013 Ecol Letters
Rybicki & Hanski 2013 Ecol Letters
The species-fragmented area relationship
M
b z e cA S λ/-=1
log log log --+=M
b A z
c S λ