Acorn Production Patterns

2013 ◽  
pp. 181-209 ◽  
Author(s):  
Walter D. Koenig ◽  
Mario Díaz ◽  
Fernando Pulido ◽  
Reyes Alejano ◽  
Elena Beamonte ◽  
...  
Keyword(s):  
Acorn Production

scholarly journals Trade-off between stem growth and acorn production in holm oak

Trees ◽  
2015 ◽  
Vol 29 (3) ◽  
pp. 825-834 ◽  
Author(s):  
Daniel Martín ◽  
Javier Vázquez-Piqué ◽  
Felipe S. Carevic ◽  
Manuel Fernández ◽  
Reyes Alejano
Keyword(s):  
Stem Growth ◽  
Holm Oak ◽  
Acorn Production ◽  
Trade Off

scholarly journals Effects of mistletoe ( Phoradendron villosum ) on California oaks

2018 ◽  
Vol 14 (6) ◽  
pp. 20180240 ◽  
Author(s):  
Walter D. Koenig ◽  
Johannes M. H. Knops ◽  
William J. Carmen ◽  
Mario B. Pesendorfer ◽  
Janis L. Dickinson
Keyword(s):  
Ecosystem Services ◽  
Radial Growth ◽  
Positive Relationship ◽  
Negative Consequences ◽  
Acorn Production ◽  
Growth And Survival ◽  
Significant Positive Relationship ◽  
The Pacific

Mistletoes are a widespread group of plants often considered to be hemiparasitic, having detrimental effects on growth and survival of their hosts. We studied the effects of the Pacific mistletoe, Phoradendron villosum , a member of a largely autotrophic genus, on three species of deciduous California oaks. We found no effects of mistletoe presence on radial growth or survivorship and detected a significant positive relationship between mistletoe and acorn production. This latter result is potentially explained by the tendency of P. villosum to be present on larger trees growing in nitrogen-rich soils or, alternatively, by a preference for healthy, acorn-producing trees by birds that potentially disperse mistletoe. Our results indicate that the negative consequences of Phoradendron presence on their hosts are negligible—this species resembles an epiphyte more than a parasite—and outweighed by the important ecosystem services mistletoe provides.

Estimating acorn crops using visual surveys

1994 ◽  
Vol 24 (10) ◽  
pp. 2105-2112 ◽  
Author(s):  
Walter D. Koenig ◽  
Johannes M.H. Knops ◽  
William J. Carmen ◽  
Mark T. Stanback ◽  
Ronald L. Mumme
Keyword(s):  
High Efficiency ◽  
Sampling Error ◽  
Population Variation ◽  
Conifer Species ◽  
Acorn Production ◽  
Visual Survey ◽  
Annual Productivity ◽  
Level Data ◽  
Survey Technique ◽  
Individual Trees

We describe a visual survey technique for evaluating acorn production. In contrast with previously proposed methods, our technique yields ratio-level data on annual productivity that are analyzable with standard statistics and, by sampling the same trees each year, data on the reproductive patterns of individual trees. We compared this technique with two independent sets of acorn-trap data acquired on oaks of three species at Hastings Reservation in central coastal California. Correlations between acorns counted by the visual surveys and collected from acorn traps under the same trees were significant for all three species. Most scatter in the data appeared to be attributable to three causes: (1) sampling error, especially among trees with very small crops, (2) finite counting speed, leading to a lack of discrimination among trees with very large crops by the visual surveys, and (3) arboreal acorn removal by animals. This latter factor can be particularly large, rendering visual surveys more reliable than the use of traps. Furthermore, only the high efficiency of visual surveys allows for the practical assessment of samples large enough to accommodate high within-population variation and detect widespread geographic variation in acorn production. Visual surveys offer a method of assessing the fruit or cone crops of many hardwood and conifer species that is not only more efficient but also more accurate than the use of traps.

Experimental branch warming alters tall tree leaf phenology and acorn production

2010 ◽  
Vol 150 (7-8) ◽  
pp. 1026-1029 ◽  
Author(s):  
Masahiro Nakamura ◽  
Onno Muller ◽  
Shiori Tayanagi ◽  
Tatsuro Nakaji ◽  
Tsutom Hiura
Keyword(s):  
Leaf Phenology ◽  
Acorn Production ◽  
Tall Tree ◽  
Tree Leaf

Effects of Acorn Production and Mouse Abundance on Abundance and Borrelia burgdorferi Infection Prevalence of Nymphal Ixodes scapularis Ticks

2001 ◽  
Vol 1 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Richard S. Ostfeld ◽  
Eric M. Schauber ◽  
Charles D. Canham ◽  
Felicia Keesing ◽  
Clive G. Jones ◽  
...  
Keyword(s):  
Borrelia Burgdorferi ◽  
Ixodes Scapularis ◽  
Infection Prevalence ◽  
Acorn Production

scholarly journals Influence of pruning and the climatic conditions on acorn production in holm oak (Quercus ilex L.) dehesas in SW Spain

2008 ◽  
Vol 65 (2) ◽  
pp. 209-209 ◽  
Author(s):  
Reyes Alejano ◽  
Raúl Tapias ◽  
Manuel Fernández ◽  
Enrique Torres ◽  
Joaquín Alaejos ◽  
...  
Keyword(s):  
Quercus Ilex ◽  
Climatic Conditions ◽  
Holm Oak ◽  
Acorn Production ◽  
Sw Spain

scholarly journals Fire effects on acorn production are consistent with the stored resource hypothesis for masting behavior

2016 ◽  
Vol 46 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Kyle A. Funk ◽  
Walter D. Koenig ◽  
Johannes M.H. Knops
Keyword(s):  
Seed Production ◽  
Fire Effects ◽  
Internal Dynamics ◽  
Acorn Production ◽  
Wild Tree ◽  
Resource Storage ◽  
Controlled Burns ◽  
Baseline Levels ◽  
Resource Hypothesis

Highly variable patterns of seed production (“masting”) have been hypothesized to be driven by internal dynamics of resource storage and depletion. This hypothesis predicts that if seed production is artificially reduced, then the availability of unused stored resources should result in subsequent enhancement of the seed crop. We tested this prediction in two oak species with contrasting patterns of annual seed production (highly variable and relatively constant) by means of controlled burns at various frequencies over a 17-year period. We found that controlled burns reduced acorn production by both species in the year of the burn. In the species with relatively constant productivity, acorn production returned to baseline levels in the year following a burn; however, in the species with highly variable productivity, acorn production significantly increased the year following a burn. These results support a key prediction of the stored resource hypothesis by means of a long-term experimental test in wild tree populations.

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