49 resultados para Sulphur print


Relevância:

10.00% 10.00%

Publicador:

Resumo:

Fences must be used with care in biodiversity conservation to avoid unintended consequences.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Although global biodiversity is declining, local ecosystems are not systematically losing diversity, but rather experiencing rapid turnover in species.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Here, we describe the development of sporangial and gametangial conceptacles for Amphiroa beauvoisii and A. vanbosseae; sporangial conceptacles only for A. misakiensis; and gametangial conceptacles only for A. cryptarthrodia and A. rigida. The descriptions are based on the observation of histological preparations obtained from 112 specimens collected from the Gulf of California, in Mexico, and the Azores archipelago of Portugal. Information on the development of the sporangial conceptacle pore and conceptacle senescence is here described and illustrated for the first time. Four development patterns were observed: two for sporangial conceptacles; one for spermatangial conceptacles; and one for carposporangial conceptacles. The phases of development of the sporangial conceptacle were found to be useful in delimiting species within the genus. Based on the sporangium location on the cavity floor and the pore canal anatomy, the species A. beauvoisii, A. misakiensis and A. vanbosseae can be distinguished from each other.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © 2014 The Authors. Oikos © 2014 Nordic Society Oikos.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

New studies are giving ecologists some hope of controlling red lionfish, a voracious predator that has invaded the Atlantic.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Vegetation attributes were consistent with the successional stage of each dome in the primary sere; however, the geomorphologic units did not follow the same pattern. The influence of the rates of plant colonization and soil formation are responsible for the decrease of the successional rates from footslopes, to summits, to slopes. The vegetation successionally changes from Juniperus scrub, to Juniperus wood and forest, and there is little species replacement since the similarity in species composition is high between the 3 domes.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Deep Ocean Species. The little that is known mostly comes from collected specimens. L.A. Rocha et al. Letter "Specimen collection: An essential tool" (23 May, 344: 814) brilliantly discuss the importance of specimen collection and present the evolution of collecting since the mid-19th century until our present strict codes and conducts. However, it is also important to emphasize the fact that the vast majority of deep ocean macro-organisms are only known to us because of collection and this is a strong argument that should be present in our actions as scientists. If the deep is considered the least known of Earth’s habitats (1% or so according to recent estimates) then what awesome collection of yet to discover species are still there to be properly described? As the authors point citing (1), something around 86% of species remain unknown. Voucher specimens are fundamental for the reasons pointed out and perhaps the vast depths of the World’s oceans are the best example of that importance. The resumed report of 2010 Census of Marine Life (2) showed that among the millions of specimens collected in both familiar and seldom-explored waters, the Census found more than 6,000 potentially new species and completed formal descriptions of more than 1,200 of them. It also found that a number of rare species are in fact common. Voucher specimens are essential and, again agreeing with L.A. Rocha et al. Letter (see above), the modern approach for collecting will not be a cause for extinctions but instead a valuable tool for knowledge, description and even, as seen above, a way to find out that supposed rare species may not be that rare and even prove to reach abundant populations.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © 2014 Société Française d’Ichtyologie.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © Marine Biological Association of the United Kingdom, 2014.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © Springer-Verlag Berlin Heidelberg and AWI 2014.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © 2014 The Pennsylvania State University, University Park, PA.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Copyright © 2014 Entomological Society of America.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Predators and Tourism Increase Intolerance? A. Treves and J. Bruskotter Perspective in Ecology "Tolerance for Predatory Wildlife" (2 May, 344: 476) suggest that intolerance for predators do not fit into the conventional view of perceived threats for livelihoods but instead by complex social factors. Although the above perspective focuses in jaguars, wolves, lions and bears, the same reasoning is perfectly applied to other economical contexts and different human-wildlife interactions. Nature tourism is a growing industry attracting a significant number of people to exotic places to see wildlife and, of course, many predators are on the main "menu". [...].