Período reprodutivo de Ucides cordatus (Linnaeus) (Brachyura, Ocypodidae) na Baía das Laranjeiras, sul do Brasil

Análises macroscópica e microscópica das gônadas de Ucides cordatus foram realizadas mensalmente, durante um ano, visando determinar o período reprodutivo da espécie. A coleta dos espécimes foi realizada em duas ilhas no Sul do país, que apresentaram salinidades diferentes. Os dados obtidos apresentaram consonância com as informações existentes para a espécie no Nordeste brasileiro, possibilitando inferir que variações geográficas e em salinidade parecem não influenciar o período reprodutivo de U. cordatus. Para as fêmeas, foram identificados três estágios de desenvolvimento gonadal: em maturação, maturo e desovado. Fêmeas em maturação foram registradas de agosto a setembro, enquanto as maturas ocorreram de outubro a abril e as desovadas de dezembro a agosto. Os machos foram classificados em duas categorias: gônadas cheias, encontradas durante todo o período de estudo; e gônadas vazias, registradas de dezembro a abril. O contraste da condição gonadal dos machos e das fêmeas possibilitou a determinação do período reprodutivo da espécie na Baía das Laranjeiras, que ocorreu de dezembro a abril. Reproductive period of Ucides cordatus (Linnaeus) (Brachyura, Ocypodidae) in Laranjeiras Bay, southern Brazil Abstract Histological and macroscopic analyses of the gonads of Ucides cordatus were used to determine the reproductive period of the species. The specimens were collected monthly, during one year, in two islands located in the Laranjeiras Bay, Southern Brazil. The obtained data were similar for the two islands and they showed consonance with the information for the species in the Brazilian Northeast. Three stages of gonadal development were identified for the females: in maturation (registered from August to September), mature (registered from October to April) and spawned (registered from December to August). The males were classified in two categories: full gonads, found during the whole study period; and empty gonads, registered from December to April. The contrast of the gonadal condition between males and females allows to determine the reproductive period, which occurs from December to April in Laranjeiras Bay. Résumé Des analyses macroscopiques et microscopiques de Ucides cordatus ont été réalisées mensuellement pendant une année, em envisageant déterminer la période reproductive de lespèce. La collecte des espècemenes a été réalisée em deux îles (Peças et Pavoçá) qui présentaient des salinités différentes. Les données obtenues ont presente consonance aux renseignements existants pour lespéce du Nort-est brésilien em rendant possible infere que les variations geographiques et em salinité semblent ne pás influencer la ériode reproductive de U. cordatus. Pour lês femelles, ont été identifiés trois stages de développement dês gonades: en maturation, mature et frayé. Des femelles en maturation ont été enregistrées daoût à septembre, tandis que celles matures lont été doctobre à avril et celles frayées de décembre à août. Les mâles ont été classés em deux catégories: gonades pleines trovées pendant toute la période détude,, et gonades vides, enregistrées de décembre à avril. Le contraste de la condition dês gonades des mâles et des femelles a rendu possible la détermination de la période reproductive de lespèce dans la Baia das Laranjeiras, qui a eu lieu entre décembre et avril.

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Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132005000100018 ◽

2005 ◽

Vol 48 (1) ◽

pp. 139-145 ◽

Cited By ~ 23

Author(s):

Glaucia Dalabona ◽

Jayme de Loyola e Silva ◽

Marcelo Antonio Amaro Pinheiro

Keyword(s):

Sexual Dimorphism ◽

Sexual Maturity ◽

Carapace Length ◽

Carapace Width ◽

Southern Brazil ◽

Monthly Basis ◽

Ucides Cordatus ◽

Size At Sexual Maturity ◽

Males And Females ◽

One Year

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

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Population structure of Sinelobus cf. stanfordi (Crustacea, Tanaidacea) from Pinheiros River mangrove, Guaratuba Bay, southern Brazil

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315416000242 ◽

2016 ◽

Vol 97 (2) ◽

pp. 243-247

Author(s):

A. D. Kassuga ◽

A. Marafon-Almeida ◽

S. Masunari

Keyword(s):

Population Structure ◽

Carapace Length ◽

Reproductive Period ◽

Southern Brazil ◽

Ucides Cordatus ◽

Temporal Fluctuations ◽

Mangrove Crab ◽

Sexually Mature

An analysis of the population structure of the tanaid Sinelobus cf. stanfordi was performed at Pinheiros River mangrove, Guaratuba Bay, Paraná State, southern Brazil (25°49′S 48°34′W). Fifteen samples of 12 × 12 cm were obtained bimonthly from the surface of galleries (interconnected burrow complex) constructed by the adult mangrove crab Ucides cordatus from June 2007 to April 2008. The carapace length (CL) of a total of 714 tanaids was measured. Tanaids were divided into four demographic categories: males (M), ovigerous females (OV), preparatory females (PREP) and non-reproductive individuals (NREP) with a mean CL of 0.55, 0.49, 0.48 and 0.43 mm, respectively. In the NREP group, specimens smaller than 0.32 mm were classified as juveniles. NREP predominated in all sampling months, and among sexually mature individuals, a strong predominance of females was observed throughout the study period. Temporal fluctuations in abundance were observed, with a peak in August 2007. The reproductive period of this species is continuous, with a peak in the summer, like most S. cf. stanfordi populations.

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Annual gonadal and adrenal cycles in the Eastern Rosella, Platycerus eximius, (Psittaciformes : Platycercidae)

Australian Journal of Zoology ◽

10.1071/zo9760541 ◽

1976 ◽

Vol 24 (4) ◽

pp. 541 ◽

Cited By ~ 5

Author(s):

MJ Smith ◽

JLG Brereton

Keyword(s):

Social Rank ◽

Gonadal Development ◽

Early Summer ◽

First Year ◽

Adult Males ◽

Cortical Cells ◽

Physiological Phenomenon ◽

One Year ◽

Adrenal Cortical Cells ◽

Gonadal Condition

Gonadal development in the eastern rosella was investigated in samples shot approximately monthly for one year near Armidale, N.S.W. In the testes of males of all ages and social rank, spermatogenesis begins in September, and by December the testis tubules of all males are filled with sperm. The histological stages of spermatogenesis are described. The Leydig cells of the testis are smaller in autumn, when the testes are regressing, than in early summer, when the testes are maximally developed. Between first-year and adult males, no differences could be discerned in the rate nor degree of development of testis tubules and intertubular tissue, but the weight of first-year birds' testes at full spermatogenesis was less than that of adults. In at least some first-year females the ovaries develop and eggs are released. Adrenal glands of adult males are smaller than those of females and first-year males. The adrenal cortical cells of all birds, male and female, are larger during the breeding season than during the subsequent moulting period. The similarity of gonadal condition between first-year birds and adults, together with the small differences in adrenals, leads to the conclusion that the failure of first-year birds to breed is a behavioural rather than physiological phenomenon.

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Growth of the Silverside Atherinella brasiliensis in Tramandaí Estuary, Southern Brazil (Actinopterygii: Atherinopsidae)

Neotropical Ichthyology ◽

10.1590/s1679-62252007000400008 ◽

2007 ◽

Vol 5 (4) ◽

pp. 485-490 ◽

Cited By ~ 5

Author(s):

Giovana Bervian ◽

Nelson F. Fontoura

Keyword(s):

Growth Parameters ◽

Growth Curves ◽

Von Bertalanffy ◽

Southern Brazil ◽

Rio Grande Do Sul ◽

Beach Seine ◽

Frequency Distributions ◽

First Reproduction ◽

Males And Females ◽

One Year

The growth of Atherinella brasiliensis (Quoy & Gaimard, 1824) was studied through monthly samples taken at Tramandaí Lagoon, Imbé County, Rio Grande do Sul, Brazil. Animals were captured using a beach seine net. Length-weight relationships and age- growth curves for males and females were adjusted. The growth parameters of the von Bertalanffy growth formulae are Linf=16.0 and k=0.883 for males and Linf=17.0 and k=0.825 for females. First reproduction occurred one year after recruitment. Once reaching maturity, adults of A. brasiliensis reproduced once more in the next spring with two-year-olds and disappeared soon after from size frequency distributions. A few captured animals showed a size compatible with an age of three years.

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Reproductive strategies of a population of a freshwater amphipod (Crustacea, Amhipoda, Hyalellidae) from southern Brazil

Biota Neotropica ◽

10.1590/1676-0611-bn-2017-0470 ◽

2018 ◽

Vol 18 (2) ◽

Cited By ~ 1

Author(s):

Daniela da Silva Castiglioni ◽

Morgana Taís Streck ◽

Stella Gomes Rodrigues ◽

Alessandra Angélica de Padua Bueno

Keyword(s):

Body Size ◽

Reproductive Success ◽

Reproductive Strategies ◽

Reproductive Period ◽

Lower Probability ◽

Southern Brazil ◽

Size Classes ◽

Cephalothorax Length ◽

Males And Females ◽

The Mean

Abstract: The aim of this study was to characterize the reproductive strategies of a population of Hyalella bonariensis from southern Brazil. Pairing success, reproductive period of males and females, fecundity, and body size at the onset of reproduction were evaluated. Animals were sampled four times (August 2012, October 2012, January 2013, and April 2013) with the 250 µm-mesh dip net during 20 minutes by only one person. In the field, precopulatory pairs and ovigerous females were individualized. In the laboratory, cephalothorax length (CL) were measured and eggs and juveniles were removed from the females' marsupium and counted. The mean CL of paired males and females was significantly higher than that of non-paired males and females. A sexual dimorphism in body size was observed in the population - both paired and non-paired males were larger than females. Probably larger males have a higher probability of losing females during precopulatory behavior. A significant correlation was observed between the size of paired males and females - larger males often paired with larger females and smaller males paired with smaller females (r = 0.81). The pairing success of males increased with body size and we can assume that males from all size classes are able to find mates. The pairing success of females was independent of body size - paired and non-paired females had similar mean CL. The reproductive success increased with body size in males and females, and was more evident in males. Females from the largest size classes had null reproductive success. The idea that larger females can produce more eggs but might have a lower probability of finding a mate than smaller females was corroborated by our results. Therefore, smaller females have higher pairing success because they are capable of mating with a higher percentage of males. The estimated mean fecundity of H. bonariensis was 17.4 (± 3.89) eggs/juveniles. Our results are similar to those of other species of Hyalella from Brazil.

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Relative Growth and Its Use to Determine the Morphological Sexual Maturity of Ucides Cordatus (Linnaeus, 1763) (Decapoda, Brachyura, Ucididae) from Two Mangrove Areas on the Northeastern Brazilian Coast

Crustaceana ◽

10.1163/001121611x590139 ◽

2011 ◽

Vol 84 (10) ◽

pp. 1221-1241 ◽

Cited By ~ 7

Keyword(s):

Sexual Maturity ◽

Carapace Width ◽

Reproductive Behaviour ◽

Brazilian Coast ◽

Positive Allometry ◽

Relative Growth ◽

Ucides Cordatus ◽

Males And Females ◽

One Year ◽

Major Cheliped

AbstractThe study of relative growth was used to determine the dimensions that best demonstrate the morphological sexual maturity of Ucides cordatus from two mangrove areas (Ariquindá and Mamucabas) of the southern coast of the state of Pernambuco, northeast Brazil. The crabs were collected manually, with a capture effort by one person, during low tide in three different areas (each 25 m2) during a period of one year from April 2008 to March 2009. Crabs of both sexes were measured for the following dimensions: carapace width (CW); carapace length (CL); major cheliped propodus length (CPL); major cheliped propodus height (CPH); abdomen width (AW) and gonopod length (GL). These variables were subjected to an analysis of K-means clustering followed by a bivariate discriminant analysis, which separated the data into two groups: juveniles and adults. After separation of the groups, each age category was grouped into sixteen size classes of CW and the proportion of adults in each size class was calculated, and fitted to a logistic equation. Subsequently, an interpolation was performed to determine the size at which 50% of the males and females were mature. The relationships that best demonstrated the size at maturity were CPL vs. CW for males (Positive allometry; Ariquindá — juveniles b = 1.27, adults b = 1.41; Mamucabas — juveniles b =1.27, adults b = 1.44) and AW vs. CW for females (Positive allometry; Ariquindá — juveniles b = 1.34, adults b = 1.28; Mamucabas — juveniles b = 1.32, adults b = 1.44). The present analysis indicates that, for these same relationships, 50% of males and females are morphologically mature, at, respectively, 38.0 and 35.4 mm CW in Ariquindá, and 37.3 and 32.9 mm CW in Mamucabas. Positive allometry shown in the female abdomen is related to egg incubation, and the excessive growth observed in the male cheliped must be related to reproductive behaviour, including courtship and intra- or inter-specific agonistic interactions with other males.

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Annual reproductive phenology of the coprophagous beetle Dichotomius satanas (Coleoptera: Scarabaeidae, Scarabaeinae) of the cloud forest in eastern Mexico

The Canadian Entomologist ◽

10.4039/tce.2020.75 ◽

2021 ◽

pp. 1-15

Author(s):

Julliana Barretto ◽

Magdalena Cruz ◽

Federico Escobar

Keyword(s):

Minimum Temperature ◽

Morphological Changes ◽

Cloud Forest ◽

Abiotic Factors ◽

Reproductive Period ◽

Climatic Conditions ◽

Reproductive Phenology ◽

Temperature And Precipitation ◽

Three Stages ◽

Males And Females

Abstract Reproductive phenology of organisms is modulated by biotic and abiotic factors, with direct effects on the demography. This study describes the annual reproductive phenology of Dichotomius satanas (Harold, 1867) (Coleoptera: Scarabaeidae, Scarabaeinae) of the cloud forest in eastern Mexico, through the morphological changes in the reproductive systems of individuals and their relationship with climatic conditions. Three stages of sexual maturity were recognised as occurring throughout the year: immature, maturing, and mature – with a higher occurrence of immature individuals. Abundance of immature and maturing females was explained by minimum temperature, but none of the environmental variables considered was related to mature females. Abundance of immature and maturing males was related to precipitation, while abundance of mature males was related to minimum temperature and precipitation. The phenology of D. satanas was markedly seasonal with a single peak of abundance corresponding to the reproductive period during the warm and rainy season, thus indicating a univoltine pattern of reproduction. Immature females were recorded before immature males, and no synchrony was observed between the maturing and mature males and females. We provide information pertaining to the reproductive biology of coprophagous beetles and highlight the importance of reproductive phenology as a tool with which to understand future environmental scenarios.

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Selenium Role in Reproduction, Pregnant/Postpartum Women and Neonates: A Current Study

Current Nutrition & Food Science ◽

10.2174/1573401316999200423121620 ◽

2020 ◽

Vol 17 (1) ◽

pp. 28-37

Author(s):

Tabinda Sattar

Keyword(s):

Infant Development ◽

Selenium Deficiency ◽

Human Reproduction ◽

Postpartum Women ◽

Female Reproduction ◽

Pregnancy And Lactation ◽

Males And Females ◽

One Year ◽

Selenium Supplements

Background: Selenium is a micronutrient, although required in low amounts, its importance in male and female reproduction is well known. Objectives: The core purpose of this study is to evaluate the role of selenium in human reproduction, during pregnancy/ lactation in women and newborns. The review explains side by side the sources of selenium, required amounts of selenium in humans and during pregnancy or lactation. Methods: Selenium deficiency is a major cause of male infertility. Similarly, selenium deficiency, both in pregnant and postpartum women, would greatly affect the health of the newborn baby in all respects. The effect of maternal selenium upon the fetus and the neonates even one year after birth has been explained with some recent examples. Results: The study elaborates the fact that the selenium deficiency in pregnancy and lactation is common due to fetal/infant development, so selenium supplements must be provided in order to overcome these deficiency symptoms. Conclusions: The better reproductive health in humans is possible due to the sufficient amounts of selenium present both in males and females as well.

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Cuttlebone morphometrics and sex identification of Sepia bertheloti (d’Orbigny, 1835) from the central-east Atlantic

Helgoland Marine Research ◽

10.1186/s10152-019-0531-0 ◽

2019 ◽

Vol 73 (1) ◽

Author(s):

Airam Guerra-Marrero ◽

David Jiménez-Alvarado ◽

Vicente Hernández-García ◽

Leticia Curbelo-Muñoz ◽

José Juan Castro-Hernández

Keyword(s):

Morphometric Analysis ◽

Growth Pattern ◽

Gonadal Development ◽

Sex Identification ◽

East Atlantic ◽

Subsequent Increase ◽

Northwest Africa ◽

Males And Females

Abstract Analysis of 322 cuttlebones of Sepia bertheloti caught in the waters of the Northwest Africa showed significant differences in growth between males and females. Morphometric analysis revealed a relatively different cuttlebone growth pattern between sexes, with males presenting faster growth in length to reach larger sizes and females displaying greater growth in width. This difference in cuttlebone growth is related to female gonadal development and the subsequent increase of the paleal cavity, providing more support and space to accommodate a higher number of oocytes.

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