Search Results

1 - 10 of 38 items :

  • "temporality" x
Clear All
Evaluating Interior Spruce Seed Deployment with GIS-Based Modeling Using British Columbia’s Prince George Seed Planning Zone as a Model

Abstract

The maintenance, protection, and conservation of forest genetic resources for economic, ecological and social benefits are daunting tasks. Understanding how reforestation materials are spatially and temporally deployed across the landscape is an integral component of forest genetic resources management. To improve the current understanding of how reforestation materials are deployed in British Columbia (BC), we developed a geographical information systems (GIS) method to track seed deployment across silviculture openings. Generally, reforestation materials can originate from either natural stand (wild seed collections) or orchards’ seed sources (improved seed); the latter are produced within the framework of specific tree improvement program designed for a particular species within a well-defined seed deployment area, commonly known as Seed Planning Zone (SPZ). In this paper, we present a GIS-based method for evaluating seed deployment patterns for interior spruce (Picea glauca and Picea engelmannii and their natural hybrids) within the Prince George SPZ. The evaluation period (1970-2004) is associated with wild stands and improved seed availability and the dynamic of each seed source proportionate contribution followed three distinct phases; namely, developing (1970-1987), immature (1988-1994), and mature (1995-2004) with a progressive increase of orchards’ seed use over time. The developed method is scalable across SPZs of the same species or multiple species, thus providing the means to: 1) temporally and spatially monitor improved and natural stands seed deployment over the landscape; and 2) identify areas of concerns where a particular seed source is over-represented which might pose an increased genetic vulnerability. The present study revealed that the current interior spruce orchard’s seed use within the Prince George SPZ is expected to exceed the provincial goal of performance target of 75% by 2014. Additionally, areas of excessive use of one seed orchard seed were identified.

Open access
Phytophilous Fauna of a Small and Artificial Urban Lake

Abstract

Phytophilous community on Myriophyllum spicatum was studied in a small artificial urban lake in the city of Osijek (eastern Croatia), during the spring and summer season in 2010. In the eutrophic conditions, macrophyte stands were well developed and in the formed periphyton representatives of the following invertebrate taxa were found: Hydrozoa, Nematoda, Gastropoda, Cladocera, Copepoda, Insecta larvae - including families Chironomidae and Coleoptera. They displayed differences in temporal abundance patterns. Two separate phases in macrophyte colonization with differences in invertebrate composition and abundance were recorded. Insect larvae, particularly Chironomidae, were most abundant in the first phase, through the spring period, and Hydra oligactis (brown hydra) was most abundant in the second phase, i.e. summer period. Concurrently, microcrustacean abundance declined towards the end of the summer. Results of the analyses indicated that water temperature and perihyton biomass were the variables exerting the main influence on the invertebrate assemblage, while interestingly, macrophyte size and biomass were negatively correlated with most of the fauna abundance. On the other hand, brown hydra was negatively correlated with all other invertebrate taxa, except gastropods. Larger surface of submersed macrophytes is the main parameter supporting the increase of invertebrate abundance due to providing protection from predators and growth for periphyton, an important food source for these phytophilous organisms. Macrophyte length was positively correlated with Hydra abundance, while Chironomids were more influenced by periphyton biomass. These organisms can indicate water quality conditions and a potential increase in primary and secondary production.

Open access
Stability of Outcrossing Rates in Eucalyptus globulus Seedlots

-603 (1961) BROOKER, M. I. H.: A new classification of the genus Eucalyptus L’Her. (Myrtaceae). Australian Systematic Botany 13, 79-148 (2000) BROWN, A. H. D., BARRETT, S. C. H. and MORAN, G. F.: Mating system estimation in forest trees: models, methods and meanings. In: ‘Population Genetics in Forestry’. (Ed. H. R. GREGORIUS) pp. 32-49 (Springer-Verlag: New York) (1985) CHELIAK, W. M., DANCIK, B. P., MORGAN, K., YEH, F. C. H. and STROBECK, C.: Temporal variation of the mating system in a natural population of Jack pine

Open access
Genetic Variation Among and Within Populations in Swedish Species of Sorbus aucuparia L. and Prunus padus L. Assessed in a Nursery Trial

(1996): Investigations on altitude-zone growth and ecotypes of rowan (Sorbus aucuparia). Forst und Holz 51 (7): 216-220. KULLMAN, L. (1986): Temporal and spatial aspects of subalpine populations of Sorbus aucuparia in Sweden. Annales Botanici Fennici 23: 267-275. LEVINS, R. (1963): Theory of fitness in a heterogeneous environment. II. Developmental flexibility and niche selection. Am Nat 97 (893): 75-90. MEYER, K. (1997): User Notes for Software DFREML version 3.0a. MORGENSTERN, E. K. (1996): Geographic

Open access
Maintenance of Genetic Structure in Progenies of Marginal Mountainous and Steppe Populations of Three Species of Pinaceae Lindl. Family in Ukraine

characterization of the mating system of Pinus merkusii in Thailand. Forest Genet. 2: 87-97. CHELIAK, W. M., J. A. PITEL and G. MURRAY (1985a): Population structure and mating system of white spruce. Can. J. For. Res. 15: 301-308. CHELIAK, W. M., B. P. DANCIK, K. MORGAN, F. C. H. YEH and C. SRTROBECK (1985b): Temporal variation of the mating system in a natural population of jack pine. Genetics 109: 569-584. DAVIS, B. J. (1964): Disc electrophoresis. II. Method and application to human serum proteins. Ann. N.Y. Acad. Sci. 121: 67

Open access
Variation in Floral Phenological Synchronization in a Clonal Seed Orchard of Pinus tabuliformis in Northeast of China

References ALIZOTI, P. G., K. KILIMIS and P. GALLIONS (2010): Temporal and spatial variation of flowering among Pinus nigra Arn. clones under changing climatic conditions. Forest Ecology and Management 259: 786-797. ASKEW, G. R. (1985): Quantifying uniformity of gamete production in seed orchard. Silvae Genetica 34 (4-5): 186-188. ASKEW, G. R. (1988): Estimation of gamete pool compositions in clonal seed orchards. Silvae Genetica 37 (5-6): 227-232. ASKEW, G. R. and D. BLUSH (1990): Short note

Open access
Spring and autumn phenology of Bulgarian and German provenances of Common beech (Fagus sylvatica L.) under similar climatic conditions

: 864-874. https://doi.org/10.1016/j.foreco.2010.06.005 Chmura DJ, Rozkowski R (2002): Variability of Beech Provenances in Spring and Autumn Phenology, Silvae Genetica 51:123-127. Čufar K, De Luis M, Angel Saz M, Črepinšek Z, Kajfež-Bogataj L (2012) Temporal shifts in leaf phenology of beech (Fagus sylvatica) depend on elevation, Trees-Structure and Function , 26:, 1091-1100. https://doi.org/10.1007/s00468-012-0686-7 Dobbertin M (2005) Tree growth as indicator of tree vitality and of tree reaction to environmental

Open access
Faster Evaluation of Induced Floral Sterilit

Seasonal Flowering. Plant Cell. 18: 1-16. HUANG, T., H. BOLENIUS, S. ERIKSSON, F. PARCY and O. NILSSON (2005): The mRNA of the Arabidopsis gene FT moves from leaf to shoot apex and induces flowering. Science 309: 1694-6. KOLTUNOW, A. M, J. TRUETTNER, K. H. COX, M. WALLROTH and R. B. GOLDBERG (1990): Different Temporal and Spatial Gene Expression Patterns Occur during Anther Development. Plant Cell. 2: 1201-1224. KUMAR, S. and M. FLADUNG (2001): Gene stability in transgenic aspen (Populus). II. Molecular characterization of

Open access
Genetic heterogeneity in age classes of naturally regenerated old growth forest of Picea abies (L.) Karst

205 (1): 19-31. CHEN, X.Y. and Y. C. SONG (1997): Temporal genetic structure of a Cyclobalanopsis glauca population in Huangshan. J East China Normal Univ (Nat Sci) (4): 79-84. CHUNG, M.Y., B. K. EPPERSON and M. G. CHUNG (2003): Genetic structure of age classes in Camellia japonica (Theaceae). Evolution 57 (1): 62-73. ECHT, C. S., L. L. DEVERNO, M. ANZIDEI and G. G. VENDRAMIN (1998): Chloroplast microsatellites reveal population genetic diversity in red pine, Pinus resionsa, Ait. Mol Ecol 7: 307

Open access
Chloroplast DNA Variation of Carapa guianensis in the Amazon basin

References ABSY, M. L., A. CLEEF, M. FOURNIER, L. MARTIN, M. H., A. Sifeddine, M. F. DA SILVA, F. SOUBIES, K. SUGUIO, B. TURCQ and T. VAN DER HAMMEN (1991): Occurrence of 4 episodes of rain-forest regression in Southeastern Amazonia during the last 60,000 YRS - 1st comparison with other tropical regions. Comptes Rendus de l’Académie des Sciences Série II 312: 673-678. CARON, H., S. DUMAS, G. MARQUE, C. MESSIER, E. BANDOU, R. J. PETIT and A. KREMER (2000): Spatial and temporal distribution of chloroplast DNA polymorphism in a

Open access