Female genital structures in several families of Centropagoidea (Copepoda: Calanoida)

Cuoc, Corinne; Defaye, Danielle; Brunet, Michel; Mazza, Jacques

doi:10.1098/rstb.1998.0238

Cited by 35 publications

(29 citation statements)

References 37 publications

(49 reference statements)

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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.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

Choi¹,

Kimmerer²

2009

Mar. Ecol. Prog. Ser.

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“…Temora species are known to lack seminal receptacles and require frequent remating to produce fertile eggs (e.g. every 3 to 4 d; Ianora et al 1989, Barthelemy et al 1998, Corni et al 2001). The isolation period was also used to acclimate individuals of each species to a common temperature of 18°C (room temperature) and salinity of 36.…”

Section: Methodsmentioning

confidence: 99%

Heterospecific mating and species recognition in the planktonic marine copepods Temora stylifera and T. longicornis

Goetze¹,

Kiørboe²

2008

Mar. Ecol. Prog. Ser.

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Many planktonic copepods use diffusible pheromone or hydromechanical signals to remotely detect the presence of potential mates. To determine whether these mating signals also play a role in species recognition and mate choice, we observed and video recorded (3D) mate-finding and pursuit behaviors in heterospecific and conspecific mating crosses in a pair of congeneric, partially sympatric species (Temora stylifera and T. longicornis) in the laboratory. The species appear to have asymmetrical pre-mating isolation, with T. longicornis males readily pursuing T. stylifera females to mate contact and capture, but with little mate-finding activity observed in the reverse cross. Males of T. longicornis pursuing heterospecific females executed a number of behaviors known to facilitate successful pheromone trail following and mate capture in conspecific mating, including accelerated swimming in a 'signal-scanning' mode to recover a lost pheromone trail, reversal of the tracking direction in cases when the male initiated tracking in the incorrect direction, and accelerated swimming speeds when in the presence of a pheromone signal but prior to locating the trail. Detailed analyses of mate-tracking behavior in T. longicornis male × T. stylifera female crosses gave no indication that males were aware they were pursuing heterospecific females prior to mate contact, indicating that diffusible pheromone and hydromechanical signals are not used, either singly or in combination, for species recognition in this mating pair. Heterospecific mating attempts among sympatric, congeneric copepods may commonly proceed to mate capture, and incur fitness costs to either or both mating partners. KEY WORDS: Mate choice · Behavioral isolation · Mating asymmetry · Diffusible pheromone · Hydromechanical signalsResale or republication not permitted without written consent of the publisher

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“…Some copepod families (within the Diaptomoidea) require repeat mating because they are unable to store sperm and often have near equitable sex ratios [17,18]. Others (many non-Diaptomoidea families) are able to store sperm [19] and can produce multiple batches of eggs from a single copulation event [14,20]. Higher rewards from single mating events may lead males to high mortality risk when mate searching.…”

Section: Introductionmentioning

confidence: 99%

Macroevolutionary patterns of sexual size dimorphism in copepods

Hirst

Kiørboe

2014

Proc. R. Soc. B.

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Major theories compete to explain the macroevolutionary trends observed in sexual size dimorphism (SSD) in animals. Quantitative genetic theory suggests that the sex under historically stronger directional selection will exhibit greater interspecific variance in size, with covariation between allometric slopes (male to female size) and the strength of SSD across clades. Rensch's rule (RR) also suggests a correlation, but one in which males are always the more size variant sex. Examining free-living pelagic and parasitic Copepoda, we test these competing predictions. Females are commonly the larger sex in copepod species. Comparing clades that vary by four orders of magnitude in their degree of dimorphism, we show that isometry is widespread. As such we find no support for either RR or for covariation between allometry and SSD. Our results suggest that selection on both sexes has been equally important. We next test the prediction that variation in the degree of SSD is related to the adult sex ratio. As males become relatively less abundant, it has been hypothesized that this will lead to a reduction in both inter-male competition and male size. However, the lack of such a correlation across diverse free-living pelagic families of copepods provides no support for this hypothesis. By comparison, in sea lice of the family Caligidae, there is some qualitative support of the hypothesis, males may suffer elevated mortality when they leave the host and rove for sedentary females, and their femalebiased SSD is greater than in many free-living families. However, other parasitic copepods which do not appear to have obvious differences in sex-based mate searching risks also show similar or even more extreme SSD, therefore suggesting other factors can drive the observed extremes.

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Female genital structures in several families of Centropagoidea (Copepoda: Calanoida)

Cited by 35 publications

References 37 publications

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

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

Heterospecific mating and species recognition in the planktonic marine copepods Temora stylifera and T. longicornis

Macroevolutionary patterns of sexual size dimorphism in copepods

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