Early February

Following up on a post from a year ago: 'How are we doing with our survey effort?' From the data, let's look again at the combinations of county and species. With the 2023 data, we have 6,806 combinations of the 88 Ohio counties and the possible species. This number grows as County Records are established. We can compare this cumulative number to individual years, or now that we have 7 years of survey data, a multi-year accumulation. The chart shows the most recent years. In orange is cumulative co|sp value - as theoretical maximum growing year by year (scale is on the left). The blue line is the 1 year % value (right scale) of the max. The green line is the percent of the theoretical max accounted for in the 7 year running accumulation (scale is on the right). Note that prior to the start of the statewide survey, the percent yearly observed was in single digits, even with 7 year data, the % was only in the 20% range.. We are now over 80% - meaning a significant majority of the documented co|sp pairs are being recorded. This helps answer the question - we are doing better, and overall, pretty good.

Comparing pre-1950 data to Survey II (2017-2023), Survey II had 4129 Co|Sp combinations not recorded through 1950. Pre-1950 had 473 not in Survey II. What stands out as missing?

By species.
Rainbow Bluet in 21 Counties.
Lyre-tipped Spreadwing in 20 Counties.
Ruby Meadowhawk in 18 Counties.
White-faced Meadowhawk 14 Counties.

A partial explanation could be habitat loss through various means. Ruby Meadowhawk just needs more/better photos.

By County.
Ashland Co is short 37 species.
Defiance, 27 species.
Erie, 27 species.
Ottawa, 25 species.
Paulding, 35 species.
Williams, 33 species.

All of these deficits are probably due to decreased attention. These would be opportunities.

Publicado el febrero 8, 2024 01:14 MAÑANA por jimlem