Comparative metabolism of gestagens and estrogens in the four lynx species, the Eurasian (Lynx lynx), the Iberian (L. pardinus), the Canada lynx (L. canadensis) and the bobcat (L. rufus)

Dehnhard, Martin; Fanson, Kerry V.; Frank, Anna-Simone; Найденко, С. В.; Vargas, Astrid; Jewgenow, Katarina

doi:10.1016/j.ygcen.2010.03.023

Cited by 31 publications

(19 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Estrogens (E2), P4 and the prostaglandin F2α metabolite (PGFM) were analyzed in serum samples using in-house enzyme immunoassays [21], [22]. These assays have been previously validated for lynx [7], [21], [22].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) – Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam

et al. 2014

View full text Add to dashboard Cite

Felids generally follow a poly-estrous reproductive strategy. Eurasian lynx (Lynx lynx) display a different pattern of reproductive cyclicity where physiologically persistent corpora lutea (CLs) induce a mono-estrous condition which results in highly seasonal reproduction. The present study was based around a sono-morphological and endocrine study of captive Eurasian lynx, and a control-study on free-ranging lynx. We verified that CLs persist after pregnancy and pseudo-pregnancy for at least a two-year period. We could show that lynx are able to enter estrus in the following year, while CLs from the previous years persisted in structure and only temporarily reduced their function for the period of estrus onset or birth, which is unique among felids. The almost constant luteal progesterone secretion (average of 5 ng/ml serum) seems to prevent folliculogenesis outside the breeding season and has converted a poly-estrous general felid cycle into a mono-estrous cycle specific for lynx. The hormonal regulation mechanism which causes lynx to have the longest CL lifespan amongst mammals remains unclear. The described non-felid like ovarian physiology appears to be a remarkably non-plastic system. The lynx's reproductive ability to adapt to environmental and anthropogenic changes needs further investigation.

show abstract

Section: Methodsmentioning

confidence: 99%

“…These assays have been previously validated for lynx [7], [21], [22]. The inter-assay coefficients of variation (CVs) when measuring PGFM in plasma samples were determined by repeated analyses of two pools containing 0.94 ng/mL and 3.3 ng/mL of PGFM and were 9.0 and 9.8%, respectively (n = 10).…”

Section: Methodsmentioning

confidence: 99%

Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) – Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Because a previous study on female capuchins showed that estrogen profiles appeared to match those of progestogens, and because no clear pre-ovulatory estrogen peak was detectable in fecal samples of cycling animals (Carosi et al, 1999), the timing of ovulation was solely based on progestogen measurements. Fecal extracts were diluted 1:150 to 1:2000 (depending on concentration) with assay buffer before being measured by EIA as described by Dehnhard et al (2010). Sensitivity of the assay at 90% binding was 2.4 pg.…”

Section: Fecal Sample Collection Hormone Analysis and Assessment Ofmentioning

confidence: 99%

Female behavioral proceptivity functions as a probabilistic signal of fertility, not female quality, in a New World primate

Tiddi

Wheeler

Heistermann

2015

Hormones and Behavior

View full text Add to dashboard Cite

The interests of males and females in mating contexts often conflict, and identifying the information conveyed by sexual signals is central to understanding how signalers manage such conflicts. Research into the information provided by female primate sexual signals has focused on exaggerated anogenital swellings as either reliable-indicators of reproductive quality (reliable-indicator hypothesis) or probabilistic signals of fertility (graded-signal hypothesis). While these morphological signals are mostly confined to catarrhine primates, these hypotheses are potentially widely applicable across primates, but have not been tested in taxa that lack such morphological signals. Here, we tested these hypotheses in wild black capuchins (Sapajus nigritus), a species in which females lack morphological sexual signals but produce conspicuous behavioral estrous displays. Specifically, we examined the proportion of time different females spent producing these signals with respect to measures of female quality (dominance rank, parity, age-related fecundity and cycle type) and in relation to the timing of fertility, as determined by analysis of fecal progesterone. Time spent displaying did not vary across females based on measures of female quality, but increased with the approach of ovulation. Further, male mating effort varied according to the timing of female fertility. Proceptive behaviors in this species thus meet predictions of the graded-signal hypothesis, providing the first support for this hypothesis based solely on behavioral signals.

show abstract

“…The Eurasian lynx (Lynx lynx) is one of four species within the genus Lynx; the other three are the Canadian lynx (Lynx canadiensis), the bobcat (Lynx rufus) and the critically endangered Iberian lynx (Lynx pardinus; Dehnhard et al 2010). The lynx genus typically consists of strictly seasonal breeders; the exception being the bobcat, which is a non-seasonal polyoestrous breeder (Parker & Smith 1983, Kvam 1991, Hayssen et al 1993.…”

Section: Introductionmentioning

confidence: 99%

Histological and endocrine characterisation of the annual luteal activity in Eurasian lynx (Lynx lynx)

et al. 2012

View full text Add to dashboard Cite

Lynx presents a unique sexual cycle with persistent corpora lutea (CLs) and elevated serum progesterone (P 4 ) throughout parturition and lactation. In other mammals, CLs normally disintegrate after parturition, therefore the aim of our study was to characterise the annual life cycle of lynx CLs. Ovaries from Eurasian lynxes were obtained from the National Veterinary Institute in Sweden, where tissues from killed lynx were stored at K20 8C. Ovaries from 66 animals were weighed; each corpus luteum was segmented for histology and hormone analysis. Ovary and CLs weights were constant throughout the year, peaking during pregnancy. In non-pregnant lynxes, the seasonal level of intraluteal steroids was steady for P 4 (3.2G1.9 S.D. mg/g, nZ53) and total oestrogens (18.3G15.5 S.D. ng/g, nZ53). Within histology slides, structurally intact luteal cells were found throughout the year with the highest incidence in March/April; evidence of luteal regression was predominantly found in post-breeding season. Ovaries from pregnant animals contained two types of CLs. Group A was bigger in size with large luteal cells (P 4 , 72.3G65.4 S.D. mg/g; oestrogen, 454.0G52.4 S.D. ng/g). In contrast, group B were smaller, with greater luteal regression and lower steroid concentrations (P 4 , 8.3G2.9 S.D. mg/g; oestrogen, 31.5G20.4 S.D. ng/g). Our results suggest that structural luteolysis proceeds throughout the year and into next breeding cycle, resulting in two CLs types on the same ovary.

show abstract

Comparative metabolism of gestagens and estrogens in the four lynx species, the Eurasian (Lynx lynx), the Iberian (L. pardinus), the Canada lynx (L. canadensis) and the bobcat (L. rufus)

Cited by 31 publications

References 31 publications

Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) – Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam

Physiologically Persistent Corpora lutea in Eurasian Lynx (Lynx lynx) – Longitudinal Ultrasound and Endocrine Examinations Intra-Vitam

Female behavioral proceptivity functions as a probabilistic signal of fertility, not female quality, in a New World primate

Histological and endocrine characterisation of the annual luteal activity in Eurasian lynx (Lynx lynx)

Contact Info

Product

Resources

About