Miguel Molina-Borja

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This study deals with the variations of plasma melatonin content and ofin vitro pineal melatonin secretion, in one year-old male sea bream. Plasma melatonin levels varied from almost undetectable levels during the day to 150–200 pg ml−1 during the night, in animals maintained under a light/dark (12L/12D) cycle. The duration of the nocturnal surge(More)
The pineal organ of fish, through its 24h rhythmic release of melatonin, acts as a transducer of the photoperiod, influencing different physiological functions (e.g., reproduction, growth). The target sites for melatonin are poorly known in fish, especially marine species. A radioligand study was undertaken using the gilthead sea bream (Sparus aurata)(More)
The observed transition frequencies of behaviour patterns were obtained for isolated lizards (Gallotia galloti), as well as those expected if the patterns were independent. The transitions differing significantly from random were calculated when: (1) the animals had an electrode in their lateral hypothalamic area (I); (2) they were electrically stimulated(More)
Because sexual selection pressures are high in sexually dimorphic organisms, morphological, physiological and performance traits are often studied in a sexual selection context. The proximate mechanisms underlying evolutionary change in these traits, however, remain largely unstudied. Here, we examined the role of steroids in shaping morphology and(More)
There have been relatively few attempts to quantitatively describe behaviours in scincid lizards. Chalcides viridanus is a small body-sized skink endemic of Tenerife (Canary Islands). We describe and quantify 18 behaviour patterns (both social and agonistic) of this species, some of which have not been described before for other scincids. Video recordings(More)
Many vertebrate species show display behaviors when predators are in their vicinity. Some of these displays may inform the predator of the improbability of capturing the prey (i.e., pursuit-deterrent displays) and are potentially advantageous to both predator and prey. Here we present data on a tail display performed by Gonatodes albogularis, a diurnal(More)
The study assessed the behavior of Gallotia bravoana (La Gomera, Canary Islands, one of the world's most threatened reptiles) to facilitate management decisions and improve welfare during initial stages of a species' recovery plan. The study analyzed--and remote-controlled video cameras filmed-the behavior of lizards housed in 3 outdoor enclosures, from May(More)
The temporal and spatial distribution of various aggressive and courting behaviors of the lacertid lizardGallotia galloti was studied in Tenerife (the Canary Islands) for several days from April to June, by direct observations with binoculars from a hide situated near the study area. Aggressive behaviors were exhibited by the lizards throughout the whole(More)
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