Abstract
We present the first comparative study of the stage-specific patterns of mortality of Calanus and Pseudocalanus, two widely distributed genera that are representative of a relatively large-bodied, broadcast spawning calanoid copepod and a relatively small-bodied, egg-brooding calanoid. The study site is Georges Bank, a continental shelf locality in the Northwestern Atlantic with retentive circulation that renders it suitable for studies of population dynamics. Based on extensive mortality estimates from 30 cruises, we find that co-occurring Calanus finmarchicus and Pseudocalanus spp. have markedly different patterns of stage-specific mortality, the former bimodal and the latter relatively uniform with respect to developmental stage. Neither taxon exhibits a monotonic decline in mortality with developmental stage, nor are rates of mortality predictable in a useful manner by copepod body size or by ambient temperature. Young stages of the broadcast-spawning C. finmarchicus show conditional density-dependence of mortality rates, i.e. mortality rates are independent of population density when adult females are low in abundance but positively related to population density at high female abundances. This density-dependence, which is probably attributable to egg cannibalism, introduces a quadratic mortality term into population dynamic models. The egg-brooding Pseudocalanus spp., in contrast, show no evidence of density-dependent mortality. The two taxa illustrate a life history trade-off: the broadcast-spawning Calanus exhibits birth rates that are greatly elevated with respect to those of Pseudocalanus, but there is a compensatory cost in very low survivorship of the freely spawned eggs. Both the high fecundity, high mortality life history of Calanus and the low fecundity, low mortality life history of Pseudocalanus appear to have approximately equal fitness in this study site.
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Aksnes, D. L., C. B. Miller, M. D. Ohman & S. N. Wood, 1997. Estimation techniques used in studies of copepod population dynamics — a review of underlying assumptions. Sarsia 82: 279-296.
Aksnes, D. L. & M. D. Ohman, 1996. A vertical life table approach to zooplankton mortality estimation. Limnol. Oceanogr. 41: 1461-1469.
Berryman, A. A., 1991. Vague notions of density-dependence. Oikos 62: 252-254.
Bucklin, A., M. Guarnieri, D. J. McGillicuddy & R. S. Hill, 2001. Spring evolution of Pseudocalanus spp. abundance on Georges Bank based on molecular discrimination of P. moultoni and P. newmani. Deep-Sea Res. II 48: 589-608.
Campbell, R. G., J. A. Runge & E. G. Durbin, 2001b. Evidence for food limitation of Calanus finmarchicus production rates on the southern flank of Georges Bank during April 1997. Deep-Sea Res. II 48: 531-549.
Campbell, R. G., M. M. Wagner, G. J. Teegarden, C. A. Boudreau & E. G. Durbin, 2001a. Growth and development of the copepod Calanus finmarchicus reared in the laboratory. Mar. Ecol. Prog. Ser. 221: 161-183.
Cleveland, W. S. & S. J. Devlin, 1988. Locally-weighted regression: an approach to regression analysis by local fitting. J. am. Stat. Assoc. 83: 596-610.
Concelman, S., S. M. Bollens, B. K. Sullivan, L. P. Madin, E. Horgan, M. Butler & D. van Keuren, 2001. Distribution, abundance and benthic-pelagic coupling of suspended hydroids on Georges Bank. Deep-Sea Res. II 48: 645-658.
Corkett, C. J. & I. A. McLaren. 1978. The biology of Pseudocalanus. Adv. mar. Biol. 15: 1-231.
Crain, J. A. & C. B. Miller, 2001. Effects of starvation on intermolt development in Calanus finmarchicus copepodites: a comparison between theoretical models and field studies. deep-Sea Res. II 48: 551-566.
Davis, C. S., 1984a. Food concentrations on Georges Bank: non-limiting effect on development and survival of laboratory reared Pseudocalanus sp. and Paracalanus parvus (Copepoda: Calanoida). Mar. Biol. 82: 41-46.
Davis, C. S., 1984b. Predatory control of copepod seasonal cycles on Georges Bank. Mar. Biol. 82: 31-40.
Davis, C. S., 1987. Components of the zooplankton production cycle in the temperate ocean. J. mar. Res. 45: 947-983.
Durbin, E. G., P. R. Garrahan & M. C. Casas, 2000a. Abundance and distribution of Calanus finmarchicus on the Georges Bank during 1995 and 1996. ICES J. mar. Sci. 57: 1664-1685.
Durbin, E. G., P. R. Garrahan & M. C. Casas, 2000b. Depth distribution of Calanus finmarchicus nauplii on the Georges Bank during 1995 and 1996. ICES J. mar. Sci. 57: 1686-1693.
Durbin, T., J. Runge, M. Wagner, B. Niehoff & A. Sell, 1999. Cruise report. R/V Endeavor cruise 322 to Georges Bank, 17 April-2 May 1999. U.S. GLOBEC NW Atlantic/Georges Bank study: 1-32.
Edwards, A. M. & A. Yool, 2000. The role of higher predation in plankton population models. J. Plankton Res. 22: 1085-1112.
Eiane, K., D. L. Aksnes & M. D. Ohman, 1998. Advection and zooplankton fitness. Sarsia 83: 87-93.
Eiane, K., D. L. Aksnes, M. D. Ohman, S. Wood & M. B. Martinussen, 2002. Stage-specific mortality of Calanus spp. under different predation regimes. Limnol. Oceanogr. 47: 636-645.
Fasham, M. J. R., 1995. Variation in the seasonal cycle of biological production in subarctic oceans: a model sensitivity analysis. Deep Sea Res. 42: 1111-1149.
Frost, B. W., 1974. Feeding processes at lower trophic levels in pelagic communities. In Miller, C. B. (ed.), The Biology of the Oceanic Pacific. Oregon State University Press, Corvallis: 59-77.
Frost, B. W., 1980. The inadequacy of body size as an indicator of niches in the zooplankton. In Kerfoot, W. C. (ed.), Evolution and Ecology of Zooplankton Communities. The University Press of New England, Hanover: 742-753.
Frost, B. W., 1985. Food limitation of the planktonic marine copepods Calanus pacificus and Pseudocalanus sp. in a temperate fjord. Arch. Hydrobiol. Beih. Ergebn. Limnol. 21: 1-13.
Frost, B. W., 1988. Variability and possible adaptive significance of diel vertical migration in Calanus pacificus, a planktonic marine copepod. Bull. mar. Sci. 43: 675-694.
Frost, B. W., 1989. A taxonomy of the marine calanoid copepod genus Pseudocalanus. Can. J. Zool. 67: 525-551.
Frost, B. W. & S. M. Bollens, 1992. Variability of diel vertical migration in the marine planktonic copepod Pseudocalanus newmani in relation to its predators. Can. J. Fish. aquat. Sci. 49: 1137-1141.
Griffiths, A. M. & B. W. Frost, 1976. Chemical communication in the marine planktonic copepods Calanus pacificus and Pseudocalanus sp. Crustaceana 30: 1-8.
Heath, M. R. & S. H. Coombs (eds), 1999. Investigation of Calanus finmarchicus Migrations Between Oceanic and Shelf Seas off North-west Europe (ICOS). Fish. Oceanogr. 8 (Suppl. 1): 1-176.
Irigoien, X., R. Head, U. Klenke, B. Meyer-Harms, D. Harbour, B. Niehoff, H.-J. Hirche & R. Harris, 1998. A high frequency time series at weathership m, Norwegian Sea, during the 1997 spring bloom: feeding of adult female Calanus finmarchicus. Mar. Ecol. Prog. Ser. 172: 127-137.
Kiøboe, T. & M. Sabatini, 1994. Reproductive and life cycle strategies in egg-carrying cyclopoid and free-spawning calanoid copepods. J. Plankton Res. 16: 1353-1366.
Kiørboe, T. & M. Sabatini, 1995. Scaling of fecundity, growth and development in marine planktonic copepods. Mar. Ecol. Prog. Ser. 120: 285-298.
Landry, M. R., 1983. The development of marine calanoid copepods with comment on the isochronal rule. Limnol. Oceanogr. 28: 614-624.
Lewis, C. V.W., C. Chen & C. S. Davis, 2001. Effect of winter wind variability on plankton transport over Georges Bank. Deep-Sea Res. II 48: 137-158.
Liang, D. & S. Uye, 1997. Population dynamics and production of the planktonic copepods in a eutrophic inlet of the Inland Sea of Japan. 4. Pseudodiaptomus marinus, the egg-carrying calanoid. Mar. Biol. 128: 415-421.
Limeburner, R. & R. C. Beardsley, 1996. Near-surface recirculation over Georges Bank. Deep-Sea Res. II 43: 1547-1574.
Madin, L. P., S. M. Bollens, E. Horgan, M. Butler, J. Runge, B. K. Sullivan, G. Klein-Macphee, E. Durbin, A. G. Durbin, D. van Keuren, S. Plourde, A. Bucklin & M. E. Clarke, 1996. Voracious planktonic hydroids: unexpected predatory impact on a coastal marine ecosystem. Deep-Sea Res. II 43: 1823-1829.
Mauchline, J., 1998. The biology of calanoid copepods. Adv. mar. Biol. 33: 1-701.
McGurk, M. D., 1987. Natural mortality and spatial patchiness: reply to Gulland. Mar. Ecol. Prog. Ser. 39: 201-206.
McLaren, I. A., J.-M. Sévigny & C. J. Corkett, 1989. Temperature-dependent development in Pseudocalanus species. Can. J. Zool. 67: 559-564.
Miralto, A., G. Barone, G. Romano, S. A. Poulet, A. Ianora, G. L. Russo, I. Buttino, G. Mazzarella, M. Laabir, M. Cabrini & M. G. Giacobbe, 1999. The insidious effect of diatoms on copepod reproduction. Nature 402: 173-176.
Myers, R. A. & J. A. Runge, 1983. Predictions of seasonal natural mortality rates in a copepod population using life-history theory. Mar. Ecol. Prog. Ser. 11: 189-194.
Naimie, C. E., R. Limeburner, C. G. Hannah & R. C. Beardsley, 2001. On the geographic and seasonal patterns of the nearsurface circulation on Georges Bank-from real and simulated drifters. Deep-Sea Res. II 48: 501-518.
Ohman, M. D., 1985. Resource-satiated population growth of the copepod Pseudocalanus sp. Arch. Hydrobiol. Beih. Ergebn. Limnol. 21: 15-32.
Ohman, M. D., 1986. Predator-limited population growth of the copepod Pseudocalanus sp. J. Plankton Res. 8: 673-713.
Ohman, M. D., B. W. Frost & E. B. Cohen, 1983. Reverse diel vertical migration: an escape from invertebrate predators. Science 220: 1404-1407.
Ohman, M. D. & H.-J. Hirche, 2001. Density-dependent mortality in an oceanic copepod population. Nature 412: 638-641.
Ohman, M. D. & J. A. Runge, 1994. Sustained fecundity when phytoplankton resources are in short supply: omnivory by Calanus finmarchicus in the Gulf of St. Lawrence. Limnol. Oceanogr. 39: 21-36.
Ohman, M. D. & S. N. Wood, 1995. The inevitability of mortality. ICES J. mar. Sci. 52: 517-522.
Ohman, M. D. & S. N. Wood, 1996. Mortality estimation for planktonic copepods: Pseudocalanus newmani in a temperate fjord. Limnol. Oceanogr. 41: 126-135.
Runge, J. A., 1985. Relationship of egg production of Calanus pacificus to seasonal changes in phytoplankton availability in Puget Sound, Washington. Limnol. Oceanogr. 30: 382-396.
Runge, J. A., 1987. Measurement of egg production rate of Calanus finmarchicus from preserved samples. Can. J. Fish. aquat. Sci. 44: 2009-2012.
Runge, J., E. Durbin, S. Plourde & Y. Gratton, 1997. Spatial and temporal variation in egg production of Calanus finmarchicus on Georges Bank: Implications for the productivity of prey of cod and haddock larvae. ICES CM: 1-13.
Runge, J. A. & J. C. Roff, 2000. The measurement of growth and reproductive rates. In Harris, R. P., P. H. Wiebe, J. Lenz, H. R. Skoldal & M. Huntley (eds.), ICES Zooplankton Methodology Manual. Academic, San Diego: 401-454.
Sell, A. F., D. Van Keuren & L. P. Madin, 2001. Predation by omnivorous copepods on early developmental stages of Calanus finmarchicus and Pseudocalanus spp. Limnol. Oceanogr. 46: 953-959.
Steele, J. H. & B. W. Frost, 1977. The structure of plankton communities. Phil. Trans. Roy. Soc. Lond. B 280: 485-534.
Steele, J. H. & E. W. Henderson, 1992. The role of predation in plankton models. J. Plankton Res. 14: 157-172.
Strong, D. R., 1986. Density-vague population change. Trends Ecol. Evol. 1: 39-42.
Sullivan, B. K. & C. J. Meise, 1996. Invertebrate predators of zooplankton on Georges Bank, 1977–1987. Deep-Sea Res. II 43: 1503-1519.
Tande, K. S. & C. B. Miller (eds), 2000. Population Dynamics of Calanus in the North Atlantic. ICES J. mar. Sci. 57: 1527-1874.
Vidal, J., 1980. Physioecology of zooplankton. II. Effects of phytoplankton concentration, temperature, and body size on the development and molting rates of Calanus pacificus and Pseudocalanus sp. Mar. Biol. 56: 135-146.
Wiebe, P. H. & R. C. Beardsley (eds), 1996. Physical—Biological Interactions on Georges Bank and its Environs. Deep-Sea Res. II 43: 1437-2006.
Wiebe, P. H., R. C. Beardsley, A. C. Bucklin & D. G. Mountain (eds), 2001. Coupled Biological and Physical Studies of Plankton Populations: Georges Bank and Related North Atlantic Regions. Deep-Sea Res. II 48: 1-684.
Wiebe, P. H., A. W. Morton, A. M. Bradley, R. H. Backus, J. E. Craddock, V. Barber, T. J. Cowles & G. R. Flierl, 1985. New developments in the MOCNESS, an apparatus for sampling zooplankton and micronekton. Mar. Biol. 87: 313-323.
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Ohman, M.D., Runge, J.A., Durbin, E.G. et al. On birth and death in the sea. Hydrobiologia 480, 55–68 (2002). https://doi.org/10.1023/A:1021228900786
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DOI: https://doi.org/10.1023/A:1021228900786