Recent Additions

Ovaries from female shortspine thornyhead (Sebastolobus alascanus) collected in the Aleutian Islands and Gulf of Alaska from 2014 through 2016 were used to investigate aspects of the reproductive biology of this species. Although this species is abundant in both geographical areas, published data on its reproduction remain limited. Ovaries were exa ...

As offshore wind development continues across the globe, accurate spatial data are required to characterize fishing activity, inform wind farm siting decisions, and estimate economic exposure. We assess the influence of fishing behavior and fleet definition within a multispecies fishery on coarse (logbook-based) footprint biases using a precise (GP ...

The collection of imagery for population estimation is rapidly increasing. However, the number of images collected often exceeds the capacity to annotate these images manually. An alternative to human annotations is the use of computer vision to automatically count target organisms. Although the abilities of automated detectors has been considerabl ...

Ecosystem models have been developed to help support Ecosystem-Based Management and to help provide better management advice that can account for ecosystem impacts (e.g., climate, species interactions, fishing behaviour). Quantitative end-to-end models have proven to be very useful strategically for exploring future scenarios, but are data intensiv ...

The white perch, Morone americana, is a widely distributed and ecologically important teleost native to the east coast of North America. Due to its ease of capture and high abundance across a range of ecological conditions, the white perch has been used – and continues to be developed – as a bioindicator of contaminant exposure. Outside of its nati ...

Foraging by deep-diving marine predators is shaped by the interplay between oceanographic features and light-driven (diel and lunar) cycles that structure the three-dimensional distributions of their mesopelagic prey. While mesoscale features such as fronts and eddies are important for epipelagic predators, their role in driving the foraging behavi ...

The Pacific Decadal Oscillation (PDO) has served as a key index linking basin-scale climate variability to marine ecosystem changes in the North Pacific. However, recent apparent breakdowns of PDO–ecosystem correlations have raised concerns about the stability of the mode and its continued relevance in a warming climate. Here we show that basin-wid ...

Close-kin mark-recapture (CKMR) uses data on the frequency of kin pair relationships (e.g., parent-offspring, half-siblings) in genetic samples from animal populations to estimate parameters such as abundance and adult survival probability. To date, most applications of CKMR have relied on a pseudo-likelihood approximation where pairwise comparison ...

Projected increases in temperature and decreases in salinity associated with global climate change will likely have detrimental impacts on eastern oyster, Crassostrea virginica, as these variables can influence physiological processes in these keystone species. We set out to determine how the interactive effects of temperature (20 °C or 27 °C) and/ ...

Elevation of toxic metal mercury (Hg) in coastal waters is influenced by anthropogenic activities, with detrimental impacts on both wildlife and human health (Mason and Gill, 2005; Chen et al., 2012). There are multiple chemical forms of Hg present in the environment, including both inorganic mercury (iHg) and methylmercury (MeHg). While both forms ...

In estuarine food webs, bivalve molluscs transfer nutrients and pollutants to higher trophic levels. Mercury (Hg) pollution is ubiquitous, but it is especially elevated in estuaries historically impacted by industrial activities, such as those in the U.S. Northeast. Monomethylmercury (MeHg), the organic form of Hg, is highly bioaccumulative and tra ...

Climate change is driving a shift in the distribution of global kelp forests, with the contraction of kelp habitats occurring at warm range edges. Declining kelps often have been replaced by novel algal turf assemblages, which are reinforced by ecological feedback mechanisms and provide fewer ecosystem services. Trophic interactions among marine he ...

This work analyzes bifurcation delay and front propagation in the one-dimensional real Ginzburg-Landau equation with periodic boundary conditions on isotropically growing or shrinking domains. First, we obtain closed-form expressions for the delay of primary bifurcations on a growing domain and show that the additional domain growth before the appe ...

Phenotypic plasticity and evolutionary adaptation allow populations to cope with global change, but limits and costs to adaptation under multiple stressors are insufficiently understood. We reared a foundational copepod species, Acartia hudsonica, under ambient (AM), ocean warming (OW), ocean acidification (OA), and combined ocean warming and acidi ...

There are many decisions to be made when sampling for environmental DNA (eDNA) analysis, whether using a targeted, single-species assay or community-based metabarcoding. Of the entire workflow from sampling water to bioinformatic analyses, the first steps in the process of collecting water, filtering it, and preserving the filter membranes represen ...

Recent marine heatwaves in the Gulf of Alaska negatively impacted Pacific cod (Gadus macrocephalus) through a series of failed year classes and poor recruitment to the fishery. Experimental work by Slesinger et al. (2024) corroborated the hypothesis that warming directly impacts recruitment by increasing larval mortality rates. In this companion st ...

Recent developments have allowed state-space assessment models (SSAMs) to incorporate processes such as growth, size-based selectivity and maturity; however, many assessments continue to approximate them as age-based (“age-only” SSAMs). In this study, we use a simulation experiment to evaluate how different factors related to the sampling scheme an ...

A 17-year, replicated, before-after-control-impact experiment involving seven natural steelhead populations from the same geographic region compared three conservation hatchery-supplemented populations to four non-supplemented (control) populations. Spawn timing varied among the populations with the average median spawn day ranging from late Februa ...

Size and hatch date variation among 0-group Pacific cod in the Gulf of Alaska (GOA) has increased following a series of marine heatwaves (2014-16, nicknamed “The Blob”, and 2019) that negatively impacted the fishery. In this study, we used daily otolith increments, whole genome sequencing and fatty acid analyses (FA) to compare two size groups of a ...

Fish in higher latitudes must accumulate sufficient size and energy in fall to survive winters of low productivity. In this study, we measured the growth, condition and survival of age-0 Pacific cod held in the laboratory under varying fall and winter food-temperature scenarios. Individually tagged fish were held for 6 weeks in the fall at either 7 ...