Benthic Habitats along 4B05 Transect at Tutum Bay, Feni Islands, PNG

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Benthic Habitats along 4B05 Transect at Tutum
Bay, Feni Islands, PNG

• May 27-June 5, 2005

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Transect 4B05 Vent 4 (1m site)
Depth 8.7 m Interface pH 6.1-6.4 Temperature
Sediment surface 30.3 (Tidbit)
82.5-84.3 (Hobo w/ probe) 10 cm
deep Description Volcanic and altered cobbles
coral and flower coral in the immediate
vicinity Rubble samples scrubbed from volcanic
cobbles
Thomas with seepage meter
Darcys incubator in vent
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Transect 4B05 Vent 4
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Transect 4B05 7.5 m from vent
Depth 9.6 m Interface pH 6.2 Temperature
Sediment surface 54.9-65.0 (Hobo w/ probe)
10 cm deep Description Fine to medium volcanic
and altered sands, volcanic cobbles Rubble
sample from adjacent reef
Transect marker, HOBO, caging experiment
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Transect 4B05 12-15 m from vent
Depth 9.6 m Interface pH 5.9 Temperature
Sediment surface 36.6-47.7 (Hobo) (apparently
moved large instantaneous displacement of
values) 10 cm deep Description Fine to
medium volcanic and altered sands Rubble sample
from adjacent reef Hobo temp logger Caging
experiment at 15m
Caging experiment at 15 m
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Transect 4B05 30 m from vent
Depth 9.9 m Interface pH 6.4-6.7
Temperature Sediment surface 30.2
(Tidbit) 29.6-31.7 (Hobo) 10 cm
deep Description Medium volcanic and altered
sands, minimal carbonate Rubble sample from
adjacent reef
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Transect 4B05 Rubble and reef lt60 m from vent
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Transect 4B05 60 m from vent
Depth 11.4 m Interface pH 7.1-7.2 Temperature
Sediment surface 30.3 (Tidbit) 10 cm
deep Description Medium volcanic and altered
sands, minimal carbonate Rubble sample from
adjacent reef
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Transect 4B05 90 m from vent
Depth 12.0 m Interface pH 7.8-8.0 Temperature
Sediment surface 30.8 (Tidbit, 80m) 30.7
(Tidbit, 100m) 10 cm deep Description
Medium volcanic and altered sands, bits of
carbonate around burrows algal-bacterial mat
observed Rubble sample from adjacent reef
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Transect 4B05 120-140 m from vent
Depth 13.2 m Interface pH 7.7 Temperature
Sediment surface 30.4-35.8 (Tidbit,
120m) 30.1-40.9 (Tidbit, 140m) 10 cm
deep Description Medium volcanic and altered
sands, some carbonate visible throughout, esp.
around burrows Rubble sample from adjacent reef
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Transect 4B05 rubble/reef 120 m from vent
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Transect 4B05 150 m from vent
Depth 15.0 m Interface pH 7.9 Temperature
Sediment surface 29.8 (Tidbit, 160m) 10 cm
deep Description Medium volcanic and altered
sands, bits of carbonate scattered in sand and
especially prevalent around burrows Rubble
sample from adjacent reef
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Transect 4B05 180 m from vent
Depth 17.4 m Interface pH 8.0 Temperature
Sediment surface 29.7 (Tidbit) 10 cm
deep Description Medium volcanic and altered
sands, more carbonate scattered in sand and
especially prevalent around burrows and
accentuating sand waves Rubble samples from
transect
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Transect 4B05 200 m from vent
Depth 19.0 m Interface pH 8.0 Temperature
Sediment surface 10 cm deep Description
Medium volcanic and altered sands with
significant carbonate including larger forams and
Halimeda plates Rubble samples from transect
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Transect 4B05 210 m from vent
Depth 20.3 m Interface pH 7.9-8.0 Temperature
Sediment surface 29.8 (Tidbit) 10 cm
deep Description Medium volcanic and altered
sands with significant carbonate including larger
forams and Halimeda plates Rubble sample from
transect
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Transect 4B05 240 m from vent
Depth 22.7 m Interface pH 7.9-8.0 Temperature
Sediment surface 29.5 (Tidbit) 10 cm
deep Description Open carbonate sandy plain
with medium-fine volcanic and altered sands, no
relief, some slope Rubble sample from transect
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Transect 4B05 270 m from vent
Depth 24.9 m Interface pH 7.9-8.0 Temperature
Sediment surface 29.3 (Tidbit) 10 cm
deep Description Medium-fine volcanic and
altered sands and unsorted carbonate including
larger forams and Halimeda plates abundant
rubble, often sponge-bound lumps low topography
except for some low coral heads and barrel
sponges Rubble samples from transect
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Transect 4B05 300 m from vent
Depth 28.1 m Interface pH 7.7-7.8 Temperature
Sediment surface 29.6 (Tidbit) 10 cm
deep Description Unsorted carbonates with
medium-fine volcanic and altered sands, including
larger forams and Halimeda plates abundant
rubble, often sponge-bound lumps low topography
with noticeable slope, sponge-algal
complexes Rubble samples from transect
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Transect 4B05 Cage-control site
Depth 10 m Interface pH 8.0 Description Reef
structure with large coral heads and flat sandy
and rubble areas where calcarinids, soritids and
amphisteginids were visibly abundant
cage-controls were deployed here
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Transect 4B05 South control site
Depth 15 m Interface pH 8.1 Temperature
Sediment surface 29-30 Description Reef apron
of unsorted carbonates with some medium-fine
volcanic and altered sands abundant
rubble Rubble and sediment samples
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