The ecological division of rivers into 'Dog Rivers' and 'Deer Rivers' directly mapped the Laika's utility onto which specific river systems?
Answer
Kolyma and Indigirka river systems
Early written observations around the mid-1600s documented a practical ecological division used by the local inhabitants regarding resource availability along specific waterways. 'Dog Rivers' were those waters rich enough in fish to consistently sustain the working sled dog teams through continuous fishing. Conversely, 'Deer Rivers' were relied upon when fish stocks were low, requiring the use of reindeer for sustenance or travel assistance. This distinction demonstrates that the working life, feeding requirements, and overall utility of the Laika were intimately mapped onto the resource abundance found specifically along the Kolyma and Indigirka river systems.

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