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Stage‐specific mortality of Calanus spp. under different predation regimes
Author(s) -
Eiane Ketil,
Aksnes Dag L.,
Ohman Mark D.,
Wood Simon,
Martinussen Monica B.
Publication year - 2002
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2002.47.3.0636
Subject(s) - planktivore , fjord , predation , biology , zooplankton , invertebrate , ecology , gelatinous zooplankton , abundance (ecology) , population , predator , calanus , fishery , crustacean , oceanography , copepod , phytoplankton , demography , sociology , nutrient , geology
We have applied the population surface method to estimate the mortality rates of eggs, nauplii, and copepodids of Calanus spp. in two Norwegian fjords with contrasting predator guilds. Efforts were concentrated in Lurefjorden on the western coast (sampled weekly from late February to mid‐June), an unusual fjord dominated by invertebrate (tactile) planktivores. In addition, monthly sampling in Sørfjorden was carried out for comparisons. The latter fjord resembles most Western Norwegian fjords in that it contains populations of vertebrate (visual) planktivores but lower abundance of the invertebrate planktivores. In Lurefjorden, mortality of Calanus spp. was high early in life (~0.35 d −1 ), but significantly lower (~0.00 d −1 ) in the early copepodid stages. In Sørfjorden, mortality was rather uniform throughout ontogeny (~0.08 d −1 ). The noted differences are consistent with different patterns of selective predation between the two fjords. Visual predation in SÄrfjorden gave rise to persistent high mortality over the life cycle. Tactile predation in Lurefjorden gave rise to a concave mortality curve for the later developmental stages. Our results indicate that mortality patterns suffered by natural zooplankton populations may differ greatly over short geographical distances, and we suggest that the predator community and mortality patterns must be considered when addressing the spatial and temporal dynamics of zooplankton populations.