Happy Valentine's' Day

So, back to the question of our survey effort in 2021... There were several steps of forward and back. As one way to start. I selected several peak years.

You can see that cherry-picking years isn't apples to apples (sorry). The years most like 2021 were the recent survey years, so after some other starts and stops I ended up with an average of Species and Observations for the years 2016-2020. Next graphed those averages against 2021. Here are the charts on # Observations and # Species recorded for the standard date intervals. For Observations, this is stack of 2021 to the average. Species is shown as a line.

Looks like we're in the zone. Putting these together...

Observations and the number of species track together, peaking in June. Moving forward the recent years average will provide a baseline to compare current individual years.

Compared to the average, across the periods, 2021 had a little better numbers, about an 3% increase in the number of species and about a 28% increase in observations. Good effort.

Publicado el febrero 14, 2022 06:43 TARDE por jimlem jimlem


Very nice. I especially like the plot of # of species vs week of the year. The last plot is interesting. I would have expected a closer correlation between total observations and number of species detected. Maybe this means finding a species is not a random event...if you know where they live you can find them...even if only in small numbers.

Publicado por mikeabel hace alrededor de 2 años

Would it be helpful to compare with other dragonfly and damselfly survey efforts? For example in other states, or a federal survey of some sort?

Publicado por cecildev8n5 hace alrededor de 2 años

Sure, it would be a matter of having the data.

Publicado por jimlem hace alrededor de 2 años

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