Reproductive and life cycle strategies in egg-carrying cyclopoid and free-spawning calanoid copepods

Kiørboe, Thomas; Sabatini, Marina Elena

doi:10.1093/plankt/16.10.1353

Cited by 152 publications

(90 citation statements)

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“…Both sexes of A. tonsa had convoluted swimming tracks, with motility length scales similar to the encounter length scale, which reduces mate encounter rates. On the other hand, A. tonsa is particularly sensitive to hydrodynamic signals, compared to other copepods (Fields and Yen 1997;Kiørboe et al 1999), allowing for detection of mates over relatively long distances (Bagøien and Kiørboe in press b). At the same time, predator avoidance is optimized, both in terms of motility behavior and in the efficiency by which approaching predators are detected from their hydromechanical signals.…”

Section: Discussionmentioning

confidence: 99%

Motility patterns and mate encounter rates in planktonic copepods

Kiørboe

Bagøien

2005

Limnol. Oceanogr.

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Mate encounter rates in pelagic copepods depend on the characteristics of the mate detection mechanism as well as on the motility patterns and concentrations of males and females. We describe male and female motility patterns in two species (Centropages typicus and Pseudocalanus elongatus) in which the females excrete male-attracting pheromones and in one species (Acartia tonsa) in which the mates are detected by hydromechanical signals. For both pheromone-producing species, male and female motilities differ strongly; males are more directionally persistent and swim as fast as or faster than the females, and only at scales exceeding several centimeters do the male motilities resemble random walk. This prevents resampling of the same volume at the scale of encounter and maximizes the rate at which males encounter female signals. In contrast, female motility patterns are more similar to random walk, even at small scales. For the species depending on hydrodynamic cues and in which detection is practically symmetrical between the mates, male and female motilities are similar and can both be described as random walk, also at small scales. We develop simple encounter models and utilize information on motility patterns and mate signaling from our own observations and the literature to estimate search volume rates for pelagic copepods ranging between 0.6-3.0 mm in length. We show that pelagic copepods are capable of searching tens to thousands of liters of ambient water for mates daily, that search capacity increases approximately with the cube of copepod length for both chemical and hydrodynamic signalers, and that these impressive mate search volume rates are sufficient to sustain populations at typical adult densities.

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Section: Discussionmentioning

confidence: 99%

Motility patterns and mate encounter rates in planktonic copepods

Kiørboe

Bagøien

2005

Limnol. Oceanogr.

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“…Female weights were predicted from a length-dry weight equation obtained using a mixture of females from both species at times when females were rich in lipids: log DW = -8.459 + 3.203 log PL (r 2 = 0.95, n = 16), where DW is dry weight (µg) and PL is prosome length (µm). Female dry weights were determined to ± 0.1 µg using a Cahn Microbalance on pre-weighted pans, after drying at 55°C for 24 h. Egg weight was predicted from egg diameter, assuming a density of 0.14 ng C µm -3 (Kiørboe & Sabatini 1994). Egg carbon was converted to ash-free dry weight (AFDW) assuming carbon as 40% of AFDW, and AFDW was assumed to be 90% of dry weight (Hirst & Bunker 2003).…”

Section: Methodsmentioning

confidence: 99%

The paradox of Metridia spp. egg production rates: a new technique and measurements from the coastal Gulf of Alaska

Hopcroft

Clarke²,

Byrd³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…Egg weight for Acartia bifilosa was estimated to be 0.04 µg C egg -1 , based on the measured average egg diameter of 83 µm, and assuming a density of 0.14 ng C µm -3 (Kiørboe & Sabatini 1994). The carbon content of a female was estimated from the length-carbon regression:…”

Section: Methodsmentioning

confidence: 99%

Relationships between nucleic acid levels and egg production rates in Acartia bifilosa: implications for growth assessment of copepods in situ

Gorokhova¹

2003

Mar. Ecol. Prog. Ser.

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To evaluate the applicability of RNA-based indices in copepod growth assessment, concentrations of nucleic acids in Acartia bifilosa were calibrated against growth rates estimated via egg production experiments, and the relationships between levels of RNA, DNA, and the RNA:DNA ratio and growth rates were examined. Furthermore, to investigate effects of temperature and food availability on the relationships between weight-specific fecundity and nucleic acid levels, incubations were carried out at 9 and 16°C, each at 3 food concentrations. There were positive relationships between nucleic acid concentrations and their ratios and weight-specific egg production rates. Overall, RNA concentration was the best predictor of specific growth rate. No correlations between either of the measured variables and female body size were observed. When egg production was elevated by manipulating the feeding regime, RNA concentration and the RNA:DNA ratio increased in concert. Neither growth nor RNA indices were significantly affected by temperature, while a significant increase in DNA concentrations was observed at high food levels and low temperatures. The lack of temperature dependence in RNA-growth relationships allows their direct application for in situ growth estimates in summer populations of A. bifilosa in the northern Baltic Proper.KEY WORDS: Nucleic acid concentrations · RNA:DNA · Growth rate · Egg production · Weight-specific fecundity · Baltic · Acartia bifilosa Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 262: [163][164][165][166][167][168][169][170][171][172] 2003 tested the applicability of nucleic acid analysis for growth rate assessment using RNA concentrations (Dagg & Littlepage 1972, Ota & Landry 1984, Båmstedt & Skjodal 1980 or RNA:DNA values (Wagner et al. 1998(Wagner et al. , 2001) of mono-or multispecies zooplankton samples. Although most of the early studies focused on using RNA:DNA ratios as an index of nutritional condition (Wagner et al. 1998), a calibration of zooplankton growth rates against nucleic acid content has also been attempted, and linear relationships have been found between growth rate and RNA content (and/or RNA:DNA ratio) for various species of marine copepods (Nakata et al. 1994, Saiz et al. 1998, Wagner et al. 2001) and freshwater cladocerans (Vrede et al. 2002). In some cases, however, the relationship between RNA content and growth rate has been found to lack sufficient predictability (Dagg & Littlepage 1972, Ota & Landry 1984. Of great interest, therefore, are the 'rules' used to estimate growth from nucleic acid measurements, and these need to be defined. For example, it has been shown that temperature influences the relationship between RNA and growth in copepods (Saiz et al. 1998, Wagner et al. 2001) and lobsters (Juinio et al. 1992), while a correlation was found between body size and the RNA:protein ratio in squid (Moltschaniwskyj & Jackson 2000), and between developmental stage and RNA-based indices in copepods (Wa...

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Reproductive and life cycle strategies in egg-carrying cyclopoid and free-spawning calanoid copepods

Cited by 152 publications

References 0 publications

Motility patterns and mate encounter rates in planktonic copepods

Motility patterns and mate encounter rates in planktonic copepods

The paradox of Metridia spp. egg production rates: a new technique and measurements from the coastal Gulf of Alaska

Relationships between nucleic acid levels and egg production rates in Acartia bifilosa: implications for growth assessment of copepods in situ

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