Frego Bract Condition of Cotton in Relation to Insect Populations 1

1972 ◽  
Vol 1 (3) ◽  
pp. 390-391 ◽  
Author(s):  
Thomas F. Leigh ◽  
Angus H. Hyer ◽  
Richard E. Rice
Keyword(s):  
Insect Populations

scholarly journals Floral Plantings in Large-Scale Commercial Agroecosystems Support Both Pollinators and Arthropod Predators

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 91
Author(s):  
Eric G. Middleton ◽  
Ian V. MacRae ◽  
Christopher R. Philips
Keyword(s):  
Large Scale ◽  
Agricultural Land ◽  
Field Margins ◽  
Crop Fields ◽  
Pollinator Abundance ◽  
Arthropod Predators ◽  
Commercial Potato ◽  
Insect Populations ◽  
Beneficial Insect ◽  
Potato Crops

Beneficial insect populations and the services that they provide are in decline, largely due to agricultural land use and practices. Establishing perennial floral plantings in the unused margins of crop fields can help conserve beneficial pollinators and predators in commercial agroecosystems. We assessed the impacts of floral plantings on both pollinators and arthropod predators when established adjacent to conventionally managed commercial potato fields. Floral plantings significantly increased the abundance of pollinators within floral margins compared with unmanaged margins. Increased floral cover within margins led to significantly greater pollinator abundance as well. The overall abundance of arthropod predators was also significantly increased in floral plantings, although it was unrelated to the amount of floral cover. Within adjacent potato crops, the presence of floral plantings in field margins had no effect on the abundance of pollinators or predators, although higher floral cover in margins did marginally increase in-crop pollinator abundance. Establishing floral plantings of this kind on a large scale in commercial agroecosystems can help conserve both pollinators and predators, but may not increase ecosystem services in nearby crops.

scholarly journals Global change in marine coastal habitats impacts insect populations and communities

2021 ◽  
Vol 47 ◽  
pp. 1-6
Author(s):  
Tyler M Rippel ◽  
Jewel Tomasula ◽  
Shannon M Murphy ◽  
Gina M Wimp
Keyword(s):  
Global Change ◽  
Coastal Habitats ◽  
Insect Populations

Effects of bird predation on some pest insect populations in corn

2001 ◽  
Vol 83 (1-2) ◽  
pp. 143-152 ◽  
Author(s):  
A Tremblay ◽  
P Mineau ◽  
R.K Stewart
Keyword(s):  
Bird Predation ◽  
Pest Insect ◽  
Insect Populations

Phenotypic differences among wild passerine nestlings in relation to early-life rearing environment

2021 ◽  
Author(s):  
Jesús Gómez ◽  
Christy Morrissey ◽  
Sonia Cabezas ◽  
Tracy Marchant ◽  
Robert Clark
Keyword(s):  
Land Use ◽  
Body Condition ◽  
Early Life ◽  
Agricultural Land ◽  
Developmental Stages ◽  
Tree Swallow ◽  
Phenotypic Differences ◽  
Aerial Insectivore ◽  
Fledgling Survival ◽  
Insect Populations

Subtle changes in stress physiology during critical developmental stages have been linked to long-term fitness; however, the biological processes and phenotypic responses to early-life rearing environments such as anthropogenic land use conditions, have not been fully evaluated in insectivorous birds. We manipulated Tree Swallow, Tachycineta bicolor (Vieillot, 1808), brood sizes at sites with contrasting agricultural land use to assess phenotypic changes in body condition and genetic and physiological biomarkers of stress during the sensitive nestling growth phase. We predicted that nestling swallows raised on cropland-dominated sites, especially those in enlarged broods, would have lower body condition, shorter telomeres, and higher feather corticosterone than nestlings raised in smaller broods at grassland sites. Body condition was highest among nestlings raised in reduced broods but was unrelated to land use. Telomere lengths tended to be shorter in nestlings from enlarged broods and at cropland sites. Corticosterone was not related to any factor. Locally-abundant insect populations associated with wetlands may have dampened the effects and/or parent swallows assumed higher costs of reproduction rather than passing these costs to nestlings. Results suggest that food stress could reduce fledgling survival via telomere shortening; a hypothesis that requires further investigation due to its potential importance to population viability in multiple declining aerial insectivore species.

Response of specialist and generalist predators to nonprogressive annual fluctuations in herbivorous insect populations

2021 ◽  
pp. 104810
Author(s):  
Toru Taniwaki ◽  
Kyohei Watanabe ◽  
Hirotaka Komine ◽  
Kahoko Tochigi ◽  
Masanobu Yamane ◽  
...  
Keyword(s):  
Generalist Predators ◽  
Herbivorous Insect ◽  
Insect Populations

Multiple-cohort Approach for Simulating Development of Insect Populations under Variable Temperatures

1985 ◽  
Vol 78 (6) ◽  
pp. 691-704 ◽  
Author(s):  
Terence L. Wagner ◽  
Hsin-I Wu ◽  
Richard M. Feldman ◽  
Peter J. H. Sharpe ◽  
Robert N. Coulson
Keyword(s):  
Insect Populations

Monitor surveying for migrant insect pests

1973 ◽  
Vol 7 (3) ◽  
pp. 109-116 ◽  
Author(s):  
L R Taylor
Keyword(s):  
Population Dynamics ◽  
Insect Pests ◽  
Spatial Dimension ◽  
Effective Control ◽  
Crop Pests ◽  
Insect Populations ◽  
Insect Survey ◽  
Local Assessment

Effective control of erratic crop pests requires accurate timing of treatments, and the dynamics of insect populations are inadequately understood. Aerial monitoring for many species simultaneously, instead of sampling each crop separately, enables the Rothamsted Insect Survey to provide accurate, quantitative, synoptic information on current levels of pest populations; this gives continuity to local assessment for advisory purposes, and adds a spatial dimension to population dynamics.

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