Reproductive strategies of two sympatric species of <i>Hyalella</i> Smith, 1874 (Amphipoda, Dogielinotidae) in laboratory conditions

Castiglioni, Daniela da Silva; Bond‐Buckup, Georgina

doi:10.1080/00222930701464604

Cited by 21 publications

(26 citation statements)

References 75 publications

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“…This result may be related to the greater investment in reproduction by females (Cardoso and Veloso, 1996), as also observed in other species of Hyalella from Brazil (Castiglioni and Bond-Buckup, 2007). Other reason could be the fact that female amphipods incubate the eggs in the marsupium (Borowsky, 1991), and often even juveniles, developing a parental care behavior, which results in a molt prolongation, limiting their growth (Thiel, 2003).…”

Section: Population Dynamics Of a Freshwater Amphipodmentioning

confidence: 92%

“…However, its biology and ecology are still unknown. Regarding the biology of native species of Hyalella from Brazil, studies have been conducted about ecology and reproduction of two sympatric species, Hyalella pleoacuta González, Bond-Buckup and Araujo, 2006 and Hyalella castroi González, Bond-Buckup and Araujo, 2006 (Castiglioni and Bond-Buckup, 2007;2008a;2008b;2009;.…”

Section: Introductionmentioning

confidence: 99%

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Population dynamics of a freshwater amphipod from South America (Crustacea, Amphipoda, Hyalellidae)

et al. 2016

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Th is study aimed to characterize the population dynamics of Hyalella bonariensis Bond-Buckup, Araujo & Santos, 2008 from headwater spring in a rural area of state of Rio Grande do Sul, Brazil. Four samples were collected in August (winter) and October (spring) of 2012 and January (summer) and April (autumn) of 2013. Ovigerous females and precopula pairs were separated from other individual in the fi eld. A total of 5,266 specimens were sampled, being 1,878 males, 2,073 females (including 240 ovigerous females) and 1,315 juveniles. Th e frequency distribution of size classes (measured as cephalothorax length, CL) was polymodal and bimodal in males and females, respectively. Males reach larger size than females. Sexual maturity of males and females was estimated at 0.40 and 0.38 mm for CL, respectively. Total sex ratio favored females, and these were more frequent in intermediate size classes, while males were more frequent in larger size classes. Ovigerous females and couples were found in four seasons, but both were more abundant in winter. Juveniles were also found in all seasons, being more frequent in winter and spring. Th ese results showed that this H. bonariensis population has similar dynamics to other species of Hyalella Smith, 1874 from Brazil, but present variations when compared to other freshwater amphipods. keY wordsBody size, Hyalella, reproductive period, sex ratio, sexual maturity. Castiglioni et al.2

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Section: Population Dynamics Of a Freshwater Amphipodmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Population dynamics of a freshwater amphipod from South America (Crustacea, Amphipoda, Hyalellidae)

et al. 2016

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“…The propodus of gnathopod 2 increased in size until stage 4, showing that there was no sexual differentiation until this stage, as also observed by CASTIGLIONI et al (2007).…”

Section: Morphology Of the Appendages Of S-1 To S-4mentioning

confidence: 56%

“…After they left the marsupium, the juveniles were separated and maintained under the same conditions. These procedures were used by CASTIGLIONI et al (2007) to culture the same species. The containers were checked daily for the presence of exuviae.…”

Section: Methodsmentioning

confidence: 99%

“…The stages were determined from the molts: stage 1 (S-1), juveniles released from the marsupium, until the first molt; stage 2 (S-2), juveniles between the first and second molts; stage 3 (S-3), juveniles between the second and third molts; and stage 4 (S-4), juveniles between the third and fourth molts (see CASTIGLIONI et al 2007). Juveniles of all four stages were dissected under a stereoscopic microscope, and the appendages were mounted on slides in glycerin.…”

Section: Methodsmentioning

confidence: 99%

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Post-marsupial development of Hyalella pleoacuta (Crustacea: Amphipoda): stages 1-4

Garcia-Schroeder¹,

Araujo²

2009

Zoologia (Curitiba, Impr.)

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ABSTRACT. The goal of this study is to describe and compare the initial stages of the post-marsupial development of Hyalella pleoacuta González, Bond-Buckup & Araujo, 2006, prior to the development of sexual dimorphism. Ovigerous females were collected in São José dos Ausentes, RS, Brazil and kept in laboratory. Juveniles were kept separately after emerging from the marsupium and were monitored daily for the presence of exuvia. Individuals from post-marsupial stages (S) 1 to 4 were dissected and illustrated. Cuticular structures were observed through SEM. Twenty three types of setae, one type of setule, two types of pores, two types of denticles and one type of penicilium were found. Cuticular structures undergo modification through development in the matters of haste size, number and size of setules, and formation of the polygonal pattern, although there is no change from one type to another. Gnathopods and antennae are the appendages that go through more modifications. The articles number of the flagellum is constant until S2. The size of the coxal plate of gnathopods in relation to the propodus has a tendency to increase throughout the stages. The uropod proportion becomes smaller in S3 when compared to S1. The number of serrate setae in the external plate of maxilla 1 varies up to S4, being different from the adult whose number is 9. The telson modifies its shape but its setae number is constant.

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Optimizing Sex Ratios of Hyalella azteca to Reduce Variability in Reproduction and Improve Reproductive Toxicity Test Methods

Khan,

Bartlett,

Kudla

et al. 2023

Enviro Toxic and Chemistry

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Standard toxicological test methods with Hyalella azteca incorporate both lethal and sublethal (growth, reproduction) endpoints, though lethal endpoints are often favoured in routine testing. However, sublethal endpoints are important to consider as they are ecologically relevant and are often more sensitive than lethality. It is difficult to achieve robust data for reproduction in H. azteca because a high biological variability associated with reproductive yield, likely due to complex interactions in mate selection which can add to the variability in brood sizes that female produce. In addition, effects on reproduction often co‐occur with effects on growth, making it difficult to differentiate effects of growth from those on reproduction in standard tests initiated with juveniles. This study characterized the reproductive capacity of H. azteca by investigating the role of sex ratios in reproductive yield. Experiments were initiated in the absence of toxicants with sexually mature (6‐8‐week‐old) individuals that were placed in different female to male ratios (1:1, 2:3, 3:2 and 7:3). Reproduction was monitored during weekly static renewals for seven weeks. Results indicated that a higher female:male ratio (7 females to 3 males) improved reproductive success and lowered biological variability in reproduction. In addition, the body lengths and weights of newly mature amphipods were used to create a size distribution to aid in the identification of small female amphipods. Based on the results of this study, a novel reproductive toxicity test method is proposed that begins with sexually mature amphipods in a ratio of seven females to three males to minimize reproductive variability in amphipods and to enable a more effective assessment of contaminants using reproduction as a highly sensitive endpoint.

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Reproductive strategies of two sympatric species of Hyalella Smith, 1874 (Amphipoda, Dogielinotidae) in laboratory conditions

Cited by 21 publications

References 75 publications

Population dynamics of a freshwater amphipod from South America (Crustacea, Amphipoda, Hyalellidae)

Population dynamics of a freshwater amphipod from South America (Crustacea, Amphipoda, Hyalellidae)

Post-marsupial development of Hyalella pleoacuta (Crustacea: Amphipoda): stages 1-4

Optimizing Sex Ratios of Hyalella azteca to Reduce Variability in Reproduction and Improve Reproductive Toxicity Test Methods

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