By Ruth Padel
“Life all started with migration.” In a powerful tapestry of lifestyles at the flow, Ruth Padel weaves poems and prose, technology and faith, wild nature and human heritage, to conjure an international created and sustained by means of migration.
'We're all from someplace else,' she starts. “Migration builds civilization but in addition reasons displacement.” From the Holy Family’s Flight into Egypt, the misplaced Colony on Roanoke and the well-known picture ‘Migrant Mother’, she turns to John James Audubon’s trip from Haiti and France, heirlooms carried via Ellis Island, Kennedy’s “society of immigrants” and Casa del Migrante at the Mexican border.
But she reaches the human tale throughout the millennia-old trips of cells in bodies, bushes within the Ice Age, Monarch butterflies vacationing from Alaska to Mexico. As warblers conflict hurricanes over the Caribbean and wildebeest courageous a river jam-packed with the biggest crocodiles in Africa, she exhibits that the aim of migration for either people and animals is survival.
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Extra info for On Migration: Dangerous Journeys and the Living World
In such situations, weak or undetectable seasonal pulses of nutrient injection, of phyto plankton growth, and of secondary production make it very difficult to isolate the processes of autotrophic fixation of carbon from those of heterotrophic con sumption. Within a boreal oceanic ecosystem, such as the subarctic North Pacific at 50°N, the interaction of phytoplankton and the herbivores should be uncoupled seasonally, since there is a light pulse in the spring. After 30 yr of observations near Station P at 50°N, 145°W, however, little seasonality of chlorophyll biomass is evident (Fig.
However, a seasonal maximum of dry weight of nanoplankton, the dominant organisms (Miller and Moore, 1953), was instead observed in summer during a second study (Bsharah, 1957), while seasonal maxima of algal cell numbers were found during spring in a third study (Vargo, 1968). 5 Food Web Coupling 51 time scales, that is, unresolved, or aliased, by the above three sampling plans of monthly intervals. Farther to the north, at the edge of the Florida-Georgia shelves between 29 and 32°N, spin-off eddies of the same Gulf Stream, in fact, upwell more than 10 /xg-at.
The impact of the summer rainy season is again manifested in both low salinity at the 20-m isobath (Fig. 17), and nitrate concentrations of 5-10 μg-at. N 0 3 Γ 1 (Bainbridge, 1960; Watts, 1958), which should induce a July-August bloom of phytoplankton, as occurs at about the same latitude off the Malabar coast (Fig. 13). Ubiquitous cloud cover during the rainy season off Sierra Leone reduces the incident radiation, however, to 69 g-cal cm - 2 day - 1 in July-August, from a maximum of 480 g-cal cm - 2 day~l in February (Longhurst, 1983), which is an 86% reduction—recall that the spring bloom off New York began at —250 g-cal cm - 2 day -1 .