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http://10.0.0.195:8080/dspace/handle/11099/356
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| Title: | Summary of Ichthyoplankton Research by the NOAA Beaufort Laboratory in Florida Bay, Everglades National Park, Florida, USA. |
| Authors: | Powell, Allyn B.
Hoss, Donald E.
Konieczna, Małgorzata
Ejsymont, Leonard |
| ASFA Terms: | Ichthyoplankton
Ichthyoplankton surveys |
| Issue Date: | 2000 |
| Publisher: | Sea Fisheries Institute in Gdynia |
| Citation: | Bulletin of the Sea Fisheries Institute, Gdynia, 3. p. 43-54 |
| Abstract: | This paper summarizes two cooperative research studies between the Plankton Sorting
and Identification Center (PSIC) and the Beaufort Laboratory in Florida Bay. Florida Bay is
a shallow lagoon located for the most part in Everglades National Park, Florida, USA. The bay
is compartmentalized into partially submerged carbonate mud banks, basins, and numerous mangrove
islands. During the last two decades, significant changes have occurred in the bay with
respect to ichthyofauna composition, seagrass abundance, salinity regimes, algal blooms, and
water clarity. Ten larval collecting trips were made between March 1984 and September 1985.
Twenty stations were sampled in Florida Bay and adjacent waters with a 61 cm bongo sampler
fitted with 333 mm mesh nets. Only 11 stations occurred in Florida Bay and were located primarily
along the Florida Keys and western Florida Bay. Four recreational important species were
targeted spotted seatrout (Cynoscion nebulosus, Family Sciaenidae), gray snapper (Lutjanus
griseus, Family Lutjanidae), red drum (Sciaenops ocellatus, Family Sciaenidae), and snook
(Centropomus undecimalis, Family Centropomidae). Spotted seatrout was the only target species
whose larvae were commonly collected. We collected one red drum larvae, no snook larvae,
and 15 potential gray snappers, but because of taxonomic problems, we could not identify the
larval snappers to species. Spotted seatrout spend their entire life in Florida Bay and spawn
mainly in the western Florida Bay. Based on larval collections, which were comprised mainly of
preflexion stage larvae, spawning is minimal in late fall and the winter months, peaks during
mid-to-late spring and continues during the summer at moderate levels, then declines in winter.
One of the most striking patterns observed was the dominance and ubiquitous distribution of
gobiid larvae. They ranked first in abundance at 13-, 16-, and 18- out of 20 stations in 1984-
1985 during spring, summer and fall, respectively. They were dominant in diverse habitats. In
1994-1995 we conducted a comparative study (1984-1985 vs. 1994-1995) to examine changes
in icthyoplankton composition that might have occurred in response to environmental changes
in the bay between 1984-1985 and 1994-1995. We sampled ichthyoplankton using the same
techniques at six of the same stations visited in 1984-1985. We used the non-parametric Kruskal-
Wallis test to compare densities between the two sampling periods. Zooplanktivorus engraulids
made up a larger part of the ichthyoplankton in 1994-95, and their densities are underestimated
as numerous unidentified clupeiforms were most likely engraulids. The most notable change in
engraulid densities was observed in western Florida Bay where seagrass die-off was most pronounced.
Dramatic changes in densities of juvenile engraulids, mainly bay anchovy (Anchoa mitchelli), between 1984-85 and 1994-95 in Florida Bay occurred in concordance with the larval
occurrences (Thayer et al. 1999). Relative to the other commonly collected taxa, there were no
significant differences in densities between the two time periods for larval gobiids, callionymids
or clinids. |
| URI: | http://www.ceemar.org/dspace/handle/11099/356 |
| Related document: | http://www.mir.gdynia.pl/pliki/osrodek/biuletyn/biulet3-00d.pdf |
| ISSN: | 1429-2335 |
| Appears in Collections: | Bulletin of the Sea Fisheries Institute
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