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JPR Advance Access originally published online on September 21, 2006
Journal of Plankton Research 2006 28(12):1199-1216; doi:10.1093/plankt/fbl050
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Egg production rates and stage-specific development times of Clausocalanus furcatus (Copepoda, Calanoida) in the northern Gulf of Mexico

Hongsheng Bi*,{dagger} and Mark C. Benfield

Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA {dagger} Present Address: Cooperative Institute for Marine Resources Studies, Hatfield Marine Science Center, 2030 SE Marine Science Dr, Newport, OR 97365, USA

* Corresponding Author: hongsheng.bi{at}noaa.gov

Received on April 5, 2006; revised on August 4, 2006; accepted on September 18, 2006

Communicating editor: R.P. Harris


  Abstract

The calanoid copepod Clausocalanus furcatus is widely distributed in tropical and subtropical oceans, yet knowledge of its reproduction and development remains limited. We estimated egg production rates and stage-specific development times from laboratory incubations and field samples collected at a petroleum platform in the northern Gulf of Mexico. Egg production experiments were performed in 2002 and 2003 at a laboratory on the platform using freshly collected female copepods. Median stage development durations were also measured during the incubations. Logistic regression models were used to estimate median stage durations. The median development times of Clausocalanus furcatus from hatching to adulthood ranged from ~13 to 20 days. Field samples were collected from waters beneath the platform at 12-h intervals using a 30-L Niskin water bottle during March–April and May–June 2003, and the Edmonson egg ratio method was used to estimate the mean in situ egg production rate. This field-derived mean egg production rate was significantly lower than the 12.08 eggs female–1 day–1 measured from incubation experiments, and this difference may reflect high in situ egg mortality. In situ egg production rates also showed high variability and were almost five times higher during March–April compared to May–June.


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