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RESEARCH ARTICLE

Triggering larval settlement behaviour and metamorphosis of the burrowing ghost shrimp, Lepidophthalmus siriboia (Callianassidae): do cues matter?

Kácia Letícia de Noronha Campos A , Fernando Araújo Abrunhosa A and Darlan de Jesus de Brito Simith A B C
+ Author Affiliations
- Author Affiliations

A Laboratório de Carcinologia, Instituto de Estudos Costeiros (IECOS), Universidade Federal do Pará (UFPa), Campus Universitário de Bragança, Alameda Leandro Ribeiro s/n, Aldeia, 68600-000, Bragança, Pará, Brazil.

B Laboratório de Ecologia de Manguezal (LAMA), Instituto de Estudos Costeiros (IECOS), Universidade Federal do Pará (UFPa), Campus Universitário de Bragança, Alameda Leandro Ribeiro s/n, Aldeia, 68600-000, Bragança, Pará, Brazil.

C Corresponding author. Email: simithdjb@hotmail.com

Marine and Freshwater Research 67(3) 291-300 https://doi.org/10.1071/MF14326
Submitted: 14 October 2014  Accepted: 2 February 2015   Published: 22 June 2015

Abstract

Larval settlement and metamorphosis of many estuarine decapod crustaceans are triggered by environmental cues and chemical substances produced by the conspecific population. Here, we examined the influence of substrata and conspecific cues on the stimulation of the megalopal stage of the burrowing ghost shrimp (Lepidophthalmus siriboia) in the following five treatments: (1) adult-conditioned seawater (ACSW), (2) filtered seawater (FSW) + sand, (3) FSW + muddy sand (MS), (4) ACSW + MS and (5) FSW without cues (control). All megalopae settled and exhibited burrowing behaviour in the treatments containing substratum. The percentage of metamorphosis to juvenile was high (≥96%) in all treatments. Megalopae developed significantly faster in the control (5.7 days, ±0.9 s.d.) than in the remaining treatments (6.8–7.3 days). These findings demonstrated that settlement of L. siriboia megalopae is strongly induced by substrata, whereas their metamorphosis occurs irrespective of the presence or type of exogenous cues associated with estuarine habitat and conspecific adults. This suggests certain flexibility concerning the ontogenetic stage at which recruitment to the benthos occurs. The independence of metamorphic inducers should be important for colonisation of new estuarine areas as well as for recovery and maintenance of viable populations in disturbed habitats where callianassid ghost shrimps are heavily exploited.

Additional keywords: Axiidea, burrowing activity, cryptic behaviour, juvenile, megalopa, recruitment.


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