988 resultados para Pauw, Cornelius, 1739-1799.
Resumo:
Estudiode los cambios en distribución, estructura por tamaños y niveles de biomasa de los principales recursos pelágicos. La más alta biomasa de anchoveta se registró entre 6 a 14° S; el rango de tamaños fue polimodal (3,0 a 19,0 cm. LT), con moda principal en 14,5 cm. y modas secundarias en 9,5 y 15,5 cm.
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The genetic diversity of populations, which contributes greatly to their adaptive potential, is negatively affected by anthropogenic habitat fragmentation and destruction. However, continental-scale losses of genetic diversity also resulted from the population expansions that followed the end of the last glaciation, an element that is rarely considered in a conservation context. We addressed this issue in a meta-analysis in which we compared the spatial patterns of vulnerability of 18 widespread European amphibians in light of phylogeographic histories (glacial refugia and postglacial routes) and anthropogenic disturbances. Conservation statuses significantly worsened with distances from refugia, particularly in the context of industrial agriculture; human population density also had a negative effect. These findings suggest that features associated with the loss of genetic diversity in post-glacial amphibian populations (such as enhanced fixation load or depressed adaptive potential) may increase their susceptibility to current threats (e.g., habitat fragmentation and pesticide use). We propose that the phylogeographic status of populations (i.e., refugial vs. post-glacial) should be considered in conservation assessments for regional and national red lists.
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Tekijä: Christophorus Tärnström, 1711-1746, laivapastori, tutkimusmatkailija.
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Karttalehdet: Charta öfwer Swerige med tilgränsande länder ; Charta öfwer Storfurstendömet Finland ; Charta öfver Åbo och Björneborgs höfdingedöme ; Charta öfver Wasa höfdingedöme ; Charta öfver Uleåborgs höfdingedöme ; Charta öfver Savolax och Karelens eller Kuopio höfdingedöme ; Charta öfver Nylands och Tavastehus samt Kymmenegårds höfdingedömen. Nimiösivun kuva: Utsigt ifrån Wermasvuori åt sjöarne Jokijärvi och Ilmolanselkä uti Hauho sockn i Nylands och Tavastehus höfdingedöme / ritad af C. P. Hällström ; graverad af J. F. Martin.
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1848.
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1838.
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1847.
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1841.
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1846.
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Périodicité : Mensuel
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1845.
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1844.
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1840.
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1842.
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1843.