Signals of heterogeneous selection at an MHC locus in geographically proximate ecotypes of sockeye salmon.
Mol Ecol. 2014 Oct 5;
Authors: Larson WA, Seeb JE, Dann TH, Schindler DE, Seeb LW
The genes of the major histocompatibility complex (MHC) are an important component of the vertebrate immune system and can provide insights into the role of pathogen-mediated selection in wild populations.
Growth and survival of pacific coho salmon smolts exposed as juveniles to pesticides within urban streams in western Washington, USA.
Environ Toxicol Chem. 2014 Jul;33(7):1596-606
Authors: King KA, Grue CE, Grassley JM, Fisk RJ, Conquest LL
Pesticides are frequently detected in urban streams, with concentrations often exceeding those reported in surface waters within agricultural areas. The authors studied growth, survival, and return rates of coho salmon (Oncorhynchus kisutch) smolts exposed to a pesticide mixture (“cocktail”) representative of the pesticides most frequently reported within urban streams in western Washington State, USA, in fall through early spring.
Latitudinal and photic effects on diel foraging and predation risk in freshwater pelagic ecosystems.
J Anim Ecol. 2014 Sep 29;
Authors: Hansen AG, Beauchamp DA
1. Clark & Levy (1988) described an antipredation window for smaller planktivorous fish during crepuscular periods when light permits feeding on zooplankton, but limits visual detection by piscivores. Yet, how the window is influenced by the interaction between light regime, turbidity and cloud cover over a broad latitudinal gradient remains unexplored.
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
View full textDownload full text
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.