Friday, September 11, 2020

Invasion!

I went downtown. The drive-through window at the pharmacy was covered with moths. The pharmacist told me to look at the other side of the building. Moths everywhere!

Phantom hemlock looper moth, Nepytia phantasmaria

I checked the news. There has been an outbreak of these moths all over the coast, both on the island and the mainland.

... foresters say looper moth outbreaks are a natural and predictable occurrence — with the insect's population spiking every 11 to 15 years on the coast and every 20 in the Interior.
... "This is a natural process," said Montgomery "It's by no means unhealthy for the forest as a living being, and we expect the biodiversity to actually result in greater resilience of that forest to future disturbances." (CBC News)

The caterpillars eat the needles of evergreens like hemlock, Douglas-fir, and cedar. Some trees die; most recover.

I find it interesting that they're all over downtown buildings, but here, only a few blocks away, there's not a sign of them. Is it warmer downtown? Or windier up here?

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Fuí al centro y vi la ventana de autoservicio de la farmacia toda cubierta de mariposas nocturnas. La farmacóloga me dirigió al otro lado del edificio. ¡Cientos de mariposas!

Es la mariposa nocturna "Nepytia phantasmaria". Sus larvas comen las acículas de árboles coníferas.

En las noticias, leí que ahorita hay una invasión de esta polilla en toda la costa, ya sea en el continente o en la isla. No hay de que preocuparnos; es un proceso natural; cada década hay un aumento en los números de este insecto, pero el bosque aguanta, y hasta puede resultar más resistente.

Me llama la atención que la polilla está en los edificios del centro, pero aquí a unas cuantas cuadras de distancia, no se ve ni una. ¿Será que hace más calor entre los edificios y el tráfico? ¿O que hay más viento aquí en la ladera?


2 comments:

  1. A couple of years ago I came across a large expanse of cotoneaster covered by tiny hawthorn moths - and more strikingly by their webs. I took photographs but never got round to posting about them. However I'll give a link here to a photograph on another site so you can see how surprising they are. https://www.naturespot.org.uk/node/164801

    ReplyDelete
    Replies
    1. Wow! Those are like our tent caterpillars, except they target deciduous trees, not shrubs. But your webs are prettier.

      Delete

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