From Progesterone in Biopsies to Estimates of Pregnancy Rates: Large Scale Reproductive Patterns of Two Sympatric Species of Common Dolphin,Delphinusspp. off California, USA and Baja, Mexico

Autor:	Marisa L. Trego, Susan J. Chivers, Wayne L. Perryman, Nicholas M. Kellar, Fredrick I. Archer
Rok vydání:	2014
Předmět:	Pregnancy biology Common dolphin education Zoology General Medicine General Chemistry Delphinus delphis Pregnancy Status biology.organism_classification medicine.disease Fishery Sympatric speciation Blubber biology.animal medicine Delphinus capensis human activities Delphinus
Zdroj:	Bulletin, Southern California Academy of Sciences. 113:58-80
ISSN:	2162-4534 0038-3872
DOI:	10.3160/0038-3872-113.2.58
Popis:	Blubber progesterone levels were measured in biopsy samples and used to predict the pregnancy status of 507 female common dolphins (204 long-beaked common dolphins, Delphinus capensis, and 303 short-beaked common dolphins, D. delphis). Samples were collected in the coastal waters of the eastern North Pacific between central California, USA and the southern end of Baja California, Mexico. The percentage of females pregnant was similar between the two species: 22.1% (n = 45) of D. capensis and 28.1% (n = 85) of D. delphis. For both species we found strong geographic patterns in pregnancy, suggesting that some areas were more conducive for pregnant females. A sizable drop in percent pregnant from early (38.8%, n = 133) to late (25.3%, n = 91) autumn was found in D. delphis but not in D. capensis. The potential for sample selectivity was examined via biopsies collected either from a large research ship or from a small, rigid-hull inflatable boat (RHIB) launched from the larger ship. An analys...
Databáze:	OpenAIRE
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