Periodic emergence in some North European chironomids

“…Diurnal emergence rhythms, which are widespread among aquatic insects (Phillipp, 1938;Miller, 1941;Scott & Opdyke, 1941;Palmen, 1958;Morgan, 1958;Morgan & Waddell, 1961), were obvious for almost all insects in Lake Mindelsee: maximum emergence varied considerably (on July 6th/7th between 8 p.m. and 10 p.m. and between 2 a.m. and 8 a.m., on August 24th/25th between 6 p.m. and 10 p.m. and between 4 a.m. and 10 a.m.). Beginning of maximum emergence occurred two hours earlier in August, due to the earlier sunset.…”

Section: Emergence Rhythmsmentioning

confidence: 99%

“…Beginning of maximum emergence occurred two hours earlier in August, due to the earlier sunset. The daily increases and decreases of the light intensity are discussed as the main exogene timing mechanism for this endogenously governed phenomenon (Palmen, 1958;Morgan & Waddell, 1961;Remmert, 1962).…”

Section: Emergence Rhythmsmentioning

confidence: 99%

Insect emergence from a shallow southern West German lake, with special reference to the parasitic host-associated water mite larvae

Smukalla

Meyer

1988

Hydrobiologia

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Insect emergence was studied with floating box traps in the littoral of Lake Mindelsee from July 1st until September 30th, 1984. The material was collected every 48 h. Out of the total catch of 6897 specimens per m 2 , 75.1% belonged to the Chironomidae, 4,9% to the Chaoboridae, 15,4% to the Ephemeroptera and 3,2% to the Trichoptera.Endochironomus sp., Lauterborniella agrayloides, Polypedilum pullum (Chironomidae) and Oocetis testacea (Trichoptera) are reported for the first time from Lake Mindelsee.The seasonal course of the total emergence showed two distinct peaks: one at the end of July, the other at the beginning of September.Diurnal emergence was studied on two occasions, in July and in August. Most of the insects emerged during dusk and dawn.Species composition and degree of water mite infection of the collected nematocerans were studied. Host range and specific attachment sites of the different water mite taxa could only be established on the genus or family-level, with the exception of the most common water mite species Hydrodroma despiciens. In addition to its main host Chaoborusflavicans, this mite species infested 16 chironomid species with Corynoneura sp., Cryptocladopelma viridula, Pseudochironomusprasinatus and Tanytarsus lactescens as new records. The larvae of Hydrodroma despiciens were attached almost exclusively to the thorax of the imagines. Chaoborusflavicans, and within the Chironomidae Procladius sp. of the subfamily Tanypodinae, showed the highest average mite load. Species of the subfamily Chironominae were also heavily infested (e.g. Microtendipes sp., infestation rate 76% with a maximum mite load of 18). Within the representatives of the subfamily Orthocladiinae however, only low infestation rates occurred with maximum one larva per host.Finally, problems like the synchronization of the life-cycles of hosts and parasites and strategies of coexistence between the different water mite taxa parasitizing one host are discussed.

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“…That some, at least, of such rhythms are able to persist from one developmental stage to another is well demonstrated by experimental work in which larvae exposed to conditioning regimes at a relatively early stage have been subsequently maintained under constant conditions and yet have emerged at the same time of day as have controls [31,38,39].…”

mentioning

confidence: 99%

Patterns of Circadian Rhythms in Insects

Corbet¹

1960

Cold Spring Harbor Symposia on Quantitative Biology

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One important aspect of circadian rhythms--their ecological significance--can seldom be understood except from the result of observations made in nature. By the same token, rhythms observed in the field are often difficult to interpret on account of the numerous environmental factors which may affect their manifestation. There is, however, much to be learned from such studies, particularly, I think, with regard to the time cues which position cyclical activities.

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Periodic emergence in some North European chironomids

Cited by 3 publications

References 3 publications

Circadian Rhythms in Insects

Circadian Rhythms in Insects

Insect emergence from a shallow southern West German lake, with special reference to the parasitic host-associated water mite larvae

Patterns of Circadian Rhythms in Insects

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