Our previous knowledge of mosses in California largely concerns their taxonomy. Ecology and geography have received little attention probably because the moss flora has long needed a critical re-examination. The author undertook a revision of the Californian mosses, with Grout's (1928-1940) Moss flora of North America north of Mexico as a basis, before analyzing their distribution. Three preliminary papers (Koch, 1948, 1949a, 1949b) and an annotated list of 317 species for the state (Koch, 1950a) are the result of that research. Since then, three additional species (Koch, 1950b, 1951a) have been added to the known flora of California, bringing the total to 320 mosses. Very recently two new species, Fissidens milobakeri Koch and Tortula stanfordensis Steere have been described from California material (Koch, 1951c; Steere, 1951), but these are not incorporated in this paper. The present paper embodies a classification of the patterns of known distribution of mosses in California, a comparison of these patterns with the units of vegetational areas previously proposed for California, and finally an analysis of world-wide distribution of California mosses based upon a proposed system of plant geography.

Distribution of Californian Mosses

approved: Signature redacted for privacy. Helge Irgens-Moller Rates of apparent net photosynthesis were measured on a sample of Rocky Mountain Douglas-fir consisting of eleven one-year-old seedlings from each of the thirteen different seed sources. Secondary observations of needle length, needle weight, and needle number were also obtained. A formula derived through step-wise multiple regression of the secondary observations on the rate of photosynthesis controlled 87 of the variation. The significance of the regression formula indicated the importance of the process of mutual shading. Analysis of variance of the un-adjusted rates of photosynthesis was significant between and within seed sources. After adjustment only seed source differences were significant. Analysis of variance of the regression formula was significant between and within seed sources. By the process of contrasting sums of squares, climatic AN ABSTRACT OF THE THESIS OF WALTER WILLIAM POPE for the MASTER OF SCIENCE (Name) (Degree) in Forest Management presented on (Major) (Date) Title: GEOGRAPHICAL VARIATION IN APPARENT NET PHOTOSYNTHESIS OF ROCKY MOUNTAIN DOUGLASFIR, PSEUDOTSUGA MENZIESII VAR. GLAUCA factors at the origin of the seed sources were found significantly to effect only the morphological factors. Therefore adaptation of the photosynthetic process by morphology to an environment is probable. The importance of this study is that the processes used to determine the adjusted rate of photosynthesis enable a better estimate of the apparent net photosynthesis than has been possible before with Douglas-fir. Geographical Variation in Apparent Net Photosynthesis of Rocky Mountain Douglas-fir, Pseudotsuga menziesii var. glauca by Walter William Pope A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science June 1973

/pdf/geographical-variation-in-apparent-net-photo-synthesis-of-3pugjjj5uw.pdf

Geographical variation in apparent net photo-synthesis of Rocky Mountain Douglas-fir, Pseudotsuga menziesii var. glauca

Ecology has been defined as the science of communities (Shelford 1930). Some biologists believe it is more a point of view than it is a separate science. In either case, the study of ecology is a broad over-view of the interrelationships of living things with each other and with their external surroundings. The writer has shown in the pages of this journal (Dexter 1945) how the science of ecology forms the very hub of the pure and applied natural sciences. Being so comprehensive in character, embracing the cause and effect relations of natural processes of the living world, it is a hub of many facets. The modern science ecology first developed as plant ecology under the direction of botanists who became interested in the study of plants living in their natural habitats (Warming 1909). Zoologists soon followed the lead and founded the modern study of animal ecology (Adams 1913), first adopting the general methods of the plant ecologists and later introducing techniques for the specialized study of animal populations. The two main pillars of ecology have remained as separate compartments of study (Weaver and Clements 1938, Pearse 1939) to the present day for the reason that most students of the life sciences are either botanists or zoologists with specialized interests. In recent years an attempt has been made to synthesize the plant and animal aspects of ecology into a unified science of bioecology (Clements and Shelford 1939). The name bio-ecology might seem redundant, but it serves the purpose of emphasizing the unified character of the science. Biologists in general have not yet developed the concept of ecology as a unit, but rather think of it in terms of the sister sciences of plant and animal ecology. Of course, there is still a place and a need for the development of each as a separate field in the prosecution of specialized research, although it is most desirable to further research and study along lines which integrate the relations of plants and animals living in a common group. The study of externial relationships of a single species or a restricted taxonomic group is autecology. This may take the form of such studies as the ecological relations of the burroweed (Humphrey 1937), of the field mouse (Hamilton 1937), as insect ecology (Balduf 1935), or bird ecology (Twomey 1945). In some cases, a portion of an organism may be studied with respect to its environment, in such a specialized science as root ecology (Nedrow 1937). When the whole mass of vegetation or the entire animal population form the basis of the problem, the science is labelled synecology. Examples here may be drawn from such works as the survey of animal conmunities of a particular region (Shelford 1937) or the vegetation of a certain locality (Braun 1942). In its broadest sense, synecology becomes synonomous with bio-ecology (also called general ecology and bionomics). A community study may be made on a large scale, covering an extensive area with a diversity of ecological situations (Davis 1943), or it may involve the inhabitants of micro-habitats, such as treeholes (Lackey 1940). In the final analysis, a com-

Facets of Ecology

Effect of DDT on Cone Production, Germination, and Seedling Survival in the Boreal Forest

Melanism in white-tailed deer in central texas

Foundations of plant geography

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Foundations of plant geography

Chat with Paper

AI Agents for this Paper

Citations

Distribution of Californian Mosses

Geographical variation in apparent net photo-synthesis of Rocky Mountain Douglas-fir, Pseudotsuga menziesii var. glauca

Facets of Ecology

Effect of DDT on Cone Production, Germination, and Seedling Survival in the Boreal Forest

Melanism in white-tailed deer in central texas

Related Papers (5)

Variation and Evolution in Plants

The geography of the flowering plants

Gray's Manual of Botany.

The Theory of Island Biogeography

Vegetation of the Great Smoky Mountains