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Articles 31 - 41 of 41
Full-Text Articles in Population Biology
The American Lobster Settlement Index: An Early Warning System?, Maine Sea Grant College Program
The American Lobster Settlement Index: An Early Warning System?, Maine Sea Grant College Program
Maine Sea Grant Publications
The harvest of American lobsters is the Gulf of Maine’s largest, most valuable, and most iconic fishery. The catch has never been higher, but how long will it last? Fishing communities in eastern Maine and southern Nova Scotia are seeing historically high landings, some five times higher than the 1980s. At the same time, the lobster fishery south of Cape Cod has all but collapsed, plagued by shell disease and stressfully warm summers. It has never been more important to monitor this vital fishery. The American Lobster Settlement Index measures the annual pulse of baby lobsters to rocky nurseries some …
Spatial And Habitat Responses Of Canada Lynx In Maine To A Decline In Snowshoe Hare Density, David G. Mallett
Spatial And Habitat Responses Of Canada Lynx In Maine To A Decline In Snowshoe Hare Density, David G. Mallett
Electronic Theses and Dissertations
Previous studies of Canada lynx (Lynx canadensis) within the northern boreal forest region have documented that lynx respond spatially to a decline in snowshoe hare (Lepus americanus) density, as exhibited by expansion of territories and changes in social structure. I compared home range area and spatial overlap in the southeastern portion of their geographic range during periods of relatively high and relatively low hare density. Home range areas of lynx did not change between periods of high and low hare density, except that home ranges of females during the denning season expanded during the low period. The presence of kittens …
Application Of Spatial Modeling Tools To Predict Native Bee Abundance In Maine's Lowbush Blueberries, Shannon J. Chapin
Application Of Spatial Modeling Tools To Predict Native Bee Abundance In Maine's Lowbush Blueberries, Shannon J. Chapin
Electronic Theses and Dissertations
Non-native honeybees historically have been used to pollinate many crops throughout the United States, however, recent population declines have revealed the need for a more sustainable pollination plan. Native bees are a natural resource that can play an important role in pollination. I used spatial modeling tools to evaluate relationships between landscape factors and native bee abundance, with a focus on the wild native bees that pollinate Maine’s lowbush blueberries. I applied the InVEST Crop Pollination ecosystem spatial modeling tool, which predicts pollinator abundance based on available floral resources and nesting habitat, to the Downeast Maine region. The InVEST model …
Collaborative Research: Land-Use Practices And Persistence Of Amphibian Populations, Malcolm L. Hunter Jr.
Collaborative Research: Land-Use Practices And Persistence Of Amphibian Populations, Malcolm L. Hunter Jr.
University of Maine Office of Research Administration: Grant Reports
Over the past 200 years, conversion of land for agricultural use, industrial development, and urban sprawl has drastically reduced natural habitat for many species and is considered the most serious threat to biological diversity. Fragmentation divides once continuous natural habitats into smaller pieces that are often separated by areas unsuitable to sustain viable populations. The goal of the proposed research is to understand how important local population and metapopulation processes are altered by fragmentation of natural habitats in a model system of pond-breeding amphibians. The primary objectives of the proposed study are to experimentally compare demographic and behavioral responses of …
Collaborative Research: Land-Use Practices And Persistence Of Amphibian Populations., Malcolm L. Hunter Jr.
Collaborative Research: Land-Use Practices And Persistence Of Amphibian Populations., Malcolm L. Hunter Jr.
University of Maine Office of Research Administration: Grant Reports
Over the past 200 years, conversion of land for agricultural use, industrial development, and urban sprawl has drastically reduced natural habitat for many species and is considered the most serious threat to biological diversity. Fragmentation divides once continuous natural habitats into smaller pieces that are often separated by areas unsuitable to sustain viable populations. The goal of the proposed research is to understand how important local population and metapopulation processes are altered by fragmentation of natural habitats in a model system of pond-breeding amphibians. The primary objectives of the proposed study are to experimentally compare demographic and behavioral responses of …
Diet And Prey Availability Of Sturgeons In The Penobscot River, Maine, Matthew Dzaugis
Diet And Prey Availability Of Sturgeons In The Penobscot River, Maine, Matthew Dzaugis
Honors College
Although vital to the protection and conservation of species listed under the U.S. Endangered Species Act, critical habitat of shortnose sturgeon and Atlantic sturgeon in the Penobscot River, Maine have not yet been described. Critical habitat includes food availability as well as the physical characteristics of foraging habitat. To characterize seasonal availability of benthic prey, a ponar grab was used to collect over 125 benthic samples between 21 May and 8 October 2012. Samples were stratified throughout the river and broadly categorized by sediment type. All organisms within samples were identified to the family level. To characterize diet, stomach contents …
Dissertation Research: Eco-Evolutionary Effects Of An Aquatic Consumer: Linking Phenotypic Diversity To Community And Ecosystem Responses, Kevin S. Simon, Quenton Tuckett, Michael T. Kinnison
Dissertation Research: Eco-Evolutionary Effects Of An Aquatic Consumer: Linking Phenotypic Diversity To Community And Ecosystem Responses, Kevin S. Simon, Quenton Tuckett, Michael T. Kinnison
University of Maine Office of Research Administration: Grant Reports
This research addresses the interaction between ecological and evolutionary processes by examining the recent evolution of a common invasive fish species, the white perch, in lakes and the consequences of this evolution for community and ecosystem dynamics. White perch have successfully invaded lakes spanning a productivity gradient, which provides diverse selective pressures that may result in altered fish morphology, physiology and ecological role. Adaptation by these fish may, in turn, feed back to affect lake productivity and community structure through several ecological and chemical pathways. This project tests the hypothesis that this rapid evolutionary divergence within a single species has …
Collaborative Research: Extreme Discordance Between Allozyme And Non-Allozyme Introgression In Baltic Mussels. Selection On Allozymes?, Paul D. Rawson
Collaborative Research: Extreme Discordance Between Allozyme And Non-Allozyme Introgression In Baltic Mussels. Selection On Allozymes?, Paul D. Rawson
University of Maine Office of Research Administration: Grant Reports
A major challenge for evolutionary biologists is to determine the degree to which natural selection shapes genetic variation in natural populations. Hybridization is common between two species of blue mussel found in the North and Baltic Seas. The differential exchange of genes between the two mussel species, particularly genes encoding enzymes involved in central metabolic pathways, suggests those genes may be under selection and involved in adaptation to low salinity conditions in the Baltic Sea. Tests for selection will be conducted by comparing levels of genetic exchange for these metabolic genes against nonmetabolic and presumably neutral (i.e., not under selection) …
Collaborative Research: Toward Environmental Genomics: Can We Estimate Bacterial Diversity In The Ocean?, Daniel L. Distel
Collaborative Research: Toward Environmental Genomics: Can We Estimate Bacterial Diversity In The Ocean?, Daniel L. Distel
University of Maine Office of Research Administration: Grant Reports
Environmental genomics, wherein the total genomic diversity of a natural community may be sampled and analyzed in an ecological context, remains an elusive goal. This is due, at least in part, to (I) a lack of reliable estimates of total community diversity and (II) a lack of information regarding the exact phylogenetic, genomic and ecological units measured by commonly used diversity estimators. Although ribosomal RNA approaches have provided the first steps towards diversity estimation, and are widely used as a proxy for unique bacterial types in natural populations, the genomic unit a ribotype measures remains largely unexplored. It is generally …
1976 Deer Wintering Survey Of The St. John River-Dickey-Lincoln Project Area, Alan Hutchinson
1976 Deer Wintering Survey Of The St. John River-Dickey-Lincoln Project Area, Alan Hutchinson
Dickey-Lincoln School Lakes Project
As a result of renewed interest and funding for the Dickey-Lincoln Hydro-electric project, this study was initiated to update information on deer wintering habitat in the section of the St. John River Valley affected by the proposed impoundment. In particular, this project was aimed at determining the acreage of deer wintering habitat that would be directly lost due to the impoundment. In addition, the distribution of deer wintering habitat in the surrounding area was evaluated to give a regional perspective.
Logbook, U.S.S. Gannet, 1912-1913, George W. Greenleaf, United States Bureau Of Fisheries
Logbook, U.S.S. Gannet, 1912-1913, George W. Greenleaf, United States Bureau Of Fisheries
History of Maine Fisheries
Logbook of the U.S.S. Gannet, a research steam vessel commanded by Captain George W. Greenleaf for the United States Bureau of Fisheries hatchery located on McKown Point in Boothbay Harbor (Me.). The vessel was used by the hatchery in its efforts to preserve and increase fish stocks, including cod, haddock, polluck, flounder and lobsters. Records daily activities along the coast, including the number of seeders and eggs harvested and/or released, water temperatures, weather, and general maintenance of the vessel.