Taxonomy and distribution of northeast Pacific species of Laminaria

1968 ◽  
Vol 46 (5) ◽  
pp. 539-547 ◽  
Author(s):  
Louis D. Druehl
Keyword(s):  
Habitat Requirements ◽  
Northeast Pacific ◽  
Specific Epithet ◽  
Pacific Species ◽  
Specific Identity

Ten species of Laminaria are recognized for the northeast Pacific: L. groenlandica Rosenv.; L. farlowii Setchell; L. saccharina (L.) Lamour.; L. setchellii Silva; L. dentigera Kjellman; L. longipes Bory; L. sinclairii (Harvey ex Hooker f. et Harvey) Farlow, Anderson et Eaton; L. ephemera Setchell; L. yezoensis Miyabe; and L. complanata (Setchell et Gardner) Setchell. The specific epithet groenlandica is used for those northeast Pacific plants earlier referred to as L. cuneifolia, pending determination of their specific identity. Laminaria personata Setchell and Gardner is suggested to be conspecific with L. yezoensis, L. cordata Dawson is considered conspecific with L. saccharina and L. platymeris De la Pyl. (sensu Setchell and Gardner) is considered conspecific with L. groenlandica. Four forms of L. groenlandica are recognized for the northeast Pacific. These forms are not considered as legitimate taxonomic entities but are distinguished merely to provide a means of facilitating discussion. The known habitat requirements for all 10 species were broadened excepting those of L. complanata and L. sinclairii, and the known distributions of all species, excepting that of L. groenlandica, were extended.

Determination of Habitat Requirements for Apache Trout

2016 ◽  
Vol 146 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Sally J. Petre ◽  
Scott A. Bonar
Keyword(s):  
Habitat Requirements

Habitat requirements of the Charetum intermediae phytocoenoses in lakes of western Poland

Biologia ◽  
2007 ◽  
Vol 62 (6) ◽  
Author(s):  
Maciej Gąbka ◽  
Paweł Owsianny ◽  
Lubomira Burchardt ◽  
Tadeusz Sobczyński
Keyword(s):  
Species Composition ◽  
Humic Substances ◽  
Shallow Lakes ◽  
Habitat Requirements ◽  
Water Parameters ◽  
Trophic Condition ◽  
Habitat Gradients ◽  
Physico Chemical ◽  
Chemical Water

AbstractThe study presents habitat and phytosociological analyses of the Chara intermedia phytocenoses, rare described in Europe. 16 physico-chemical water parameters were analysed, coming from the samples taken in 20 phytocenoses of 13 lakes located in western Poland. The analysed community appeared in naturally shallow lakes representing last stages of the disappearance of glacial water basins. The study attempts to estimate the bioindicative value of the charophyta meadow Charetum intermediae in relation to its habitat. A particular attention has been paid to the determination of the habitat trophic condition, and to the concentration of elements connected with the hardness of water and the content of humic substances. The study shows crucial habitat gradients of the C. intermediae association, taking into account also the species composition of phytocenoses.

scholarly journals Survey of the Illinois Fur Resource

1943 ◽  
Vol 22 (1-7) ◽  
pp. 434-504 ◽  
Author(s):  
Louis G. Brown ◽  
Lee E. Yeager
Keyword(s):  
Habitat Requirements ◽  
Project Report ◽  
Final Project ◽  
Fur Animals ◽  
Calculated Number ◽  
Capital Value

The Illinois wild fur resource was studied intensively in the field from June 1, 1939, to June 30, 1940. This paper, prepared subsequently, is the final project report.  The main objective of the survey was the determination of facts on which to base biologically sound trapping laws and other regulations pertaining to Illinois fur animals. Such facts involved the habitat requirements of the fur animals, the annual yield and income by species and localities, the portion of furs taken by trappers and by hunters, the number of licensed and unlicensed furtakers, methods of trapping, hunting and marketing furs, and fur animal cycles.  In 1938-39, the calculated number of Illinois fur-takers, defined as individuals taking furs by their own efforts, was 29,431; in 1939-40, the total was 27,021. About 9,500 individuals each year took furs by hunting; all other fur-takers were trappers.  The average annual value of the Illinois fur resource in 1938-39 and 1939-40, summarized in tables 15 to 20, inclusive, was over $1,200,000, which represents a capital value of over $30,000,000 at 4 per cent interest.

Determination of Magnetic Polarities of Dredged Basalts: A Limitation of the Method

1975 ◽  
Vol 12 (7) ◽  
pp. 1147-1156
Author(s):  
Sandra M. Barr
Keyword(s):  
Magnetic Anomalies ◽  
Magnetic Polarity ◽  
The Other ◽  
Juan De Fuca Ridge ◽  
Demagnetization Curve ◽  
Northeast Pacific ◽  
Juan De Fuca ◽  
Northeast Pacific Ocean ◽  
Initial Intensity

Magnetic polarity determinations were attempted on 17 unoriented specimens of basalt dredged from 11 locations on Juan de Fuca Ridge and adjacent Heck and Heckle Seamount Chains (Northeast Pacific Ocean). Irving's method involving comparison of NRM and ARM demagnetization curves appears to work consistently only when the NRM has been demagnetized to about 2% or less of its initial intensity and when the ratio of intensity of initial ARM to intensity of residual NRM is high (in the order of 50). For 11 samples meeting these requirements, the polarity determined matches that predicted from the magnetic anomalies in the area of the dredge station. For the other specimens, it is shown that the position of the ARM demagnetization curve was not stabilized under the conditions of the experiments and normally magnetized samples cannot be reliably distinguished from reversed rocks.

scholarly journals Tegulidae and Turbinidae of the northeast Pacific

Zoosymposia ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 70-82
Author(s):  
AXEL ALF
Keyword(s):  
Northeast Pacific ◽  
Pacific Species

The northeast Pacific species of the trochoidean families Tegulidae and Turbinidae are described and illustrated. These two families are discussed and each includes two genera: Tegulidae with the genera Tegula (eight species) and Norrisia (one species), and Turbinidae with the genera Megastrea (two species) and Pomaulax (one species).

Induction of conchospore release: ecotypic variation in northeast Pacific species of Porphyra

2007 ◽  
Vol 20 (3) ◽  
pp. 331-340 ◽  
Author(s):  
Sandra C. Lindstrom ◽  
Jan M. Conitz ◽  
Sharon Hall ◽  
Michael S. Stekoll
Keyword(s):  
Northeast Pacific ◽  
Ecotypic Variation ◽  
Pacific Species
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