A5052784581- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine animal studies overview
- Freshwater macroinvertebrate diversity and ecology
- Avian ecology and behavior
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Coral and Marine Ecosystems Studies
- Marine Bivalve and Aquaculture Studies
- Ichthyology and Marine Biology
- Insect-Plant Interactions and Control
- Plant and animal studies
- Invertebrate Taxonomy and Ecology
- Fish Biology and Ecology Studies
- Amphibian and Reptile Biology
- Animal Behavior and Reproduction
- Physiological and biochemical adaptations
- Coastal and Marine Management
- Environmental Toxicology and Ecotoxicology
- Parasite Biology and Host Interactions
- Animal Vocal Communication and Behavior
- Economic and Environmental Valuation
- Wildlife Conservation and Criminology Analyses
- Agricultural risk and resilience
- Auction Theory and Applications
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2012-2022
National Oceanic and Atmospheric Administration
2013-2022
NOAA National Marine Fisheries Service
2013-2022
Illinois State University
2007-2010
Winthrop University
2009-2010
Purdue University West Lafayette
2003-2008
Rocky Mountain Biological Laboratory
2003-2008
Allegheny College
2003
Invasive species can have large effects on freshwater communities and ecosystems. Potamopyrgus antipodarum, a snail indigenous to New Zealand, has recently colonized North America. We documented the distribution density of P. antipodarum in major tributaries Madison River Greater Yellowstone Ecosystem, examined associations between native macroinvertebrates, experimentally how affected colonization substrates by other macroinvertebrates. In 1997 1998, we sampled benthic macroinvertebrates...
Significance The incidental catch of threatened species is still one the main barriers to fisheries sustainability. What would happen if we closed 30% ocean fishing with goal reducing bycatch? Analyzing 15 different around globe, found that under static area management, such as classic no-take marine closures, observed bycatch could be reduced by 16%. However, dynamic management based on and closing same total but fragmented in smaller areas can move year year, reduction increase up 57% at...
Identifying spatiotemporal hotspots is important for understanding basic ecological processes, but particularly species at risk. A number of terrestrial and aquatic are indirectly affected by anthropogenic impacts, simply because they tend to be associated with that targeted removals. Using newly developed statistical models allow the inclusion time‐varying spatial effects, we examine how co‐occurrence a nontargeted can modeled as function environmental covariates (temperature, depth)...
Spatiotemporal predictions of bycatch (i.e., catch nontargeted species) have shown promise as dynamic ocean management tools for reducing bycatch. However, which spatiotemporal model framework to use generating these is unclear. We evaluated a relatively new method, Gaussian Markov random fields (GMRFs), with two other frameworks, generalized additive models (GAMs) and forests. fit geostatistical delta-models fisheries observer data six species broad range movement patterns (e.g., highly...
SUMMARY 1. Larvae of cased caddisflies (Limnephilidae and Phryganeidae) are among the most abundant conspicuous invertebrates in northern wetlands. Although species replacements often observed along permanence gradients, underlying causal mechanisms poorly understood. In this paper, we report on distributional patterns permanent temporary high‐altitude ponds, how those reflect differences life history characteristics that affect desiccation tolerance (fundamental niches) versus constraints...
Abstract Quantifying effects of fishing on non-targeted (bycatch) species is an important management and conservation issue. Bycatch estimates are typically calculated using data collected by on-board observers, but observer programmes costly therefore often only cover a small percentage the fishery. The challenge then to estimate bycatch for unobserved activity. status quo most fisheries assume ratio effort constant multiply this in activity (ratio estimator). We used dataset with 100%...
Summary Protected and managed species, including harvested fishes, exhibit spatial temporal variation in their distribution productivity. Spatio‐temporal can arise from differences habitat quality, human impacts (including harvest), density‐dependent changes per capita productivity, as well individual movement. Human (e.g. direct harvest) also vary spatially over time, monitoring the overlap between population is necessary to ensure that are sustainable prioritize research management for...
Body size influences most biological processes from metabolic rates to the outcome of interspecific interactions. Within a species, sexual dimorphism (SSD) reflects either differential selection on body males and females or phylogenetic inertia. Among taxa, SSD should decrease as increases when are larger sex — pattern known Rensch's rule. We examined size, SSD, rule among 29 species adult hydropsychid caddisflies (Trichoptera: Hydropsychidae) 12 closely related caddisfly species. Females...
Abstract 1. How populations respond to environmental change depends, in part, on the connection between variance during early life stages and its effect subsequent life‐history traits. For example, variation larval stage can influence histories of organisms with complex cycles by altering amount time spent each cycle as well allocation traits metamorphosis. 2. The effects energetic resources developmental timing, adult mass, fecundity, mating success, body structures (thorax, abdomen, wings)...
Environmental factors influence variation in life histories by affecting growth, development, and reproduction. We conducted an experiment outdoor mesocosms to examine how diet a time constraint on juvenile development (pond-drying) life-history trade-offs (growth, adult body mass) the caddis fly Limnephilus externus (Trichoptera: Limnephilidae). predicted that: (1) supplementation would accelerate larval growth enhance survival adulthood; (2) pond-drying increase mortality; (3) relationship...
Bird scaring lines (BSLs) protect longline fishing gear from seabird attacks, save bait, reduce incidental mortality and are the most commonly prescribed bycatch mitigation measure worldwide. We collaborated with fishermen to assess efficacy of applying BSL regulations demersal sablefish fishery in Alaska a similar along U.S West Coast. In contrast Alaska, some U.S. Coast vessels use floats line keep hooks off seafloor, where scavengers degrade bait target catch. Our results confirmed that...
Spatial and temporal management measures to reduce nontarget catch are important strategies for rebuilding overfished rockfish (Sebastes spp.) populations in the Northeast Pacific. We describe efforts support reducing bycatch central California trawl fisheries by testing efficacy of move-on rules on data from 2002 2010. Move-on regulations or guidelines that trigger temporary closure a fishery targeted area when threshold is reached, without entire fishery. based spatiotemporal...
Abstract Intraspecific geographic variation in morphology and behavior can be indicative of populations that are adapted to local environmental conditions. Heterogeneity the abiotic environment, such as soil conditions, an important driver adaptation. In south Florida, mean body sizes lubber grasshopper Romalea microptera (Beauvois) (Orthoptera: Acrididae), increase from west east. We tested how size variation, population origin, physical characteristics associated with oviposition depth...
Fisheries bycatch is driven by both ecological (e.g., area, season) and social fisher behavior) factors that are often difficult to disentangle. We demonstrate a method for comparing fishery‐dependent fishery‐independent catch delineate the influence of on provide insights management. used data from commercial fishing vessels in U.S. west coast trawl groundfish fishery (fishery‐dependent collected fisheries observers) scientific bottom survey (fishery‐independent data) compare relative...
Effective management of multispecies fisheries in large marine ecosystems is challenging. To deal with these challenges, managers are moving toward ecosystem-based fishery (EBFM). Despite this shift, many species remain outside protective legislation or plans. How do that fall formal structures respond to changes strategies? In 2011, the US West Coast Groundfish Fishery (WCGF) shifted an Individual Fishing Quota (IFQ) program. We used data collected by observers examine impact shift on...
Abstract. 1. Density‐dependent phase polyphenism occurs when changes in density during the juvenile stages result a developmental shift from one phenotype to another. is common among locusts (Orthoptera: Acrididae). 2. Previously, we demonstrated longitudinal geographic cline adult body size (western populations = small adults; eastern large adults) lubber grasshopper ( Romalea microptera ) south Florida. As lubbers are confamilial with locusts, hypothesised that was partly due...
Abstract Geographic clines in body size have been described for many species, but relatively few investigations tested hypotheses the ontogenetic mechanisms maintaining geographic clines. We formalize and test predictions role of (e.g., hatching timing size, juvenile developmental time, growth rate) a longitudinal cline adult lubber grasshoppers [Romalea microptera (Beauvois)]. To obtain we collected eggs from wild females several populations along gradient 2 yr (2006 2007) measured...
Protected species bycatch can be rare, making it difficult for fishery managers to develop unbiased estimates of fishing-induced mortality. To address this problem, we use Bayesian time-series models estimate the humpback whales ( Megaptera novaeangliae ), which have been documented only twice since 2002 by observers in United States West Coast sablefish pot fishery, once 2014 and 2016. This model-based approach minimizes under- over-estimation associated with using ratio estimators based on...