Content with tag doñana .

The alien boatman T verticalis is able to breed successfully in freshwaters

The alien boatman T verticalis is able to breed successfully in freshwaters

The corixid Trichocorixa verticalis originates from North America and is the only aquatic hemipteran alien to Europe. It is spreading in south-west Iberia where it is the dominant corixid in permanent, saline wetlands, where it may have excluded halotolerant native corixid species. In the Doñana wetland complex in south-west Spain, it is abundant in temporary brackish ponds but almost absent from temporary fresh ponds where the native Sigara lateralis is the dominant corixid. an outdoor experiment was conducted to test whether the alien is intolerant of low salinities, or if it can be competitively excluded by the native species S. lateralis. Single species tanks were established for each species in semi-natural conditions, as well as mixed species tanks and controls lacking corixids. Trichocorixa verticalis was able to complete its life-cycle at a low salinity of 2 g/l. Compared to S. lateralis, it showed higher daily adult mortality and nymph production, but a shorter generation time. When mixed together, both species had lower adult mortality than in the alone treatment, suggesting they can coexist. Adult abundance at the end of the experiment was highest for T. verticalis, which performed better in mixed tanks whereas S. lateralis performed better alone. These results confirm that T. verticalis can tolerate freshwaters and suggest that its rarity in these ponds in nature is due to other ecological factors such as dispersal limitation, poor adaptation to fluctuating water levels, or the effects of ectoparasitic water mites known to prefer the alien as a host. informacion[at]ebd.csic.es: Carbonell et al (2020) An experimental test of interspecific competition between the alien boatman Trichocorixa verticalis and the native corixid Sigara lateralis (Hemiptera, Corixidae). Aquatic Invasions 15(2): 318– 334 DOI 10.3391/ai.2020.15.2.07


https://www.reabic.net/aquaticinvasions/2020/AI_2020_Carbonell_etal.pdf

Content with tag doñana .

The alien boatman T verticalis is able to breed successfully in freshwaters

The corixid Trichocorixa verticalis originates from North America and is the only
aquatic hemipteran alien to Europe. It is spreading in south-west Iberia where it is
the dominant corixid...

Invasive plants and urban development: a bad combination for coastal vegetation

Land-use intensification and biological invasions are two of the most important global change pressures driving biodiversity loss. However, their combined impacts on biological communities have...

Nitrate pollution in surface waters of the Doñana catchment

The aquatic ecosystems of Doñana and those of its watersheds are highly threatened by multiple human pressures. Among them, the strong development of agriculture and the increase of population have...

The invasive red swamp crayfish increases infection of the amphibian chytrid fungus

Chytridiomycosis, caused by Batrachochytrium dendrobatidis (Bd), is considered one of the most important causes for the decline of amphibian populations worldwide. Identifying potential biological...