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¹ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas

Cephalopod paralarval species richness, abundance, and size structure were surveyed weekly during an anomalous warm period (2014–2017) in Cabo Pulmo National Park, Gulf of California, Mexico. Paralarval taxa from 6 families (Cranchiidae, Enoploteuthidae, Ommastrephidae, Onychoteuthidae, Argonautidae, and Octopodidae) were identified. Most taxa were of tropical biogeographic affinity and oceanic habitat associated with a regional heat wave during 2014, an equatorial El Niño 2015–2016 event, and with the narrow continental shelf of the sampling location. Highest paralarval richness occurred during springs associated with the northward movement of Tropical Surface Water, while the lowest was recorded during autumn with the southward flow of the Gulf of California water mass. Although 89% of the paralarvae were collected at or close to their species hatching size, none of the paralarval taxa showed a consistent seasonal spawning period. The Canonical Correspondence Analysis showed three taxonomic assemblages: Argonauta and Helicocranchia-Onychoteuthis groups correlated with northward currents and high zooplankton biovolumes, and SD complex-Abraliopsis group with southward currents and intermediate zooplankton biovolumes. Our Helicocranchia pfefferi paralarvae is the first record in the Gulf of California. At least 11 cephalopod taxa reproduce in Cabo Pulmo National Park. This area represents a suitable spawning habitat for cephalopods of socio-economic value.

Palabras clave: Spawning period; hatching size; heat wave; El Niño; Cabo Pulmo National Park

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