scholarly journals Life History of an Endangered Marine InsectHalovelia septentrionalisEsaki (Hemiptera: Veliidae)

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Terumi Ikawa ◽  
Aika Nakazawa
Keyword(s):  
Life History ◽  
Rocky Shore ◽  
Adult Stage ◽  
Marine Water ◽  
Marine Environments ◽  
Water Striders ◽  
Conservation Measures ◽  
Japanese Coast ◽  
History Of

Halovelia septentrionalisEsaki is one of the endangered marine water striders found along the Japanese coast. It is of primary importance to investigate its life history in the field so as to develop conservation measures as well as to understand how this species has adapted to marine environments. We studied its life history in Misaki on the southern part of the Miura Peninsular near Tokyo, ca. 35°N, probably the northernmost locality not only forH. septentrionalisbut also for anyHaloveliaspecies, most of which are found in warm tropical or subtropical waters. The southern part of the Miura Peninsular has jagged coastlines with deep inner bays. Adults and nymphs were found skating along the rocky shore of inner bays with overhanging vegetation nearby. This species appeared to have at least 2 generations a year and to overwinter in the adult stage. We discussed its overwintering strategy in comparison to those of two other Japanese marine water striders.

scholarly journals The latitudinal uniformity of the unique life history of Velia caprai (Heteroptera: Veliidae) and notes to the pre-overwintering period of selected water striders (Heteroptera: Gerridae)

2019 ◽  
Vol 22 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Tomáš Ditrich ◽  
Miroslav Papáček ◽  
Mikko Heino
Keyword(s):  
Life History ◽  
Central Europe ◽  
Life Histories ◽  
Adult Stage ◽  
Reproductive Diapause ◽  
Temperate Water ◽  
Central European ◽  
Water Striders ◽  
European Water ◽  
History Of

Temperate water striders (Gerridae) overwinter as adults and die after spring reproduction. European water cricket Velia caprai (Veliidae) overwinters concurrently in egg and adult stage in Central Europe. This rare overwintering strategy goes with longevity ofthis species. Adults can survive two winters in Central Europe, unlike other semiaquatic bugs. Scandinavian populations of V. caprai and water striders Gerris lacustris and G. lateralis were examined at the beginning and end of September to determine their life histories. Both gerrids start to overwinter during September, females prior to males and macropterous individuals prior to brachypterous. All females of G. lacustris and G. lateralis enter reproductive diapause before winter. V. caprai overwinters in both adult and egg stage in Norway, and can probably survive two winters. Central European and Scandinavian populations of V. caprai share the same unusual way of overwintering and probably also the whole life history.

The Life History and Habits of Chrysomela crotchi Brown (Coleoptera: Chrysomelidae) in Northwestern Ontario

1965 ◽  
Vol 97 (5) ◽  
pp. 541-549 ◽  
Author(s):  
E. P. Smereka
Keyword(s):  
Life History ◽  
Adult Stage ◽  
Egg Mass ◽  
Predator Species ◽  
Control Factors ◽  
Northwestern Ontario ◽  
History Of ◽  
Males And Females ◽  
Overwintering Mortality ◽  
Larval Parasites

AbstractThe life history of Chrysomela crotchi, a univoltine species commonly found on trembling aspen, was studied in northwestern Ontario from 1959 to 1962. The most striking feature of its life history was the longevity of adults, which were capable of overwintering two successive years. Overwintered adults became active and began feeding in late May, and oviposition occurred from early June to late July. The incubation period was approximately 10 days and the three larval instars required approximately one month for development to the adult stage.Females laid more eggs during their second season and the highest number laid was 326. The number of eggs in an egg mass averaged 37.6, and the average interval between the deposition of egg masses was 4 days. Males and females mated more than once, but only one mating was necessary for a female to produce viable eggs throughout the season. Males were capable of fertilizing more than one female and remained potent for more than one season.Parasitism was low, and only two species of larval parasites were reared. Several predator species were observed preying on the immature stages. Predation and overwintering mortality appeared to be the most important control factors.

The Occurrence, Ecology and Life History of Tigriopus fulvus (Fischer)

1936 ◽  
Vol 20 (3) ◽  
pp. 523-536 ◽  
Author(s):  
James H. Fraser
Keyword(s):  
Life History ◽  
Adult Stage ◽  
Single Female ◽  
Isle Of Man ◽  
History Of ◽  
Copepodid Stage

The peculiar and exacting environment of Tigriopus fulvus is discussed and a census of Tigriopus from a series of pools in the Isle of Man is given.Experiments have been made determining the resistance of Tigriopus to desiccation and its revival in favourable circumstances.The life history has been worked out, times taken in development noted, and the various stages compared and contrasted with those described by Guiglia.Sex can be determined at the fourth copepodid stage. Females are normally fertilised as fifth copepodids, but the males are not functional until the adult stage. A single female may produce several egg sacs giving rise to living nauplii from a single fertilisation.There is no evidence for parthenogenesis.

Experimental life history of Echinostoma cinetorchis

1990 ◽  
Vol 28 (1) ◽  
pp. 39 ◽  
Author(s):  
S H Lee ◽  
J Y Chai ◽  
S T Hong ◽  
W M Sohn
Keyword(s):  
Life History ◽  
History Of
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