Vertical Migrations and Feeding Rhythms of Acartia clausi and Pseudodiaptomus hessei (Copepoda: Calanoida) in a Tropical Lagoon (Ebrié, Côte d'Ivoire)

Kouassi, Ernest; Pagano, Marc; Saint‐Jean, Lucien; Arfi, Robert; Bouvy, Marc

doi:10.1006/ecss.2001.0769

Cited by 44 publications

(30 citation statements)

References 27 publications

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“…Adults of this genus live close to the bottom during the day, and males and females may show different emergence patterns at night (e.g. Jacoby & Greenwood 1989, Kouassi et al 2001). …”

Section: Effects Of Vertical Migration and Emergence On Sex Ratiosmentioning

confidence: 99%

No evidence of predation causing female-biased sex ratios in marine pelagic copepods

Gusmão¹,

McKinnon²,

Richardson³

2013

Mar. Ecol. Prog. Ser.

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Although sex ratios close to unity are expected in dioecious species, biased sex ratios are common in nature. It is essential to understand causes of skewed sex ratios in situ, as they can lead to mate limitation and have implications for the success of natural populations. Femaleskewed sex ratios are commonly observed in copepods in situ. Here we discuss the challenges of copepod sex ratio research and provide a critical review of factors determining copepod sex ratios, focusing on 2 main objectives. The first is a critique of the male predation theory, which is currently the main process thought to be responsible for female-skewed sex ratios. It assumes that males have higher mortality because of increased vulnerability to predation during their search for mates. We show that there is little support for the male predation theory, that sex ratios skewed toward females occur in the absence of predation, that sex ratios are not related to predation pressure, and that where sex-skewed predation does occur, it is biased toward females. Our second objective is to suggest alternative hypotheses regarding the determination of sex ratios. We demonstrate that environmental factors, environmental sex determination and sex change have strong effects on copepod sex ratios, and suggest that differential physiological longevity of males and females may be more important in determining sex ratios than previously thought. We suggest that copepod sex ratios are the result of a mixture of factors.

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“…Adults of this genus live close to the bottom during the day, and males and females may show different emergence patterns at night (e.g. Jacoby & Greenwood 1989, Kouassi et al 2001). …”

Section: Effects Of Vertical Migration and Emergence On Sex Ratiosmentioning

confidence: 99%

No evidence of predation causing female-biased sex ratios in marine pelagic copepods

Gusmão¹,

McKinnon²,

Richardson³

2013

Mar. Ecol. Prog. Ser.

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“…For sampling in 2009, a 0.2-mm mesh net with a lead attached to the mouth ring was used to collect copepods successfully from the near-bottom zone, because the common brackish-water copepod genus Pseudodiaptomus is known to be almost demersal during the day (e.g. Fancett & Kimmerer 1985, Kouassi et al 2001). Methods of net towing varied according to conditions of sampling sites.…”

Section: Introductionmentioning

confidence: 99%

Zoogeography of planktonic brackish-water calanoid copepods in western Japan with comparison with neighboring Korean fauna

Sakaguchi

Ueda

Ohtsuka

et al. 2011

Plankton Benthos Res

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Brackish-water calanoid copepods, defined as those predominantly inhabiting oligo-and mesohaline waters, were investigated at 45 rivers in western Japan during 2006-2009 to review their faunas and, for comparison, 4 rivers of Korea in 2006. Eight species (Acartia ohtsukai, A. sinjiensis, A. tsuensis, Pseudodiaptomus inopinus, P. ishigakiensis, Sinocalanus sinensis, S. tenellus and Tortanus derjugini) were identified as brackish-water calanoid copepods from Japan. Among them, P. inopinus was most often collected; it occurred in 38 rivers. Acartia tsuensis and A. sinjiensis were also frequent species in Japan. Pseudodiaptomus ishigakiensis discovered from Kyushu Island is new to the mainland of Japan. From the rivers of Korea six species were identified (A. ohtsukai, A. sp., P. inopinus, P. sp., S. tenellus and T. dextrilobatus). Based on the present and previous studies, a total of 13 brackish-water calanoid copepods have been recorded from Japan and Korea, of which eight species, including three continental relicts (A. ohtsukai, S. sinensis and T. derjugini) in Kyushu Island, are common to both regions. Among them, only two species (P. inopinus and S. tenellus) are distributed widely on both Japanese and Korean coasts of the Tsushima (Korea) Strait. This indicates that the faunas of brackish-water calanoid copepods are very different between Japan and Korea despite the short geographical distance (about 170 km) and that the Tsushima Strait has played the role of an effective barrier for their dispersion.

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“…populations in a given region may be attributed to the combined effect of the swimming behaviour that allows regulation of vertical distribution (Kouassi et al 2001); the production of diapause eggs (Castro-Longoria 2001) in response to unfavourable environmental conditions; and life-history traits such as short generation times and high reproductive potential. The evidence that genetic differences occur among allopatric populations of A. clausi implies that population-specific responses to environmental conditions could exist.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent development and somatic growth in two allopatric populations of Acartia clausi (Copepoda: Calanoida)

Leandro¹,

Queiroga²,

Rodríguez-Graña³

et al. 2006

Mar. Ecol. Prog. Ser.

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This study compares the effect of temperature on the post-embryonic development time and weight-specific growth rate in 2 populations of Acartia clausi from different biogeographic areas (northern and southern Europe). Development was followed from nauplius I to adult at 3 temperatures (10, 15 and 18°C) at saturating food conditions. The relationship between development time and temperature was established by fitting Belehradek's function. The northern population had a shorter generation time at all temperatures. At 10°C, the development time was estimated to be 33.9 and 36.4 d decreasing to 16.3 and 17.4 d at 18°C for the northern and southern populations, respectively. Prosome length decreased with temperature, and the southern population had longer individuals at all temperatures. ANCOVA revealed a significant (p < 0.001) positive effect of temperature on the growth rates, and nauplii grew faster than copepodites (except at 18°C in the southern population and 20°C in the northern population). Significant differences between populations were noted during larval growth, with nauplii from the north growing faster at high temperatures (18°C). The results indicate that the 2 A. clausi allopatric populations subjected to different temperature regimes have different temperature responses, in particular at high temperatures.KEY WORDS: Temperature · Development time · Weight-specific growth rate · Acartia clausi · Ria de Aveiro (Portugal) · Gullmarsfjord (Sweden)Resale or republication not permitted without written consent of the publisher

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Vertical Migrations and Feeding Rhythms of Acartia clausi and Pseudodiaptomus hessei (Copepoda: Calanoida) in a Tropical Lagoon (Ebrié, Côte d'Ivoire)

Cited by 44 publications

References 27 publications

No evidence of predation causing female-biased sex ratios in marine pelagic copepods

No evidence of predation causing female-biased sex ratios in marine pelagic copepods

Zoogeography of planktonic brackish-water calanoid copepods in western Japan with comparison with neighboring Korean fauna

Temperature-dependent development and somatic growth in two allopatric populations of Acartia clausi (Copepoda: Calanoida)

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