Can intense predation by bears exert a depensatory effect on recruitment in a Pacific salmon population?
Oecologia. 2014 Aug 26;
Authors: Quinn TP, Cunningham CJ, Randall J, Hilborn R
It has long been recognized that, as populations increase in density, ecological processes affecting growth and survival reduce per capita recruitment in the next generation. In contrast to the evidence for such “compensatory” density dependence, the alternative “depensatory” process (reduced per capita recruitment at low density) has proven more difficult to demonstrate in the field.
Resource competition induces heterogeneity and can increase cohort survivorship: selection-event duration matters.
Oecologia. 2013 Dec;173(4):1321-31
Authors: Gosselin JL, Anderson JJ
Determining when resource competition increases survivorship can reveal processes underlying population dynamics and reinforce the importance of heterogeneity among individuals in conservation. We ran an experiment mimicking the effects of competition in a growing season on survivorship during a selection event (e.g., overwinter starvation, drought).
Climate change poised to threaten hydrologic connectivity and endemic fishes in dryland streams.
Proc Natl Acad Sci U S A. 2014 Aug 18;
Authors: Jaeger KL, Olden JD, Pelland NA
Protecting hydrologic connectivity of freshwater ecosystems is fundamental to ensuring species persistence, ecosystem integrity, and human well-being. More frequent and severe droughts associated with climate change are poised to significantly alter flow intermittence patterns and hydrologic connectivity in dryland streams of the American Southwest, with deleterious effects on highly endangered fishes.
Differential growth in estuarine and freshwater habitats indicated by plasma IGF1 concentrations and otolith chemistry in Dolly Varden Salvelinus malma.
J Fish Biol. 2014 Aug 12;
Authors: Bond MH, Beckman BR, Rohrbach L, Quinn TP
This study employed a combination of otolith microchemistry to indicate the recent habitat use, and plasma concentrations of the hormone insulin-like growth factor 1 (IGF1) as an index of recent growth rate, to demonstrate differences in growth and habitat use by Dolly Varden Salvelinus malma occupying both freshwater and estuarine habitats in south-west Alaska.
Comparative genome mapping between Chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (O. mykiss) based on homologous microsatellite loci.
G3 (Bethesda). 2013 Dec;3(12):2281-8
Authors: Naish KA, Phillips RB, Brieuc MS, Newton LR, Elz AE, Park LK
Comparative genome mapping can rapidly facilitate the transfer of DNA sequence information from a well-characterized species to one that is less described. Chromosome arm numbers are conserved between members of the teleost family Salmonidae, order Salmoniformes, permitting rapid alignment of large syntenic blocks of DNA between members of the group.
Effects of Seawalls and Piers on Fish Assemblages and Juvenile Salmon Feeding Behavior
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Stuart H. Munscha*, Jeffery R. Cordella, Jason D. Tofta & Erin E. Morgana
Publishing models and article dates explained
Received: 27 Dec 2013
Accepted: 27 Mar 2014
Published online: 10 Jul 2014
Shoreline modifications, such as seawall armoring and piers, are ubiquitous along developed waterfronts worldwide, and recent research suggests that their ecological effects are primarily negative.Read more
Evolutionary rescue in a changing world.
Trends Ecol Evol. 2014 Jul 15;
Authors: Carlson SM, Cunningham CJ, Westley PA
Evolutionary rescue occurs when adaptive evolutionary change restores positive growth to declining populations and prevents extinction. Here we outline the diagnostic features of evolutionary rescue and distinguish this phenomenon from demographic and genetic rescue. We then synthesize the rapidly accumulating theoretical and experimental studies of evolutionary rescue, highlighting the demographic, genetic, and extrinsic factors that affect the probability of rescue.
Histopathologic alterations associated with global gene expression due to chronic dietary TCDD exposure in juvenile zebrafish.
PLoS One. 2014;9(7):e100910
Authors: Liu Q, Spitsbergen JM, Cariou R, Huang CY, Jiang N, Goetz G, Hutz RJ, Tonellato PJ, Carvan MJ
The goal of this project was to investigate the effects and possible developmental disease implication of chronic dietary TCDD exposure on global gene expression anchored to histopathologic analysis in juvenile zebrafish by functional genomic, histopathologic and analytic chemistry methods.
Genome-wide profiling of DNA methylation and gene expression in Crassostrea gigas male gametes.
Front Physiol. 2014;5:224
Authors: Olson CE, Roberts SB
DNA methylation patterns and functions are variable across invertebrate taxa. In order to provide a better understanding of DNA methylation in the Pacific oyster (Crassostrea gigas), we characterized the genome-wide DNA methylation profile in male gamete cells using whole-genome bisulfite sequencing.
Estimating Historical Eastern North Pacific Blue Whale Catches Using Spatial Calling Patterns.
PLoS One. 2014;9(6):e98974
Authors: Monnahan CC, Branch TA, Stafford KM, Ivashchenko YV, Oleson EM
Blue whales (Balaenoptera musculus) were exploited extensively around the world and remain endangered. In the North Pacific their population structure is unclear and current status unknown, with the exception of a well-studied eastern North Pacific (ENP) population.