Some aspects of the vegetation ecology of the Nanoose–Bonell estuary, Vancouver Island, British Columbia

1986 ◽  
Vol 64 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Neil K. Dawe ◽  
Eric R. White
Keyword(s):  
British Columbia ◽  
Vascular Plants ◽  
Dry Weight ◽  
Vancouver Island ◽  
Distichlis Spicata ◽  
Factors Affecting ◽  
Salicornia Virginica ◽  
Major Factors ◽  
Triglochin Maritimum ◽  
Water Elevation

A study of the vegetation of the Nanoose – Bonell salt marsh, Vancouver Island, British Columbia, was conducted during the period of May – September 1978. A total of 49 species of vascular plants was identified, 10 of which dominated the flora of the estuarine marsh. Six of those dominant species (Distichlis spicata, Glaux maritima, Salicornia virginica, Triglochin maritimum, Plantago maritima, and Atriplex patula) are tolerant of high salinities. Eight plant communities were identified and mapped within the study area. Aerial biomass was dominated by that of the Carex – channel edge community with a peak aboveground biomass of 1259 g dry weight/m2. Major factors affecting the occurrence and distribution of species within the marsh were salinity of the inundating water, elevation of the marsh platform, and soil texture.

Some aspects of the vegetation ecology of the Little Qualicum River estuary, British Columbia

1982 ◽  
Vol 60 (8) ◽  
pp. 1447-1460 ◽  
Author(s):  
Neil K. Dawe ◽  
Eric R. White
Keyword(s):  
Plant Communities ◽  
Soil Type ◽  
Vascular Plants ◽  
Vascular Plant ◽  
River Estuary ◽  
Dry Weight ◽  
Factors Affecting ◽  
Juncus Balticus ◽  
Major Factors ◽  
Channel Edge

Nine vascular plant communities were determined and mapped from data gathered on the Little Qualicum River estuary, Vancouver Island, B.C., during the period May to September 1978. Those communities comprised 51 species of vascular plants; however, only 10 species occurred with constancies of 20% or greater. Carex lyngbyei, Potentilla pacifica, Juncus balticus, and Agrostis sp. dominated vegetation. Major factors affecting the distribution of the vegetation within the estuary appeared to be site elevation, soil type and texture, and inundating water salinity. Aerial production was dominated by that of the Carex – channel edge community which had a peak aboveground biomass of 1693 g dry weight∙m−2.

Factors affecting the early growth of Leucaena leucocephala

1997 ◽  
Vol 37 (1) ◽  
pp. 27 ◽  
Author(s):  
N.J Brandon ◽  
H.M Shelton
Keyword(s):  
Arbuscular Mycorrhiza ◽  
Plant Height ◽  
Leucaena Leucocephala ◽  
Field Experiments ◽  
Dry Weight ◽  
Early Growth ◽  
The Other ◽  
Factors Affecting ◽  
Height Increase ◽  
Major Factors

Summary. Slow establishment has been identified as a major limitation to the more widespread adoption of the fodder tree Leucaena leucocephala in Queensland. Field experiments were conducted at Mt Cotton, Gayndah and Theodore in south-east Queensland during the 1987–88 summer to identify the major factors limiting first year yield of leucaena. Treatments at each site included irrigation (applied at sowing only, or at intervals throughout the trial), and rates of phosphorus (P), nitrogen (N) and lime. Attack by psyllid insects, weed competition and defoliation by wildlife were noted and minimised where possible. Soil moisture appeared to be the major limitation to plant growth at the inland sites of Theodore and Gayndah where post-establishment irrigation increased final dry weight by 250%. Waterlogging reduced plant height increase at the low lying Mt Cotton site following higher than normal rainfall. Increase in plant height at the other sites stopped when night temperatures fell below 15°C. Application of P at 75–1200 kg/ha tripled final dry weight of leucaena at Mt Cotton (5 mg/kg bicarbonate-extractable P) but had no effect at Theodore (10 mg P/kg) or Gayndah (35 mg P/kg). Larger than normal responses to P during early growth may be due to slow colonisation of the roots by arbuscular mycorrhiza. Application of N (200 kg N/ha) increased dry weight of Rhizobium-inoculated leucaena by 27% at Theodore but had little or no effect at the other sites. Application of lime had no significant effects on plant height or dry weight of leucaena at Mt Cotton despite the soil being slightly acidic (pH 5.9 in 1 : 5 H2 O suspension). Further work on the role of colonisation by arbuscular mycorrhiza fungi in determining uptake of P by leucaena is warranted in view of the large response to very high rates of P in young seedlings at Mt Cotton.

The Early Cretaceous Apple Bay flora of Vancouver Island: a hotspot of fossil bryophyte diversity

Botany ◽  
2016 ◽  
Vol 94 (9) ◽  
pp. 683-695 ◽  
Author(s):  
Alexandru M.F. Tomescu
Keyword(s):  
British Columbia ◽  
Early Cretaceous ◽  
Fossil Record ◽  
Vascular Plants ◽  
Vancouver Island ◽  
Significant Fraction ◽  
Plant Fossil ◽  
Rock Record ◽  
Preservation Potential ◽  
Better Than

The pre-Cenozoic bryophyte fossil record is significantly sparser than that of vascular plants or Cenozoic bryophytes. This situation has been traditionally attributed to a hypothesized low preservation potential of the plants. However, instances of excellent pre-Cenozoic bryophyte preservation and the results of experiments simulating fossilization contradict this traditional interpretation, suggesting that bryophytes have good preservation potential. Studies of an anatomically preserved Early Cretaceous (Valanginian) plant fossil assemblage on Vancouver Island (British Columbia), at Apple Bay, focusing on the cryptogamic flora, have revealed an abundant bryophyte component. The Apple Bay flora hosts one of the most diverse bryophyte assemblages worldwide, with at least nine distinct moss types (polytrichaceous, leucobryaceous, tricostate), one complex thalloid liverwort, and two other thalloid plants (representing bryophyte or pteridophyte gametophytes), which contribute a significant fraction of biodiversity to the pre-Cenozoic fossil record of bryophytes. These results (i) corroborate previous observations and studies, indicating that the preservation potential of bryophytes is much better than traditionally thought; (ii) indicate that the bryophyte fossil record is incompletely explored and many more bryophyte fossils are hidden in the rock record, awaiting discovery; and (iii) suggest that the paucity of the pre-Cenozoic bryophyte fossil record is primarily a reflection of inadequate paleobryological capacity.

Notes on some parasitic fungi from southern British Columbia, southwest Alberta, and adjacent United States

1976 ◽  
Vol 54 (9) ◽  
pp. 971-975 ◽  
Author(s):  
D. B.O. Savile
Keyword(s):  
United States ◽  
British Columbia ◽  
Vancouver Island ◽  
Type Locality ◽  
Distichlis Spicata ◽  
New Host ◽  
Parasitic Fungi

New host and geographic records are given for various fungi. The following are included: Uromyces peckianus ssp. verruculosus ssp. nov. on Distichlis spicata. Vancouver Island; Exobasidium phyllodoces comb. nov. on Phylloduce empetriformis, B.C. and Wash.; Puccinia phaceliae, new host and geographic records for B.C., Alta., Wash.; and P. ornatula on Viola glabella, Olympic Mts., Wash. Rediscovery of P. ornatula at Glacier, B.C.. elucidates its ecology. Puccinia praegracilis var. praegracilis has been rediscovered at the type locality.

The plainfin midshipman’s soundscape at two sites around Vancouver Island, British Columbia

2018 ◽  
Vol 603 ◽  
pp. 189-200 ◽  
Author(s):  
WD Halliday ◽  
MK Pine ◽  
APH Bose ◽  
S Balshine ◽  
F Juanes
Keyword(s):  
British Columbia ◽  
Vancouver Island

scholarly journals Relationship between Land Use Mix and Walking Choice in High-Density Cities: A Review of Walking in Seoul, South Korea

2021 ◽  
Vol 13 (2) ◽  
pp. 810
Author(s):  
Eun Yeong Seong ◽  
Nam Hwi Lee ◽  
Chang Gyu Choi
Keyword(s):  
Land Use ◽  
Neighborhood Environment ◽  
Single Family ◽  
Housing Type ◽  
General Belief ◽  
Factors Affecting ◽  
Land Use Mix ◽  
Family Housing ◽  
Mixed Land Use ◽  
Major Factors

This study confirmed the general belief of urban planners that mixed land use promotes walking in Seoul, a metropolis in East Asia, by analyzing the effect of mixed land use on the travel mode choice of housewives and unemployed people who make non-commuting trips on weekdays. Using binomial logistic regression of commuting data, it was found that the more mixed a neighborhood environment’s uses are, the more the pedestrians prefer to walk rather than drive. The nonlinear relationship between the land use mix index and the choice to walk was also confirmed. Although mixed land use in neighborhoods increased the probability of residents choosing walking over using cars, when the degree of complexity increased above a certain level, the opposite effect was observed. As the density of commercial areas increased, the probability of selecting walking increased. In addition to locational characteristics, income and housing type were also major factors affecting the choice to walk; i.e., when the residents’ neighborhood environment was controlled for higher income and living in an apartment rather than multi-family or single-family housing, they were more likely to choose driving over walking.

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