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15418Re: [ScottishMoths] Re: Do migrating moths necessarily have to have a proboscis to refuel?

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  • Stan Campbell
    Sep 19, 2014
      Hi Roy
       
      Thanks for that! Though, I hadn't realised moth gonads were that heavy
       
      All the best
      Stan 


      On Friday, September 19, 2014 3:00 PM, "roy345@... [ScottishMoths]" <ScottishMoths@yahoogroups.com> wrote:


       
      Hi Stan,
                   Almost certainly, swift moths don't migrate. For one thing, they fly very close to the ground. Your point about the lack of a proboscis is almost certainly relevant, because migration uses up not just food resources but water too. Without a proboscis, these can't be replaced.

      When we look at well-known migrants like Silver Y, Convolvulus Hawk-moth, Vestal and Gem, Dark Sword-grass, Scarce Bordered Straw, Cliden Nonpareil and so on, all of them are strongly attacted to nectar sources, often more so than to light traps.

      In Britain we get very few migrants from the groups that can't feed. Tiger moths - a couple of Patton's Tiger. Tussocks - male Gypsy Moth occasionally crosses the Channel to the south coast, but that is only 30 miles. Eggars - just a handful of Pine-tree Lappets. Prominents - maybe half a dozen Three-humped Moths, a couple of Large Dark Prominent and Dusky Marbled Brown. These will be casual strays rather than migrants as such. The lifestyle of a true migrant is rather specialised. Often the gonads are undeveloped when the moth emerges, to save weight on the journey.

      Roy


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