Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Animal Sciences (3)
- Forest Sciences (3)
- Physical Sciences and Mathematics (3)
- Environmental Sciences (2)
- Forest Biology (2)
-
- Agricultural and Resource Economics (1)
- Agriculture (1)
- Aquaculture and Fisheries (1)
- Biochemistry (1)
- Biochemistry, Biophysics, and Structural Biology (1)
- Botany (1)
- Entomology (1)
- Forest Management (1)
- Molecular Biology (1)
- Natural Resources and Conservation (1)
- Oceanography (1)
- Oceanography and Atmospheric Sciences and Meteorology (1)
- Plant Sciences (1)
- Poultry or Avian Science (1)
- Social and Behavioral Sciences (1)
- Zoology (1)
- Keyword
-
- American lobster larvae (1)
- Balsam fir (1)
- Black tern Effect of predation on (1)
- Black tern Maine (1)
- Conservation tillage (1)
-
- Environmental policy (1)
- European fire ants (1)
- Forest conservation (1)
- Homarus americanus (1)
- Land use Planning (1)
- Landscape protection (1)
- Leaf Area Index (1)
- Metasequoia; Photomorphogenesis (1)
- Mount Desert Island (1)
- Nerve tissue proteins (1)
- Neural receptors (1)
- Red spruce (1)
- Salamander behavior (1)
- Salamander nests (1)
- Wetland ecology (1)
Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
European Fire Ants On Mount Desert Island, Maine: Population Structure, Mechanisms Of Competition And Community Impacts Of Myrmica Rubra L. (Hymenoptera: Formicidae), Jeffrey Garnas
Electronic Theses and Dissertations
In the early to mid-201h century, Mvrmica rubra Latreille established in various communities in Maine, mostly along the coast. Since its establishment, the ant has spread both locally via vegetative colony budding and regionally via human commerce to no fewer than 30 Maine communities, including one inland site. Studies were undertaken in the summer of 2002 to address questions of the ants' population structure in its introduced range by testing for intercolony aggression within and between local infestations. Using captive nests maintained in their original nest soil, M. rubra was tested against its close neighbors, neighbors of lorn within the …
Environmental Conservation On Agricultural Working Land: Assessing Policy Alternatives Using A Spatially Heterogeneous Land Allocation Model, Kelly M. Cobourn
Environmental Conservation On Agricultural Working Land: Assessing Policy Alternatives Using A Spatially Heterogeneous Land Allocation Model, Kelly M. Cobourn
Electronic Theses and Dissertations
Multifunctionality refers to the ability of agricultural systems to produce an array of non-market goods and services in addition to market commodities. This thesis focuses explicitly on the provision of environmental benefits, through reduced soil erosion and fertilizer applications, by agricultural producers. Soil erosion and nutrient contamination from agricultural production are the foremost contributors to ground and surface water degradation in the United States. Reducing their production implies gains in social welfare, but may generate significant private losses to producers. The objective of this analysis is to quantify the tradeoff between environmental improvements and producer welfare and to examine the …
Wetland And Nest Scale Habitat Use By The Four-Toed Salamander (Hemidactylium Scutatum) In Maine, And A Comparison Of Survey Methods, Rebecca J. Chalmers
Wetland And Nest Scale Habitat Use By The Four-Toed Salamander (Hemidactylium Scutatum) In Maine, And A Comparison Of Survey Methods, Rebecca J. Chalmers
Electronic Theses and Dissertations
Conserving amphibian populations requires knowledge of a species and its habitat relationships. The four-toed salamander (Hemidactylium scutatum) is listed as Special Concern in Maine and 11 additional states and provinces, Threatened in Illinois, and Endangered in Indiana (Appendix A). Little is known of H. scutatum ecology despite the species' extensive range. Infrequent sightings of H. scutatum throughout its range may indicate either low numbers or that the species' behavior make detection difficult. Records for H. scutatum in Maine existed from only 32 sites before my study, and the total number of occurrences of this species in Maine is …
Biology And Ecology Of Larval Lobsters (Homarus Americanus): Implications For Population Connectivity And Larval Transport, Eric R. Annis
Biology And Ecology Of Larval Lobsters (Homarus Americanus): Implications For Population Connectivity And Larval Transport, Eric R. Annis
Electronic Theses and Dissertations
The connectivity of marine populations and the degree to which they are considered open or closed has important implications for the ecology, management, and resilience of commercially harvested species. Larval exchange is a primary determinant of the level of connectivity between populations, and this thesis examines the intrinsic and extrinsic factors influencing larval transport and the distribution of larvae of the American lobster (Homarus americanus). The potential for larval transport is directly proportional to the planktonic larval duration. Our field data suggest development times in situ were up to three times faster than previous laboratory development times, indicating that potential …
Nest Success And Chick Survival Of Black Terns In Maine: Effects Of Predation On Breeding Productivity, Shane R. Heath
Nest Success And Chick Survival Of Black Terns In Maine: Effects Of Predation On Breeding Productivity, Shane R. Heath
Electronic Theses and Dissertations
Nest predation is a prominent cause of reproductive failure in wetland-nesting birds, including black terns. As a result, predator avoidance should play an important role in nest site selection. I examined intraspecific variation in nest success to identify factors affecting nest predation of black tern colonies in central Maine. I measured variables related to proximity of wetland features and nest aggregation for 231 successful and 124 depredated black tern nests during the period 1998-2002. I defined candidate models based on logistic regression and selected models with Akaike's Information Criterion adjusted for small sample sizes (AICc) to determine the …
Nrage Regulates Life And Death Of Neural Progenitors, Stephen E. Kendall
Nrage Regulates Life And Death Of Neural Progenitors, Stephen E. Kendall
Electronic Theses and Dissertations
The development of the central nervous system requires the orchestration of numerous instructive and permissive cues. These factors are secreted from signaling centers and function in a concentration dependent manner that effects the proliferation, survival and differentiation of neural progenitors (NP) and their differentiated progeny. The family including bone morphogenetic proteins (BMPs) are key regulators of NP expansion and survival. However, once NP become committed to a neuronal fate and begin to differentiate they compete for limited amounts of neurotrophin that facilitate further growth and survival. Here we show that the p75 neurotrophin receptor interacting protein NRAGE is expressed in …
Aesthetic Values Of Five Primary Wood Transporting Methods Common To Northern New England, Michael C. Eckley
Aesthetic Values Of Five Primary Wood Transporting Methods Common To Northern New England, Michael C. Eckley
Electronic Theses and Dissertations
Throughout northern New England and across the country, increasing populations and the exurbanization of rural forested landscapes have had a tremendous impact on forest management. As forested areas become more populated, society has become more exposed to the sights and sounds associated with different forest operations. As a result, aesthetics are increasingly driving public reaction to and concern about forestry practices, especially timber harvesting. How people perceive forestry harvesting can be significant in defining the future of forest management, particularly in more populated woodlands. The objective of this study was to better understanding public values as they relate to timber …
Development And Light Response Of Leaves Of Metasequoia And Close Relatives, Xiaochun Li
Development And Light Response Of Leaves Of Metasequoia And Close Relatives, Xiaochun Li
Electronic Theses and Dissertations
Metasequoia glyptostroboides is a useful nearest living relative (NLR) of the Eocene fossil Metasequoia. Research on modern Metasequoia might give us some clues about its fossil counterpart. During this study the leaf anatomy of Metasequoia, Glyptostrobus, Sequoia and Taxodium was investigated with light microscopy and transmission electron microscopy. Metasequoia exhibits several characteristics of typical sciaphilic plants, such as slightly arched outer cell walls in the adaxial epidermal cells, strongly arched outer cell walls in the abaxial epidermal cells, mesophyll composed of spongy cells, chloroplasts with well-developed grana not only in mesophyll cells but in both the adaxial and abaxial epidermis. …
Leaf Area Index - Relative Density Relationships In Even-Aged Abies Balsamea - Picea Rubens Stands In Maine, Robert Justin Derose
Leaf Area Index - Relative Density Relationships In Even-Aged Abies Balsamea - Picea Rubens Stands In Maine, Robert Justin Derose
Electronic Theses and Dissertations
Relationships between leaf area index (LAI) and relative density (RD) were examined in even-aged stands of Abies balsunzen (L.) Mill. and Piceu rubens Sarg. Twelve sites distributed across the Acadian forest in Maine were used to test conformance to three hypothesized models of LA1 over RD: A) constantly increasing LA1 over increasing RD, B) constant LA1 with increasing RD, or C) decreasing LA1 with increasing RD. Multivariate ordination suggested young, precommercially thinned (PCT), high-siteindex (SI) A. balsamea stands should be analyzed separate from older, unspaced (NOPCT), lower-site P. rubens stands. All-sided A. balsamea LAIs ranged from 6.2 - 14.8 over …