scholarly journals The Role of Tree Species, the Herb Layer, and Watershed Characteristics on Nitrogen Cycling in a Central Appalachian Hardwood Forest

2021 ◽  
Author(s):  
Sian E Eisenhut
Keyword(s):  
Nitrogen Cycling ◽  
Tree Species ◽  
Hardwood Forest ◽  
Herb Layer ◽  
Watershed Characteristics

Denning Habits of Common Brushtail Possums, Trichosurus Vulpecula, in New Zealand Lowland Forest.

1989 ◽  
Vol 16 (1) ◽  
pp. 63 ◽  
Author(s):  
PE Cowan
Keyword(s):  
Tree Species ◽  
Bovine Tuberculosis ◽  
Heavy Rain ◽  
Hardwood Forest ◽  
Lowland Forest ◽  
Living Tree ◽  
Large Trees ◽  
Podocarpus Totara ◽  
Autumn And Winter

Fifty-five T. vulpecula were radio-tracked to 182 den sites on 1987 occasions in the podocarp and mixed hardwood forest of the Orongorongo Valley, near Wellington. Most dens (92%) were above ground in trees, particularly in large trees with many clumps of perching epiphytes; the remainder were under fallen logs or trees or in dense tangles of gorse. Melicytus ramiflorus was the most commonly used living tree species. Others used commonly were Knightia excelsa, Elaeocarpus dentatus, Laurelia novaezealandiae [L. novae-zelandiae] and Podocarpus totara. Use was not dictated solely by availability. Trees without perching epiphytes were hardly ever used. Each possum used 11-15 den trees/yr, most only occasionally; the 3 most commonly used den trees accounted for 60-75% of observations. Males used more dens than females, and the sexes differed in their frequencies of the use of the various tree species, though not in the species used. Possums changed dens frequently, on average 2 nights in 3. Den sharing was uncommon, but many dens, including those on the ground, were used sequentially by several (up to 9) different possums. Dens on the ground were used mostly in autumn and winter, by possums in poor condition or after prolonged heavy rain. The implications of den site choice and use by possums are discussed, particularly in relation to den sites as a limiting resource, and the role of dens in the transmission of bovine tuberculosis. There was about a 50% chance that a den would be occupied by different possums within the probable survival period of deposited tuberculosis bacilli.

scholarly journals Co-occurrences of tropical trees in eastern South America: disentangling abiotic and biotic forces

Plant Ecology ◽  
2021 ◽  
Author(s):  
Emma-Liina Marjakangas ◽  
Otso Ovaskainen ◽  
Nerea Abrego ◽  
Vidar Grøtan ◽  
Alexandre A. de Oliveira ◽  
...  
Keyword(s):  
South America ◽  
Tree Species ◽  
Large Scale ◽  
Environmental Filtering ◽  
Limiting Similarity ◽  
Phylogenetic Relatedness ◽  
Biogeographical Regions ◽  
Dependent Processes ◽  
Occurrence Of Species

AbstractSpecies co-occurrences in local communities can arise independent or dependent on species’ niches. However, the role of niche-dependent processes has not been thoroughly deciphered when generalized to biogeographical scales, probably due to combined shortcomings of data and methodology. Here, we explored the influence of environmental filtering and limiting similarity, as well as biogeographical processes that relate to the assembly of species’ communities and co-occurrences. We modelled jointly the occurrences and co-occurrences of 1016 tropical tree species with abundance data from inventories of 574 localities in eastern South America. We estimated species co-occurrences as raw and residual associations with models that excluded and included the environmental effects on the species’ co-occurrences, respectively. Raw associations indicate co-occurrence of species, whereas residual associations indicate co-occurrence of species after accounting for shared responses to environment. Generally, the influence of environmental filtering exceeded that of limiting similarity in shaping species’ co-occurrences. The number of raw associations was generally higher than that of the residual associations due to the shared responses of tree species to the environmental covariates. Contrary to what was expected from assuming limiting similarity, phylogenetic relatedness or functional similarity did not limit tree co-occurrences. The proportions of positive and negative residual associations varied greatly across the study area, and we found a significant tendency of some biogeographical regions having higher proportions of negative associations between them, suggesting that large-scale biogeographical processes limit the establishment of trees and consequently their co-occurrences.

Atlantic Forest recovery after long-term eucalyptus plantations: The role of zoochoric and shade-tolerant tree species on carbon stock

2022 ◽  
Vol 503 ◽  
pp. 119789
Author(s):  
Alex Josélio Pires Coelho ◽  
Pedro Manuel Villa ◽  
Fabio Antônio Ribeiro Matos ◽  
Gustavo Heringer ◽  
Marcelo Leandro Bueno ◽  
...  
Keyword(s):  
Atlantic Forest ◽  
Tree Species ◽  
Carbon Stock ◽  
Forest Recovery ◽  
Eucalyptus Plantations

The Growth of a Tree—A Metaphor for Reflecting on the Role of JRME

2014 ◽  
Vol 45 (4) ◽  
pp. 402-405
Author(s):  
Nerida F. Ellerton
Keyword(s):  
Education Research ◽  
Mathematics Education ◽  
Root System ◽  
Soil Nutrients ◽  
Tree Species ◽  
Natural World ◽  
Mathematics Education Research ◽  
Growth And Survival ◽  
Natural Landscapes

Research journals likeJRMEplay key roles through the publication of peerreviewed research, and it is through such publications that the field has the potential to grow. The metaphor of a growing tree is a useful one to explore in the context of mathematics education research. Growth in the natural world is generally multidimensional. A tree's growth is measured not only in terms of its height but also in terms of the girth of its trunk, the spread of its branches, and the development of a substantial root system, all of which are essential for the tree's continued growth and survival. Soil nutrients need to be replenished, and without sufficient moisture, growth is arrested, and the tree becomes stunted. Many of the most interesting natural landscapes include a range of tree species as well as supporting undergrowth.

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