Growth and Reproduction of Dwarf Shrubs in a Subarctic Plant Community: Annual Variation and Above-Ground Interactions with Neighbours

1995 ◽  
Vol 83 (2) ◽  
pp. 263 ◽  
Author(s):  
A. Shevtsova ◽  
A. Ojala ◽  
S. Neuvonen ◽  
M. Vieno ◽  
E. Haukioja
Keyword(s):  
Plant Community ◽  
Annual Variation ◽  
Dwarf Shrubs ◽  
Growth And Reproduction

Annual Variation in the Dynamics of a Woodland Plant Community

1979 ◽  
Vol 6 (3) ◽  
pp. 231-236 ◽  
Author(s):  
Michael Treshow ◽  
John Allan
Keyword(s):  
Community Structure ◽  
Environmental Impact ◽  
Plant Community ◽  
Annual Variation ◽  
Air Pollutant ◽  
Environmental Impact Assessments ◽  
Pinyon Pine ◽  
Baseline Conditions ◽  
Utah Juniper ◽  
Plant Components

The dynamics of a Pinyon Pine-Utah Juniper woodlands community were studied to determine the baseline conditions and the annual variation in the major plant components. Understanding the normal baseline community status and its annual variation is paramount to evaluating the possible impact of an air pollutant on the system. Environmental impact assessments rarely concern data from more than one or two years, yet results of the present study show that annual variation is such that data from several years are necessary to establish a valid baseline for community structure.

Temporal dynamics of mycorrhizal fungal communities and co-associations with grassland plant communities following experimental manipulation of rainfall

2019 ◽  
Author(s):  
Coline Deveautour ◽  
Sally Power ◽  
Kirk Barnett ◽  
Raul Ochoa-Hueso ◽  
Suzanne Donn ◽  
...  
Keyword(s):  
Community Composition ◽  
Plant Community ◽  
Plant Communities ◽  
Fungal Community ◽  
Mycorrhizal Fungi ◽  
Temporal Dynamics ◽  
Arbuscular Mycorrhizal ◽  
Fungal Communities ◽  
Plant Responses ◽  
Rainfall Regimes

Climate models project overall a reduction in rainfall amounts and shifts in the timing of rainfall events in mid-latitudes and sub-tropical dry regions, which threatens the productivity and diversity of grasslands. Arbuscular mycorrhizal fungi may help plants to cope with expected changes but may also be impacted by changing rainfall, either via the direct effects of low soil moisture on survival and function or indirectly via changes in the plant community. In an Australian mesic grassland (former pasture) system, we characterised plant and arbuscular mycorrhizal (AM) fungal communities every six months for nearly four years to two altered rainfall regimes: i) ambient, ii) rainfall reduced by 50% relative to ambient over the entire year and iii) total summer rainfall exclusion. Using Illumina sequencing, we assessed the response of AM fungal communities sampled from contrasting rainfall treatments and evaluated whether variation in AM fungal communities was associated with variation in plant community richness and composition. We found that rainfall reduction influenced the fungal communities, with the nature of the response depending on the type of manipulation, but that consistent results were only observed after more than two years of rainfall manipulation. We observed significant co-associations between plant and AM fungal communities on multiple dates. Predictive co-correspondence analyses indicated more support for the hypothesis that fungal community composition influenced plant community composition than vice versa. However, we found no evidence that altered rainfall regimes were leading to distinct co-associations between plants and AM fungi. Overall, our results provide evidence that grassland plant communities are intricately tied to variation in AM fungal communities. However, in this system, plant responses to climate change may not be directly related to impacts of altered rainfall regimes on AM fungal communities. Our study shows that AM fungal communities respond to changes in rainfall but that this effect was not immediate. The AM fungal community may influence the composition of the plant community. However, our results suggest that plant responses to altered rainfall regimes at our site may not be resulting via changes in the AM fungal communities.

Annual variation in the timing of breeding, pre‑breeding foraging areas and corticosterone levels in an Arctic population of black-legged kittiwakes

2014 ◽  
Vol 496 ◽  
pp. 233-247 ◽  
Author(s):  
A Goutte ◽  
F Angelier ◽  
C Bech ◽  
C Clément-Chastel ◽  
G Dell’Omo ◽  
...  
Keyword(s):  
Annual Variation ◽  
Timing Of Breeding

The influences of density on growth and reproduction in moose Alces alces

2000 ◽  
Vol 6 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Steven H. Ferguson ◽  
Alan R. Bisset ◽  
François Messier
Keyword(s):  
Alces Alces ◽  
Growth And Reproduction
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