habitat fragmentation

Variable pollinator dependence of three Gastrodia species (Orchidaceae) in modified Canterbury landscapes

Pollination is an ecosystem service affected by anthropogenic activity, often resulting in reduced fruit set and increased extinction risk. Orchids worldwide have a wide range of pollination systems, but many New Zealand orchids are self-pollinating. We studied the pollination system of three saprophytic native orchids from the genus Gastrodia in modified landscapes in Canterbury, New Zealand: G. cunninghamii, G. minor, and an undescribed taxon G. “long column”. The species showed two distinct pollination systems.

Roost use by long-tailed bats in South Canterbury: examining predictions of roost-site selection in a highly fragmented landscape

We studied the roosting ecology of the long-tailed bat (Chalinolobus tuberculatus) during the springautumn months from 1998–2002 at Hanging Rock in the highly fragmented landscape of South Canterbury, South Island, New Zealand. We compared the structural characteristics and microclimates of roost sites used by communally and solitary roosting bats with those of randomly available sites, and roosts of C. tuberculatus occupying unmodified Nothofagus forest in the Eglinton Valley, Fiordland. Roosting group sizes and roost residency times were also compared.

Sensitivity of GIS patterns to data resolution: a case study of forest fragmentation in New Zealand

Spatial pattern plays an influential role in the ecological processes of ecosystems, and landscape pattern metrics computed from remotely sensed data offer a way to quantify the correlation between pattern and process. However, the resolution of geographic data affects the landscape metrics obtained from a GIS, with consequent implications for the interpretation of biological effects studied at landscape scales.