[Nhcoll-l] spiders

[Christian Baars]

Hi Fiona,

Many spider species wander far and wide in search of prey, and especially so during the autumn when they look for somewhere to spend the winter. I would be less worried about potential pest populations (you would pick most of them up in your pest monitors) but building defects: the spiders are entering the building through cracks, gaps, broken window panes and gaps underneath exterior doors. These, in turn, can cause other problems: damp and cold spots, leading to localised mould problems; the fact that you have booklice hints that there may be a mould problem somewhere, because booklice feed on mould.

Besides, whilst spiders may appear to be welcome because they could prey on pests, eventually the spiders themselves will die somewhere in a corner and then provide a lovely snack for something else - perhaps a little stop over for a woolly bear to give it enough energy to make it into your taxidermy collection. Anthrenus and Reesa larvae love the abdomens of large spiders.

I would check the integrity of the building envelope if I had large numbers of spiders entering the building.

Best wishes
Christian


Dr Christian Baars ACR
Senior Preventive Conservator
National Museum Cardiff




From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> On Behalf Of Fiona Hernandez
Sent: 01 November 2018 20:59
To: nhcoll-l at mailman.yale.edu
Subject: [Nhcoll-l] spiders

Is there such a thing as too many spiders in collections storage areas? We have recently had a noticeable bump in spider populations in our storage. no signs of collections pests in the traps, except booklice. Should we be worried? Would it mean we may have a bump in spider prey? I am glad they are around to eat insects, but they seem to be getting much more numerous and physically large....

Fiona Hernandez
Conservator
Museum of Vancouver
1100 Chestnut Street
Vancouver, British Columbia V6J 3J9
T. 604.730.5315
www.museumofvancouver.ca<http://www.museumofvancouver.ca/>

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