Identification of the copepodite developmental stages of twenty-six North Atlantic copepods. Occasional Publication of the Marine Biological Association 21.

In zooplankton copepod studies there is often the requirement to be able to identify the six copepodite developmental stages of different species, or to know their body dimensions. However, this information is not available for many species, or is dispersed through the literature. This guide gathers together both original and previously published information on morphology and measurements for the stages of twenty-six common North Atlantic copepod species and tabulates them in a standard format. For each species additional notes useful in their identification are also given.

Identification of the copepodite developmental stages of twenty-six North Atlantic copepods. Occasional Publication of the Marine Biological Association No. 21 (revised edition)

This identification guide to the copepodite developmental stages of twenty-six North Atlantic copepods has been revised and extended, to include new information, to update the taxonomy and to give additional details on how to determine sex in the later copepodite stages of gymnoplean copepods.

Lipid productivity and cell wall ultrastructure of six strains of Nannochloropsis: Implications for biofuel production and downstream processing

Microalgae are generating considerable interest for third generation biodiesel production. However, appropriate strain selection is proving challenging due to the significant variation in cellular physiology, metabolic potential and genetics observed even amongst strains deemed morphologically similar. Six strains of Nannochloropsis from the CCAP culture collection were assessed for their lipid productivity and cellular structure, as proxies for oil production and harvesting ease, to assess their suitability as biodiesel production platforms. Differences in growth rate and lipid accumulation across the strains were observed. Nannochloropsis oculata strain 849/7 showed significantly reduced doubling time compared to Nannochloropsis salina strain 849/3, whilst Nannochloropsis oceanica 849/10 produced the highest lipid content. In addition the six strains could be differentiated into 3 distinct classes based on their cell wall thickness, which varied across the strains from 63 to 119 nm and which is independent of both species and geographical isolation location. The importance of these variations in ultrastructure and physiology for biodiesel production is discussed.

Notas florísticas sobre Andalucía Oriental: Sierra Quintana (Jaén)

Se incluyen en este trabajo 40 taxones recolectados en la Sierra de Quintana (provincia de Jaén); la mayor parte de ellos constituyen novedades para la flora de esta provincia. Algunos se citan por primera vez para Andalucía oriental: Illecebrum verticillatum L., Cicendia filiformis (L.) Delarbre, Exaculum pusillum (Lam.) Carnel in Parl., Gratiola linifolia Vahl., Laurentia gasparrini (Tineo) Strobl., etc.

Osteocondritis de sesamoideos: Revisión

La osteocondritis de los sesamoideos es una enfermedad infrecuente, que se puede dar en cualquiera de los dos sesamoideos, siendo una patología incapacitante. A pesar de que los sesamoideos juegan un papel fundamental en la mecánica del antepié, algunos trastornos que se dan en ellos a menudo se pasan por alto o son mal diagnosticados. Se revisa y analizan las características clínicas de la enfermedad, su tratamiento y las claves diagnósticas que nos permiten establecer un correcto diagnóstico diferencial con otros procesos patológicos que afectan a los sesamoideos.

Contribution of the UV component of natural sunlight to photoinhibition of photosynthesis in six species of subtidal brown and red seaweeds.

Field-collected specimens of three species of Laminaria and three species of subtidal red algae (Delesseria sanguinea, Plocamium cartilagineum and Phyllophora pseudoceranoides) were exposed to natural summer sunlight on Helgoland (southern North Sea) for up to 4 h at 15 °C. Dark-adapted variable fluorescence (Fv : Fm) was measured immediately after these treatments, and following 6, 24 and 48 h of recovery in moderate irradiances of white light. The response of plants to the full spectrum of natural sunlight was compared with that to PAR alone, UV-A + visible, UV-A + UV-B, or UV-A alone. The Fv : Fm values of all species were reduced to minimal values after 4 h in all of these treatments, but those of the more resistant species (Laminaria spp. and P. pseudoceranoides) were higher after shorter exposures to UV radiation alone than to PAR with or without UV. The recovery of Fv : Fm in all species was also more rapid in the two treatments that contained UV radiation alone than in those that included PAR. These results suggest that it is the high irradiances of PAR in natural sunlight which are responsible for the photoinhibition of photosynthesis of subtidal seaweeds and that the current ambient irradiances of UV radiation (either UV-B or UV-A) in northern temperate latitudes would not contribute significantly to this photoinhibition.