Unilateral Ovariectomy Influences Hypothalamic Monoamine Asymmetries in a Lizard (Anolis) That Exhibits Alternation of Ovulation

Jones, Richard E.; Lopez, Kristin H.; Maldonado, Tammy A.; Summers, Tangi R.; Summers, Cliff H.; Propper, Catherine R.; Woodling, John D.

doi:10.1006/gcen.1997.6982

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…In other Anolis species, unilateral OVX does not detrimentally impact egg production by the remaining ovary (Lovern & Passek ), although it can induce compensatory growth of the contralateral follicle (Jones et al . ). Compensation could offset the expected decrease in reproductive frequency by accelerating folliculogenesis in the remaining ovary.…”

Section: Methodsmentioning

confidence: 97%

Experimentally decoupling reproductive investment from energy storage to test the functional basis of a life‐history trade‐off

Cox

Lovern

Calsbeek

2014

Journal of Animal Ecology

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Summary1. The ubiquitous life-history trade-off between reproduction and survival has long been hypothesized to reflect underlying energy-allocation trade-offs between reproductive investment and processes related to self-maintenance. Although recent work has questioned whether energy-allocation models provide sufficient explanations for the survival cost of reproduction, direct tests of this hypothesis are rare, especially in wild populations.2. This hypothesis was tested in a wild population of brown anole lizards (Anolis sagrei) using a two-step experiment. First, stepwise variation in reproductive investment was created using unilateral and bilateral ovariectomy (OVX) along with intact (SHAM) control. Next, this manipulation was decoupled from its downstream effects on energy storage by surgically ablating the abdominal fat stores from half of the females in each reproductive treatment. 3. As predicted, unilateral OVX (intermediate reproductive investment) induced levels of growth, body condition, fat storage and breeding-season survival that were intermediate between the high levels of bilateral OVX (no reproductive investment) and the low levels of SHAM (full reproductive investment). 4. Ablation of abdominal fat bodies had a strong and persistent effect on energy stores, but it did not influence post-breeding survival in any of the three reproductive treatments. This suggests that the energetic savings of reduced reproductive investment do not directly enhance post-breeding survival, with the caveat that only one aspect of energy storage was manipulated and OVX itself had no overall effect on post-breeding survival. 5. This study supports the emerging view that simple energy-allocation models may often be insufficient as explanations for the life-history trade-off between reproduction and survival.

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Section: Methodsmentioning

confidence: 97%

Experimentally decoupling reproductive investment from energy storage to test the functional basis of a life‐history trade‐off

Cox

Lovern

Calsbeek

2014

Journal of Animal Ecology

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“…As brain NE, DA, and 5-HT systems have been demonstrated to influence gonadal function in reptiles (Jones et al, 1990;Jones et al, 1997;Desan et al, 1992), it is likely that stressor-induced changes in these neurotransmitter systems also affect reproductive processes. In female A. carolinensis, the stress associated with social interactions diminished telencephalic serotonergic and dopaminergic activity but elevated brainstem serotonergic activity, suggesting negative feedback in the 5-HT system, probably at the raphe nucleus .…”

Section: Neurotransmittersmentioning

confidence: 99%

Stress and Reproduction in Reptiles

Tokarz

Summers

2011

Hormones and Reproduction of Vertebrates

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“…More recent laboratory work suggests that eggs can be laid as frequently as every seven days (Lovern et al, 2004a). Removal of one ovary in green anoles causes compensatory follicular development on the other side and influences hypothalamic catecholamine asymmetries, likely through both neural and hormonal signals (Jones et al, 1997). Removal of one ovary in green anoles causes compensatory follicular development on the other side and influences hypothalamic catecholamine asymmetries, likely through both neural and hormonal signals (Jones et al, 1997).…”

Section: Hormonal Control Of Anole Reproductionmentioning

confidence: 99%