The taxonomy of Procellariiformes, particularly petrels and shearwaters, is still unresolved. The Manx shearwater Puffinus puffinus is one of the best studied seabirds worldwide. Most of the information known on this seabird is focused on the northern core populations where the species is abundant. However, the species shows a high number of peripheral populations, which are extremely small and difficult to study in comparison to central populations. Using an integrative approach, we provided significant evidence of phenological, morphological, acoustic, plumage colour and genetic differentiation of the Canarian Manx shearwaters (the most southern population) from the northern breeding colonies, which is compatible with a long period of isolation. Birds from the Canary Islands breed around 2-3 months earlier, are smaller and lighter and show darker underwing plumage than those from northern populations. In addition, Canarian call features are different from the northern populations. Finally, genetic analyses of the mitochondrial control region indicate an incipient genetic differentiation of Canarian Manx shearwaters from the other breeding populations. The Canarian population holds a small number of breeding colonies and it is declining, so accurate taxonomic recognition critically affects conservation efforts. For all the aforementioned reasons, we propose to rank the Canarian breeding population as a new taxon by presenting the formal description of a new subspecies Puffinus puffinus canariensis ssp. nov.

A block-windowed burst orthogonal frequency division multiplexing (OFDM) technique which is a multicarrier technique with power spectral density similar to the filtered OFDM approach, since it also employs smoother, non-rectangular windows, is presented. However, it does not need a cyclic prefix, which means the overall power and spectral efficiencies are higher. An appropriate receiver for typical time-dispersive channels, allowing 2 dB of gain relatively conventional OFDM schemes is also presented. Introduction:The debate over the next generation mobile network standards has made clear that the future of wireless communication stands on higher data rates, spectral efficiency and flexibility requirements [1]. Over the past two decades, OFDM has been used due to its robustness over multipath propagation, owing to a time guard interval added to each symbol and trivial signal generation/separation through the inverse fast Fourier transform/fast Fourier transform (IFFT/FFT) processing blocks [2]. Despite the fact that the cyclic prefix (CP) leads to a simplified frequency domain equalisation (FDE) with only a single tap equaliser per carrier, it is pure redundancy (0.125 to 0.25% of the symbol period), reducing the effective throughput and worsening the spectral efficiency [3].In this Letter, we introduce a new transceiver scheme called blockwindowed burst OFDM (BWB-OFDM), which aims to reach a compromise between higher data rate and spectrum confinement. By stressing the FDE we can reduce significantly the amount of redundancy introduced to oppose the channel effects, thereby reducing bit error rate (BER). With this scheme, one can reach a better spectrum confinement keeping the same data rate that CP-OFDM provides, or alternatively reach higher rates, keeping the spectrum of the CP-OFDM scheme.

13 species are added to the Portuguese Lepidoptera fauna, of which three are new for the Iberian Peninsula, and two species deleted, mainly as a result of fieldwork undertaken by the authors and others in 2021. In addition, second and third records for the country, new province records and new host-plant data for a number of species are included. A summary of recent papers affecting the Portuguese fauna is included.

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