Relationships of basal metabolic rate, relative testis size and cycle length of spermatogenesis in shrews (Mammalia, Soricidae)

摘要: The aim of the present study was to determinate cycle length spermatogenesis in three species shrew, Suncus murinus, Sorex coronatus and minutus, assess relative influence variation basal metabolic rate (BMR) mating system (level sperm competition) on observed spermatogenesis, including data shrew studied before (Sorex araneus, Crocidura russula Neomys fodiens). dynamics production were determined by tracing 5-bromodeoxyuridine DNA germ cells. As a continuous scaling systems is not evident, level competition evaluated significantly correlated testis size (RTS). durations estimated linear regression 14.3 days (RTS 0.3%) 9.0 0.5%) 8.5 2.8%) minutus. In multiple analyses all six with BMR (r2 = 0.73) RTS 0.77). Sperm as an ultimate factor obviously leads reduction time order increase production. may act same way, independently or proximate factor, revealed covariation, but other factors (related testes thus system) also be involved.