Heart rate v pace

I've spotted on my long runs that if I run to a steady heart rate, my pace (not unreasonably) drops off - especially after a dozen or so miles. I'm interested to know what the physiological reason is - is it to do with scraping the glycogen barrel, or deterioration of my running style (& efficiency), or dehydration, or what? And in a marathon, is it better to maintain a steady pace (as I'm given to believe) or constant HR (does this equate to constant effort?)? I don't intend to race with an HRM, by the way, just train.

Thanks, you lovely lot.

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