Growth of<i>Ligia exotica</i>(Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil

Lopes-Leitzke, Elis Regina; Dumont, Luiz Felipe Cestari; D’Incao, Fernando

doi:10.1017/s0025315409000460

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Previous studies have shown that an understanding of the parameters of growth and of the population structure of decapod crustaceans is fundamental for a better understanding of the biology and life cycle of these species (FONSECA; D' INCAO, 2003;KEUNECKE et al, 2007;LOPES-LEITZKE et al, 2009;ARCULEO et al, 2011). Thus, the goal of this study is to discern the patterns of the population dynamics of Acetes americanus -particularly the sex ratio, growth of individual specimens, longevity, and recruitment -in terms of the abundance of species and the influence of environmental factors in the region of Macaé, RJ.…”

Section: Introductionmentioning

confidence: 99%

Population parameters and the relationships between environmental factors and abundance of the Acetes americanus shrimp (Dendrobranchiata: Sergestidae) near a coastal upwelling region of Brazil

et al. 2015

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The population dynamics of Acetes americanus was investigated, focusing on the sex ratio, individual growth, longevity, recruitment and relationship between abundance and environmental factors in the region of Macaé, strongly influenced by coastal upwelling. Otter trawl net samplings were performed from July 2010 to June 2011 at two points (5 m and 15 m). Nearly 19,500 specimens, predominantly females (77.15%), were captured. Their sizes, larger than that of males, indicated sexual dimorphism. Shrimps at lower latitudes present larger sizes and longer longevity than those from higher latitudes. This difference is probably due to low temperatures and high primary productivity. Though no statistical correlation was found between abundance and environmental factors, the species was more abundant in temperatures closer to 20.0º C and in months with high chlorophyll-a levels. Due to the peculiar characteristics of this region, A. americanusshowed greater differences in size and longevity than individuals sampled in other studies undertaken in the continental shelf of Southeast Brazil.

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Section: Introductionmentioning

confidence: 99%

Population parameters and the relationships between environmental factors and abundance of the Acetes americanus shrimp (Dendrobranchiata: Sergestidae) near a coastal upwelling region of Brazil

et al. 2015

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“…Studies of the individual growth of crustaceans have been reported in the literature estimating age in relation to the size (Kirkwood and Sommers, 1984;Die, 1992;D'Incao and Fonseca, 1999;Pérez-Castañeda and Defeo, 2005). Previous studies (Fonseca and D'Incao, 2003;Dumont and D'Incao, 2004;Keunecke et al, 2007;Lopes-Leitzke et al, 2009;Arculeo et al, 2011) have demonstrated that understanding patterns in the growth and structure of crustacean populations is fundamental for deriving the life history necessary for the effective and sustainable management of these species. However, little information is available regarding the population parameters of Acetes, with the exception of studies by Zafar and Amin (2002), Oh and Jeong (2003) and Amin et al (2008Amin et al ( , 2009aAmin et al ( , 2009b.…”

Section: Introductionmentioning

confidence: 99%

Sex ratio, growth and recruitment of the pelagic shrimp Acetes americanus on the southeastern coast of Brazil

Simões

D’Incao

Fransozo

et al. 2013

Journal of Crustacean Biology

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We evaluated the population dynamics of Acetes americanus Ortmann, 1893 focusing on sex ratio, individual growth, longevity, and the juvenile recruitment period. Samples were collected monthly from January 2006 to June 2007 in the bay of Ubatuba, Brazil. Specimen growth was identified for each gender, and the chosen cohorts were fitted in a von Bertalanffy Growth Model (VBGM); longevity was estimated by the von Bertalanffy inverse equation, considering 99% of the asymptotic length. A total of 6881 individuals (2343 males and 4538 females) were captured. On average the body size (total length) was greater in females (14.64 ± 3.34 mm) than in males (12.27 ± 1.86 mm). The mean growth curves (obtained by grouping the cohorts for each sex), provided estimates of TL ∞ = 19.33 mm, k = 0.02 and t 0 = −0.12 days for females and TL ∞ = 15.13 mm, k = 0.03 and t 0 = −0.07 days for males, where TL ∞ is the asymptotic length, k is coefficient of growth and t 0 is the theorical age when the size is equal to 0. Longevity was estimated at 0.61 years for females and 0.50 years for males. The sex ratio tended to favor females, which corroborates with others studies of sergestids. Our finding that males of A. americanus have higher values of k and therefore achieve a smaller size relative to females has been observed in other penaeids. We concluded that this differential growth pattern between the sexes is found across Dendrobranchiata. The life cycles of penaeids have an average duration of approximately 1-2 years, but our results corroborate other studies that estimate a shorter longevity for Acetes, as species of this genus are typically smaller in size. We found continuous recruitment with two main peaks observed during the study period, corroborating previous studies of Acetes.

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“…These preys can be considered large, when compared to the mean size of the predator isopod that consumed them. Only males (TL= 34.57mm) are capable of this predation (LOPES-LEITZKE et al 2009). Another fact to consider is the reproductive season of the species.…”

Section: Discussionmentioning

confidence: 99%

Natural Diet of Ligia Exotica (Crustacea, Isopoda, Ligiidae) in Two Estuarine Regions of Patos Lagoon, Rio Grande Do Sul, Brazil

Lopes-Leitzke¹,

Macedo²,

Longaray³

et al. 2011

Atlântica

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RESUMODieta natural de Ligia exotica (Crustacea, Isopoda, Ligiidae) em duas regiões do estuário da Lagoa dos Patos, Rio Grande do Sul, Brasil Isópodos são exemplos da transição evolutiva dos crustáceos do mar para terra, existindo formas tipicamente aquáticas e formas tipicamente terrestres. Ligia exotica é dominante na região intertidal do Estuário da Lagoa dos Patos, tendo um importante papel na reciclagem de nutrientes e na cadeia trófica. A área de estudo compreendeu o Molhe Oeste de Rio Grande e a Ilha do Leonídeo. O conteúdo alimentar foi estudado sazonalmente, através da captura manual de indivíduos em Outubro/2003, Janeiro, Abril e Julho/2004. Após capturados, os indivíduos foram fixados imediatamente em formol 4% durante 24 horas e conservados em álcool 70%. Os tubos digestivos foram pesados e o grau de repleção foi estimado. O conteúdo de cada tubo digestivo foi diluído em 1 ml de água destilada. Para quantificação dos itens, o conteúdo foi colocado em uma lâmina de contagem graduada. Cada item identificado foi quantificado pela contagem do número de ocorrência nos quadrados da lâmina. Para testar a possível diferença entre a frequência dos itens consumidos por machos e fêmeas, foi utilizado o quiquadrado. Análises qualiquantitativas foram realizadas segundo os métodos de freqüência relativa de ocorrência, freqüência relativa dos pontos. Um total de 912 tubos digestivos foi analisado: 426 indivíduos no Molhe Oeste e 485 indivíduos na Ilha do Leonídeo. Seis itens alimentares foram identificados e diferenças significativas foram observadas nos itens consumidos por machos e fêmeas de ambas as populações. Os itens alimentares mais importantes para a dieta natural de Ligia exotica foram: detrito vegetal, areia e a alga Polysiphonia sp. Desta forma, em ambas as regiões do estuário, a espécie pode ser considerada generalista. PALAVRAS CHAVE: Oniscidea, Ligia exotica, alimentação, dinâmica populacional, Estuário da Lagoa dos Patos ABSTRACTIsopods are examples of the evolutive transition of the crustaceans from sea to land, inhabiting aquatic and terrestrial environments. Ligia exotica is dominant in the intertidal region of the of Patos Lagoon estuary, playing an important role in recycling nutrients and in the trophic web as a whole. The study area was the West Breakwater of Rio Grande Channel and Leonideo Island. The natural diet was analyzed through standardized one hour manual sampling performed in October/2003, January, April and July/2004. After collected, individuals were immediately fixed in 4% formalin during 24 hours and conserved in 70% ethanol. The guts were weighted and repletion degree was estimated. Each gut content was diluted in 1 ml of distilled water. To quantify the items, content was placed in a graduated slide for counting. Each identified item was quantified by the number of occurrences in the slide squares. To test significant differences between the frequencies of items consumed by males and females, a chi-square test was used. Qualiquantitative analysis was performed following the met...

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Growth ofLigia exotica(Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil

Cited by 6 publications

References 16 publications

Population parameters and the relationships between environmental factors and abundance of the Acetes americanus shrimp (Dendrobranchiata: Sergestidae) near a coastal upwelling region of Brazil

Population parameters and the relationships between environmental factors and abundance of the Acetes americanus shrimp (Dendrobranchiata: Sergestidae) near a coastal upwelling region of Brazil

Sex ratio, growth and recruitment of the pelagic shrimp Acetes americanus on the southeastern coast of Brazil

Natural Diet of Ligia Exotica (Crustacea, Isopoda, Ligiidae) in Two Estuarine Regions of Patos Lagoon, Rio Grande Do Sul, Brazil

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