The life cycle and larval growth of Drusus annulatus Stephens (Trichoptera: Limnephilidae) in a mountain stream

2009 ◽  
Vol 47 (2) ◽  
pp. 191-199
Author(s):  
A. M. GOWER
Keyword(s):  
Life Cycle ◽  
Larval Growth ◽  
Mountain Stream

scholarly journals Larval development of the plantainfeeding moth Scopula rubraria (Doubleday) (Lepidoptera Geometridae)

2014 ◽  
Vol 67 ◽  
pp. 327-327
Author(s):  
B.A. Philip ◽  
C.M. Ferguson
Keyword(s):  
Life Cycle ◽  
New Zealand ◽  
Native Species ◽  
Larval Growth ◽  
Maximum Weight ◽  
Forage Crop ◽  
Australian Species ◽  
Laboratory Colony ◽  
Significant Damage ◽  
Grass Sward

Tonic plantain has become a popular forage crop but several Lepidoptera species not traditionally considered pests have caused significant damage in some stands At least two species of looper caterpillars (Family Geometridae) commonly referred to as plantain moths Scopula rubraria and Epyaxa rosearia have been associated with serious defoliation Both are thought to be New Zealand native species with S rubraria also present in Australia Leafroller caterpillars (Family Tortricidae) Merophyas leucaniana (New Zealand native) and M divulsana (Australian species) have also been found damaging plant crowns Scopula rubraria were collected from a Manawatu plantain/grass sward A laboratory colony was Five larval instars for both sexes were observed; mean weights at the start of each instar were 004 032 164 460 and 995 mg Most larval growth occurred in the fifth instar with mean maximum weight being 3565 mg Mean durations of each instar were 54 48 35 42 and 101 days and the total larval stage was 280 days Pupal duration averaged 118 days Resultant adults began laying eggs 12 days after eclosion and these hatched in 7 days The total length of the life cycle was approximately 49 days

LARVAL GROWTH AND DEVELOPMENT OF ARGIA VIVIDA (ODONATA: COENAGRIONIDAE) IN WARM SULPHUR POOLS AT BANFF, ALBERTA

1977 ◽  
Vol 109 (12) ◽  
pp. 1563-1570 ◽  
Author(s):  
Gordon Pritchard ◽  
Brian Pelchat
Keyword(s):  
Life Cycle ◽  
Rapid Growth ◽  
Growth And Development ◽  
Larval Growth ◽  
Head Capsule ◽  
Temperature Dependent ◽  
Vernal Equinox ◽  
Larval Instars ◽  
Head Capsule Width ◽  
Major Shift

AbstractSamples of a population of Argia vivida Hagen larvae were taken at about monthly intervals from a series of warm sulphur pools at Banff, Alberta, from June 1973 to December 1974. Changes in head capsule width and wing pad length in field-collected and laboratory-reared specimens show that the life-cycle is univoltine. Only the final (Z) instar can be recognized with certainty, but methods are described whereby the population can be divided into size classes which are thought to correspond well with the last nine larval instars. Periods of rapid growth occur in the autumn and again in the spring. Larvae overwinter in the instars U, V, W, X, and Y and the major shift to the final instar occurs in March and April. Adults emerge from April to August. In the laboratory, growth is temperature dependent until the penultimate (Y) instar and this could be a factor in the field since, although larvae can exist year-round at a constant 26 °C, some larvae live in the cooler areas at the edges of the streams and pools. Entry to the final instar appears to require the long photoperiods that follow the vernal equinox.

Larval and pupal description, life cycle, and adult flight behaviour of the sponge-feeding caddisfly, Ceraclea nigronervosa (Retzius), in Central Norway (Trichoptera)

1981 ◽  
Vol 12 (3) ◽  
pp. 311-319 ◽  
Author(s):  
John Solem ◽  
Vincent Resh
Keyword(s):  
Life Cycle ◽  
Great Britain ◽  
North America ◽  
Green Algae ◽  
Life Cycles ◽  
Mountain Stream ◽  
Freshwater Sponge ◽  
Mixed Species ◽  
Flight Behaviour ◽  
Larval Instars

AbstractDescription of Ceraclea nigronervosa (Retzius) larvae and pupae based on Norwegian specimens generally agree with those from Great Britain and North America, but differ from published Russian (U.S.S.R.) descriptions, probably due to the latter's being based on mixed species rearings. At least the last four of the five larval instars feed on freshwater sponge Spongilla lacustris (L.). Growth from the second instar on follows Dyar's rule with a 1.7 factor of increase. A population in the mountain stream Anfinnså, Dovre County, Norway (63°N and elevation 930-936 m) has a two cohort population with two years required for development. Greater numbers of Chironomidae, but not C. nigronervosa, occur in sponges containing the green algae Chlorella. Sponge-feeding Ceraclea may exhibit flexible life cycles.

A 7-year life cycle for two Chironomus species in arctic Alaskan tundra ponds (Diptera: Chironomidae)

1982 ◽  
Vol 60 (1) ◽  
pp. 58-70 ◽  
Author(s):  
Malcolm G. Butler
Keyword(s):  
Life Cycle ◽  
Slow Growth ◽  
Larval Growth ◽  
Standing Stock ◽  
Open Water ◽  
Life Cycles ◽  
The Arctic ◽  
Larval Size ◽  
Larval Stages ◽  
Tundra Ponds

The life cycles of two sibling Chironomus species inhabiting tundra ponds on the arctic coast of Alaska are interpreted from larval and adult data collected over 3 years. Emergence of adults was highly synchronous within each species, and the two emergence periods were always discrete. Larvae of the two species could not be separated morphologically and were treated as a single population through most of the life cycle. Analysis of larval size and development toward pupation indicated that seven cohorts coexist on nearly all sampling dates. A 7-year developmental period for each cohort is hypothesized and is supported by larval growth rates observed in the habitat and by the rates at which apparent cohorts progressed through the larval stages. Ten cohorts observed during the study period showed very similar schedules of growth and development, but cohort abundances varied considerably.This life cycle is among the longest reported for an arctic insect. It results from slow growth during an annual open-water season of about 90 days, though neither food nor temperature limitation could be definitely implicated in causing such slow growth. Coexistence of up to seven cohorts in each species stabilized Chironomus production and standing stock and may be important to benthic-feeding waterfowl which use these ponds.

The life history of Zapada columbiana (Plecoptera: Nemouridae) in a Rocky Mountain stream

1984 ◽  
Vol 62 (7) ◽  
pp. 1273-1281 ◽  
Author(s):  
R. A. Mutch ◽  
G. Pritchard
Keyword(s):  
Life Cycle ◽  
Emerging Adults ◽  
Rocky Mountain ◽  
Gut Contents ◽  
Mountain Stream ◽  
Predominant Component ◽  
Conifer Needles ◽  
History Of ◽  
Autochthonous Production ◽  
Salix Glauca

The life cycle of Zapada columbiana (Claassen) is basically 3 years in a subalpine stream in the Rocky Mountains of Alberta, although some individuals may complete their life cycle in 2 years. Adults emerged from mid-April to early June and did not disperse far from the stream. Emerging adults and ovipositing females showed no tendency to move upstream. The eggs hatched prior to winter of the same year and growth of larvae was confined to the ice-free period of June to November. It was estimated that at any time during the growth season at least 50% of the population in the stream was in moss covering boulders and cobbles in riffles. Moss was the predominant component in guts of larvae taken from moss, and detritus predominated in guts of larvae from other habitats. During the winter, detritus (from conifer needles) was the major component of the gut contents. Experiments demonstrated that larvae grew faster on moss than on conditioned Salix glauca leaves. Larvae grew on conifer needles only when the latter were highly conditioned and fragmented. This study has indicated that Zapada columbiana, an abundant shredder in many Rocky Mountain subalpine creeks, is as dependent on the autochthonous production of moss as it is on allochthonous detritus.

scholarly journals Ocean-scale connectivity and life cycle reconstruction in a deep-sea fish

2014 ◽  
Vol 71 (9) ◽  
pp. 1312-1323 ◽  
Author(s):  
Craig Longmore ◽  
Clive N. Trueman ◽  
Francis Neat ◽  
Per Erik Jorde ◽  
Halvor Knutsen ◽  
...  
Keyword(s):  
Life Cycle ◽  
Trace Element ◽  
Oxygen Isotope ◽  
Deep Sea ◽  
Life Stage ◽  
Larval Growth ◽  
Conclusive Evidence ◽  
Warm Water ◽  
The North ◽  
Ontogenetic Migration

As human exploration and harvesting moves to the high seas, ecological understanding of the deep sea has become a priority, especially in those commercially exploited species whose life cycle, habitat use, and demographic structure remain poorly understood. Here we combine otolith trace element and stable isotope analyses with microsatellite data to investigate population structure and connectivity in the migratory deep-sea black scabbardfish (Aphanopus carbo), sampled along a latitudinal gradient spanning much of the known species range in the Northeast Atlantic. In each sampled life stage, otolith trace element and oxygen isotope compositions are similar among fish from different capture locations, but otolith compositions vary greatly between life stages. Oxygen isotope compositions indicate ontogenetic migrations from relatively warm water conditions during larval growth to cooler waters with increasing age. Analysis of microsatellite DNA also suggests lack of genetic structure among the areas sampled. The multidisciplinary approach employed collectively suggests that A. carbo individuals undergo an ocean-scale ontogenetic migration, beginning with spawning in southern, warm-water Macaronesian areas (potentially dominated by Madeira), followed by a large proportion of immature fish moving to and feeding on the continental slope in northern areas. The results lend the first conclusive evidence for defining the life-history circuit of this species and the perception of its stock structure across the North Atlantic.

scholarly journals Biology study of white grub Holotrichia nagpurensis (Scarabaeidae: Melolonthinae)

2021 ◽  
Vol 2 (1) ◽  
pp. 57-60
Author(s):  
Seema Rani ◽  
◽  
Riazuddin . ◽  
Rinni Saharwat ◽  
Manish Sharma ◽  
...  
Keyword(s):  
Life Cycle ◽  
Agricultural Research ◽  
Insect Pest ◽  
Larval Growth ◽  
Growth Index ◽  
Melia Azedarach ◽  
Adult Longevity ◽  
National Bureau ◽  
Moist Soil ◽  
Maize Roots

Biology of polyphagous insect pest Holotrichia nagpurensis was studies in laboratory during 2019-2020. H. nagpurensis beetles (all types mated, unmated, male and female) were collected by using Light traps (fitted with 6-8 watts mercury tube Light; ACTINIC BL, PHILIPS) placed nearby host Neem trees, Azadirachta indica, Guava, Psidium guajava, Bakayan, Melia azedarach, in evening time from 7:45 to 9: 45 pm in the moths of June-July from Noorpur village in Ghaziabad district of Uttar Pradesh, India (28.7444° N, 77.5526° E) and identified by National Bureau of Agricultural Insect Resources, Bengaluru, Indian Council of Agricultural Research. All collected beetles kept individually in 1 liter capacity containers with moist soil. The mated female laid eggs an average of 29.800±3.247 eggs singly at a depth of 5-10 cm in the moist soil. The incubation period of the eggs was 12.960±0.501 days. 1st instars lasted 17.660±0.510 days; subsequent 2nd and 3rd instars were lasted for 35.140±0.530 and 86.120±0.800 days, respectively. The pupal period was recorded about 25.860±0.515 days and adult longevity was observed 101.860±3.575 days. Total life cycle recorded 277.960±3.371 days with 59.840±4.676 % survival and 0.518±0.039, 3.548±0.080 and 0.368±0.026 larval growth index, pupal growth index and developmental index respectively. All grubs feed on live maize roots in controlled conditions up to pupation. The simple methodology for rearing of root grubs on live maize roots under laboratory conditions was attempted and life cycle of H. nagpurensis was studied successfully.

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