Population Biology and Reproduction of Kalliapseudes Schubartii Mañé-Garzón, 1949 (Peracarida, Tanaidacea) in a Tropical Coastal Lagoon, Itaipu, Southeastern Brazil

Abstract

A population of the tanaidacean, Kalliapseudes schubartii Mañé-Garzón, 1949 was sampled monthly in order to study its life cycle in a southeastern Brazilian tropical lagoon. The species' density changed seasonally, increasing in the beginning of the wet season and presenting peaks following precipitation peaks in other periods. Density changed due to oscillations in numbers of larval stages and juveniles. Females were larger than males, and the size at onset of sexual maturity of females was 5.9 mm. The sex-ratio was female-skewed during all months, in accordance with studies of the same species at other sites along the Brazilian coast and on other species of tanaids. Ovigerous females and other developmental stages were observed in all samples. Peaks in the frequencies of larval stages and juveniles were followed by peaks in ovigerous female frequency. Comparisons of populations of K. schubartii at different sites along the Brazilian coast showed an intraspecific difference in their life cycles according to a latitudinal gradient, with longer reproductive activity occurring in the tropics. RÉSUMÉ[Les études de biologie des populations des espèces-proies fournissent des informations utiles pour la gestion de la ressource et aident à prévoir les changements à venir concernant les espèces exploitées commercialement.] Une population de tanaidacés Kalliapseudes schubartii Mañé-Garzón, 1949 a été échantillonnée mensuellement dans une lagune tropicale du sud-est du Brésil afin d'étudier son cycle de vie. Les résultats montrent une variation saisonnière de la densité, celle-ci augmentant au début de la saison des pluies et présentant des pics à la suite des précipitations pour les autres périodes de l'année. Les densités mesurées varient avec le changement de stade larvaire à juvénile. Les femelles sont plus grandes que les individus mâles, la taille de celles-ci au début de la maturité sexuelle est de 5,9 mm. Le «sex-ratio» apparaît déséquilibré pour chaque mois avec une prédominance des individus femelles, ce qui concorde avec des études réalisées chez la même 3 )

Life history and population dynamics of the enigmatic tanaid Chondrochelia dubia (Tanaidacea: Leptocheliidae) in a tropical seaweed bed

“…The year-long presence of reproductive adults and juveniles indicates continuous reproductive activity, a common pattern observed in many crustacean species, especially in the tropics (Pandian 2016, Pennafirme andSoares-Gomes 2009). Specimens in Paiva Beach are much smaller (2.04±0.95 mm in length) than other tanaid species from the southwestern Atlantic (Table 2), and their natural mortality is relatively high.…”

“…C. dubia also has multiple short cohorts, a relatively high growth rate (k) and a short lifespan (<11 months). All of these features indicate that it has a short and opportunistic life strategy (Pennafirme and Soares-Gomes 2009).…”

Apseudopsis adami, a new species of tanaidacean (Crustacea: Peracarida) from the NW Iberian Peninsula: postmarsupial development and remarks on morphological characters

“…Male dimorphism is common among tanaidaceans (see for example Gardiner 1973;Sieg 1978;Messing 1983;Vengayil et al 1988;Pereira Leite and Pereira Leite 1997;Schmidt et al 2002;Pennafirme and Soares-Gomes 2009). Secondary males have been shown to derive from protogynous development in some cases (Lang 1958;Gardiner 1975), while in other species, they derive from males I which are simply subadults (Bamber 2010), and in other cases, all types of males are reproductive (Hamers and Franke 2000;Fonseca and D'Incao 2003).…”

Comparison of life history traits of Tanais dulongii (Tanaidacea: Tanaididae) in natural and artificial marine environments of the south-western Atlantic

“…Several aspects of the biology of this species have been studied, such as behaviour, development, reproduction, morphometry and population dynamics (Johnson and Attramadal 1982a, b;Borowsky 1983;Perez-Ruzafa and Sanz 1993;Hamers and Franke 2000;Rumbold et al 2012Rumbold et al , 2014Rumbold et al , 2015, but interpopulational comparative studies are scarce (Pennafirme and Soares-Gomes 2009;Rumbold et al 2014). Recent works have established that populations of T. dulongii that live in two contrasting habitats differed in morphometry and relative growth patterns (Rumbold et al 2014), but differences in reproductive aspects (e.g.…”