Remating in a planktonic marine calanoid copepod

Wilson, Donald F.; Parrish, K. K.

doi:10.1007/bf00351379

Cited by 44 publications

(15 citation statements)

References 3 publications

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“…A significant correlation occurred between sex ratio and the quotient number of eggshumber of females in the short-term Expt 1 (r = 0.73, n = 8). The lower fecundity of copepods of the genus Acartia when the proportion of males decreases has been described by Wilson & Parrish (1971) and Alcaraz (1977), and the control exerted by sex ratio on the population density of A. italica in natural systems by Alcaraz & Wagensberg (1978), The lack of correlation between proportion of male and eggs/female in Expt 2 might be attributable to the reduced fecundity due to food limitation (Checkley 1980).…”

Section: Discussionmentioning

confidence: 76%

Effects of turbulence on the development of phytoplankton biomass and copepod populations in marine microcosms

Alcaraz¹,

Saiz²,

Marrasé³

et al. 1988

Mar. Ecol. Prog. Ser.

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Effects of turbulence on the dynamics of copepods as well as on the development of phytoplankton biomass were studied in 30 dm3 laboratory microcosms. Two experiments were carried out, with different successional stages of the plankton populations, using seawater from the Masnou nautical harbour, 20 km north of Barcelona. Two experimental conditions were established (stirred microcosms with copepods, and unstirred microcosms with copepods). Enclosure of plankton populations was followed by a phytoplankton bloom, which differed in intensity in stirred and unstirred microcosms. Time changes in the abundance of the dfferent developmental stages of copepods (from eggs to adults), sex ratios ( d / P + d ) , fecundty (no. eggs/no. females), total copepod biornass, and the ratio consumers/producers, also differed in stirred and unstirred microcosms. Turbulence seems to reduce consumer biomass through changes in the demographic composition (lower proportion of males and higher development rates) and probably by increasing the metabolic activity of copepods (feeding pressure and excretion rates). The ultimate effect of turbulence would be a reduction of the trophic efficiency of the system, and accelerated turnover rates.

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Section: Discussionmentioning

confidence: 76%

Effects of turbulence on the development of phytoplankton biomass and copepod populations in marine microcosms

Alcaraz¹,

Saiz²,

Marrasé³

et al. 1988

Mar. Ecol. Prog. Ser.

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“…Eurytemora affinis females may have limited capability to store sperm (Barthélémy et al 1998) and appear to require repeated mating to stay fertile (e.g. Heinle 1970, Katona 1975, as has been observed in some (but not all) other copepod species (Wilson & Parrish 1971, Berger & Maier 2001. At low density near the critical density of the population (Fig.…”

Section: Discussionmentioning

confidence: 79%

Mating success and its consequences for population growth in an estuarine copepod

Choi¹,

Kimmerer²

2009

Mar. Ecol. Prog. Ser.

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We conducted experiments on mating success of the estuarine copepod Eurytemora affinis in the San Francisco Estuary, USA. The experimental approach was to isolate virgin pairs (one male and one female) in containers varying in volume from 0.03 to 32 l for 2, 4, or 8 h. Mating was considered successful if viable eggs were produced by individual females subsequently incubated for up to 5 d. The experimental data were analyzed by fitting a 3-parameter model to the data to determine the volume search rate of males. Mating frequencies indicated a volume search rate for E. affinis males of 7.2 ± 4.0 l h -1 (172 ± 96 l d -1, 95% CL), about 20-fold higher than that for Acartia hudsonica previously determined by a similar method. A simple population model showed that the critical population density needed to maintain the E. affinis population can be well below the seasonally low abundance of this copepod in the San Francisco Estuary. The low critical density may allow population persistence in an estuary without the production of resting eggs. KEY WORDS: Copepod mating · Allee effects · Population growth · Volume search rate Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 377: [183][184][185][186][187][188][189][190][191] 2009 (Katona 1973, Griffiths & Frost 1976, van Leeuwen & Maly 1991, Yen et al. 1998. Increasing detection range increases the volume search rate, i.e. the volume searched by males for females per unit time (Kiørboe 2007), which, in turn, reduces the population density needed to prevent mate limitation (Choi & Kimmerer 2008).In the present study, we determined the volume search rate for males of the calanoid copepod Eurytemora affinis and assessed the consequences of this rate for population recovery from low abundance. E. affinis (~1 mm total length) is a dominant species in many temperate estuaries, usually inhabiting lowsalinity areas, and is often associated with the maximum turbidity zone (e.g. Hough & Naylor 1991, Peitsch et al. 2000, David et al. 2005). The copepod is also an important food source for macrozooplankton such as mysids and many estuarine-dependent fishes such as striped bass Morone saxatilis (Burkill & Kendall 1982, Meng & Orsi 1991, Thorp & Casper 2003. E. affinis is capable of producing resting eggs in response to environmental conditions such as temperature, photoperiod, and crowding (Ban & Minoda 1992, Ban 1992. Mating behavior and fertilization have been well documented (Heinle 1970, Katona 1973, Katona 1975. Mate finding in E. affinis is asymmetric in that the female produces a pheromone signal and searches primarily for food, whereas the male detects the pheromone and pursues the female (Katona 1973). It is not well understood, however, how this mating behavior relates to population growth (Kiørboe 2007) and, in particular, how dilute the population can become before it is unable to recover.In the San Francisco Estuary, Eurytemora affinis has historically been abundant and reproductively active throughout the year i...

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“…Low hatching success in autumn could relate to the scarcity of males, as e.g. Acartia tonsa one mating is usually not suYcient (Wilson and Parrish 1971). Otherwise, the complete cessation of reproductive activity at the end of autumn during a time when food was available and initiation of egg production during a time of lowest food concentrations indicate instrinsic control, and an arrested reproductive dormancy (Hirche 1998).…”

Section: Discussionmentioning

confidence: 99%

Overwintering strategies of dominant calanoid copepods in the German Bight, southern North Sea

2006

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Remating in a planktonic marine calanoid copepod

Cited by 44 publications

References 3 publications

Effects of turbulence on the development of phytoplankton biomass and copepod populations in marine microcosms

Effects of turbulence on the development of phytoplankton biomass and copepod populations in marine microcosms

Mating success and its consequences for population growth in an estuarine copepod

Overwintering strategies of dominant calanoid copepods in the German Bight, southern North Sea

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