Seasonal Changes in Reproductive Traits of the Crab Sesarma Rectum (Grapsoidea: Sesarmidae) on the Northern Coast of São Paulo State, Brazil

Leme, Maria Helena de Arruda

doi:10.1651/c-2621.1

Cited by 16 publications

(7 citation statements)

References 31 publications

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“…The male crabs tend to be larger than female at mature, and this is observed in several species (Leme 2006;Benetti and Negreiros-Fransozo 2003;Litulo 2005;Hartnoll 1982;Hirose and Negreiros-Fransozo 2008;Mokhtari et al 2008). This sexual dimorphism in size can be explained from the more resource expending by females for reproduction, whereas males have a faster growth rate (da Silva Castiglioni et al 2011;Hartnoll 2006;Hartnoll et al 2009).…”

Section: Discussionmentioning

confidence: 95%

Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Ryu

Kim

2020

j ecology environ

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Adult land crabs generally live on land while their larvae live in the sea. In the case of Sesarma haematoche, female crabs migrate from land to sea to release the larvae at the high tide of syzygy night. Artificial structures along coastal areas are being obstacles for the migration of land crabs and causing synchronized roadkills on coastal roads during breeding migration. In this research, we compared the sex ratios of crab populations in coastal areas with coastal roads and uninhabited island areas with no road. The proportion of females in inland habitats with coastal roads was significantly smaller than island habitats. In particular, females are exposed to the risk of annually repeated roadkills, and the proportion of females decreases rapidly with their growth. If this tendency is general for land crab populations in the coastal areas with roads, significant road mortality of female land crabs during breeding migration can lead to severe population decline in coastal areas. Therefore, it is necessary to take an action to save land crabs crossing coastal roads.

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Section: Discussionmentioning

confidence: 95%

Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Ryu

Kim

2020

j ecology environ

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“…However, the relatively high fatty-acid content of pre-hatching eggs indicates larvae might display a certain degree of independence from external food sources (planktontrophy) (Staton & Sulkin, 1991; Leme, 2006; Rosa et al , 2007); this is in agreement with the results obtained by Urcera et al (1993) who studied the effect of starvation during early larval development of M. brachydactyla : if not fed, newly hatched larvae survived for a maximum of 6 days but only 10% of the larvae metamorphosed to zoea II. The fatty-acid composition of M. brachydactyla eggs was similar to that of other decapod species (Wehrtmann & Kattner, 1998; Narciso & Morais, 2001; Rosa et al , 2007); with some variation expected, as fatty-acid content varies between and within species according to the adults' diet and habitat (Cahu et al , 1986; Wehrtmann & Kattner, 1998; Rosa et al , 2007).…”

Section: Resultsmentioning

confidence: 99%

Egg volume, energy content and fatty acid profile ofMaja brachydactyla(Crustacea: Brachyura: Majidae) during embryogenesis

Figueiredo

Narciso

2008

J. Mar. Biol. Ass.

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Fatty-acid and energy content of Maja brachydactyla eggs at different developmental stages (recently spawned, half-developed and ready to hatch) were analysed in order to understand what is being consumed and produced during the embryonic development. Egg volume increased during development (34%, 0.187 to 0.285 mm 3 , N ¼ 270) and was negatively correlated with egg energy and fatty-acid content (r ¼ 20.80 and r ¼ 20.46, respectively), which decreased through embryogenesis. The most consumed fatty acids were the PUFA (21.2 mg . mg dw 21 ), followed by the SFA (18.8 mg . mg dw 21 ) and MUFA (14.9 mg . mg dw 21 ). Palmitic (16:0), oleic (18:1n-9) and eicosapentaenoic (EPA, 20:5n-3) acids were preferentially consumed (13.14, 9.21 and 8.67 mg . mg dw 21 , respectively). The fatty acid composition found in M. brachydactyla eggs reflected the habitat and omnivorous and detritivorous scanvenger diet of the adults, although the consumption of algae was more important than previously thought, at least in the area where these adults were captured. Pre-hatching eggs have a high PUFA content (64.5 mg . mg dw 21 or 46.3% of the egg fatty-acid content). We conclude that larvae of this species might need a diet rich in PUFA, particularly EPA and DHA, for successful development. From the culture perspective, live preys commonly used in aquaculture will likely require to be enriched with DHA.

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“…The reason for the differences could be related to food composition and availability in different seasons. For example, Belgrad and Griffen [41] reported that the food quantity consumed had a significant influence on the reproductive effort and long-term storage of energy in C. sapidus. The seasonal changes in energy allocation for reproduction were also reported in the semi-terrestrial crab Sesarma rectum [42].…”

Section: Morphometric Characteristicsmentioning

confidence: 99%

Morphometric, Histochemical, and Ultrastructural Analysis of the Reproductive System and Spermatogenic Stages of Male Blue Crab (Callinectessapidus Rathbun, 1896)

Ali

Sherif

Alla

et al. 2021

JMSE

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The blue crab, Callinectes sapidus Rathbun, 1896, is considered to be a luxury meal, especially in touristic cities. It contains more than 20 types of amino acids and provides all the needed amounts for human growth. This study describes the morphology and complex differentiation in the gonadosomatic index, morphological and ultrastructure features of the reproductive system, spermatogenesis, and spermatophores structure; this is due to the need to maintain natural and fishing stocks. Mature adult male crabs (carapace length 59 ± 7.12; width 126 ± 18.8 mm) were obtained from Abu-Qir Bay from November 2018 to October 2019 and transported alive in seawater to the laboratory. The reproductive system was dissected and weighed to the nearest 0.001g using the electronic balance, and the gonadosomatic index was subsequently calculated. The morphological analysis showed the developing testes with highly compacted seminiferous tubules. Using Periodic acid–Schiff stain, the spermatophore appeared with a zigzag-shaped wall that indicates its carbohydrate constituents. Each Spermatophore consisted of an inner spermatozoal mass embedded in a matrix, whose main components were secretions 1 and 2, and an outer thin acellular layer composed of secretions 3 and 4 from the anterior vas deferens (AVD). Secretions 5 and 6 (S5 and S6) also appeared with carbohydrate constituents using Mallory triple stain. The transverse section of the middle vas deferens (MVD) showed spermatophores with rod-shaped secretion S6 and granular secretions 7 (S7), forming a complex matrix between spermatophores. The secretion found in the MVD was granular, strongly acidophilic, and secreted by its highly columnar epithelium (S7). The ultrastructure showed that the testes were surrounded by a monolayer of myoid cells with an elongated nucleus, which also contained the following stages: spermatogonia, primary spermatocyte, secondary spermatocytes, and spermatids as well as spermatozoa. On the other hand, scanning electron microscope studies for fully formed spermatophore taken from the middle part of the vas deferens indicated that it is ellipsoidal in its outline with terminal stalk. Furthermore, the spermatophore was surrounded by a thick capsule of non-cellular substances and contained mature spermatozoa.

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Seasonal Changes in Reproductive Traits of the Crab Sesarma Rectum (Grapsoidea: Sesarmidae) on the Northern Coast of São Paulo State, Brazil

Cited by 16 publications

References 31 publications

Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Egg volume, energy content and fatty acid profile ofMaja brachydactyla(Crustacea: Brachyura: Majidae) during embryogenesis

Morphometric, Histochemical, and Ultrastructural Analysis of the Reproductive System and Spermatogenic Stages of Male Blue Crab (Callinectessapidus Rathbun, 1896)

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