کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2847496 1167370 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The energetics of embryonic growth
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی فیزیولوژی
پیش نمایش صفحه اول مقاله
The energetics of embryonic growth
چکیده انگلیسی

Embryos typically operate under much tighter energy constraints than older animals. This has had a profound impact on how energy is stored, mobilized and partitioned. The result is sometimes quite different ways of doing things. Growth, in particular, is a much more important activity during development. Compared with adults, specific growth rates (g) are extremely high (≥150% day−1 for some fish). Production efficiencies are also much higher, particularly for early stages where values of 80–90% are not uncommon. Higher production efficiencies are possible, in part, because of lower unit costs at high g. Unlike in adults, the unit cost of growth does not appear to be fixed during early life. Energy also tends to be partitioned in a different manner, with compensatory partitioning being much more important during early life. Other differences include much higher routine metabolic intensities, smaller aerobic scopes and approximately isometric scaling of routine metabolism. The implications for ontogenetic growth models are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Respiratory Physiology & Neurobiology - Volume 178, Issue 1, 31 August 2011, Pages 22–29
نویسندگان
,