cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5063/aa/nrs.712.1
title: Scale Perspectives in Habitat Selection and Reproductive Sucess for Willow Flycatchers (Empidonax trillii) in the Central Sierra Nevad, CA

description: MASTERS THESIS: The Willow Flycatcher (Empidonax traillii) is a neotropical migratory species that has been extirpated from most of its range in California. Historically, the E. t. brewsteri and E. t. adastus subspecies were locally common in the Sierra Nevada mountain range of California. At this time it is believed that as few as 200 pair of this State Endangered species remain within the region. Because there is little information available on the current Willow Flycatcher population within the Sierra Nevada I examined habitat selection and animal performance at the meadow, territory and nest scales. During 1997 and 1998 survey efforts in 104 meadows documented Willow Flycatcher presence or absence, as well as broad scale vegetative and hydrologic condition. Six new willow flycatcher breeding sites were discovered, and 11 historically occupied sites were found to be vacant. Through intensive monitoring I followed reproductive success on 66 territories, and located and monitored 94 nests. Vegetative and hydrologic variables were measured in association with all territories and nest sites. I used multivariate and logistic regression to determine which variables best predicted animal performance at each of the three spatial scales: meadow, territory, and nest. IN addition, I used logistic regression to compare nest sites, territories, and occupied meadows with unused areas at each scale. Results suggest that shrub cover is the primary predictor of habitat selection at all three spatial scales. Of additional importance is a negative relationship between willow flycatcher presence and the dominance of forbs within the herbaceous layer, suggesting the need for meadows with elevated water tables and low disturbance levels. Shrub cover was again important in defining animal performance at the meadow and territory scales. Nest success improved with distance from trees. Management implications include the need to ensure that occupied meadows maintain elevated water tables, that shrub regeneration and recruitment occur, and that management activities do not disturb nesting birds. Unoccupied meadows should be restored to resemble occupied sites, particularly at historically occupied meadows, and meadows within dispersal distance of current breeding sites.
DOI: 10.5063/aa/nrs.713.1
title: Evolution of Life-History Characters and Phenotypic Plasticity in Mimulus guttatus

description: DOCTORATE DISSERTATION: Phenotypic variation results from genetic differentiation and plastic response to the environment. Patterns of both characters and character plasticities may be adaptive, selected to increase fitness under common conditions. I investigated the potential for evolution of life-history characters and phenotypic plasticity in Mimulus guttatus (Scrophulariaceae) by studying genetic variation among and within populations, natural selection, and evolutionary response to selection. In a controlled environment I found genetic differentiation among populations consistent with local adaptation to water persistence for life-history characters and their plasticities. Annual populations from seasonally wet habitats had greater reproductive effort, less vegetative allocation, and more, smaller flowers than perennial populations from persistently wet habitats, These differences were not found under all water conditions, indicating that plasticity to water availability differed among populations in parallel with habitat water persistence. Heritability estimates were used to measure genetic variation for life-history characters and their plasticities in two populations. Heritabilities for both characters and plasticities were comparable in magnitude, but varied with water availability. Heritabilities wer least in the annual population and greatest in the perennial population under moderate water conditions. For each population, heritability was greatest for plasticity to water levels uncommon in their natural habitat. When experimental plants were grown in a natural M. guttatus population, there was phenotypic selection to decrease flowering date and increase shoot weight, and stabilizing quadratic selection on life span. Selection on plasticities acted to decrease variation in flowering date and increase variation in life span. Genetic variation in characters and plasticities, measured on the same individuals, combined with selection reveals the potential for evolution by natural selection. The evolution of characters and plasticities was tested with replicate experimental populations planted into nature. Plants from populations that flowered earlier, had shorter life spans and were less productive, produced offspring of longer lived plants from high productivity areas. Evolutionary change in life-history characters and their plasticities in response to microenvironmental variation revealed that both are important adaptations to heterogeneous natural environments.
DOI: 10.5063/aa/nrs.714.1
title: Nest Success of the Yellow Warblers (Dendroica petechia) and Willow Flycatchers (Epidonax traillii) in Relation to Predator Activity in Montane Meadows of the Central Sierra Nevada, CA.

description: MASTERS THESIS: Willow flycatchers (Empidonax traillii) and yellow warblers (Dendroica petechia) are both riparian-dependent neotropical migrant songbirds that have declined throughout much of their former range in California. Population declines have been primarily associated with the loss of riparian breeding habitat; increases in brood parasitism and nest predation have also contributed to declines and may be limiting population growth. IN this study, I determined the effect of potential nest predator activity on the nest success of both species, and identified potential willow flycatcher nest predators using yellow warbler nests as a surrogate. I used track plate transects, point counts, and time-constrained visual encounter surveys to assess potential mammalian, avian, and reptilian nest predator activity, respectively. I used simple linear regression and multiple linear regression analyses to determine the relationship between nest predator activity and nest success. Nest predation was the major cause of nest failure in both species. Only a small subset of the potential nest predator species detected in the meadows had activity indidices that were associated with the nest success of either species and include short-tailed weasel, Douglas squirrel, brown-headed cowbird, Clark s nutcracker, and Cooper s hawk. The magnitude of the effects of the different predator species on nest success varied depending on the prey species and the stage in the nesting cycle. Nest location relative to the forest edge and the amount of the meadow covered with water also influenced nest success. Short-tailed weasel, Douglas squirrel, lodgepole chipmunk, deer mouse and unidentified chipmunk species were photographed depredating yellow warbler nests baited with zebra finch eggs. Management recommendations include the active flooding of portions of the meadows to restrict meadow access to forest edge associated nest predators and habitat restoration in areas of meadows that avoid the creation of ecological traps should be employed to insure the persistence of high quality breeding habitat for willow flycatchers and yellow warblers in the central Sierra Nevada.
DOI: 10.5063/aa/nrs.717.1
title: Groundwater flowpaths, chemical weathering rates, and climate change patterns as determined using multiple environmental tracers

description: DOCTORATE DISSERTATION: The study of interactions within Earth s critical zone, or surface environment, provides an understanding of the integral links between the hydrosphere, lithosphere, atmosphere, and biosphere, Central to the study of the critical zone are chemical weathering, surface, and near-surface hydrology. Geochemical tracers provide insight into the interactions between processes in the critical zone. IN the series of studies described herein, chlorofluorocarbons (CFCs), tritium, major ion chemistry, as well as oxygen, hydrogen, and helium isotopes were used to understand groundwater residence times, groundwater movement, and the origin of solutes in the near surface zone. The two main field sites, Sagehen basin and the Mission Tunnel, differ greatly in their geologic settings and provide an interesting contrast and broad test for the applicability of using environmental tracers in near surface systems. Sagehen basin is located in the Sierra Nevada of California. The chemical and isotope composition of groundwater springs in Sagehen basin were used to decipher an archive of internal and external changes. A positive correlation was found between groundwater residence times and the chemistry of the waters. This correlation is strong evidence for the chemical evolution of groundwater and suggests internal changes in the system are recorded by shallow groundwater and is accessible with springs. The oxygen isotope content of the spring waters also correlates with groundwater residence times. This correlation is related to air temperature and atmospheric circulation pattern changes, suggesting groundwater systems also archive external changes. The Mission Tunnel of Santa Barbara, California, provides a very different environment for studying groundwater flowpaths and solute chemistry. By using multiple geochemical tracers, different age components of the groundwater system were separated. Due to the highly fractured nature of the aquifers, no correlation was found between the minimum flowpath lengths and groundwater age components. Ion chemistry of the goundwaters suggest that flow is primarily in the vertical direction. In addition, time series analysis of long-term records of precipitation and groundwater seepage into the tunnel suggest that there is a 3 month lag between precipitation and seepage events and that antecedent conditions of the groundwater system strongly control the response to precipitation loading.
DOI: 10.5063/aa/nrs.720.1
title: Local and Landscape Influences on Meadow Butterfly Communities in Northeastern Sierra Nevada

description: MASTERS THESIS: Conservation planning and ecological research aimed at understanding patterns of biological diversity have focused on determining which environmental factors influence populations and communities. While local environmental factors were long considered to be of central importance, and interest in landscape context surged in the 1970s following the development of the theory island biogeography. In this study, I examined the relative influence of both local and landscape factors on butterfly communities in montane meadows of northeastern California. I ask if local attributes of meadows are more important than landscape context in determining butterfly richness and abundance, and I also examine meadow specialist and generalist butterflies, as well as the most abundant individual butterfly species. The strongest patterns were related to three variables. A single landscape variable, the percent of sagebrush vegetation in the matrix surrounding meadows, was strongly and negatively related to total butterfly richness and abundance as well as estimated butterfly richness and the abundance of a meadow generalist butterfly, Pyrgus communis. A single local variable, cover of obligate wetland plants within meadows, was strongly and positively related to species richness and abundance of meadow specialist butterflies, and the abundance of a single meadow specialist species, Plebejus podarce. In addition, elevation was positively related to the abundance of two butterfly species, Speyeria mormonia and Colias eurytheme, and negatively related to the abundance of Coenonympha tullia ssp. ampelos and Satyrium behrii. In general, local factors explained more of the variation for butterfly variables than landscape factors. Further, the moisture and topographical gradients that influence meadow butterfly communities suggest that protecting both moist meadow habitats and surrounding matrix habitats are important for conserving this faunal group.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.40.1
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.40.2
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.50.1
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-11-01. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.50.2
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-11-01. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.50.3
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-11-01. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.50.4
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-11-01. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011101.50.5
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-11-01. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.40.1
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.40.2
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.50.1
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-12-15. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was -20.1 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.50.2
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-12-15. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was -20.1 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.50.3
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-12-15. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was -20.1 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.50.4
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-12-15. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was -20.1 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20011215.50.5
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2001-12-15. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was -20.1 minutes.
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20020118.40.1
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20020118.40.2
title: (:unkn)
DOI: 10.6085/aa/jalxxx_015mtbd014r00_20020118.50.1
title: PISCO: Physical Oceanography: moored temperature data: Jalama Beach Campground, California, USA (JAL)

description: This metadata record describes moored seawater temperature data collected at Jalama Beach Campground, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2002-01-18. The instrument depth was 014 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.11
title: CINMS/PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMSXXX)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.2
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.3
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.4
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.5
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.6
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.7
title: PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.8
title: MBNMS/PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050525.50.9
title: CINMS/PISCO: Physical Oceanography: moored temperature data: San Miguel Island, California, USA (SMS)

description: This metadata record describes moored seawater temperature data collected at San Miguel Island, California, USA, by PISCO. Measurements were collected using StowAway Tidbit Temperature Loggers (Onset Computer Corp. TBIC32+4+27) beginning 2005-05-25. The instrument depth was 009 meters, in an overall water depth of 015 meters (both relative to Mean Sea Level, MSL). The sampling interval was 2.0 minutes.
DOI: 10.6085/aa/smsxxx_015mtbd009r00_20050613.40.1
title: (:unkn)