the strength of thisselection pressure on dispersal traits is almost unknown in thewild because of the difficulties of measuring it in natural systems.
suggesting why modeling is necessary?
221 Matching Annotations
- Oct 2020
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drive.google.com drive.google.com
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Third, by using a quantitative geneticmodel, we estimated that the pattern is consistent with short-termevolution that occurs over5–12 generations of selection, whichis generated by a high cost of dispersal in urban populations.
Model evaluates speed of genetic change
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econd, we showed that the propor-tion of nondispersing seeds in urban patches measured in acommon environment is significantly higher than in surrounding,unfragmented populations.
Confirms genetic change in urban plants
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First, we showed that, in urban patches, dispersingseeds have a 55% lower chance of settling in their patch comparedwith nondispersing seeds and, thus, fall on a concrete matrixunsuitable for germination.
natural selection works against dispersing seeds
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www.mckinsey.com www.mckinsey.com
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PCI,
pulverized coal injection
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the photic zone, the intertidal zone, the neritic zone, and the oceanic zone
my answer choice
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Marine organisms are surrounded by water with a higher solute concentration than the organism and, thus, are in danger of losing water to the environment because of osmosis.
Confusing. Why then do they expel solutes, increasing chemical gradient?
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are tended by ants
amazing!
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biochemistry, physiology, evolution, biodiversity, molecular biology, geology, and climatology. Some ecological research also applies aspects of chemistry and physics, and it frequently uses mathematical models.
interdisciplinary
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www.pnas.org www.pnas.org
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Fe mobilization on the continental margin by microbial dissimilatory iron reduction (DIR)
Mobilization here means dissolution, I think. And again, we can try to get away with not knowing exactly what DIR means except that it involves the reduction (addition of an electron) to iron through the metabolic activity of microbes.
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High-εNd and -δ56Fe signatures in some BIF samples record a hydrothermal component, but correlated decreases in εNd- and δ56Fe values reflect contributions from a continental component.
The notation of isotopic measurements is a bit technical. For now, just think of them as simple numbers, analogous to something you might measure in your body like temperature or blood pressure. Those measurements tell you something important about your body. These isotopic measurements tell us something important about the material measured.
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2.5 billion y ago
Now Precambrian is suitably narrowed down.
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two sources of Fe
and if we look ahead, they are described as hydrothermal and continental.
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sources and pathways for metals in BIFs
where did the iron originate? how did it get to the depositional site?
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Precambrian
Technically all time before 543 Ma but we should learn later that BIFs are more restricted in their ages.
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- Sep 2020
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eportfolios.macaulay.cuny.edu eportfolios.macaulay.cuny.edu
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minimum mass for enough gravity to hold an atmosphere
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so moon could be habitable instead of planet
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eyes on a single spot, producing huge amount of data
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- Aug 2020
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advances.sciencemag.org advances.sciencemag.org
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pyroxenite
wait--how can pyroxenite be MORB- or OIB-like? Guess I have to look at 11-12, NUTS.
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depleted (D-MORBs)
do these have even lower LREE's than N-MORB?
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DMM produces MORBs
OK, MORB comes from depleted mantle, which is why it typically has LREE abundances that are below chondrites? or is it primitive mantle? I forgot the standard.
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