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Disturbance or loss or both – and how to deal with this?

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Presentation on theme: "Disturbance or loss or both – and how to deal with this?"— Presentation transcript:

1 Disturbance or loss or both – and how to deal with this?
Some thoughts on a controversely discussed issue in Germany – and in context with doc. GES_

2 no recovery = irreversibel = lost forever
Human activity Impact on seafloor long-lasting, Com. Dec. 2017/848: if lasting >12 years = Permanent = Loss (of habitat) short-term, Com. Dec. 2017/848: recovery <12 years = Disturbance understood as no recovery = irreversibel = lost forever But is really so? Either disturbance or loss? And forever?

3 Can a human activity lead to both disturbance and loss?
Yes, it can! As side effect to a long-lasting/permanent effect, e.g. a sediment plume during construction at sea (e.g. cable, bridge, platform) – installation remains >12 years in place, but plume effects are short-term only b) But what about impacts allowing full recovery of benthic communities, but which will take e.g years? →Loss of habitat and associated community at site is only or temporary, though >12 years. Loss or disturb.?

4 to get the full picture (and correct assignment to loss/dist.)?
Do we need to consider the reversibility of effects to get the full picture (and correct assignment to loss/dist.)? Impact on seafloor short-term, reversible Com. Dec. 2017/848: recovery <12 years = Disturbance long-lasting, if lasting >12 years and irreversible = Permanent = Loss long-lasting, >12 years, but reversible = semi-permanent = temporary and/or partial loss Guidance for „grey zones“ needed. Help from TG Seafloor and ICES D6-workshops?


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