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• W2090095905 abstract "Assessing reproductive status and monitoring reproductive rates is important in the effective management of vulnerable marine mammal species such as the dugong (Dugong dugon). Knowledge of the reproductive physiology of this species is limited, and determining reproductive parameters (e.g., sexual maturation, pregnancy, and reproductive senescence) has been restricted by a lack of non-lethal methods for assessing reproductive status in free-ranging individuals. The aim of this study was to develop a method to identify pregnant individuals in a wild dugong population. Using an enzymeimmunoassay, we quantified concentrations of fecal progesterone metabolites (fP) in 322 dugongs, including confirmed pregnant females (n = 10), presumed non-pregnant adult females (n = 25), juvenile females (n = 24), subadult females (n = 41), adult females of unknown pregnancy state (n = 63), and males of all sizes (n = 159). External body morphometrics of each dugong were measured, and confirmation of pregnancy in adult female dugongs was determined by ultrasonography or observation of subsequent neonates. Concentrations of fP were different between sexes and reproductive size classes (P < 0.001), and ∼30-fold higher in confirmed pregnant dugongs (2017–7760 ng/g) compared to presumed non-pregnant females (30–221 ng/g), juvenile females (29–195 ng/g), and males (24–261 ng/g) (P < 0.001). Body measures of maximum and anal girths, and teat length were all greater in confirmed pregnant females than presumed non-pregnant females (all P < 0.05). We evaluated a Discriminant Function Analysis (DFA) to provide a model for predicting pregnant and non-pregnant dugongs. Cross-validated results showed that the DFA correctly classified 100% of pregnant and non-pregnant females using fP concentrations, body length, fineness ratio (an index of body shape), and teat length (a female reproductive trait). Using the DFA model, we classified the pregnancy status of all female dugongs and identified a total of 30 females as pregnant and 133 females as non-pregnant from the sampled population over the sample period. Pregnant dugongs in the Moreton Bay population are characterized by fecal progesterone metabolite concentrations > 1000 ng/g, body length ⩾ 260 cm, maximum girth ⩾ 215 cm, anal girth ⩾ 126 cm, and teat length ⩾ 5 cm long. In summary, analysis of fP concentrations in combination with body morphometrics may be used to diagnose pregnancy in free-ranging dugongs, and provides a new tool to monitor breeding rates of wild sirenian populations." @default.
• W2090095905 created "2016-06-24" @default.
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• W2090095905 date "2012-05-01" @default.
• W2090095905 modified "2023-09-27" @default.
• W2090095905 title "Diagnosing pregnancy in free-ranging dugongs using fecal progesterone metabolite concentrations and body morphometrics: A population application" @default.
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• W2090095905 doi "https://doi.org/10.1016/j.ygcen.2012.02.008" @default.
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