{"refrec":{"BRefID":348249,"RR":"<b>Moreno-Dávila, B.; Gómez-Gutiérrez, J.; Alcoverro, T.; Ramirez-Luna, S.; Sánchez, C.; Balart, E.F.; Huato-Soberanis, L.</b> (2021). Mass mortality of pen shell <i>Atrina maura</i> (Bivalvia: Pinnidae) due to abrupt population increase of tunicate (<i>Distaplia</i> sp.) in a subtropical bay, Mexico. <i>Est., Coast. and Shelf Sci. 260</i>: 107493. <a href=\"https://dx.doi.org/10.1016/j.ecss.2021.107493\" target=\"_blank\">https://dx.doi.org/10.1016/j.ecss.2021.107493</a>","BEntID":344943,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Est., Coast. and Shelf Sci. 260</i>: 107493. <a href=\"https://dx.doi.org/10.1016/j.ecss.2021.107493\" target=\"_blank\">https://dx.doi.org/10.1016/j.ecss.2021.107493</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Moreno-Dávila, B.; Gómez-Gutiérrez, J.; Alcoverro, T.; Ramirez-Luna, S.; Sánchez, C.; Balart, E.F.; Huato-Soberanis, L.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Moreno-Dávila, B. <i>et al.</i>","Englishabstract":"The present study analyses the coverage of epibiont <i>Distaplia</i> cf. <i>stylifera</i> (Ascidiacea: Holozoidae) and five environmental variables (Sal, SST, DO, sea surface Chl-a concentration and pH) as potential factors to explain a mass mortality event in a restored population of the pen shell <i>Atrina maura</i> (Bivalvia: Pinnidae) in a subtropical bay of the Gulf of California, Mexico. Annual autumn surveys in 2015, 2016 and 2017 (Nov–Dec) and an additional summer survey in 2016 (Jun) showed that the tunicate was first observed at low densities in a few sampling sites during 2015 and rapidly expanded along the pen shell banks in 2016. Tunicate manual removal was carried out in two small areas during Sep-Nov 2016 and Jan–Mar 2017. The mass mortalities of <i>A. maura</i> detected in 2016 and 2017 resulted in a high economic loss for regional fishers. A Generalised additive model (GAM) indicated that the substrate provided by <i>A. maura</i> was the only significant factor associated to the rapid expansion (measured as the proportion of coverage) of <i>D.</i> cf. <i>stylifera</i>. Paradoxically, the recovery success in the <i>A. maura</i> population increased substrate availability for the tunicate epibiont, facilitating an abrupt and fast colonisation process on the pen shell banks, resulting in <i>A. maura</i> mass mortality events in 2016 and 2017. Our model predicts that <i>D.</i> cf. <i>stylifera</i> coverage effects begin to occur when the density of <i>A. maura</i> is > 47 inds./250 m<sup>2</sup>. A second GAM demonstrated that the main driver of <i>A. maura</i> mortality was ascidian coverage, and salinity, SST and DO were secondary driver factors. We concluded that the density of dead <i>A. maura</i> increases when the coverage of <i>D.</i> cf. <i>stylifera</i> is >8%, salinity >37.3 PSU, SST <26.9 °C and DO > 5.06 mg O<sub>2</sub>/L. Early harvesting of <i>A. maura</i> to decrease substrate availability at the first signs of <i>D.</i> cf. <i>stylifera</i> population growth can avoid significant economic losses in the future.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Mass mortality of pen shell <i>Atrina maura</i> (Bivalvia: Pinnidae) due to abrupt population increase of tunicate (<i>Distaplia</i> sp.) in a subtropical bay, Mexico","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:32:40.510257","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ascidian; Population growth; Distaplia stylifera; Epibionts; Bivalve; Gulf of California","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-12-20","DateCreate":"2021-12-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000702565600005","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.ecss.2021.107493"},"refs":null,"anarec":{"AnaID":348249,"PubliDate":2021,"Pagination":"107493","XtraPublOfAnaID":null,"ISBN":null,"Volume":"260","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44109,"SerRR":"Estuarine, Coastal and Shelf Science. 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