Life history of the cownose ray, Rhinoptera bonasus, in the northern Gulf of Mexico, with comments on geographic variability in life history traits

Neer, Julie A.; Thompson, Bruce

doi:10.1007/s10641-005-2136-5

Cited by 115 publications

(106 citation statements)

References 21 publications

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“…reproductiove symetry observed in the common eagle ray Myliobatis aquila (Capapé et al 2007)], is very widespread in Myliobatiformes. Most species show reproductive asymmetry related to development and functionality of ovaries and uteri (Hamlett et al 1985;Smith & Merriner 1986;Johnson & Snelson 1996;White et al 2001;Neer & Thompson 2005). Although both ovaries and uteri are functional in some species, asymmetric fertility and fecundity has been observed (Babel 1967;Charvet-Almeida et al 2005;Fahy et al 2007) and even the bat ray Myliobatis californica has a nearly non-functional right ovary but fully functioning right and left uterus (Martin & Cailliet 1988).…”

Section: Discussionmentioning

confidence: 99%

Uterine dynamics of the southern eagle rayMyliobatis goodei(Chondrichthyes: Myliobatidae) from the southwest Atlantic Ocean

Colonello

Christiansen

Cousseau

et al. 2013

Italian Journal of Zoology

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Uterine layer changes and their relationship with the reproductive cycle were analyzed for the southern eagle ray Myliobatis goodei (Chondrichthyes: Myliobatidae), based on histological and histometric studies. The specimens were collected from bottom-trawl surveys conducted in the coastal southwest Atlantic ecosystem between latitude 34 and 42 • S. Oviduct samples were removed and fixed in 10% buffered formalin until processing for histological analysis. Both oviducts are developed in mature females, but only the left is functional. After ovulation, the size of the right posterior oviduct decreases and the left develops into a complex uterus that occupies almost the entire coelomic cavity. This uterus undergoes successive morphological and functional changes related to reproductive stages. Mucosa was characterized by temporal villous extensions or trophonemata with high variability depending on reproductive events. Invaginations or crypts associated with presumably lipid secretion (histotrophe) were observed between the trophonematum bases. The muscular layer develops into a complex muscular-vascular-conjunctive structure. The nutrition of early-gestation embryos is lecithotrophic and later they receive nutrients from the yolk sac and histotrophe. After yolk depletion, embryos become entirely dependent on histotrophe. Uterolactation, presumptive water imbibition of the muscular layer, and uterine hypertrophy observed in this study reinforce the "similarities" between Myliobatiformes and mammals.

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Section: Discussionmentioning

confidence: 99%

Uterine dynamics of the southern eagle rayMyliobatis goodei(Chondrichthyes: Myliobatidae) from the southwest Atlantic Ocean

Colonello

Christiansen

Cousseau

et al. 2013

Italian Journal of Zoology

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show abstract

“…Cownose rays in the northern Gulf of Mexico exhibit a K-selected life history (Neer & Thompson 2005). Verified age estimates indicate that cownose rays live in nature for at least 18 yr, with a predicted theoretical longevity of 26 yr. Fifty percent of the cownose ray population reaches maturity at age 4 to 5 yr (~4.6 to 4.9 kg weight wet [ww]).…”

Section: Abstract: Cownose Ray · Bioenergetics · Matrix Model · Popumentioning

confidence: 96%

“…i.e. C F = 6390/1415 = 4.516 ⎫ ⎬ ⎭ individuals at that age to body weight (Neer & Thompson 2005). If the random number drawn from a uniform distribution was smaller than the fraction mature based on an individual's weight on May 15 of the previous year, then the individual would reproduce in the current year.…”

Section: Growthmentioning

confidence: 99%

“…We used the weight from the previous year to mimic the 12 mo gestation period. The reproductive event was modeled by the loss of 777 g ww on May 15, representing the average birth weight of one pup (Neer & Thompson 2005).…”

Section: Growthmentioning

confidence: 99%

“…Initial weights (g ww) were generated from a normal distribution with a mean of 777 g ww and a standard deviation of 171 g ww. Minimum (500 g ww) and maximum (1000 g ww) initial weights were imposed to ensure realistic initial weights based on observed weight-at-birth information (Neer & Thompson 2005).…”

Section: Growthmentioning

confidence: 99%

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