Pairing and reproductive success in two sympatric species of Hyalella (Crustacea, Amphipoda, Dogielinotidae) from southern Brazil

Castiglioni, Daniela da Silva; Bond‐Buckup, Georgina

doi:10.1016/j.actao.2007.09.008

Cited by 15 publications

(15 citation statements)

References 49 publications

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“…The proportion of couples in the population of Hyalella carstica was slightly low, when compared to unpaired adults, even though couples were observed in all months. The same was observed for other species of Hyalella: Hyalella castroi Gonzalez, Bond-Buckup and Araujo, 2006 had 12.8% of males and 10.7% of females in pre-copula, and Hyalella pleoacuta Gonzalez, Bond-Buckup and Araujo, 2006 had 16.5% of males and 14.4% of females (Castiglioni and Bond-Buckup, 2008b). The low occurrence of couples in this H. carstica population can be related to the fact that the individuals stay in pre-copula for a short time, approximately 3 days (personal observation), since this behavior can make individuals more vulnerable to predation (Strong, 1973;Wellborn, 1995).…”

Section: Discussionsupporting

confidence: 76%

“…Another factor that must be taken into consideration is the relative body size difference between genders. Some studies with different species of amphipods showed that larger males prefer to mate with larger females (Dick and Elwood, 1993;Wellborn, 1995, Castiglioni andBond-Buckup, 2008b;Franceschi et al, 2010;Hume et al, 2005), but in other cases this did not occur (Wellborn, 1995;. The lack of relationship can be due to the fact that there was no significant variation between the size of paired males, or to the fact that females of all sizes were found in pairs (Wellborn, 1995).…”

Section: Discussionmentioning

confidence: 99%

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Reproductive aspects of Hyalella carstica (Amphipoda: Hyalellidae) in a natural environment in southeastern Brazil

2015

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Th e reproductive aspects of populations are important determinants of their ability to maintain themselves throughout time. In the case of amphipods from the genus Hyalella Smith, 1874, the reproductive period is easily determined by the presence of ovigerous females and pre-copula pairs in the population. Th is study evaluated the fecundity, pairing patterns and reproduction period of Hyalella carstica Bastos-Pereira and Bueno, 2012 in a karst environment in the West of Minas Gerais, Brazil. Monthly, from April, 2010 to April, 2011, amphipods were sampled using a hand net with 15 cm diameter and 250 µm mesh size. In the laboratory, animals were sexed and measured, and the ovigerous state of females was evaluated. Couples in pre-copula and ovigerous females were found throughout the year, with the exception of the dry months (September−November). During drought, the stream's superfi cial water dried out, and only a few refuges for the population remained. Although couples were found in all months with a water fl ow, a higher number of unpaired males and females was found after the dry season. In all months, ovigerous females were more abundant than non-ovigerous, and the relationship between head length and the number of eggs in the marsupium was positive. Most eggs were in the fi rst developmental stage, although all other stages were found before the dry season. Considering the frequency of pre-copula pairs, as well as ovigerous females, the reproduction in this H. carstica population seems to be continuous throughout the year, without a distinct peak.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Reproductive aspects of Hyalella carstica (Amphipoda: Hyalellidae) in a natural environment in southeastern Brazil

2015

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“…Besides, during the precopulatory period, males carry the females in their thorax until ovulation and fertilization (Borowsky, 1991). Smaller females are easily carried by males (Adams and Greenwood, 1983;Adams et al, 1985;Castiglioni and Bond-Buckup, 2008b), and larger males outcompete smaller ones during the mating process (Ward, 1983).…”

Section: Discussionmentioning

confidence: 99%

Population structure of two freshwater amphipods (Crustacea: Peracarida: Hyalellidae) from southern Brazil

2018

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“…The Pairing Success Index (PSI) was used to evaluate the relationship between pairing success and male and female size. The PSI was adapted by Wellborn (1995) from the relative feeding index (Manly 1974) and have already been used in other studies about Hyalella reproduction (Castiglioni & Bond-Buckup 2008b), and it is given by where, i is the relative pairing success in size class i; ri and ni are the proportion of paired and non-paired individuals, respectively. The denominator is the sum of the proportion of paired individuals from all size classes.…”

Section: Methodsmentioning

confidence: 99%

“…The precopulatory behavior is a common feature in some amphipod species. Males carry females on their ventral surface during several days prior female's molting, which signals mating availability (Hynes 1955;Wellborn 1995;Castiglioni & Bond-Buckup 2007;Castiglioni & Bond-Buckup 2008b). The precopulatory behavior probably ensures that the male is near when female reaches its short sexual period (Strong 1973;Borowsky 1984).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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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Pairing and reproductive success in two sympatric species of Hyalella (Crustacea, Amphipoda, Dogielinotidae) from southern Brazil

Cited by 15 publications

References 49 publications

Reproductive aspects of Hyalella carstica (Amphipoda: Hyalellidae) in a natural environment in southeastern Brazil

Reproductive aspects of Hyalella carstica (Amphipoda: Hyalellidae) in a natural environment in southeastern Brazil

Population structure of two freshwater amphipods (Crustacea: Peracarida: Hyalellidae) from southern Brazil

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

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