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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Characterizing The Habitat Use Of Pacific Coast Feeding Group Gray Whales (Eschrichtius Robustus) And The Spatial And Temporal Variability Of Their Benthic And Planktonic Invertebrate Prey In Northern California, Robyn E. Norman
Cal Poly Humboldt theses and projects
As opportunistic foragers, the Eastern North Pacific population (~20,000) of gray whales (Eschrichtius robustus) feed on diverse benthic and planktonic invertebrates in northern Alaska foraging grounds before they undertake one of the largest yearly migrations of any mammal to breed in Baja California, Mexico. While most of the population travels to the summer foraging grounds in Alaska, a sub-group of whales (~230) called the Pacific Coast Feeding Group (PCFG) summer between British Columbia, Canada, and northern California. The diet of PCFG whales typically includes high-density and/or high-caloric prey items like mysids and diverse species of amphipods, yet a …
Environmental Implications Of Modern Food Production: An Analysis For The Conscious Consumer, Jessica T. Coming
Environmental Implications Of Modern Food Production: An Analysis For The Conscious Consumer, Jessica T. Coming
Cal Poly Humboldt theses and projects
This project explores the pathways by which agriculture affects the environment and determines which foods have the greatest climate, water, and land impacts. Agricultural effects on the environment are extensive, from loss of habitat and declines in regional biodiversity to disruption of global nutrient cycles and climate change. Global food production accounts for 26-34% of annual anthropogenic greenhouse gas emissions, makes up 38-46% of habitable land, and is responsible for 70% of freshwater extraction. The effect of agriculture on the environment is most significantly dictated by what type of food is being produced. Animal-based food products consistently have the highest …
Using Habitat Modeling To Locate New Populations Of Dunn's Salamander (Plethodon Dunni) Near Its Southern Geographic Range Limit, Mary A. Mackey
Using Habitat Modeling To Locate New Populations Of Dunn's Salamander (Plethodon Dunni) Near Its Southern Geographic Range Limit, Mary A. Mackey
Cal Poly Humboldt theses and projects
Habitat suitability models were utilized to direct survey efforts for Plethodon dunni in Northern California. Two models were created, one using traditional statistical methods (GLM or Generalized Linear Modeling) and the other using a machine learning method (MaxEnt or Maximum Entropy modeling). Plots were selected from areas of agreement and disagreement between the models to carry out presence surveys. The MaxEnt model yielded better predictions than the GLM model. The two models had three variables in common (annual temperature range, precipitation of driest month, and precipitation seasonality) and predicted suitable habitat within the known range of P. dunni. The …
The Larval Preference Of An Invasive Bryozoan (Watersipora 'New Species') For Copper-Based Antifouling Paints, Alexander K. Strawhand
The Larval Preference Of An Invasive Bryozoan (Watersipora 'New Species') For Copper-Based Antifouling Paints, Alexander K. Strawhand
Cal Poly Humboldt theses and projects
The bryozoan Watersipora subtorquata and its cryptic congener Watersipora ‘new species’ are now globally invasive species. Previous studies have found this species complex to have a high tolerance to copper-based antifouling paints, which represent a large portion of the mitigation effort toward preventing hull fouling by invasive invertebrates. Tolerance alone, however, is unlikely to explain the full extent of Watersipora’s massive and rapid worldwide invasion success. The aim of this research was to move beyond tolerance, and test whether larvae of Watersipora ‘new species’ exhibit a preference for copper-coated settlement surfaces in both laboratory and field settings. For the laboratory …
A Case Of Incipient Budding Speciation In The California Floristic Province, Infraspecific Divergence In Abronia Villosa, Eli J. Allen
A Case Of Incipient Budding Speciation In The California Floristic Province, Infraspecific Divergence In Abronia Villosa, Eli J. Allen
Cal Poly Humboldt theses and projects
Physical barriers to gene flow are the traditional evidence for species divergence. Conversely, there has been increasing acknowledgment of speciation in the face of gene flow as an evolutionary process. Budding speciation involves peripheral populations adapting to local ecological conditions, thereby budding off from a widespread progenitor species. Budding speciation is distinguished by ecological divergence and is generally evidenced by asymmetrical range size and nested phylogenetic relationships of sister species. The narrow endemic Abronia villosa var. aurita is adapted to montane sandy washes adjacent to its widespread sister variety, the desert dwelling var. villosa. Here, I tested the hypothesis …
Using Biological Parameters And Traditional Ecological Knowledge To Study The Status Of Spirinchus Starksi (Night Smelt) In Northern California, Z. Zenobia
Cal Poly Humboldt theses and projects
Night smelt spawns from central California to southeast Alaska, on the shore of sandy beach surf zones at night. This species is a vital part of regional food webs and, in California, is fished commercially primarily in Humboldt and Del Norte counties. It has cultural importance for dietary and subsistence needs to the Tribes across the coast, as well as inland. The objectives of this thesis are as follow: study the status of the population of night smelt in Humboldt and Del Norte counties by (A) comparing the abundance, length, weight, age, sex ratio, and timing of reproduction of the …