|Carr, Mark||University of California-Santa Cruz (UC Santa Cruz)||Principal Investigator, Contact|
|Tinker, Tim||University of California-Santa Cruz (UC Santa Cruz)||Co-Principal Investigator|
|Ake, Hannah||Woods Hole Oceanographic Institution (WHOI BCO-DMO)||BCO-DMO Data Manager|
This metadata record documents the kelp forest community survey component of the investigators' project. Data generated by these surveys consists of the following recorded on "transects" (described in Methodology section below): (i) the number and size of individuals greater than 2.5 cm diameter of all sea star species as well as notation of evidence of disease, (ii) the number and size of individuals greater than 2.5 cm diameter of both sea urchin species (Strongylocentrotus purpuratus and Mesocentrotus franciscanus) as well as notation of evidence of disease, (iii) density (individuals per 60m2) of all conspicuous invertebrates and macroalgae.
Sampling consists of visual surveys of the density (number per 60m2) of all non-cryptic sessile and mobile solitary invertebrates and macroalgae by SCUBA divers. In addition, sizes of select species (sea urchins, abalone, giant kelp) are recorded. Surveys are conducted at sites distributed throughout the study region (Carmel Bay and southern Monterey Bay). Each sample site is divided into three "zones" (by depth - 20m, 12.5m, 5m - or from offshore to inshore at sites with little depth variation) to assure that samples are distributed across the face of a reef from inshore to offshore. Where possible, taxa (or taxonomic categories) are enumerated on six transects stratified across the three depth strata (two per stratum) per site (typically a 100m length of coastline, extending from onshore to the 20m isobath). Each "transect" is a 2m x 30m swath haphazardly located within one of the three depth strata. Transects within a stratum are separated end-to-end by approximately 5m. Sampling of each transect is conducted by three divers simultaneously. One diver records the number of individual invertebrates and macroalgae within each of three 10m-long segments of the 60m2 swath. A second diver records the organism and substratum type beneath each of 30 points uniformly distributed along the 30m length of the transect (i.e. 1.0m increments) and the vertical relief (highest to lowest height of the reef surface) within a 0.5m long by 1m wide area centered on each uniform point. A third diver records the number and size of sea urchins and abalone within each of the 10m long segments of the 60m2 swath. High densities of any species are enumerated by recording the distance along the transect at which 30 individuals are recorded within each 10m segment of the 30m-long transect. Surveys are designed to measure year-to-year site-wide variability in species density or percent cover, from which community structure and interannual dynamics are derived.
Data recorded on underwater paper by divers are entered into Excel spreadsheets by hand and double checked for accuracy. Each dataset is checked for valid entries and completeness.
BCO-DMO Data Processing Notes:
-Month and day combined with year to create date column.
-All column names reformatted to comply with BCO-DMO standards
-nd was entered into all blank cells
-Commas were removed from the descriptions in notes column
-lat/lon columns created based on information found in the site keys submitted with the data
|year||The year that the survey was done. This date is expressed in YYYY format. Dates reflect measurements taken in Local Time.||unitless|
|date||The date that the survey was done. This date is expressed in YYYYmmdd format. Dates reflect measurements taken in Local Time.||unitless|
|site||The unique site code where the survey was performed. This site code refers to a specific GPS location defined by a bounding box and is likely associated with a placename (i.e there may be multiple sitecodes at the 'Jalama Beach' placename).||unitless|
|lat||Latitude; north is positive.||decimal degrees|
|lon||Longitude; east is positive.||decimal degrees|
|side||A division of the site into two or three areas; referred to as sides. Sides may be East (E); West (W); South (S); North (N); CEN (central)||unitless|
|zone||A division of the side into 2 or 4 categories representing onshore-offshore stratification or targeted bottom depths for transects. Zones may be INNER; INMID; OUTMID; OUTER.||unitless|
|transect||A number representing one of the parallel transects through the sitearea along which are located the sampling segments.||unitless|
|classcode||The unique taxonomic or functional classification code that is being counted as defined in the PISCO classification table. This refers to a code that defines the Genus and Species. See "Species Key" dataset for definitions.||unitless|
|count||The count of the species or class indicated by the class code. The count is the number of points which fall on the identified classcode at 1m intervals along the transect tape.||count|
|size||The size of an individual or group of individuals (of the same length). When referring to giant kelp (Macrocystis) size indicates the number of stipes per plant at 1m above bottom.||centimeters (cm)|
|depth||Average depth of the transect estimated by the diver. Each level is measured.||meters (m)|
|notes||Notes and field observations.||unitless|
Long Marine Lab UCSC
|Start Date|| |
|End Date|| |
Sites of Kelp Forest Resilience project. Nearshore waters of southern Monterey Bay and Carmel Bay, California. 36 N, 121 W.