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.

The life history of Philocasca alba (Trichoptera: Limnephilidae) in a Rocky Mountain stream

1984 ◽  
Vol 62 (7) ◽  
pp. 1282-1288 ◽  
Author(s):  
R. A. Mutch ◽  
G. Pritchard
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Rocky Mountains ◽  
Laboratory Experiments ◽  
Larval Instar ◽  
Rocky Mountain ◽  
Mountain Stream ◽  
Flight Period ◽  
Conifer Needles ◽  
History Of

The life cycle of Philocasca alba Nimmo spans 3 years in a cold, second order, subalpine stream in the Rocky Mountains of Alberta. The flight period was from mid-May to late July. Larval instar 1 was found only in August–September; all other four instars were present in samples throughout most of the year. In their third autumn in the stream larvae in the final instar burrowed into gravel, pupated, and overwintered. Growth was confined to the ice-free period, June to November, when larval densities were greatest among deposits of conifer needles, cones, and woody material in pools. Larvae from these detrital accumulations had mainly fragments of conifer needles in their guts, although laboratory experiments showed that larvae could feed and grow on conifer needles only if they were highly conditioned. The later instars, particularly instar V, constituted a much greater than expected proportion of total larvae among submerged bank vegetation in spring and summer and deciduous leaves in autumn. Larvae in these two microhabitats mainly had fragments of moss and fragments of leaves, respectively, in their guts. The importance of moss was confirmed by a field experiment which showed that fifth instar larvae had significantly faster growth rates when fed on detritus supplemented with bank moss than detritus alone or detritus supplemented with deciduous leaves during the autumn.

The life history of Dicosmoecus atripes (Hagen) (Limnephilidae: Trichoptera) in a Rocky Mountain stream of Alberta, Canada

1983 ◽  
Vol 61 (3) ◽  
pp. 586-596 ◽  
Author(s):  
Vytenis Gotceitas ◽  
Hugh F. Clifford
Keyword(s):  
Life Cycle ◽  
Abiotic Factors ◽  
Rocky Mountain ◽  
Annual Production ◽  
Mountain Stream ◽  
Microhabitat Selection ◽  
Biomass Turnover ◽  
First Instar ◽  
History Of ◽  
Early Instar

Dicosmoecus atripes (Hagen) has a 2-year life cycle in Dyson Creek, Alberta, a second order foothills stream of the eastern Canadian Rockies. Emergence and oviposition occur from August to mid-October. The first winter is spent as first instar larvae, the second as inactive fifth (final) instars in a form of diapause. No growth was observed in overwintering first instar larvae, and a significant (P < 0.05) weight loss was recorded in overwintering fifth instar larvae. Temperature seems to be the most important factor responsible for the 2-year life cycle. Annual production was estimated at 91.4 mg∙m−2∙year−1, with an annual production and biomass turnover (P/B) ratio of 4.97. Larval diet and microhabitat changed between instars. The proportion of diatoms in the diet of early instar larvae was significantly (P < 0.001) greater than that of third and later instars. Early instar larvae inhabit stream margins, while larvae of third and later instars were mainly found in midstream reaches. Larvae of all instars preferred pools to riffles. Abiotic factors important in microhabitat selection seemed to differ between larval instars.

Analysis of a Population Sampling Method for the Lodgepole Needle Miner in Canadian Rocky Mountain Parks

1952 ◽  
Vol 84 (10) ◽  
pp. 316-321 ◽  
Author(s):  
R. W. Stark
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Sampling Method ◽  
Rocky Mountain ◽  
Fixed Time ◽  
Forest Stand ◽  
Population Sampling ◽  
Adequate Sampling ◽  
History Of ◽  
External Feeding

General.—The purpose of this paper is to analyse a sampling method devised to assess larval populations in an outbreak of the lodgepole needle miner, Recurvaria milleri Busck (Busck 1914, Hopping 1945).The problem of developing an adequate sampling method is intimately concerned with the life-history of the insect, the region of the outbreak and the nature of the forest stand in which the outbreak occurs. In sampling most defoliator populations the problem is made more difficult by external feeding and wandering habits, hence it is usually done in some relatively inactive stage at a fixed time. de Gryse (1934) describes the problems inherent in sampling these insects. The needle miner, however, is fixed in its location for most of its life-cycle and is therefore readily obtainable for study. The problem here is reduced to a statistical one, that of obtaining an acceptable sample i.e. within suitable error limits with due regard for existing variables.

scholarly journals Nymphal biology of Brachyptera risi (Morton, 1896) (Plecoptera: Taeniopterygidae) in a North Apennine stream (Italy)

2008 ◽  
Vol 19 (4) ◽  
pp. 228-231 ◽  
Author(s):  
Stefano Fenoglio ◽  
Tiziano Bo ◽  
Jesus López-Rodríguez ◽  
José Tierno de Figueroa
Keyword(s):  
Organic Matter ◽  
Life History ◽  
Life Cycle ◽  
Principal Component ◽  
Gut Contents ◽  
Trophic Plasticity ◽  
Egg Diapause ◽  
Fine Particulate ◽  
History Of ◽  
European Populations

Some aspects of the life history of a population of Brachyptera risi were investigated in a North Apennine stream and compared with previously studied European populations. In our study area, this species showed a univoltine fast seasonal life cycle. Nymphs were present from January to the beginning of May, probably spending the rest of the year mainly in egg diapause. Fine particulate organic matter was the principal component of the diet, while diatoms and other algae were also found in the guts. This finding suggests the existence of greater trophic plasticity of the species. Individuals of this population act as gatherer-collectors but not as scrapers as usually pointed out for other European populations. We also detected considerable amounts of animal matter in the gut contents. The density of B. risi nymphs in the study area was very variable during the study period, ranging from 0 to 2,348 ind/m2.

Rites of Passage

2018 ◽  
Author(s):  
Axel Michaels
Keyword(s):  
Life Cycle ◽  
Old Age ◽  
Sexual Maturity ◽  
Rites Of Passage ◽  
Life And Death ◽  
Transformational Process ◽  
Local Contexts ◽  
Vulnerable Community ◽  
History Of ◽  
The Individual

This chapter examines the classical Hindu life-cycle rites, the term saṃskāra and its history, and the main sources (Gṛhyasūtras and Dharma texts). It presents a history of the traditional saṃskāras and variants in local contexts, especially in Nepal. It describes prenatal, birth and childhood, initiation, marriage, old-age, death, and ancestor rituals. Finally, it analyzes the transformational process of these life-cycle rituals in the light of general theories on rites of passage. It proposes, in saṃskāras, man equates himself with the unchangeable and thus seems to counteract the uncertainty of the future, of life and death, since persons are confronted with their finite existence. For evidently every change, whether social or biological, represents a danger for the cohesion of the vulnerable community of the individual and society. These rituals then become an attempt of relegating the effects of nature or of mortality: birth, teething, sexual maturity, reproduction, and dying.

scholarly journals Thermal Characteristics of a Beaver Dam Analogues Equipped Spring-Fed Creek in the Canadian Rockies

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 990
Author(s):  
Tariq M. Munir ◽  
Cherie J. Westbrook
Keyword(s):  
Thermal Characteristics ◽  
Cutthroat Trout ◽  
Rocky Mountain ◽  
Optimal Growth ◽  
Stream Temperature ◽  
Mountain Stream ◽  
Suitable Habitat ◽  
Restoration Technique ◽  
Beaver Dam ◽  
In Series

Beaver dam analogues (BDAs) are becoming an increasingly popular stream restoration technique. One ecological function BDAs might help restore is suitable habitat conditions for fish in streams where loss of beaver dams and channel incision has led to their decline. A critical physical characteristic for fish is stream temperature. We examined the thermal regime of a spring-fed Canadian Rocky Mountain stream in relation to different numbers of BDAs installed in series over three study periods (April–October; 2017–2019). While all BDA configurations significantly influenced stream and pond temperatures, single- and double-configuration BDAs incrementally increased stream temperatures. Single and double configuration BDAs warmed the downstream waters of mean maxima of 9.9, 9.3 °C by respective mean maxima of 0.9 and 1.0 °C. Higher pond and stream temperatures occurred when ponding and discharge decreased, and vice versa. In 2019, variation in stream temperature below double-configuration BDAs was lower than the single-configuration BDA. The triple-configuration BDA, in contrast, cooled the stream, although the mean maximum stream temperature was the highest below these structures. Ponding upstream of BDAs increased discharge and resulted in cooling of the stream. Rainfall events sharply and transiently reduced stream temperatures, leading to a three-way interaction between BDA configuration, rainfall and stream discharge as factors co-influencing the stream temperature regime. Our results have implications for optimal growth of regionally important and threatened bull and cutthroat trout fish species.

Thrombocytopenia in Rocky Mountain Spotted Fever

PEDIATRICS ◽  
1966 ◽  
Vol 37 (2) ◽  
pp. 386-386
Author(s):  
WINIFIELD STRYKER
Keyword(s):  
Spotted Fever ◽  
Rocky Mountain ◽  
Whole Body ◽  
Rocky Mountain Spotted Fever ◽  
History Of

The case of Rocky Mountain Spotted Fever with multiple coagulation disturbances reported in Pediatrics (36:627, 1965) was similar to a recent patient's. This was a 2½ year old girl with a 9 day history of fever and rash. She was comatose and had papular lesions, many of which were hemorrhagic, involving the whole body (including palms and soles) plus many small flat petechiae. A sibling had died 2 days before with an identical history.

Sign in / Sign up

Export Citation Format

Share Document