delaware-gov/horseshoe-crab-spawning-survey-cqsj-dfgg

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Horseshoe Crab Spawning Survey

Horseshoe Crab Spawning Survey

Survey data from 1999-2018 which denotes peak spawning occurrences by day and lunar period, proportion of spawning in May (coinciding with shorebird stopovers), average water temperature, index values for female and male crabs per square meter by beach and baywide, the annual sex ratio, and index of abundance per beach.

Columns

NameSocrata field nameColumn name in sgr mountData typeDescription
Baywide Male SDbaywide_male_sdbaywide_male_sdNumberStandard Deviation - Statistical variation of Index of Spawning Activity (ISA) values for males
YearyearyearNumberYear of survey
NJ % Female Spawning in Maynj_female_spawning_in_maynj_female_spawning_in_mayNumberProportion of females recorded during May of a given survey year on New Jersey Beaches
Avg. Daily Water Temp. in May (°C)avg_daily_water_temp_in_may_cavg_daily_water_temp_in_may_cNumberAverage of daily water temperatures recorded at the National Ocean Service station at Lewes, DE (Station Identification Number 8557380) during the month of May in °Celsius
Baywide Spawning Activity Lunar Period 1baywide_spawning_activity_lunar_period_1baywide_spawning_activity_lunar_period_1NumberThe mean of the total number of female crabs per total area available for the spawning survey on all surveyed beaches. The first moon phase (new or full) in May around which surveying begins - 2 days before, day of, 2 days after.
Baywide Spawning ActivityLunar Period 2baywide_spawning_activitylunar_period_2baywide_spawning_activitylunar_period_2NumberThe mean of the total number of female crabs per total area available for the spawning survey on all surveyed beaches. The second moon phase (new or full) in May around which surveying occurs - 2 days before, day of, 2 days after.
Baywide Spawning ActivityLunar Period 3baywide_spawning_activitylunar_period_3baywide_spawning_activitylunar_period_3NumberThe mean of the total number of female crabs per total area available for the spawning survey on all surveyed beaches. The first moon phase (new or full) in June around which surveying occurs - 2 days before, day of, 2 days after.
Baywide Spawning ActivityLunar Period 4baywide_spawning_activitylunar_period_4baywide_spawning_activitylunar_period_4NumberThe mean of the total number of female crabs per total area available for the spawning survey on all surveyed beaches. The second moon phase (new or full) in June around which surveying occurs - 2 days before, day of, 2 days after (typically the last period of surveying).
Total Beaches Surveyedtotal_beaches_surveyedtotal_beaches_surveyedNumberNumber of beaches on which the standardized form of the spawning survey was conducted baywide
Baywide Male Spawning Activitybaywide_male_spawning_activitybaywide_male_spawning_activityNumberThe mean of the total number of male crabs per total area available for the spawning survey on all surveyed beaches.
Baywide Male 90% CI Lower Limitbaywide_male_90_ci_lower_limitbaywide_male_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of male horseshoe crab spawning activity
Baywide Male 90% CI Upper Limitbaywide_male_90_ci_upper_limitbaywide_male_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of male horseshoe crab spawning activity
Number of Males per FemalenumbermalesperfemalenumbermalesperfemaleNumberThe number of males observed in a given spawning season per female observed during that same season.
Baywide Male CVbaywide_male_cvbaywide_male_cvNumberCoefficient of variation - Unitless description of the amount of variation relative to the mean Index of Spawning Activity (ISA), expressed as a percentage for males
Baywide Female Spawning Activitybaywide_female_spawning_activitybaywide_female_spawning_activityNumberIndex of female horseshoe crab spawning activity - mean number of female crabs per square meter per night for Delaware and New Jersey beaches
Baywide Female 90% CI Lower Limitbaywide_female_90_ci_lower_limitbaywide_female_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of female horseshoe crab spawning activity
Baywide Female 90% CI Upper Limitbaywide_female_90_ci_upper_limitbaywide_female_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of female horseshoe crab spawning activity
Baywide Female CVbaywide_female_cvbaywide_female_cvNumberCoefficient of variation - Unitless description of the amount of variation relative to the mean Index of Spawning Activity (ISA), expressed as a percentage for females
DE Male Spawning Activityde_male_spawning_activityde_male_spawning_activityNumberThe mean of the total number of male crabs per total area available for the spawning survey on all DE surveyed beaches
DE Male 90% CI Upper Limitde_male_90_ci_upper_limitde_male_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of female horseshoe crab spawning activity in Delaware
DE Female 90% CI Lower Limitde_female_90_ci_lower_limitde_female_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of female horseshoe crab spawning activity in Delaware
NJ Male Spawning Activitynj_male_spawning_activitynj_male_spawning_activityNumberThe mean of the total number of male crabs per total area available for the spawning survey on all NJ surveyed beaches
NJ Female 90% CI Lower Limitnj_female_90_ci_lower_limitnj_female_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of female horseshoe crab spawning activity in New Jersey
NJ Female 90% CI Upper Limitnj_female_90_ci_upper_limitnj_female_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of female horseshoe crab spawning activity in New Jersey
NJ Female Spawning Activitynj_female_spawning_activitynj_female_spawning_activityNumberThe mean of the total number of female crabs per total area available for the spawning survey on all NJ surveyed beaches
DE % Female Spawning in Mayde_female_spawning_in_mayde_female_spawning_in_mayNumberProportion of females recorded during May of a given survey year on Delaware beaches
DE Female Spawning Activityde_female_spawning_activityde_female_spawning_activityNumberThe mean of the total number of female crabs per total area available for the spawning survey on all DE surveyed beaches
NJ Beaches Surveyednj_beaches_surveyednj_beaches_surveyedNumberNumber of beaches on which the standardized form of the spawning survey was conducted in New Jersey
DE Male 90% CI Lower Limitde_male_90_ci_lower_limitde_male_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of male horseshoe crab spawning activity in Delaware
NJ Male 90% CI Lower Limitnj_male_90_ci_lower_limitnj_male_90_ci_lower_limitNumber90% Confidence Interval - Lower limit of values where there exists a 90% probability of male horseshoe crab spawning activity in New Jersey
NJ Male 90% CI Upper Limitnj_male_90_ci_upper_limitnj_male_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of male horseshoe crab spawning activity in New Jersey
DE Female 90% CI Upper Limitde_female_90_ci_upper_limitde_female_90_ci_upper_limitNumber90% Confidence Interval - Upper limit of values where there exists a 90% probability of female horseshoe crab spawning activity in Delaware
DE Beaches Surveyedde_beaches_surveyedde_beaches_surveyedNumberNumber of beaches on which the standardized form of the spawning survey was conducted in Delaware
Baywide Female SDbaywide_female_sdbaywide_female_sdNumberStandard Deviation - Statistical variation of Index of Spawning Activity (ISA) values for females

Upstream Metadata