Are there recent gobal data on forest fragmentation / connectivity?

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Andrew Paul McKenzie Pegman

Yes, there are many meta studies. See:Article Meta-Analysis of the Effects of Forest Fragmentation on Inte...

R. T. Corlett

You need to define both a 'fragment' and 'connectivity'. Brinck et al. 2017 in Nature Communications, using 30-m resolution satellite maps, mapped the whole tropics and counted 7.6 million forest fragments with a mean fragment size of 52 ha in tropical Asia. If you had higher resolution maps there would be more fragments and smaller mean size. A single tree is a fragment for some purposes. Connectivity largely depends on the species of concern: some understorey birds won't cross a 30-m gap while flying foxes will cross 40-km of sea, possibly with small seeds in their guts. It also depends on what the matrix is, with forest-like crops a lot more permeable than pasture or urban areas.

Franck Trolliet

Thank you all for your inputs. I am looking for global data on fragmentation so to be able to compare levels of fragmentation across regions. Studies focusing on tropical forests and on effects of fragmentation are therefore not of much interest.

Hai-Dong Li

Dear Prof. Corlett,

You mentioned "understorey birds won't cross a 30-m gap " above. Do you have any papers to recommend for me?

Best wishes,

Hai-Dong

David Tan

Hai-Dong Li , I'm not sure if this is entirely relevant, but our recent study on the Striped Tit-Babbler shows that individuals from this species rarely disperse beyond 1km and remain largely sedentary following natal dispersal. We also cited a study showing the limited dispersal distances of the Abbott's Wren-Babbler (~200-700m based on radio telemetry data)

Article Novel genome and genome-wide SNPs reveal early fragmentation...

Basuki Wasis

Each country has statistical data regarding periodic forest cover. I think it can answer the problem of climate change due to reduced forest cover on earth

Hai-Dong Li. Susan Laurance in a classic study in the Amazon showed that some birds would not cross a 30-40 m wide road clearing. 'Effects of Road Clearings on Movement Patterns of Understory Rainforest Birds in Central Amazonia', Conservation Biology, 2004.