Preliminary studies in the taxonomy of Danthonia in Canada

1973 ◽  
Vol 51 (2) ◽  
pp. 437-450 ◽  
Author(s):  
B. R. Baum ◽  
Judy N. Findlay
Keyword(s):  
Canonical Analysis ◽  
Herbarium Material ◽  
Geographical Factor ◽  
Canonical Analyses

Representative Canadian herbarium material of Danthonia was studied morphologically and micromorphologically. Characters used by previous authors were reexamined. Among the new characters studied the lodicule patterns were found to be very useful for discrimination. Canonical analyses were performed excluding input of lodicule patterns, but with the incorporation of various other lodicule attributes. As a result, five species are recognized for Canada; a key and a map of distribution are given. An additional canonical analysis with the inclusion of latitude and longitude added as input has shown that the geographical factor is insignificant.

Contribution to the flora of marine algae of the coastal zone of the northeastern part of the Sea of Okhotsk

2018 ◽  
Vol 52 (1) ◽  
pp. 63-73
Author(s):  
N. V. Evseeva
Keyword(s):  
Coastal Zone ◽  
Sea Of Okhotsk ◽  
Marine Algae ◽  
Herbarium Material ◽  
Northeastern Part ◽  
The Sea Of Okhotsk ◽  
The Family ◽  
First Time

The revision of the herbarium material, collected in the northern part of the Sea of Okhotsk in 1965–1966 and stored in VNIRO, allowed to expand the taxonomic list of macrophyte algae of the coastal zone of this area. The locations of discovery of 24 previously unmentioned species are described. Myrionema balticum, Ulvella repens, Syncoryne reinkei, Acrochaetium arcuatum were found in the Sea of Okhotsk for the first time. Most species new for the Sea of Okhotsk is represented by epiphytes of the family Ulvellaceae (Chlorophyta). The final taxonomic list of this region, including literature data, consists of 169 species.

Revision of the Phyllachoraceae (Ascomycota) on hosts in the angiosperm family, Proteaceae

2001 ◽  
Vol 14 (2) ◽  
pp. 283 ◽  
Author(s):  
Ceridwen A. Pearce ◽  
Paul Reddell ◽  
Kevin D. Hyde
Keyword(s):  
Literature Review ◽  
South America ◽  
Herbarium Material

A literature review yielded seven Australian taxa within the Phyllachoraceae recorded from hosts in the angiosperm family Proteaceae, with three taxa from overseas. New collections and herbarium material were examined by using traditional microscopic characters. Seven new Australian taxa were identified. These include Phyllachora banksiae subsp. westaustraliensis on Banksia speciosa, Phyllachora tjapukiensis on Darlingia darlingiana, Phyllachora kylei on Dryandra spp., Phyllachora amplexicaulii on Hakea amplexicaulis, Phyllachora grevilleae subsp. clelandii on Hakea clavata and H. vittata, Phyllachora hakeicola subsp. cuttacuttae on Hakea arborescens and Phyllachora hakeicola subsp. tasmaniensis on Hakea lissosperma. We now recognise nine species, four subspecies and one variety within the Phyllachoraceae on Proteaceae in Australia, and Phyllachora rhopalina var. rhopalina and P. rhopalina var. macrospora from South America. In this paper, these taxa are described and illustrated by using interference contrast micrographs. A key to all known species of Phyllachoraceae on hosts in the Proteaceae is provided.

Functional Canonical Analysis Between Functional and Interval Data

2009 ◽  
Author(s):  
Yow-Jen Jou ◽  
Chien-Chia Huang ◽  
Jennifer Yuh-Jen Wu ◽  
George Maroulis ◽  
Theodore E. Simos
Keyword(s):  
Interval Data ◽  
Canonical Analysis

Variation in climate determines differences in the effects of abiotic variables on the phytoplankton community in tropical ecosystems

2018 ◽  
Vol 69 (3) ◽  
pp. 357
Author(s):  
F. H. Portella Corrêa de Oliveira ◽  
A. N. Moura ◽  
Ê. W. Dantas
Keyword(s):  
Phytoplankton Community ◽  
Synergistic Effects ◽  
Climatic Conditions ◽  
Cylindrospermopsis Raciborskii ◽  
Tropical Reservoirs ◽  
Physicochemical Variables ◽  
Abiotic Variables ◽  
Tropical Climates ◽  
Semi Arid ◽  
Canonical Analyses

The present study demonstrates the effects of abiotic variables on phytoplankton in two different tropical climates. Samples were taken from tropical reservoirs, including six from a tropical climate (As) and five from a semi-arid climate (BSh). Phytoplankton samples were identified, biomass was quantified and climatic and physicochemical variables were evaluated. Canonical analyses were performed in order to observe the effects of abiotic variables on phytoplankton. In both As and BSh ecosystems, the effects of the physicochemical variables were significant, but the synergistic effects between variables and climatic conditions were more pronounced in BSh. Micronutrients had a significant role in structuring the phytoplankton community in both As and BSh. In As, Cylindrospermopsis raciborskii occurred in the presence of lower concentrations of zinc and copper, whereas in BSh this species was present in the presence of higher concentrations of zinc. In the As climate, Geitlerinema amphibium, Cyclotella meneghiniana, Planktothrix agardhii and Microcystis aeruginosa were associated with higher sodium concentrations in the water, whereas in the BSh climate these species experienced lower rainfall. The findings of the present study show that climate determines the effects of abiotic variables on the phytoplankton community in both an independent and synergistic manner. In the present study, phytoplankton in tropical and semi-arid reservoirs is mostly regulated by nutrients, the effects of which vary according to climate.

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