Reproductive biology of Astyanax lacustris (Characiformes: Characidae) in the southern Pantanal floodplain, upper Paraguay River basin, Brazil

Súarez, Yzél Rondon; Silva, Edileia A.; Viana, Lucilene Finoto

doi:10.1007/s10641-017-0604-3

Cited by 16 publications

(20 citation statements)

References 36 publications

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“…The reproductive period was recorded throughout the year, as commonly reported for other Cheirodontinae (Azevedo et al 2010, Oliveira et al 2010, Tondato et al 2014. However, it was more pronounced in March and April, suggesting that greater reproductive activity is related to the end of the dry season (rainy), as observed by Súarez et al (2017) with the species Astyanax lacustris in the same region. This is according to the proposition by Humphries et al (1998) who suggested the idea of 'low flow recruitment' (LFR) owing to the concentration of food resources and the ability to reproduce without a high degree of competition with other migrating and rheophilic species which tend to increase the abundance during the flood season, when the environmental conditions for reproducing are more suitable for them.…”

Section: Discussionsupporting

confidence: 76%

“…Population studies showing variation and/ or plasticity of life history traits are found mostly between populations of the same species/genus or even between family/orders (Rochet 2000, Azevedo et al 2010. When it comes to variability between sexes, there are a lacking of studies presenting these information (Feitosa et al 2004, Gomiero et al 2007, Barzotto & Mateus 2017, mainly with small-sized species (Tondato et al 2012, Súarez et al 2017, due to its relatively unimportant status in the fishery. Nonetheless, small-sized species are essential to the base composition of the food chain for the midand large-sized fish, highlighting the importance of understanding their population aspects for the purposes of management and conservation of fish fauna.…”

Section: Introductionmentioning

confidence: 99%

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POPULATION ASPECTS AND RECRUITMENT OF Odontostilbe paraguayensis (CHARACIFORMES: CHARACIDAE) IN THE PARAGUAY RIVER, PANTANAL, BRAZIL

et al. 2019

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Population dynamics allows comprehension on how population assures its success on continuity of the species and the balance of its population density. Thus, in order to analyze reproductive parameters (i.e., gonadal maturation stages, fecundity, and recruitment) and population aspects (i.e., length-weight frequency, asymptotic length, growth and mortality rates, and sex ratio) of Odontostilbe paraguayensis Eigenmann & Kennedy (1903) (Characiformes: Characidae) in the southern Pantanal of Brazil, samples were carried out from February 2009 to January 2011 along the main channel of the Paraguay River and its tributary, the Amonguijá River, with seine net and a rectangular sieve (0.8 x 1.2 m). To estimate population parameters, the data of 604 individuals were recorded, and for reproductive aspects, the data of 394 individuals were recorded. The sex ratio was 3:1 (females:males). The estimated asymptotic length (L∞) was 36.67 mm. The population had high growth rate values (k = 1.3 year-1) and mortality (Z = 1.98). Longevity was estimated as 2.3 years. The mean absolute fecundity was 420.2 oocytes/female. Absolute fecundity was positively related to total weight (g) and gonad weight (mg). For females, the standard length at first maturity (L50) was 24.1 mm, and for males, it was 27.6 mm. Reproducing females were more frequent in March and April, although females with ripe gonads were recorded nearly all year long. The recruitment pattern was long with positive correlation with the average historic level of the Paraguay River, considering seasonal flooding. The lengthweight relationships were not different between the sexes, but they presented negative allometric growth. Thus, during ontogeny, the species presents more increment in length than in weight, and, consistent with the high growth rate, this may be understood as a way to reach longer lengths faster to avoid predation. The outcomes demonstrate that O. paraguayensis has a short life cycle with high growth and mortality rates. Together with the long recruitment pattern and high fecundity, the species may be considered an r-strategist.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

POPULATION ASPECTS AND RECRUITMENT OF Odontostilbe paraguayensis (CHARACIFORMES: CHARACIDAE) IN THE PARAGUAY RIVER, PANTANAL, BRAZIL

et al. 2019

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“…In this study despite sex ratio differ significantly; there was no variation in sex ratio throughout the years, indicating that females are proportionally more numerous than males. Súarez et al (2009Súarez et al ( , 2017 comment that larger proportion of females can be a strategy for rapid population growth, which would be important to H. eques which, due to its small size, never becomes large enough to no longer be prey, demanding a rapid population growth in order to minimize mortality and consequent probability of local extinction.…”

Section: Discussionmentioning

confidence: 99%

“…In Neotropical region, studies that quantify life history traits of fishes are concentrated mainly in the medium and large-sized species, which present commercial interest and are targets of fishing (Mateus and Penha, 2007;Arantes et al, 2011;Paschoalini et al, 2013). Recently, however, studies have analyzed population and reproductive traits of small species in different environments (Cunha et al, 2007;Tondato et al, 2014;Normando et al, 2014;Almeida-Silva and Mazzoni, 2014;Súarez et al, 2017), showing a high phenotypic plasticity in response to spatio-temporal variations (Mérona et al, 2009;Olden and Kennard, 2010).…”

Section: Introductionmentioning

confidence: 99%

Reproductive biology of Hyphessobrycon eques (Characiformes: Characidae) in Southern Pantanal, Brazil

2019

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Population and reproductive aspects allow the knowledge and understanding of population dynamics and the influence of environmental factors, in addition to ensure the success of a species continuity. Thus, the aim of this study was to analyze population and reproductive traits of the species Hyphessobrycon eques in southern Pantanal, Brazil. Monthly samplings were conducted from February/2009 to January/2011, with 617 individuals analyzed, being 365 females and 262 males. A similar form of distribution in length and weight between the sexes was observed. There was no significant variation in sex ratio over time, with higher proportion of females during the entire sampled period. Both sexes presented a angular coefficient of Weight/Length (b) relationship greater than 3, with speed of increase in weight greater than in length. For females, a long reproductive period was observed, with greater reproductive intensity from January through June. No significant correlation was observed between the Gonadosomatic Index (GSI) and the average temperature, rainfall and river level, despite the fact that reproductive activity occurs in autumn/winter, when there are favorable conditions due to flooding. The size at first maturation (L50) was 20.2 mm, with confidence interval varying from 19.7 through 20.7 mm. The average fecundity was 191.9 oocytes/females and was significantly related to the standard length and total weight (g), demonstrating a relation with energy accumulation to invest in reproduction. The long reproductive period, intensified by partial spawning, higher proportion of females and low L50, show that the species has strategies necessary for survival and rapid population growth, common in small species characterized as r-strategists.

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“…This species has characteristics that make it an important example for variations in life history studies, such as small size, opportunistic habits, fast life cycle, reduced locomotion potential and absence of spatial stratification, which makes it easy to obtain representative samples of the population. This species also has wide distribution (Súarez, Silva, & Viana, 2017) with high potential for differentiation among populations owing to its isolation, causing, in turn, differentiation of genetic and ecological characteristics.…”

mentioning

confidence: 99%

New approaches to basic population ecology studies: Revealing more complex patterns of a small Characidae that inhabit streams

Alves

Vasconcelos

Rossi

et al. 2020

Ecology of Freshwater Fish

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Bayesian inference was used to estimate the main population parameters (sex ratio, L50, LWR and somatic growth) and to evaluate sexual dimorphism and growth patterns (isometric/allometric and monophasic/biphasic growth) of Astyanax paranae of the Upper Paraná River. This study brings three statistical differentials: (a) the reparametrisation of the logistic model as a function of L50; (b) the reparameterisations of the LWR models based on the exponential of a piecewise linear regression to evaluate the hypotheses of polyphase growth; and (c) the first application of the recently proposed somatic growth models based only on length data to real data, as well as its expansion and generalisation. The models estimated L50 of females at 37.75 mm and sex ratio at 1.4 females per male. LWR models showed that both sexes presented biphasic growth with a lower increase in weight for males in first stanza. In second stanza, both sexes presented a greater increase in weight. Growth models showed that the growth rates were low, equal for both sexes in early life and slightly higher for females after the eighteenth months old. The studied population inhabits streams, therefore being exposed to constraining conditions that can limit the expression of their whole growth potential since they prioritise energy allocation for reproduction and survival, including reducing L50 in order to ensure the maintenance of the population. Finally, the complex biological patterns that arose from the proposed LWR and growth models demonstrated high potential and applicability for population studies.

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Reproductive biology of Astyanax lacustris (Characiformes: Characidae) in the southern Pantanal floodplain, upper Paraguay River basin, Brazil

Cited by 16 publications

References 36 publications

POPULATION ASPECTS AND RECRUITMENT OF Odontostilbe paraguayensis (CHARACIFORMES: CHARACIDAE) IN THE PARAGUAY RIVER, PANTANAL, BRAZIL

POPULATION ASPECTS AND RECRUITMENT OF Odontostilbe paraguayensis (CHARACIFORMES: CHARACIDAE) IN THE PARAGUAY RIVER, PANTANAL, BRAZIL

Reproductive biology of Hyphessobrycon eques (Characiformes: Characidae) in Southern Pantanal, Brazil

New approaches to basic population ecology studies: Revealing more complex patterns of a small Characidae that inhabit streams

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