Nathan Wolf results 17
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SNAPSHOT USA 2024: Year 6 of the Coordinated National Camera Trap Survey of the United StatesNARA Subscribed
Motivation SNAPSHOT USA is an annual, multi‐contributor camera trap survey of mammals across the United States. The growing SNAPSHOT USA dataset is intended for tracking the spatial and temporal responses of mammal populations to changes in land use, land cover and climate. These data will be useful for exploring the drivers of spatial and temporal changes in relative abundance and distribution, as well as the impacts of speci...
High latitudes are at the leading edge of biological invasions, and commercial shipping, a widely available mechanism for transporting non-indigenous species (NIS), presents a multi-faceted and novel risk to port systems experiencing increasing vessel traffic. This study uses vector analysis, a foundational aspect of regional biosecurity evaluation, to explore the relative likelihood of commercial vessels introducing non-indig...
Exploring Spatial and Temporal Patterns in the Size‐At‐Age of Pacific Halibut in the Gulf of AlaskaNARA Subscribed
Large changes in Pacific halibut ( Hippoglossus stenolepis ) size‐at‐age across decades have affected available fishery yield and management decisions. Characterizing mechanisms driving variability in size‐at‐age of adult Pacific halibut is challenging due to uncertainty associated with spatial and temporal partitioning of the phenomenon. We explored spatial and temporal changes in size‐at‐age structure of Pacific halibut in t...
SNAPSHOT USA 2019–2023: The First Five Years of Data From a Coordinated Camera Trap Survey of the United StatesNARA Subscribed
Motivation SNAPSHOT USA is an annual, multicontributor camera trap survey of mammals across the United States. The growing SNAPSHOT USA dataset is intended for tracking the spatial and temporal responses of mammal populations to changes in land use, land cover and climate. These data will be useful for exploring the drivers of spatial and temporal changes in relative abundance and distribution, as well as the impacts of specie...
For anadromous fish entering the marine environment, we expect the probability of avoiding predation and starvation to increase with the quality and/or quantity of dietary resources consumed during the period immediately prior to, and following, ocean entry. Here, we report the results of research examining trophic history in relation to fork length, mass, and body condition in juvenile Chinook salmon captured in the southern...
Biogeographic context is related to local scale tree demography, co‐occurrence and functional differentiationNARA Subscribed
Identifying the drivers of community structure and dynamics is a major pursuit in ecology. Emphasis is typically placed on the importance of local scale interactions when attempting to explain these fundamental ecological patterns. However, regional scale phenomena are also important predictors. The importance of regional scale context should be more evident in assemblages where multiple species are close to their range margin...
The propensity for fisheries management agencies in the United States to collect or request stakeholder‐based data has grown considerably in the last decade. While systems are in place for the review and use of biological data in management, there is far less structure to the integration of non‐economic social data. Here, we present a framework for characterizing the applicability of various forms of social data in regulatory...
Reproductive Biology of Female Pacific Halibut (Hippoglossus stenolepis) in the Gulf of AlaskaOA Marine
Developing a robust understanding of Pacific halibut reproductive biology is essential to understanding the different components (e.g. maturity) that determine the reproductive output of the species and, therefore, for estimating the relative female spawning biomass. With these, effective and proactive management strategies can be designed and implemented to face the large-scale environmental changes to which high-latitude spa...
The advancement of conservation practices in global trawl fisheries has been impeded in part by a lack of a collective understanding of the most relevant and broad-scale knowledge-needs, along with the identification of potential barriers to addressing these knowledge-needs. Using both an online survey and an in-person workshop, we engaged a diversity of fishing industry stakeholders including scientists, technology companies,...
A comprehensive description of oocyte developmental stages in Pacific halibut, Hippoglossus stenolepisNARA Subscribed
Accurate characterization of oocyte development is essential to understanding foundational aspects of reproductive biology and successful management of Pacific halibut ( Hippoglossus stenolepis ). Here this study provides complete histological descriptions for eight oocyte developmental stages in addition to postovulatory follicles and demonstrates the potential for oocyte size frequency distribution to act as a proxy for ovar...
Exploring sample cross‐contamination in fish epidermal mucusNARA Subscribed
Cross‐contamination of epidermal mucus was assessed at three sampling locations on the bodies of Pacific halibut Hippoglossus stenolepis by inducing contact between fish coated with labelled synthetic mucus and non‐treated fish. Results indicate a positive relationship between sampling site exposure and sample contamination and that mucous sample cross‐contamination can be mitigated by sampling in a location protected from ext...
The role of functional uniqueness and spatial aggregation in explaining rarity in treesNARA Subscribed
Aim Determining the drivers of species rarity is fundamental for understanding and conserving biodiversity. Rarity of a given species within its community may arise due to exclusion by other ecologically similar species. Conversely, rare species may occupy habitats that are rare in the landscape or they may be ill‐suited to all available habitats. The first mechanism would lead to common and rare species occupying similar ecol...
Stochastic dilution effects weaken deterministic effects of niche‐based processes in species rich forestsNARA Subscribed
Recent theory predicts that stochastic dilution effects may result in species‐rich communities with statistically independent species spatial distributions, even if the underlying ecological processes structuring the community are driven by deterministic niche differences. Stochastic dilution is a consequence of the stochastic geometry of biodiversity where the identities of the nearest neighbors of individuals of a given spec...
Mechanisms underlying local functional and phylogenetic beta diversity in two temperate forestsNARA Subscribed
Although trait information has been widely used to explore underlying mechanisms of forest community structure, most studies have focused on local patterns of phylogenetic or functional alpha diversity. Investigations of functional beta diversity, on the other hand, have not been conducted at local scales in a spatially explicit way. In this study, we provide a powerful methodology based on recent advances in spatial point pat...
Phylogenetic and functional alpha and beta diversity in temperate and tropical tree communitiesNARA Subscribed
The study of biodiversity has tended to focus primarily on relatively information‐poor measures of species diversity. Recently, many studies of local diversity (alpha diversity) have begun to use measures of functional and phylogenetic alpha diversity. Investigations into the phylogenetic and functional dissimilarity (beta diversity) of communities have been far less numerous, but these dissimilarity measures have the potentia...
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