Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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Konchu on May 9, 2014May 9th, 2014, 10:06 am EDT
Interesting article about Didymo in New Zealand & elsewhere
http://www.nzherald.co.nz/jamie-morton/news/article.cfm?a_id=729&objectid=11252518
http://www.nzherald.co.nz/jamie-morton/news/article.cfm?a_id=729&objectid=11252518
Falsifly on May 9, 2014May 9th, 2014, 12:38 pm EDT
Ah! The dreaded, “climate change and other human-caused environmental changes” and the “ever-increasing international travel” will be the fall of us all. To think that life has evolved and adapted for eons only to finally succumb to global destruction at the hands of mankind leaves me saddened that my short visit was, in the greater scheme of things, part of its demise.
However, in the case of New Zealand my legal obligation to “strict biosecurity rules” has been met and I claim complete immunity.
As to the question of “spread?”. It wasn’t me, I will use the “absence of evidence” that I ever stepped foot in New Zealand as my “evidence of absence”.
The so-called "rock snot" has not yet been found in North Island rivers and under strict biosecurity rules, people are legally obliged to prevent spreading it.
However, in the case of New Zealand my legal obligation to “strict biosecurity rules” has been met and I claim complete immunity.
The paper's lead author, Professor Brad Taylor, said didymo blooms were hastily attributed to human introductions or the emergence of new genetic strain because the absence of evidence was used as evidence of absence in many locations.
As to the question of “spread?”. It wasn’t me, I will use the “absence of evidence” that I ever stepped foot in New Zealand as my “evidence of absence”.
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
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