LTR - Pomacentrids

Version: 23 May 2016
Version Date: 2016-05-23

» Cryptic density dependence: the effects of spatial, ontogenetic, and individual variation in reef fish (CDD_in_Reef_Fish)
Osenberg, CraigUniversity of Georgia (UGA)Principal Investigator, Contact
Frazer, ThomasUniversity of Florida (UF)Co-Principal Investigator
Shima, JeffreyVictoria University of WellingtonInternational Collaborator
Gegg, Stephen R.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Dataset Description

Pomancentrids identity, size and abundance were enumerated around 192 patch reefs. Data were collected in 2003-2006, 2009, 2012, and 2014 at 192 reefs. Beginning in 2012, reefs 129-144 and added reefs 193-198 were manipulated for a project studying the effects of vermetid removals; information pertaining to this manipulation can be found in the project “Spatial patterns of coral-vermetid interactions: short-term effects and long-term consequences”. All data collected on reefs 129-144 and 193-198 beginning in 2012 can also be found under that project. In 2012, additional data were collected – the number of vermetids on each patch reef at the time of this survey. Common Pomancetrids were recognized and size class determined. These data are part of the larger data set describing the biological and physical conditions of the 192 reefs. Together all of these data provide information about the factors that may influence (or be influenced by) Thalassoma and Vermetid.

Location: Moorea, French Polynesia (17.48 degrees S, 149.82 degrees W)

Acquisition Description

Sampling and Analytical Methodology:
A single snorkeler approaches one of the 192 patch reefs (for size of reef, see the physical characteristics file). He or she swam around the reef, recognized and estimated the size of all the common Pomacentrids in broad size categories depending on the species. The rare species were just counted.

Materials: snorkel and dive slate

Processing Description

Data Processing:

BCO-DMO Processing Notes
- Generated from original file "LTR_Pomacentrids.csv" contributed by Rebecca Atkins
- Parameter names edited to conform to BCO-DMO naming convention found at Choosing Parameter Name
- Any blank rows removed

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DATEdate month
ObserverName of Observer (Jeff Shima) text
TimeTime of survey HH:MM
ReefNumber dimensionless
TreatmentDoes not apply to this dataset NA
STEG_10to30STEG 10-30 - Stegastes nigricans between 10-30mm; unless otherwise noted Number observed
STEG_30to40STEG 30-40 - Stegastes nigricans from 30-40mm; unless otherwise noted Number observed
STEG_40plusSTEG 40+ - Stegastes nigricans; above 40mm unless otherwise noted Number observed
D_flav_10to15D flav 10-15 - Dascyllus flavicaudus from 10-15mm Number observed
D_flav_15to40D flav 15-40 - Dascyllus flavicaudus from 15-40mm Number observed
D_flav_40plusD flav 40+ - Dascyllus flavicaudus above 40mm Number observed
D_arua_10to15D arua 10-15 - Dascyllus aruanus from 10-15mm Number observed
D_arua_15plusD arua 15+ - Dascyllus aruanus above 15mm Number observed
D_trimac_10to15D trimac 10-15 - Dascyllus trimaculatus from 10-15mm Number observed
D_trimac_15to40D trimac 15-40 - Dascyllus trimaculatus from 15-40mm Number observed
D_trimac_40plusD trimac 40+ - Dascyllus trimaculatus above 40mm Number observed
Chromis_vir_10to15Chromis vir 10-15 - Chromis viridis between 10-15mm Number observed
Chroimis_vir_15plusChroimis vir 15+ - Chromis viridis above 15mm Number observed
Pom_pavo_10to15Pom pavo 10-15 - Pomacentrus pavo (saphire damsel; "yellow tail chromis"); between 10-15mm Number observed
Pom_pavo_15plusPom pavo 15+ - Pomacentrus pavo (saphire damsel; "yellow tail chromis"); above 15mm Number observed
Chrysiptera_brow_10to15Chrysiptera brow 10-15 - Chrysiptera brownriggii (surge damsel; "yellow-blue damsel"); between 10-15mm Number observed
Chrysiptera_brow_15plusChrysiptera brow 15+ - Chrysiptera brownriggii (surge damsel; "yellow-blue damsel"); above 15mm Number observed
Chromis_margar_10to15Chromis margar 10-15 - Chromis margaritifer (white tail damsel; bicolor chromis); between 10-15mm Number observed
Chromis_margar_15plusChromis margar 15+ - Chromis margaritifer (white tail damsel; bicolor chromis); above 15mm Number observed
OtherOther - rare species Number observed
cleaner_wrassecleaner wrasse - either species of cleaner wrasse Number observed
Yellow_AngleYellow Angle Number observed
Piano_fang_blennyPiano fang blenny - Plagiotremus tapeinosoma Number observed
NotesNotes text
vermetidsVermetids Number observed

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Dataset-specific Instrument Name
Transect Tape
Generic Instrument Name
Measuring Tape
Dataset-specific Description
Materials: transect tape and slates
Generic Instrument Description
A tape measure or measuring tape is a flexible ruler. It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear-measurement markings. It is a common tool for measuring distance or length.

Dataset-specific Instrument Name
Generic Instrument Name
Underwater Writing Slate
Dataset-specific Description
Materials: transect tape and slates
Generic Instrument Description
Underwater writing slates and pencils are used to transport pre-dive plans underwater, to record facts whilst underwater and to aid communication with other divers.

Dataset-specific Instrument Name
Mask and snorkel
Generic Instrument Name
Diving Mask and Snorkel
Generic Instrument Description
A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including, scuba divers, free-divers, and snorkelers to see clearly underwater. Snorkel: A breathing apparatus for swimmers and surface divers that allows swimming or continuous use of a face mask without lifting the head to breathe, consisting of a tube that curves out of the mouth and extends above the surface of the water.

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Osenberg et al Moorea
Start Date
End Date

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Project Information

Cryptic density dependence: the effects of spatial, ontogenetic, and individual variation in reef fish (CDD_in_Reef_Fish)

Coverage: Moorea, French Polynesia (-17.48, -149.82)

Description from NSF award abstract:
Ecologists have long been interested in the factors that drive spatial and temporal variability in population density and structure. In marine reef systems, attention has focused on the role of settlement-the transition of pelagic larvae to a benthic stage-and on density-dependent processes affecting recently settled juveniles. Recent data suggest that co-variance in settlement and subsequent density-dependent survival can obscure the patterns of density dependence at larger scales, a phenomenon called cryptic density dependence. This research will explore the mechanisms that underlie the spatial covariance of settlement and site quality - a process that has received little attention in the standard paradigm. These mechanistic studies of cryptic density dependence will facilitate the development of new frameworks for fish population dynamics that incorporate larval ecology, habitat quality, density dependence, life history, and the patterns and implications of spatial covariance among these factors. More generally, the work provides a specific empirical context, and a general theoretical treatment, of cryptic heterogeneity (hidden individual variation in demographic rates).

Note: Drs. Craig W. Osenberg and Ben Bolker were at the University of Florida at the time the NSF award was granted. Dr. Osenberg moved to the University of Georgia during the summer of 2014 (current contact information). Dr. Bolker moved to McMaster University in 2010 (current contact information).

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Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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