Survey to quantify habitat availability for juvenile T. hardwicke in Moorea, French Polynesia from 2005-2007 (CDD_in_Reef_Fish project)

Website: https://www.bco-dmo.org/dataset/726732
Data Type: Other Field Results
Version: 1
Version Date: 2017-10-05

Project
» Cryptic density dependence: the effects of spatial, ontogenetic, and individual variation in reef fish (CDD_in_Reef_Fish)
ContributorsAffiliationRole
Geange, ShaneDepartment of Conservation - Wellington, New ZealandPrincipal Investigator, Contact
Biddle, MathewWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
This dataset is from a study examining the influence of structural refuge, competition and their interaction on the early post-settlement survival of transplanted Thalassoma hardwicke (the sixbar wrasse).


Coverage

Spatial Extent: Lat:-17.5 Lon:-149.8333333
Temporal Extent: 2005 - 2007

Dataset Description

This dataset is from a study examining the influence of structural refuge, competition and their interaction on the early post-settlement survival of transplanted Thalassoma hardwicke (the sixbar wrasse).

This dataset specially refers to a survey used to quantify habitat association for juvenile T. hardwicke. Please see Related Datasets below for additional data associated with this project.

Related Datasets:

 


Methods & Sampling

Three transects within Moorea’s northern lagoon were established. Each transect was approximately 800 m in length, and ran from shore to the barrier reef crest. Along each transect, five approximately equally spaced sites were identified (90 (SE = 3), 180 (SE = 7), 289 (SE = 7), 409 (SE = 7) and 508 (SE = 11) m from the reef crest). Within each site, 16 patch reefs (hereafter reefs) of similar size (n = 240 reefs: average surface area = 7.98 m2, SE = 0.24; average height = 0.83 m, SE = 0.01) were haphazardly selected. For each reef, and a one-meter halo surrounding the reef, percent cover of 16 substrate categories was visually estimated: Porites massive; Porites rus; Montipora spp.; Pocillopora spp.; Acropora spp.; other live coral; Turbinaria spp.; Dictyota spp.; Halimeda spp.; turf (a mixed filamentous red algal assemblage consisting predominately of Polysiphonia spp.); sponge; bare; other; sand; coral rubble; and pavement). For a subset of 45 reefs, the accuracy of visual estimates of percent cover against Fixed Point Contact (FPC) estimates of percent cover (a commonly accepted standard; Floyd & Anderson 1987) was evaluated. Visual estimates of percent cover were 84.8% accurate relative to FPC estimates and include better estimates of rare habitat than FPC (Meese & Tomich 1992). Habitat surveys were conducted between 7 March and 29 April 2005. On each reef and the surrounding one-meter halo, the identity of all juvenile labroids was recorded and their Standard Length (SL; to the nearest mm) visually estimated. The substrate directly below each individual at the time it was first observed was also recorded. Juveniles were defined as individuals less than 25mm SL. The accuracy of visual estimates of SL made in the field were evaluated by capturing a subset of fish (n = 298 from 8 different species) and comparing visual estimates of SL for these individuals to SL measured in the lab with callipers. Based on mean absolute error (MAE), visual estimation of SL was 94.7% accurate. Fish surveys were conducted between 0800 and 1600 hours (peak activity time for diurnal benthic fishes: Galzin 1987) from 27 May to 6 June 2005.


Data Processing Description

This is raw data.

BCO-DMO Processing:

  • added conventional header with dataset name, PI name, version date
  • modified parameter names to conform with BCO-DMO naming conventions

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Data Files

File
Geange_2010_LargerHeterospecifics_Habitatavailability.csv
(Comma Separated Values (.csv), 40.58 KB)
MD5:8df667c55f86906562d9ae251afd00cf
Primary data file for dataset ID 726732

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Related Publications

Geange, S. (2010). Effects of larger heterospecifics and structural refuge on the survival of a coral reef fish, Thalassoma hardwicke. Marine Ecology Progress Series, 407, 197–207. doi:10.3354/meps08569
General

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Related Datasets

IsRelatedTo
Geange, S. (2021) Field assay experiment data to determine if the presence of larger individuals of T. hardwicke adversely affects the survival of focal individuals in Moorea, French Polynesia from 2005-2007 (CDD_in_Reef_Fish project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2017-10-05 doi:10.26008/1912/bco-dmo.726693.1 [view at BCO-DMO]
Geange, S. (2021) Survey to quantify habitat association for juvenile T. hardwicke in Moorea, French Polynesia from 2005-2007 (CDD_in_Reef_Fish project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2017-10-05 doi:10.26008/1912/bco-dmo.726717.1 [view at BCO-DMO]
Geange, S. (2021) The influence of structural refuge, competition and their interaction on the early post-settlement survival of transplanted Thalassoma hardwicke (the sixbar wrasse) in Moorea, French Polynesia from 2005-2007 (CDD_in_Reef_Fish project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2017-10-05 doi:10.26008/1912/bco-dmo.726353.1 [view at BCO-DMO]

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Parameters

ParameterDescriptionUnits
siteunique identifier for each reef in survey unitless
habitathabitat type unitless
coverproportional habitat cover unitless

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Deployments

Osenberg_et_al_Moorea

Website
Platform
Osenberg et al Moorea
Start Date
2003-05-19
End Date
2015-07-12


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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

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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