Reports on colony size, breeding success and population increase at the only known colony in the Wairarapa. Source: National Library of New Zealand Te Puna Matauranga o Aotearoa, licensed by the ...Department of Internal Affairs for re-use under the Creative Commons Attribution 3.0 New Zealand Licence.
Riccia (Ricciaceae) is a widespread, cosmopolitan genus of thalloid liverworts. Here we document the presence of R. cavernosa Hoffm. in New Zealand for the first time. A full description based on New ...Zealand specimens is provided. Riccia cavernosa was discovered in New Zealand in February 2016 growing on the margins of a series of artificial wetlands constructed to aid in the recovery of a threatened endemic wading bird (Himantopus novaezelandiae). Following a review of the status of R. cavernosa in New Zealand we conclude that the species is most likely a recent natural, long distance trans-Tasman wind-dispersed arrival from Australia where the species is locally common. The discovery increases the number of Riccia reported from New Zealand from 10 to 11. Prior to the discovery of R. cavernosa, only four of the 10 Riccia recorded from New Zealand were considered indigenous. The conservation status of R. cavernosa is briefly discussed and a provisional assessment of 'Threatened/Nationally Critical' assigned to the species using the New Zealand Threat Classification System.
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Egg and chick loss at banded dotterel (Charadrius bicinctus) nests was studied over the 1992/93 season on the Tekapo, Ohau and Ahuriri Rivers in the Central South Island. Egg loss at nests was higher ...on the Ohau and Tekapo Rivers than on the Ahuriri River, especially early in the season. Only 11 % and 12 % of nests fledged one or more chicks on the Tekapo and Ohau Rivers respectively, compared to 42 % of nests on the Ahuriri River. Nests on islands within the braided riverbeds were more successful than nests on the mainland. Proximity of nests to potential predator cover did not influence hatching success although close proximity of nests to rabbit burrows increased the risk of predation. A lack of knowledge of the predator species involved in this study hampers assessment of the impact of various factors on the breeding success of banded dotterels. Further research to identify predators is necessary to target conservation management and better protect banded dotterel and endangered riverbed birds.
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