|McKeon, C. S.||Smithsonian Marine Station (SMS)||Principal Investigator, Contact|
|Bolker, Ben||McMaster University||Co-Principal Investigator|
|McIlroy, Shelby E.||University of Hong Kong||Co-Principal Investigator|
|Stier, Adrian||University of Washington (UW)||Co-Principal Investigator|
|Biddle, Mathew||Woods Hole Oceanographic Institution (WHOI BCO-DMO)||BCO-DMO Data Manager|
This dataset is part 1 of a 2 part manipulative experiment to investigate the existence of cooperative synergy in defensive behaviors of ‘guard’ crustaceans at Gump Research Station, Moorea, French Polynesia. Please reference the Related Datasets for additional datasets.
We used feeding trials to quantify the efficacy of defense for four exosymbiont treatment groups: Trapezia + Alpheus, Trapezia, Alpheus, and No Exosymbionts. Twenty replicates in total were conducted for each exosymbiont treatment in a temporally blocked design with two replicates in each of ten temporal blocks. Trials were conducted in a large octagonal flow-through seawater tank approximately 0.5 m deep and 2 m across. The tank was divided into eight equal sections using plastic screening. Each section was provisioned with a seastar refugium constructed from concrete blocks. We placed Pocillopora colonies into the tank from the field during mid- to late afternoon. To minimize variation driven by search time, a single Culcita was placed directly on top of the coral colony. The following morning, we measured the coral size (length, width, height) and the feeding scars left by the Culcita (length, width, depth). We calculated volume consumed as an ellipsoid (4= 3pabc , where a is half the length, b is half the width, and c is half the depth).
We calculated volume consumed as an ellipsoid (4/ 3*pi*abc, where a is half the length, b is half the width, and c is half the depth).
|Date||Date of experiment (in yyyymmdd format)||unitless|
|Treatment||Treatment applied (1: No exosymbionts; 2: Alpheus (Pair of Alpheus lottini only); 3: Trapezia (Pair of Trapezia serenei only ); 4: Alpheus + Trapezia (Pair of Alpheus lottini and pair of Trapezia serenei))||unitless|
|Location||Location of culcita (side; top)||unitless|
|CircHorz||Horizontal circumference of i||centimeters (cm)|
|CircVert||Vertical circumference of Pocillopora cf. meandrina||centimeters (cm)|
|Length||Length of experimental coral colonies||centimeters (cm)|
|Width||Width of experimental coral colonies||centimeters (cm)|
|Height||Height of experimental coral colonies||centimeters (cm)|
|Volume||The volumes of corals used in the deterrence trials||cubic centimeters (cm^3)|
|Surface_Area_Rectangle||Surface area of experimental coral colonies||square centimeters (cm^2)|
|Culcita_Diameter||Diameter of Culcita novaeguineae used in experiment||centimeters (cm)|
|Predation_Binary||Presence or absence of predation event||unitless|
|PredWidth||Width of feeding scar||centimeters (cm)|
|PredHeight||Height of feeding scar||centimeters (cm)|
|PredDepth||Depth of feeding scar||centimeters (cm)|
|PredCirc||Circumference of feeding scar||centimeters (cm)|
|Predvolumerec||Volume consumed calculated as: 4/3(pi)*PredWidth*PredHeight* PredDepth||cubic centimeters (cm^3)|
|Predation_Location||Location of feeding scars on experimental coral colony||unitless|
Osenberg et al Moorea
|Start Date|| |
|End Date|| |
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).