Cuantificación de hormonas 17β - estradiol y progesterona en el caracol rosa Lobatus  gigas (Mollusca, Gastropoda)

Sánchez, Fabiola Chong; Díaz, Martha Enriquez; Aranda, Dalila Aldana

doi:10.15517/rbt.v67i4.34793

Cited by 3 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As such, the number of eggs laid would be an underestimate relative to many areas where the spawning season is more protracted. Simulating only the peak spawning season avoided the need to parameterize increasing concentrations of sex hormones and associated rates of oogenesis with the progression of the spawning season [42] or changes in density and movement rates associated with the formation and dissolution of the aggregation.…”

Section: Discussionmentioning

confidence: 99%

“…This article is a US Government work. It is not subject to copyright under 17 USC 105 parameterize increasing concentrations of sex hormones and associated rates of oogenesis with the progression of the spawning season [42] or changes in density and movement rates associated with the formation and dissolution of the aggregation. This model may also be useful for identifying reference points that avoid recruitment failure.…”

Section: Discussionmentioning

confidence: 99%

“…Because queen conch do not move using a slime trail, it is unclear if scent-trail following is possible for the species. If implicated, it might be accomplished through sex hormone tracking [42]. For most simulations, scent-trail following was disabled.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Farmer

Doerr

2021

Preprint

View full text Add to dashboard Cite

Queen conch are among the most economically, socially, and culturally important fishery resources in the Caribbean. Despite a multitude of fisheries management measures enacted across the region, populations are depleted and failing to recover. It is believed that queen conch are highly susceptible to depensatory processes, impacting reproductive success and contributing to the lack of recovery. We developed a model of reproductive dynamics to evaluate how variations in biological factors such as population density, movement speeds, movement restrictions, rest periods between mating events, sexual facilitation, and perception of conspecifics affect reproductive success and overall reproductive output. We compared simulation results to empirical observations of mating and spawning frequencies from conch populations in the central Bahamas and Florida Keys. Our results confirm that low probability of mate finding associated with decreased population density is the primary driver behind observed breeding behavior in the field, although additional factors also play important roles. In particular, sexual facilitation and perception of conspecifics may explain observed lack of mating at low densities and differences between mating frequencies in the central Bahamas and Florida Keys, respectively. Our simulations suggest densities greater than 200 adults/ha are needed for high levels of spawning output, supporting the suggestion that effective management strategies for queen conch should aim to protect high-density reproductive aggregations and critical breeding habitats.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Farmer

Doerr

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…(c) Quantification of sex steroids in gonads Variations in the reproductive development of mollusks can be evaluated by measuring the levels of steroids (e.g., estradiol and progesterone), as several studies have shown that these hormones play a role in the regulation of invertebrate reproduction processes (Wang and Croll, 2004;Gauthier-Clerc et al, 2006;Croll and Wang, 2007;Lafont and Mathieu, 2007;Chong et al, 2019). The gonad of 20 female F. crassa individuals was carefully examined under a stereomicroscope to confirm the presence and quantity of parasites.…”

Section: Histological and Biochemical Analysis Of Parasitized And Non...mentioning

confidence: 99%

Host-parasite dialogue: fecundity compensation mechanisms of Fissurella crassa

García-Huidobro,

Reyes,

Fuentes

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

Parasites can alter the reproductive performance of their hosts, and to avoid or mitigate the resulting fitness loss, hosts may increase their current reproductive output to compensate for the future loss due to the parasitic infection. Fecundity compensation can be exploited by parasites for their own transmission (exploitation of host compensatory responses by parasites). However, this phenomenon has rarely been reported in second intermediate hosts of trematodes and its mechanisms and consequences largely unexplored. Along the east coast of the South Pacific, the second intermediate host, the mollusk Fissurella crassa, has been observed to display higher muscular foot, greater shell length and weight, and a higher gonadosomatic index when parasitized by metacercariaes of Proctoeces humboldti compared to non-parasitized hosts. In this study, we examined the histology, biochemistry (glucose, lipids, and proteins), and levels of sex hormones (estradiol and progesterone) in both parasitized and non-parasitized female individuals of F. crassa. Our findings revealed that the gonad of parasitized limpets had a higher density of oocytes, but these had a smaller individual area. Additionally, the gonadal tissue of parasitized limpets exhibited lower glucose content but higher lipid content. Notably, the levels of progesterone increased with parasite intensity. These results suggest that F. crassa possesses the ability to compensate for the negative effects of parasites by increasing the number of oocytes through biochemical and hormonal mechanisms. Our study contributes to the limited research on the impact of metacercariae on the reproduction of second intermediate hosts. Furthermore, we discuss how these changes in parasitized limpets could benefit parasite transmission.

show abstract

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Farmer

Doerr

2022

PLoS ONE

View full text Add to dashboard Cite

Queen conch are among the most economically, socially, and culturally important fishery resources in the Caribbean. Despite a multitude of fisheries management measures enacted across the region, populations are depleted and failing to recover. It is believed that queen conch are highly susceptible to depensatory processes, impacting reproductive success and contributing to the lack of recovery. We developed a model of reproductive dynamics to evaluate how variations in biological factors such as population density, movement speeds, rest periods between mating events, scent tracking, visual perception of conspecifics, sexual facilitation, and barriers to movement affect reproductive success and overall reproductive output. We compared simulation results to empirical observations of mating and spawning frequencies from conch populations in the central Bahamas and Florida Keys. Our results confirm that low probability of mate finding associated with decreased population density is the primary driver behind observed breeding behavior in the field, but is insufficient to explain observed trends. Specifically, sexual facilitation coupled with differences in movement speeds and ability to perceive conspecifics may explain the observed lack of mating at low densities and differences between mating frequencies in the central Bahamas and Florida Keys, respectively. Our simulations suggest that effective management strategies for queen conch should aim to protect high-density reproductive aggregations and critical breeding habitats.

show abstract

Cuantificación de hormonas 17β - estradiol y progesterona en el caracol rosa Lobatus gigas (Mollusca, Gastropoda)

Cited by 3 publications

References 26 publications

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Host-parasite dialogue: fecundity compensation mechanisms of Fissurella crassa

Limiting factors for queen conch (Lobatus gigas) reproduction: A simulation-based evaluation

Contact Info

Product

Resources

About