The Database of Island Invasive Species Eradications attempts to compile all historical and current invasive vertebrate eradication projects on islands. The vast majority of the dataset is focused on invasive mammals. Data gathered from each project includes island location and characteristics, details about the eradication including focal species, methods and outcome, plus links and or contact details for learning more about the project. Parameter descriptions are described here
Since 2014 we assessed all eradication attempts for data quality based on definitions in Table 1. We expect any data summary to be restricted to only good or satisfactory data quality. We retain events of poor quality in the online database in the hope others can help us further qualify or remove these events.
Eradication start and end date are reported for years only. We considered eradication end date to be the year that major eradication operations ceased. This typically coincided with the end of confirmation of eradication for hunting / trapping for ungulates and predators or the end of toxicant application (or other methods) for rodent projects. Note that confirmation of eradications can occur some years after the end of operations (particularly for rodents). Eradication status is based on definitions in Table 2. We consider failures to be operational failures, i.e. the project did not successfully remove the population. We consider reinvasion to be subsequent to a successful eradication. Note that reinvasions can be misdiagnosed as failures and vice versa. Note we also include trial eradications that were used to inform larger operations.
Island eradication type (Table 3) refers to whether the operation required treatment of the entire island, or only part of the island (restricted range) to remove the population from the island. Note we also delineate between incursion responses and whole island events, where incursions represent operations to remove a population prior to their establishment across the entire island.
Data on the primary and secondary method of the eradication are collected, including disease, hunting, trapping, toxicant, other, unknown, none (secondary method only). Where toxicant was used the baiting method was noted as either aerial broadcast, bait station, hand broadcast, unknown, other, bait piles, and toxicant compound identified.
References that cite part or all of these eradication events are provided, including a link if this is online.
Contact details and organization are provided where they have been made available. Note some contact details have been withheld at the request of practitioners. Should you not see any contact details please contact firstname.lastname@example.org and we are happy to share the knowledge we do have.Table 1. Data Quality Definitions
|Good||We can verify the attempt; we have a copy of the primary reference that details the effort|
|Satisfactory||Someone else has verified the attempt; we do not have a copy of the primary reference but it is either cited in a peer reviewed paper (typically a geographic or species based review) or in an online database that is accessible at time of checking, or it is a documented personal communication.|
|Poor||We cannot verify the attempt; a text eludes to an eradication but only partial information provided (we do not know one or more of year, animal type, status, or primary method). Data are potentially inaccurate or evidence is conflicting. We do not have a copy of the reference or it an undocumented personal communication|
|Unknown||Data quality has not been assessed yet|
|Successful||Operation successfully removed invasive population (i.e. this species is no longer present on island)|
|Successful (reinvaded)||Operation was successful, but invasive subsequently reinvaded island|
|Failed||Operation failed to remove invasive|
|To be confirmed||Eradication operations completed but outcome not yet known|
|In progress||Eradication currently in progress at time of reporting|
|Planned||Eradication being planned at time of reporting|
|Incomplete||Eradication stopped prior to completion|
|Trial or research only||Undertaken for trial or research purposes only with goal of gathering information, not of eradication|
|Unknown pre-status||Eradication undertaken but status of invasive unclear beforehand. Typically undertaken for precautionary measures for rodent eradications|
|Island Eradication Type||Definition|
|Whole island||Entire island was treated to achieve eradication|
|Restricted range||Only part of the island treated to achieve eradication (excluding fenced eradications).|
|Fenced area||Eradication took place inside a fenced area.|
|Unknown||Unknown if whole island was treated.|
|Incursion response||Invasion in progress was detected and successfully prevented. Note: if the invasion is successful this requires a whole island eradication.|
|Island Conservation||University of California, Santa Cruz (UCSC)||Coastal Conservation Action Lab, UCSC|
|Center for Integrated Spatial Research (CISR), UCSC||The University of Auckland, New Zealand||Landcare Research (Manaaki Whenua), New Zealand|
|International Union for Conservation of Nature (IUCN)||Species Survival Commission (SSC), IUCN||Invasive Species Specialist Group, IUCN SSC|