Michael R. Bower

Michael R. Bower
National Park Service | NPS · Southeast Alaska Network

About

44
Publications
5,192
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503
Citations
Citations since 2017
10 Research Items
258 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (44)
Article
Recent technological advancements have seen a rapid growth in the use of imagery data to estimate the abundance and spatial distribution of animal populations. However, the value of imagery data may not be fully exploited under traditional analytical frameworks. We developed a method that leverages aerial imagery data for population modeling throug...
Article
Partial differential equations (PDEs) are a useful tool for modeling spatiotemporal dynamics of ecological processes. However, as an ecological process evolves, we need statistical models that can adapt to changing dynamics as new data are collected. We developed a model that combines an ecological diffusion equation and logistic growth to characte...
Article
Full-text available
Aim Sea otters (Enhydra lutris) are an apex predator of the nearshore marine community and nearly went extinct at the turn of the 20th century. Reintroductions and legal protection allowed sea otters to re‐colonize much of their former range. Our objective was to chronicle the colonization of this apex predator in Glacier Bay, Alaska, to help under...
Technical Report
Full-text available
Sea otters (Enhydra lutris kenyoni) are an apex consumer in the North Pacific Ocean and are known to influence and structure nearshore marine communities. Sea otters were extirpated from southeastern Alaska prior to 1911 due to the commercial fur trade; however, approximately 400 sea otters were reintroduced to southeastern Alaska in the 1960s. By...
Technical Report
Full-text available
Airborne, freshwater, and marine contaminants were designated as priority long-term monitoring programs (vital signs) for the Southeast Alaska Inventory and Monitoring Network (SEAN). Here, we integrate these three vital signs into one environmental contaminants monitoring program in order to increase data collection and reporting efficiency for ti...
Article
Population dynamics varies in space and time. Survey designs that ignore these dynamics may be inefficient and fail to capture essential spatio-temporal variability of a process. Alternatively, dynamic survey designs explicitly incorporate knowledge of ecological processes, the associated uncertainty in those processes, and can be optimized with re...
Preprint
Population dynamics varies in space and time. Survey designs that ignore these dynamics may be inefficient and fail to capture essential spatio-temporal variability of a process. Alternatively, dynamic survey designs explicitly incorporate knowledge of ecological processes, the associated uncertainty in those processes, and can be optimized with re...
Article
Full-text available
Species distribution and abundance are critical population characteristics for efficient management, conservation, and ecological insight. Point process models are a powerful tool for modeling distribution and abundance, and can incorporate many data types, including count data, presence-absence data, and presence-only data. Aerial photographic ima...
Poster
Full-text available
Compared to the contiguous United States, Alaska presents unique challenges for assessing pollution in our nation’s protected lands. For example, even though mercury emissions have decreased in the United States, recent studies suggest that mercury continues to accumulate in Alaska due to atmospheric transport of Asian coal burning emissions. Addit...
Article
Full-text available
Ecological invasions and colonizations occur dynamically through space and time. Estimating the distribution and abundance of colonizing species is critical for efficient management or conservation. We describe a statistical framework for simultaneously estimating spatio-temporal occupancy and abundance dynamics of a colonizing species. Our method...
Article
We completed a landscape-scale assessment of ungulate browsing pressure on the southeastern portion of the Bighorn National Forest and found evidence of constraints on willow morphology and height. To better understand these apparent constraints over time and to enable adaptive habitat management, we propose development of a willow monitoring schem...
Article
The Devils Hole pupfish, Cyprinodon diabolis, is a federally-endangered fish that is endemic to Devils Hole, a discontiguous part of Death Valley National Park in Nye County, Nevada. Due to its status, Devils Hole pupfish monitoring must be non-obtrusive and thereby exclude techniques that require handling fish. Due to a recent decline in pupfish a...
Article
Located on the floor of Death Valley (CA, USA), Salt Creek harbors a single fish species, the Salt Creek pupfish, Cyprinodon salinus salinus, which has adapted to this extremely harsh environment. Salt Creek is fed by an underground spring and is comprised of numerous pools, runs, and marshes that exhibit substantial variability in temperature, sal...
Article
We assessed four potential sources of error in estimating size of the population of Devils Hole pupfish (Cypnnodon diabolis): net, time of day, diver, and order of diver. Experimental dives (3/day) were conducted during 4 days in July 2009. Effects of the four sources of error on estimates from dive surveys were analyzed using a split-split plot AN...
Article
We used variance components to assess allocation of sampling effort in a hierarchically nested sampling design for ongoing monitoring of early life history stages of the federally endangered Devils Hole pupfish (DHP) (Cyprinodon diabolis). Sampling design for larval DHP included surveys (5 days each spring 2007–2009), events, and plots. Each survey...
Conference Paper
The Devils Hole pupfish Cyprinodon diabolis is a federally-endangered fish that is endemic to Devils Hole, Nye County, NV. Due to its endangered status, Devils Hole pupfish monitoring must be non-obtrusive and thereby exclude techniques that require handling fish. While certain aspects of Devils Hole pupfish ecology have been studied extensively, k...
Conference Paper
We assessed the accuracy and precision of visual estimates from two divers and photogrammetric measurements from a diver-operated stereo-video camera system for determining length of Saratoga Springs pupfish Cyprinodon nevadensis nevadensis varying from 12 to 36 mm (total length), under controlled conditions. Visual estimates by two divers differed...
Article
We assessed the accuracy and precision of visual estimates from two divers and photogrammetric measurements from a diver-operated stereo-video camera system for determining the length of Saratoga Springs pupfish Cyprinodon nevadensis nevadensis (12–36 mm total length) under controlled conditions. Visual estimates by two divers differed significantl...
Conference Paper
Devils Hole is a window into the carbonate groundwater is located in the Amargosa Valley of southwestern Nevada, and is the sole habitat for the endangered Devils Hole pupfish (Cyprinodon diabolis). While temperatures within the deeper areas of Devils Hole are at the upper threshold for aquatic life (consistently around 33.5°C), temperatures on the...
Article
Hybridization with nonnative fishes is a major factor influencing the status of native catostomids in the Colorado River basin. In Wyoming, hybridization with nonnative white suckers Catostomus commersonii is a particular concern in the conservation of native bluehead suckers C. discobolus and flannelmouth suckers C. latipinnis. The purpose of this...
Article
Peces nativos de Upper Colorado River Basin han experimentado una decadencia substancial en abundancia y distribución, y han sido eliminados de la mayor parte del Estado de Wyoming. Muddy Creek, en la parte sur central de Wyoming (la cuenca del Little Snake River), contiene poblaciones simpátricas del charalito aleta redonda (Gila robusta), y de lo...
Article
We investigated the effects of constructed instream structures on movements and demographics of bluehead suckers Catostomus discobolus, flannelmouth suckers C. latipinnis, and roundtail chub Gila robusta in the upstream portion of Muddy Creek, an isolated headwater stream system in the upper Colorado River basin of Wyoming. Our objectives were to (...
Article
Full-text available
We assessed the distributions of three species of conservation concern, bluehead sucker (Catostomus discobolus), flannelmouth sucker (Catostomus latipinnis), and roundtail chub (Gila robusta), relative to habitat features across a headwater tributary system of the Colorado River basin in Wyoming. We studied the upper Muddy Creek watershed, Carbon C...
Article
Full-text available
The genetic impacts of hybridization between native and introduced species are of considerable conservation concern, while the possibility of reticulate evolution affects our basic understanding of how species arise and shapes how we use genetic data to understand evolutionary diversification. By using mitochondrial NADH dehydrogenase subunit 2 (ND...
Article
Full-text available
Black spot is a common disease syndrome of freshwater fishes. This study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, Uvulifer sp., infecting native and non-native catostomids and cyprinids of the Upper Colorado River Basin. We evaluated the density rank of...
Article
Full-text available
Understanding the population dynamics of native and nonnative fishes is critical for guiding and evaluating management activities, but obtaining information on population dynamics is often dependent on identifying structures that provide precise estimates of age. We examined age estimation using various hard structures for native bluehead suckers C...
Article
Full-text available
This study was conducted to describe the distributions of both native and nonnative fishes and to identify spatial patterns in fish assemblage structure of Muddy Creek in the upper Colorado River basin of Wyoming using data collected from 77 reaches during 1999–2004. Fish assemblages in high-elevation reaches were characterized by brook trout (Salv...
Article
Full-text available
Native fishes of the upper Colorado River basin (UCRB) have declined in distribution and abundance due to habitat degradation and interactions with nonnative fishes. Consequently, monitoring populations of both native and nonnative fishes is important for conservation of native species. We used data collected from Muddy Creek, Wyoming (2003–2004),...
Article
Native fishes of the Upper Colorado River Basin have experienced substantial declines in abundance and distribution, and are extirpated from most of Wyoming. Muddy Creek, in south-central Wyoming (Little Snake River watershed), contains sympatric populations of native roundtail chub (Gila robusta.), bluehead sucker, (Catostomus discobolus), and fla...
Article
Full-text available
Assessment of habitat and fish assemblages to determine the extent of anthropogenic alterations and define conditions relative to management goals is an important activity of management agencies. Assessment activities have been traditionally conducted at relatively small spatia scales (e.g., reaches and channel units), but many problems facing mana...
Article
Assessment of habitat and fish assemblages to determine the extent of anthropogenic alterations and define conditions relative to management goals is an important activity of management agencies. Assessment activities have been traditionally conducted at relatively small spatial scales (e.g., reaches and channel units), but many problems facing man...

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Projects

Projects (4)
Project
Sea otters were identified as a vital sign by the National Park Service’s Southeast Alaska Network (SEAN) Monitoring Program due to their role as a keystone species in the nearshore marine ecosystem with the primary objectives of using contemporary field and analytical methods to monitor the abundance and spatial distribution of sea otters in Glacier Bay. A spatio-temporal statistical model representing current knowledge of sea otter abundance and distribution, including underlying ecological processes governing colonization dynamics in Glacier Bay was constructed using multiple sources of data collected on sea otters between 1993 and 2012 by the U.S. Geological Survey and will accommodate future data to be collected via aerial photographic surveys.
Archived project
Since 2009, the National Park Service’s Southeast Alaska Inventory and Monitoring Network has monitored population abundance and spatial distribution of Kittlitz's and marbled murrelets in Glacier Bay National Park and Preserve, an important summer residence for both species.
Archived project
We track the status and trends of specific conductance, dissolved oxygen, pH, water temperature and turbidity in the Salmon River (Gustavus), Taiya River (Skagway), and Indian River (Sitka) by measuring these parameters hourly from April through November. Data have been collected since 2010 and are publicly available for download at: http://science.nature.nps.gov/im/units/sean/FQ_main.aspx Additionally, we have leveraged these data in peer-reviewed articles providing guidance on long-term water quality monitoring.