Spiders in a fir–spruce biotype: abundance, diversity, and influence on spruce budworm densities

1972 ◽  
Vol 50 (7) ◽  
pp. 1039-1046 ◽  
Author(s):  
T. R. Renault ◽  
C. A. Miller
Keyword(s):  
New Brunswick ◽  
Food Item ◽  
Consumption Rate ◽  
Spruce Budworm ◽  
Spruce Forest ◽  
Population Stability ◽  
Prey Selectivity ◽  
High Consumption ◽  
High Level ◽  
North Western

Results of an intensive 9-year census of the arboreal spider fauna in a fir–spruce forest in north-western New Brunswick and of a 3-year census in similar biotypes in other parts of the province are reported. A total of 129 species were collected, although only 14, mostly web-spinning species make up the bulk of the spider population. Spider density over the years is remarkably stable in any one biotype. Considerable variation in species composition occurs between biotypes, but the density of the total spider complex in each varies little.Field experiments with a web-spinning Dictynid and "planted" populations of second-instar budworm larvae show a high level of predation but the wide prey selectivity, population stability, and other traits of the arboreal spiders suggest that, despite their high consumption rate, these predators are unlikely to respond to sudden outbreaks of a particular food item. It is assumed, therefore, that spiders have little influence in moderating the periodic population explosions of the spruce budworm.

Notes on the Biology of Synetaeris tenuifemur Walley (Hymenoptera: Ichneumonidae)

1963 ◽  
Vol 95 (1) ◽  
pp. 24-28 ◽  
Author(s):  
C. A. Miller ◽  
T. R. Renault
Keyword(s):  
British Columbia ◽  
New Brunswick ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Green River ◽  
Low Level ◽  
Northwestern Ontario ◽  
North Western

The species discussed below was first recorded under the name Synetaeris n. sp. as a parasite of the spruce budworm, Choristoneura fumiferana Clem., in Ontario by McGugan and Blais (1959), although they point out that it may have been collected from budworm in British Columbia during the 1940's but incorrectly identified at that time. These authors collected S. tenuifemur during the declining years of a budworm outbreak in the Lake Nipigon region of northwestern Ontario, and it was during the declining years of a severe outbreak that the parasite was first reared from budworm in the Green River area of north-western New Brunswick (Morris, 1963, in press). These data suggest that S. tenuifemur is associated with endemic budworm populations, an assumption advanced by McGugan and Blais (1959). However, it was not found in the Green River area from 1945 to 1947 when budworm density was at a low level prior to the 1949-1959 outbreak.

Hubungan antara Asupan Karbohidrat dan Lemak dengan Kadar Trigliserida pada Pesenam Aerobik Wanita

2017 ◽  
Vol 19 (2) ◽  
pp. 84-89
Author(s):  
Diah Nur Khasanah ◽  
Idi Setiyobroto ◽  
Weni Kurdanti
Keyword(s):  
Coronary Heart Disease ◽  
Triglyceride Level ◽  
Observational Research ◽  
Fat Intake ◽  
Cross Sectional ◽  
Exact Test ◽  
High Carbohydrate ◽  
High Consumption ◽  
High Level ◽  
High Triglyceride

Background: A long-standing association exists between elevated triglyceride levels and coronary heart disease (CHD). High consumption of fat and carbohydrate influences enhancement of triglycerides level. Sport can reduce cholesterol and triglycerides level. Objective: This research aims to analyze relationship between carbohydrates and fat intakes with triglycerides level on female aerobic gymnasts. Method: This is an observational research using cross sectional research design which was held in Miracle Gymnasium on February17- 18th 2017. 30 subjects were selected as subject because fulfill the requirement (older than 20 years and have willingness to be a subjects). Research variable areintakes of carbohydrate, fat, and triglyceride levels. Result: Result shows 53.3% subjects have high level of carbohydrate and fat intakes followed  by 20% subjects with high level       of triglycerides. Subjects with high level of carbohydrate, fat intakes and high triglyceride level are 28%. Subjects withsufficient carbohydrate, fat intakes and high triglyceride level are 12.5%.Fisher’s exact test was done to prove hypothesis with results there is no significant relationship between carbohydrate and fat intake with triglyceride level. Conclusions: Subjects with high carbohydrate and fat intake is 53.3% and 20% subjects have high triglyceride level. Relationship between carbohydrate and fat intake with triglyceride level on female aerobic gymnasts is not significant (p>0.05).   Keywords: Intake, Carbohydrate, Fat, Aerobic Gymnasts, Triglyceride

The influence of hardwood content on balsam fir defoliation by spruce budworm

1996 ◽  
Vol 26 (9) ◽  
pp. 1620-1628 ◽  
Author(s):  
Qiong Su ◽  
Ted D. Needham ◽  
David A. MacLean
Keyword(s):  
New Brunswick ◽  
Natural Enemies ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
Generalized Model ◽  
Stand Management ◽  
Working Hypothesis ◽  
Model Combining

Changing stand composition by increasing hardwood content has been suggested as a long-term method for reducing susceptibility and vulnerability of balsam fir (Abiesbalsamea (L.) Mill.) to spruce budworm (Choristoneurafumiferana (Clem.)). Twenty-five mixed balsam fir–hardwood stands were selected in northern New Brunswick, with five stands in each 20% hardwood class (0–20, 21–40%, etc.). Defoliation each year from 1989 to 1993 was significantly (p < 0.0001) related to hardwood content, with r2 ranging from 0.57 to 0.81. As hardwood content increased, defoliation of balsam fir decreased. From 1989 to 1992, the years of moderate to severe defoliation, balsam fir stands with <40% hardwoods sustained 58–71% defoliation, on average, versus 12–15% defoliation in stands with >80% hardwood. A generalized model combining hardwood content and the estimated defoliation in pure softwood stands in a given year explained 77% of the variation in defoliation over stands and years. This study indicated that mixed balsam fir–hardwood stand management, with hardwood content >40%, could substantially reduce losses during spruce budworm outbreaks. Further research is warranted to elucidate the mechanism involved, but our working hypothesis is that greater hardwood content increased the diversity or populations of natural enemies such as birds and parasitoids.

scholarly journals Feeding habits of Stellifer rastrifer (Perciformes, Sciaenidae) at Guaratuba mangrove, Parana, Brazil

1998 ◽  
Vol 41 (4) ◽  
pp. 423-428 ◽  
Author(s):  
Paulo de Tarso C. Chaves ◽  
Ana Lúcia Vendel
Keyword(s):  
Feeding Behaviour ◽  
Food Item ◽  
Feeding Habits ◽  
Fish Populations ◽  
The Individual ◽  
High Level ◽  
Individual Size

Feeding habits of Stellifer rastrifer (Perciformes, Sciaenidae) at Guaratuba mangrove, Parana, Brazil, were studied from February 1996 to February 1997. It was observed that its diet was based on invertebrates, mainly Decapoda non-Brachyura and Polychaeta. In a smaller proportion there were plants, Copepoda, Gammaridea and Mollusca. The level of contribution of each food item changed according to the season and the individual size. Such plasticity in feeding behaviour was similar to that described to some fish populations from other estuaries, and could be an indicator of the high level of instability presented by this kind of ecosystem.

High Consumption Rate of Black-Legged Kittiwakes by Common Ravens in a Norwegian Seabird Colony

1995 ◽  
Vol 18 (2) ◽  
pp. 231 ◽  
Author(s):  
Jose L. Tella ◽  
Ignacio Torre ◽  
Tomas Ballesteros
Keyword(s):  
Consumption Rate ◽  
Seabird Colony ◽  
High Consumption

Spruce budworm and management effects on forest and wood product carbon for an intensively managed forest

2010 ◽  
Vol 40 (9) ◽  
pp. 1736-1750 ◽  
Author(s):  
Chris R. Hennigar ◽  
David A. MacLean
Keyword(s):  
New Brunswick ◽  
Management Strategies ◽  
Spruce Budworm ◽  
Wood Product ◽  
Managed Forest ◽  
Insecticide Application ◽  
C Storage ◽  
Biological Insecticide ◽  
Intensively Managed ◽  
Forest C

An integrated forest management optimization model was developed to calculate potential spruce budworm ( Choristoneura fumiferana Clemens) effects on forest and wood product carbon (C) from 2007 to 2057 and to evaluate potential C sequestration benefits of alternative management strategies (salvage, biological insecticide application). The model was tested using simulated spruce budworm outbreaks on a 210 000 ha intensively managed forest in northwestern New Brunswick, Canada. Under a severe spruce budworm outbreak scenario from 2007 to 2020, harvest volume and forest and wood product C storage in 2027 were projected to be reduced by 1.34 Mm3, 1.48 Mt, and 0.26 Mt, respectively, compared with the levels under no defoliation. Under the same severe outbreak scenario, implementation of salvage and harvest replanning plus a biological insecticide applied aerially to 40% of susceptible forest area, reduced harvest, forest C, and wood product C impacts by 73%, 41%, and 56%, respectively. Extrapolation of these results to all of New Brunswick suggests that a future severe spruce budworm outbreak could effectively increase total provincial annual C emissions (all sources) by up to 40%, on average, over the next 20 years. This modeling approach can be used to identify to what extent insecticide application, as a forest-C-offset project, could result in additional C storage than without forest and pest management.

The Interaction of the Spruce Budworm, Choristoneura fumiferana (Clem.), and the Parasite Glypta fumiferanae (Vier.)

1960 ◽  
Vol 92 (11) ◽  
pp. 839-850 ◽  
Author(s):  
C. A. Miller
Keyword(s):  
New Brunswick ◽  
Choristoneura Fumiferana ◽  
Adult Emergence ◽  
Spruce Budworm ◽  
Actual Number ◽  
Emergence Period ◽  
Realistic Estimate ◽  
Host Generation

This is the second of a series of papers (Miller, 1959) describing the interaction of primary parasites and the spruce budworm, Choristoneura fumiferana (Clem.), based on data collected during an outbreak of the budworm in northern New Brunswick during the period 1947–1958. The first paper showed that the interaction between the spruce budworm and Apanteles fumiferanae Vier. is adequately described by the general mathematicai model developed by Watt (1959). The data on the parasite Glypta fumiferanae (Vier.) to be presented in this paper are also analysed by means of Watt's model and consequently the method is essentially the same. There is, however, one important difference. In the case of A. fumiferanae, the estimated number of adult parasites was only an index based on the potential number emerging from the previous host generation. The observed density of G. fumiferanae is a more realistic estimate. It is based on the actual number of cocoons found on the foliage during the adult emergence period.

Sign in / Sign up

Export Citation Format

Share Document