Acta Adriatica, Vol. 63 No. 2, 2022.
Original scientific paper
https://doi.org/10.32582/aa.63.2.5
Copepod community from Arctic to Antarctic: large–scale patterns of naupliar and postnaupliar distribution and abundance in the epipelagic layer revealed by citizen science
Frano Kršinić
; Institute of Oceanography and Fisheries, Šetalište Ivana Meštrovića 63, 21000 Split, Croatia
Olja Vidjak
; Institute of Oceanography and Fisheries, Šetalište Ivana Meštrovića 63, 21000 Split, Croatia
Abstract
The use of citizen science and opportunity sampling during commercial or tourist voyages can
provide valuable insights into the structuring of the marine plankton community in broad biogeographic areas.
With the goal of studying the distribution and abundance of smaller zooplankton
using citizen science approach, plankton samples were collected at 33 stations spanning from the
Arctic to Antarctic during the cruise of the S/V “Croatian Tern” (1994-1997), using vertical tows
with a 53µm mesh size Nansen net in the upper epipelagic layer. In this study, we summarize the
observed distribution patterns of planktonic copepods by ontogenetic stages (nauplii, copepodites,
adults) and by postnaupliar assemblages (calanoids, oithonids, oncaeids, harpacticoids, corycaeids),
reporting also on the numerical ratio of nauplii to postnaupliar copepods, as an important
indicator of the stability of copepod reproduction. The highest abundances of total copepods were
found in the northeastern and southeastern Pacific, while the lowest values were found in the Mediterranean
Sea and Southern Ocean. Overall, the copepod community was dominated by naupliar
stages, while most postnaupliar assemblages (calanoids, oithonids, and oncaeids) were dominated
by copepodites. Spatially, nauplii and postnaupliar oithonids showed similar latitudinal patterns,
with both assemblages dominating in high latitudes of temperate zones on both sides of the equator,
while contributions of calanoids, oncaeids, and corycaeids increased at lower latitudes. The ratio
of nauplii to postnauplii varied from 1.1 to 6.4, and only at five stations was it slightly < 1. Latitudinally,
the median values of this ratio varied from 1.1 in the marginal Arctic to 3.1 in the South
Pacific, with no statistically significant differences among areas. The sudden change in nauplii/
postnauplii ratio could signal disturbances in the copepod community, provided that the average
values are determined for all marine areas under different productivity conditions.
Keywords
copepods; nauplii; biogeography; latitudinal change; citizen science
Hrčak ID:
289613
URI
Publication date:
30.12.2022.
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