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Deep-sea seven-arm octopus hijacks jellyfish in shallow waters

Pelagic octopods have secondarily left the seafloor and evolved a holopelagic existence. One of the most striking adaptations among a suite of related pelagic octopod families (superfamily Argonautoidea) is their associations with gelatinous zooplankton (jellyfishes and salps). Here, we report a unique interaction between a male octopod (Haliphron atlanticus) and a jellyfish (Pelagia noctiluca) at the sea surfa...

Hijacking, hitchhiking and burglary behaviors of pelagic octopuses

Pelagic octopuses are a highly specialized group of octopuses that have secondarily left the seafloor and evolved a holopelagic existence. One of the most striking adaptations amongst a suite of related pelagic octopus families (superfamily Argonautoidea) is their associations with gelatinous zooplankton (jellyfishes and salps). Here, we report footage of a never-before-seen interaction in nature (here coined a...

Forebrain neuropeptide regulation of pair association and behavior in cooperati...

Animals establish privileged relationships with specific partners, which are treated differently from other conspecifics, and contribute to behavioral variation. However, there is limited information on the underlying physiological mechanisms involved in the establishment of these privileged ties and their relationship to individual cooperation levels. The Indo-Pacific bluestreak cleaner wrasse Labroides dimidi...

Brain levels of nonapeptides in four labrid fish species with different levels ...

There is strong evidence that brain nonapeptides are implicated as modulators of a wide array of social and reproductive behaviors in fishes. However, the question remains, as to whether there is a link between the distribution of active nonapeptides across brain regions and fishes specific behavioral phenotypes. To explore this link we compared the nonapeptides' profile across the brains of fishes representing...

Spray drying of Eugenia dysenterica extract: effects of in-process parameters o...

Estimating the size of "Uca tanger" (Crustacea: Ocypodidae) without massive cra...

Uca tangeri (Eydoux, 1835) is the only species of fiddler crab that occurs in Portugal, where it mainly inhab-its salt marshes in the south and southwest coasts. Individuals spend most of their time on and around their galleries, bur-rowing structures which they typically create and maintain in muddy substrate. Capturing fiddler crabs in nature is extreme-ly difficult and can be destructive for their habitat. O...

The use of artificial benthic collectors for assessment of spatial patterns of ...

Artificial benthic collectors have been widely used for the assessment of settlement rates of decapod crustaceans. However, to date no consistent works have addressed spatial patterns of settlement in different estuarine habitats, and no specific studies targeted the interaction of artificial surfaces with the surrounding natural substrate. It may be expected that the artificial surface may produce a different ...

Tide and wind control of megalopal supply to estuarine crab populations on the ...

Physical processes that force transport of planktonic larvae of invertebrates are responsible for some of the spatial and temporal variability in recruitment. We investigated the influence of tide- and winddriven circulation on intra-year variability of megalopal supply to populations of the crab Carcinus maenas in 2 estuaries on the Portuguese west coast. Daily data on physical variables and on supply and sett...

Longitudinal distribution and lateral pattern of megalopal settlement and juven...

Settlement is a critical process in the life history of crabs, and thus affecting the abundance, distribution and structure of estuarine communities. The spatial pattern of settlement of megalopae of the shore crab Carcinus maenas along a longitudinal estuarine gradient (Mira River Estuary, Portugal) was examined, as well as its effects on the juvenile population. To measure megalopal settlement, four replicate...

Decapod crustaceans collected by the "Expedition Azores 1989"

As populações litorais de crustáceos decápodes das ilhas do Faial e Pico foram amostradas qualitativamente de 9 a 24 de Julho de 1989. Os métodos de amostragem consistiram, principalmente, em colheitas manuais em substrato rochoso, em praias e em mergulho com escafandro autónomo. Redes de arrasto e sugadoras foram também utilizadas sobre fundos de areia. Foram colhidas ou observadas um total de 41 espécies (16 ...