Growth and reproductive biology of the amphidromous shrimp Palaemon pandaliformis (Decapoda: Caridea) in a Neotropical river from northeastern Brazil

Paschoal, Lucas Rezende Penido; Guimarães, Fernanda Jordão; Couto, Erminda da Conceição Guerreiro

doi:10.1590/s1984-4689zool-20160060

Cited by 14 publications

(12 citation statements)

References 30 publications

(50 reference statements)

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“…However, it is important to highlight the need for more studies comparing differences in the fecundity of P. northropi populations found at various latitudes. [47] In this study, we found that female P. northropi did not lose embryos during embryonic development, even while inhabiting estuarine environments with stressful conditions, like daily variations of salinity and temperature. Caridean shrimps and other decapods adopt a specific behavior during the incubation period, in which females spend some time brushing the embryo mass to remove parasites and to ensure good oxygen supply [56].…”

Section: Discussionmentioning

confidence: 56%

“…However, since fecundity varies with female body size, it is expected that larger species, such as those mentioned above, present a higher fecundity compared to P. northropi (Table 1). Therefore, it is of no surprise that the fecundity of P. northropi is equivalent to the similarly sized P. pandaliformis [45,46,47]. Compared to other populations of P. northropi, the fecundity recorded in this study was higher than for P. northropi from the region of Ubatuba, Brazil [11] (Table 1).…”

Section: Discussionmentioning

confidence: 62%

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Reproductive biology of the shrimp Palaemon northropi (Rankin, 1898) (Caridea: Palaemonidae) from an estuary in the Brazilian northeastern

et al. 2019

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The objective of this study was to evaluate aspects of the reproductive biology of Palaemon northropi, a shrimp of the northeastern Brazilian estuarine region. The specimens were sampled between July and November 2017, with a hand net, and were identified to species level and sexed. We measured the carapace length (CL) of males and females and the second pleura length (PL) of females. A total of 85 individuals were collected, including 36 males and 49 females (24 non-ovigerous and 25 ovigerous). The sex ratio was 0.42, with a non-significant departure from the 1:1 ratio. Mean sizes (±SD) of males and females were 3.41±0.54 and 4.98±1.33 mm CL, respectively. The mean size of the PL (±SD) of females was 2.67±1.03 mm CL. Mean fecundity was 255±57.84 embryos. The CL was positively associated with fecundity, but the fecundity did not vary between embryo developmental stages. Palaemon northropi shows sexual dimorphism, with females being larger than males. The results indicate that the embryonic development of P. northropi occurs normally, even in an estuarine region, such as that of present study, since there was no significant loss of embryos during development. This study contributes to knowledge of the reproductive biology of P. northropi and help in our understanding of the ecological relevance of these shrimps in estuarine environments.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 62%

Reproductive biology of the shrimp Palaemon northropi (Rankin, 1898) (Caridea: Palaemonidae) from an estuary in the Brazilian northeastern

et al. 2019

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“…Por otra parte, las relaciones entre el tamaño de las hembras y el número de huevos de M. reyesi contribuyen a la comprensión de la diversidad de estrategias reproductivas observadas en Palaemonidae (Nazari et al 2003), donde es claro que su fecundidad aumenta con el mayor tamaño corporal, como lo registrado en Palaemon pandaliformis Stimpson, 1871 (Paschoal et al 2016) y M. amazonicum (Aya-Baquero y Velasco-Santamaría 2013). En este caso se puede inferir que M. reyesi es una especie con desarrollo larval abreviado o directo (Pereira 1986) debido al bajo número (8-54) y gran tamaño (0,01-0,09 g) de los huevos, y también porque se observaron larvas dentro de los pleópodos en algunas hembras revisadas (obs.…”

Section: Discussionunclassified

Aspectos ecológicos de decápodos del río Guayuriba (Meta, Colombia)

Vasquez-R.

Bocanegra-M.

2019

Caldasia

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La biomasa y papel detritívoro-triturador de los decápodos contribuyen al procesamiento de materia orgánica y reciclaje de nutrientes en sistemas acuáticos. Sin embargo, poco se conoce de su biología y ecología. El objetivo de esta investigación fue determinar la riqueza y distribución de decápodos, y describir algunos de sus aspectos biológicos en el río Guayuriba. Los organismos se capturaron con pesca eléctrica en once estaciones. Se determinó la riqueza y distribución espacial. A partir de diagramas de densidad y la prueba Kruskal-Wallis se compararon longitud total, del cefalotórax y peso, entre machos, hembras y estaciones. Se realizaron correlaciones entre el número y peso de huevos contra peso y longitud del cefalotórax de hembras de Macrobrachium reyesi. Se registraron tres especies, la más frecuente fue M. reyesi, seguida de Forsteria venezuelensis y Macrobrachium amazonicum. Las hembras de M. reyesi fueron más grandes que los machos, contrario a M. amazonicum. A nivel espacial machos y hembras de M. reyesi registraron diferencias significativas en longitud total, cefalotórax y peso; éstas fueron mayores en hembras ovadas respecto a no ovadas. El tamaño de las hembras mostró una correlación positiva con el número y peso de los huevos. M. reyesi presenta estrategias reproductivas similares a especies adaptadas completamente al agua dulce. Su tamaño para alcanzar la madurez sexual es relativamente pequeño en relación con otras especies. Investigaciones básicas como esta son necesarias para el manejo adecuado de recursos con potencial pesquero en la Orinoquia, caracterizada por su gran riqueza hídrica.

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“…Thus, a smaller portion of energy seems to be destined to the production of gametes and seminal fluid, while a greater portion may be directed to body size increase and production and maintenance of robust chelipeds (i.e. sexual weapons), increasing the fitness of males in intraspecific competitions (Correa and Thiel, 2003;Paschoal et al, 2016). Macrobrachium amazonicum has great adaptive and morphological plasticity that can be explained by the synergy of reproductive variability and physiological responses to the environments in which it occurs (Maciel and Valenti, 2009;Vergamini et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Sperm count of Macrobrachium amazonicum (Heller, 1862) populations with distinct life histories, with introduction of a simple counting method

Paschoal

Zara

2018

Aquaculture

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Sperm count is an important quality assessment tool in farming programs and stock improvement in crustaceans. However, this procedure is still little used in caridean shrimps and standardization of appropriate techniques for the group is lacking. In this study, we propose a simple protocol adapted to determine sperm count in carideans using as model the Amazon River prawn Macrobrachium amazonicum. Males of dominant morphotypes (GC1 and GC2) of this species with amphidromous and hololimnetic life cycles were collected and carefully dissected. The ejaculatory duct was removed from the vas deferens and dissociated in a solution of distilled water (9 μl) and methylene blue (1 μl). Subsequently, 1 μl of this new solution was added to distilled water (9 μl), and then 1 μl was pipetted and quantified in a Neubauer chamber. The feasibility of this technique was also evaluated in animals preserved (5-480 days) in 70% ethanol from collections and the structural morphology of spermatozoa (spz) was examined. Despite morphometric differences observed between different types of males, the mean sperm count was similar for the species. In amphidromous animals, 60,258 spz/μl were registered for GC1 and 65,308 spz/μl for GC2, while in hololimnetic prawns, 48,950 spz/μl were registered in GC1 and 53,850 spz/μl in GC2. The variation in sperm count among animals preserved for different periods of time was small and very similar to those of fresh animals. Also, no microscopic changes in the structures of spz were observed. This technique can be applied to obtain a spermiogram in fresh as well as preserved animals, being especially important in studies with animals examined in population studies and deposited in collections or laboratories. This protocol can be used as a general model for spermiogram in caridean shrimps due to the great similarity of male reproductive systems within the group.

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Growth and reproductive biology of the amphidromous shrimp Palaemon pandaliformis (Decapoda: Caridea) in a Neotropical river from northeastern Brazil

Cited by 14 publications

References 30 publications

Reproductive biology of the shrimp Palaemon northropi (Rankin, 1898) (Caridea: Palaemonidae) from an estuary in the Brazilian northeastern

Reproductive biology of the shrimp Palaemon northropi (Rankin, 1898) (Caridea: Palaemonidae) from an estuary in the Brazilian northeastern

Aspectos ecológicos de decápodos del río Guayuriba (Meta, Colombia)

Sperm count of Macrobrachium amazonicum (Heller, 1862) populations with distinct life histories, with introduction of a simple counting method

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