Faculty Opinions recommendation of Impacts of neonicotinoid use on long-term population changes in wild bees in England.

2016 ◽  
Author(s):  
Lars Chittka ◽  
Joseph Woodgate
Keyword(s):  
Population Changes ◽  
Wild Bees

scholarly journals Impacts of neonicotinoid use on long-term population changes in wild bees in England

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Ben A. Woodcock ◽  
Nicholas J. B. Isaac ◽  
James M. Bullock ◽  
David B. Roy ◽  
David G. Garthwaite ◽  
...  
Keyword(s):  
Population Changes ◽  
Wild Bees

scholarly journals Carabus Population Response to Drought in Lowland Oak Hornbeam Forest

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3284
Author(s):  
Bernard Šiška ◽  
Mariana Eliašová ◽  
Ján Kollár
Keyword(s):  
Water Balance ◽  
Management Practices ◽  
Activity Patterns ◽  
Meteorological Conditions ◽  
Seasonal Activity ◽  
Population Abundance ◽  
Population Changes ◽  
Pitfall Trapping ◽  
Short And Long Term

Forest management practices and droughts affect the assemblages of carabid species, and these are the most important factors in terms of influencing short- and long-term population changes. During 2017 and 2018, the occurrences and seasonal dynamics of five carabid species (Carabus coriaceus, C. ulrichii, C. violaceus, C. nemoralis and C. scheidleri) in four oak hornbeam forest stands were evaluated using the method of pitfall trapping. The climate water balance values were cumulatively calculated here as cumulative water balance in monthly steps. The cumulative water balance was used to identify the onset and duration of drought. The number of Carabus species individuals was more than three times higher in 2018 than in 2017. Spring activity was influenced by temperature. The extremely warm April in 2018 accelerated spring population dynamics; however, low night temperatures in April in 2017 slowed the spring activity of nocturnal species. Drought negatively influenced population abundance, and the effect of a drought is likely to be expressed with a two-year delay. In our investigation, a drought in 2015 started in May and lasted eight months; however, the drought was not recorded in 2016, and 2016 was evaluated as a humid year. The meteorological conditions in the year influenced seasonal activity patterns and the timings of peaks of abundance for both spring breeding and autumn breeding Carabus species.

scholarly journals Conserving the endemic birds on the Comoro Islands, II: population fluctuations on Ngazidja

1992 ◽  
Vol 2 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Jan Stevens ◽  
Marc Herremans ◽  
Michel Louette
Keyword(s):  
Vegetation Changes ◽  
Population Fluctuations ◽  
Population Changes ◽  
Point Counts ◽  
Shrub Layer ◽  
Forest Exploitation ◽  
Endemic Birds ◽  
Land Bird ◽  
Comoro Islands

SummaryLand bird abundances on Ngazidja, Comoro Islands, obtained by point counts in September 1985 and November–December 1989 are compared. The overall abundance of most species did not differ significantly. Most differences can be interpreted as normal within-year fluctuations. Some important changes are identified and attributed to shortterm vegetation changes: increase of Columba polleni, Coracopsis vasa, Zoonavena grandidieri, Coracina cinerea in Nioumbadjou after abandonment of forest exploitation; decrease of Coracina cinerea at M'Lima Mani North after replacement of the natural shrub layer by bananas. Genuine long-term population changes occur in Coracopsis nigra (increase) and Corvus albus (decrease).

Relative Abundance, Habitat Use, and Long-term Population Changes of Wintering and Resident Landbirds on St. John, U.S. Virgin Islands

2009 ◽  
Vol 121 (1) ◽  
pp. 41-53 ◽  
Author(s):  
David W. Steadman ◽  
Jensen R. Montambault ◽  
Scott K. Robinson ◽  
Sonja N. Oswalt ◽  
Thomas J. Brandeis ◽  
...  
Keyword(s):  
Habitat Use ◽  
Relative Abundance ◽  
Virgin Islands ◽  
Population Changes

scholarly journals Long-term bird population changes in the protected areas of Finland under climate change

2018 ◽  
Author(s):  
Raimo Virkkala ◽  
Ari Rajasärkkä ◽  
Juha Pöyry ◽  
Risto Heikkinen ◽  
Saija Kuusela ◽  
...  
Keyword(s):  
Climate Change ◽  
Protected Areas ◽  
Population Changes ◽  
Bird Population

scholarly journals Long‐term effects of global change on occupancy and flight period of wild bees in Belgium

2020 ◽  
Vol 26 (12) ◽  
pp. 6753-6766
Author(s):  
François Duchenne ◽  
Elisa Thébault ◽  
Denis Michez ◽  
Maxence Gérard ◽  
Céline Devaux ◽  
...  
Keyword(s):  
Global Change ◽  
Flight Period ◽  
Long Term Effects ◽  
Wild Bees

Impact of in-stream restoration structures on salmonid abundance and biomass: an updated meta-analysis

2020 ◽  
Vol 77 (9) ◽  
pp. 1574-1591 ◽  
Author(s):  
Kyleisha J. Foote ◽  
Pascale M. Biron ◽  
James W.A. Grant
Keyword(s):  
Stream Restoration ◽  
Meta Analysis ◽  
Juvenile Fish ◽  
Relative Effectiveness ◽  
Population Changes ◽  
Insufficient Time ◽  
Using Data ◽  
Meta Analyses ◽  
Density And Biomass

Owing to declines in salmonid populations, in-stream restoration structures have been used for over 80 years to increase abundance of fish. However, the relative effectiveness of these structures remains unclear for some species or regions, partly due to contrasting conclusions from two previous meta-analyses. To update and reconcile these previous analyses, we conducted a meta-analysis using data available from 1969 to 2019 to estimate the effect of in-stream structures on salmonid abundance (number and density) and biomass. Data from 100 stream restoration projects showed a significant increase in salmonid abundance (effect size 0.636) and biomass (0.621), consistent with previous reviews and studies, and a stronger effect was found in adults than in juvenile fish. Despite a shift towards using more natural structures (wood and boulders) since the 1990s, structures have not become more effective. However, most projects monitor for less than 5 years, which may be insufficient time in some systems for channel morphology to adjust and population changes to be apparent. Process-based techniques, which give more space for the river, allow more long-term, self-sustaining restoration.

The long-term effect of oil pollution on marine populations, communities and ecosystems: some questions

1982 ◽  
Vol 297 (1087) ◽  
pp. 185-192 ◽  
Keyword(s):  
Population Change ◽  
Oil Pollution ◽  
Community Response ◽  
Population Changes ◽  
Community Adjustment ◽  
Long Term Effect ◽  
Causative Agents ◽  
Response To Stress ◽  
The Individual

An evaluation of the consequences of environmental contamination requires an understanding of the extent to which it is responsible for changes in populations of organisms in the affected area. Population change is not solely related to mortality which may be observed, but depends also on the population dynamics, stock size and survival strategy of the species affected. Population changes affecting species of commercial or sentimental importance or whose diminution is followed by major community adjustment, are regarded more seriously than those of other species. Community adjustment to stress by contaminants may be subtle, difficult to detect and still more so to evaluate. In some instances it is possible to unravel the causative agents, but studies of community response to stress have lagged behind those at lower organizational levels of the individual, tissue or cell. The succeeding papers address questions arising from these considerations.

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