Diel changes in the egg production rate of Acartia tonsa (Copepoda, Calanoida) and related environmental factors in two estuaries

Stearns, DE; Tester, PA; Walker, R.S.

doi:10.3354/meps052007

Cited by 48 publications

(26 citation statements)

References 13 publications

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“…This behavior is probably related not only to species-specific temperature tolerance ranges but also to maternal history. In agreement with previous studies (STEARNS et al, 1989;TESTER;TURNER 1990, TISELIUS et al, 1995, our findings suggest that the reproductive traits of A. tonsa are strongly associated with the nutritional history of the females. Females collected during winter (in situ temperature 6-10°C), showed higher mean EP at both experimental temperatures than those collected in spring with favorable in situ temperatures (14 -16°C).…”

Section: Resultssupporting

confidence: 82%

“…This is in agreement with the findings of Sabatini (1989), who suggested a decrease in the egg production rate of A. tonsa during the cold season as a factor contributing to the population decline in the BBE. A similar trend was observed in A. tonsa and species of the same genus in other estuaries worldwide (AMBLER, 1985;STEARNS et al, 1989;WHITE;ROMAN, 1992;DUTZ et al, 2004;JUNG et al, 2004). On the other hand, the incubation temperature of 18 ± 1°C benefited the fecundity of the wild females.…”

Section: Resultssupporting

confidence: 52%

“…These threshold values established the minimum and maximum abundance levels of this species in Puerto Cuatreros (SABATINI, 1989;HOFFMEYER et al, 2008). Experimental incubations, at higher densities (STOTTRUP et al, 1986) than those recorded during the warm season, were carried out without previous acclimation in order to take the influence of the female's recent history into account (GONZÁLEZ, 1974;BÅMSTEDT, 1980;STEARNS et al, 1989;TESTER;TURNER, 1990;TISELIUS et al, 1995). Ten females and one male were placed in a Petri dish containing 100 ml of filtered seawater (salinity 32 -33.5) with ≥60 µm of in situ seston as food.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

et al. 2014

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A B S T R A C TThe copepod Acartia tonsa plays an important role in the food web of many estuaries influenced by changes due to anthropic activities, hence it is relevant to know its reproductive plasticity under stressful conditions. We examined the influence of thermal shift (6 ± 1ºC and 18 ± 1ºC) and overcrowding stress on egg production and hatching success in wild females of A. tonsa of the Bahía Blanca Estuary. Egg production rate (EP), hatching success during seven days (E7 %) and time taken to hatch 50 % of eggs (T 50) were registered. The high individual density used in the incubations caused a decrease in EP values at both temperatures. Nevertheless, all the females responded favorably to 18°C. EP and E7 % obtained at both temperatures were significantly different the values at 18ºC, being twice as high as those obtained at 6°C. T 50 values at 18ºC indicated a shorter developmental time in eggs from spring females, whereas the opposite effect was observed in eggs from winter females. Our results indicate that the reproductive performance is affected by short exposures to thermal shift. The pattern of egg production and hatching is also modified in accordance with the maternal history. R E S U M OO copépode Acartia tonsa desempenha um papel importante na teia trófica de muitos estuários influenciados por atividade antrópica, e por esse motivo torna-se relevante conhecer sua plasticidade nos processos reprodutivos de espécies sob condições estressantes. Examinamos a influência de dois estressores, mudança térmica (6 ± 1ºC e 18 ± 1ºC) e superpopulação, na produção de ovos e sucesso da incubação em fêmeas selvagens de A. tonsa provenientes do estuário de Bahía Blanca. A taxa de produção de ovos (EP), o sucesso de incubação durante sete dias (E7%) e o tempo gasto para eclodir 50% dos ovos (50 T) foram registrados. A alta densidade de indivíduos usada na incubação causou diminuição nos valores de EP em ambas as temperaturas. No entanto, todas as fêmeas responderam favoravelmente a 18 °C. Os valores EP e E7% obtidos em ambas as temperaturas foram significativamente diferentes a 18°C, sendo duas vezes mais elevados do que aqueles obtidos a 6°C. Valores de T 50 em 18°C indicaram um menor tempo de desenvolvimento dos ovos das fêmeas de primavera, enquanto o efeito oposto foi observado em ovos das fêmeas de inverno. Nossos resultados indicam que o desempenho reprodutivo é afetado pela exposição curta à mudança térmica, e o padrão de produção de ovos e a incubação são também modificados de acordo com a história materna.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 52%

Section: Methodsmentioning

confidence: 99%

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Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

et al. 2014

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“…vertical migration) may add to a wide variability in food quality on a circadial scale. For small copepods the time to produce eggs is close to 24 h (Kiørboe et al 1985, Stearns et al 1989, Tester & Turner 1990). It is not obvious which effect temporal variability in food quality would have on EPR and EHS, although responses can be expected to integrate the feeding conditions during that period.…”

Section: Abstract: Acartia Clausi · Reproduction · Food Quality · DImentioning

confidence: 99%

Feeding and reproduction in a small calanoid copepod: Acartia clausi can compensate quality with quantity

Calliari¹,

Tiselius²

2005

Mar. Ecol. Prog. Ser.

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“…Especially in estuaries the distribution of zooplankton depends largely upon the physical and dynamic characteristics of the water. Relations between plankton and environment in estuarine areas have been studied by several authors, by analyzing the distribution of species in relation to horizontal and vertical environmental gradients (Maurer et al, 1978;Collins and Williams, 1982;Stearns et al, 1989;Hough and Naylor, 1991;Madariaga et al, 1992;Dodson, 1993, 1994). More recently the effect of wind on fish larvae (Govoni and Pietrafesa, 1994) and on dispersal dynamics of postlarval macrofauna of benthic systems (Commito, 1995) was introduced in models as an explanatory variable.…”

Section: Introductionmentioning

confidence: 99%

Wind effect as forcing factor controlling distribution and diversity of copepods in a shallow temperate estuary (Solis Grande, Uruguay)

Gómez-Erache¹,

Norbis²,

Bastreri³

2000

Sci. Mar.

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Diel changes in the egg production rate of Acartia tonsa (Copepoda, Calanoida) and related environmental factors in two estuaries

Cited by 48 publications

References 13 publications

Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

Feeding and reproduction in a small calanoid copepod: Acartia clausi can compensate quality with quantity

Wind effect as forcing factor controlling distribution and diversity of copepods in a shallow temperate estuary (Solis Grande, Uruguay)

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