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DNA-fingerprinting analysis of Blue Ducks (Hymenolaimus malacorhynchos) with two minisatellite probes indicated a decrease in genetic similarity (proportion of DNA bands shared) as geographicExpand
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Genetic relationships within a population of Blue Duck Hymenolaimus malacorhynchos
DNA fingerprinting revealed a very high degree of genetic similarity within a small population of Blue Ducks, supporting observations of limited dispersal. The three major family groups studiedExpand
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Social and demographic characteristics of Blue Duck Hymenolaimus malacorhynchos
A population of Blue Ducks inhabiting the Manganuiateao River in central North Island, New Zealand was studied over 1980-89. The birds were dispersed as pairs throughout the year with each pairExpand
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Visual fields in Blue Ducks Hymenolaimus malacorhynchos and Pink‐eared Ducks Malacorhynchus membranaceus: visual and tactile foraging
Blue Ducks Hymenolaimus malacorhynchos (Anatidae), an IUCN Red Listed Endangered species, reside in headwaters of New Zealand rivers and feed primarily on aquatic invertebrates. However, whether suchExpand
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Nesting of the Black Swan at Lake Ellesmere, New Zealand
Black Swans Cygnus atratus were intro­ duced to New Zealand last century. Thompson (1922) reported the first birds were introduced by the Nelson Acclima­ tisation Society ‘ in, or just before, 1864Expand
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Lingering genetic evidence of North American mallards (Anas platyrhynchos) introduced to New Zealand.
Introduced species are becoming part of the landscape around the world. Unfortunately, in many cases, the exact source population for these introduced species is not known, which can hamper theirExpand
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Survival and band recovery rates of sympatric grey ducks and mallards in New Zealand
We used band recovery data from grey ducks (Anas superciliosa) and mallards (A. platyrhynchos) banded sympatrically during 1957-74 to estimate annual survival and recovery rates. Young birds tendedExpand
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Decline of brown teal (Anas chlorotis) in Northland, New Zealand, 1988 - 99
Numbers of brown teal (Anas chlorotis) present at summer flock sites in Northland, New Zealand declined 65% during 1988-99 and the species' principal rangc contracted to three enclaves locatcd alongExpand
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Diurnal use of time and space by breeding Blue Duck Hymenolaimus malacorhynchos
The diurnal time-activity budgets of two territorial pairs of Blue Duck were measured during the breeding season in New Zealand from August to December 1986. Morning and evening peaks of foragingExpand
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