scholarly journals Population dynamics and zooplankton-predation impact of the indigenous scyphozoan Aurelia aurita and the invasive ctenophore Mnemiopsis leidyi in Limfjorden (Denmark)

2012 ◽  
Vol 7 (2) ◽  
pp. 147-162 ◽  
Author(s):  
Hans Ulrik Riisgård ◽  
Caroline Madsen ◽  
Coralie Barth-Jensen ◽  
Jennifer Purcell
2018 ◽  
Vol 33 (1) ◽  
pp. 33
Author(s):  
Vicencio De La Cruz -Francisco ◽  
Liliana Flores -Galicia

RESUMEN. Medusas, sifonóforos y ctenóforos son organismos ecológicamente importantes por su papel como depredadores voraces en la cadena trófica, ya que en altas densidades ocasionan problemas económicos. En las costas mexicanas del Golfo de México existe conocimiento de la riqueza taxonómica de estos animales macrozooplanctónicos, pero aún se desconoce qué especies se encuentran en los arrecifes coralinos del norte de Veracruz. Este estudio presenta los primeros registros de este grupo para el Sistema Arrecifal Lobos-Tuxpan. Se identificaron tres especies de medusas, un sifonóforo y dos especies de ctenóforos a partir de registros fotográficos obtenidos en los arrecifes Tuxpan, Enmedio, Tanhuijo, Oro Verde y Lobos. El taxón Cyanea sp. se registra por primera vez para el suroeste del Golfo de México y Cestum veneris es nuevo registro para el litoral veracruzano. Las especies Aurelia aurita (medusa), Physalia physalis (sifonóforo) y Mnemiopsis leidyi (ctenóforo) se observaron en la mayoría de los arrecifes estudiados. La información aquí presentada puede ser útil para el sector turístico al evitar las medusas y sifonóforos que son tóxicos.First records of jellyfish (Cubozoa, Scyphozoa), Siphonophores (Hydrozoa), and Ctenophores (Tentaculata) of the Lobos-Tuxpan Reef System, MexicoABSTRACT. Jellyfish, siphonophores and ctenophores are ecologically important organisms due to their role as voracious predators in the trophic chain, which in high densities may cause economic problems. There is knowledge of the taxonomic wealth of these macrozooplanktonic animals in the Mexican coasts of the Gulf of Mexico, but it is still unknown what species are found in the coral reefs from the north of Veracruz. This study presents the first records of this group for the Lobos-Tuxpan Reef System. Three species of jellyfish, one siphonophore and two ctenophores, were identified through photographic records belonging to the Tuxpan, Enmedio, Tanhuijo, Oro Verde and Lobos reefs. For the first time, the species Cyanea sp. for the South-West of the Gulf of Mexico and Cestum veneris for the Veracruz coast are recorded. The species Aurelia aurita (jellyfish), Physalia physalis (siphonophore) and Mnemiopsis leidyi (ctenephore) were observed in most of the studied reefs. The information provided here may be useful in the tourist sector to avoid toxic jellyfish and siphonophores.


2019 ◽  
Vol 286 (1901) ◽  
pp. 20190036 ◽  
Author(s):  
Hanno Seebens ◽  
Elizabeta Briski ◽  
Sara Ghabooli ◽  
Tamara Shiganova ◽  
Hugh J. MacIsaac ◽  
...  

The number of released individuals, which is a component of propagule pressure, is considered to be a major driver for the establishment success of non-native species. However, propagule pressure is often assumed to result from single or few release events, which does not necessarily apply to the frequent releases of invertebrates or other taxa through global transport. For instance, the high intensity of global shipping may result in frequent releases of large numbers of individuals, and the complexity of shipping dynamics impedes predictions of invasion dynamics. Here, we present a mathematical model for the spread of planktonic organisms by global shipping, using the history of movements by 33 566 ships among 1477 ports to simulate population dynamics for the comb jelly Mnemiopsis leidyi as a case study. The degree of propagule pressure at one site resulted from the coincident arrival of individuals from other sites with native or non-native populations. Key to sequential spread in European waters was a readily available source of propagules and a suitable recipient environment. These propagules were derived from previously introduced ‘bridgehead’ populations supplemented with those from native sources. Invasion success is therefore determined by the complex interaction of global shipping and local population dynamics. The general findings probably hold true for the spread of species in other complex systems, such as insects or plant seeds exchanged via commercial trade or transport.


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