By Blaine Harden
After twenty years, Washington Post journalist Blaine Harden back to his small-town birthplace within the Pacific Northwest to stick with the increase and fall of the West’s such a lot completely conquered river. To discover the Columbia River and befriend those that collaborated in its destruction, he traveled on a big freight barge crusing west from Idaho to the Grand Coulee Dam, the location of the river’s harnessing for the sake of jobs, electrical energy, and irrigation. A River Lost is a searing own narrative of rediscovery joined with a story of exploitation: of local american citizens, of endangered salmon, of nuclear waste, and of a once-wild river. up-to-date all through, this variation incorporates a new foreword and afterword.
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Additional resources for A River Lost: The Life and Death of the Columbia
Whether or not you call these molecules pheromones will depend on whether the ﬁrst male’s molecules have evolved for this function. All biological systems are evolving, so for a given species we may be at any point on the continuum from cue to signal. 4). However, for molecules to be treated as a signal under the “operational deﬁnition,” there also needs to be a credible evolutionary pathway by direct or kin selection. For example, ﬁsh have evolved sensitive responses to molecules released when other ﬁsh are injured by predators.
2009). In these Heliothis species, quantitative trait locus (QTL) studies showed genes on at least 9 of the 31 Heliothis chromosomes contribute to the pheromone differences between the species, which may also involve genes other than those encoding the enzymes themselves. The change leading to the Asian cornborer, O. nubilalis, pheromone has been called a “saltational” shift, and it has been suggested that “sudden major switches in pheromone blend and male response appear more likely than accumulation of small changes” (Roelofs et al.
However, for molecules to be treated as a signal under the “operational deﬁnition,” there also needs to be a credible evolutionary pathway by direct or kin selection. For example, ﬁsh have evolved sensitive responses to molecules released when other ﬁsh are injured by predators. However, these molecules are probably alarm cues rather than an evolved signal as the responding ﬁsh are unlikely to be kin and may even be from a different species (Chapter 8) (Ferrari et al. 2010; Wisenden 2013). 4 Pheromone characteristics, transmission medium, and signal duration Whether pheromones evolve from sender precursors or are derived from receiver sensory bias, which molecules become pheromones is also a product of the function of the message, as well as the medium the message will be carried in.
A River Lost: The Life and Death of the Columbia by Blaine Harden