Breeding Biology of the Australasian Gannet Morus Serrator (Gray) at Motu Karamarama, Hauraki Gulf, New Zealand I. the Egg

1984 ◽  
Vol 84 (3) ◽  
pp. 129-136 ◽  
Author(s):  
Elspeth J. Wingham
Keyword(s):  
New Zealand ◽  
Breeding Biology ◽  
Morus Serrator

Breeding biology of the Kakapo Strigops habroptilus on Stewart Island, New Zealand

Ibis ◽  
2008 ◽  
Vol 134 (4) ◽  
pp. 361-373 ◽  
Author(s):  
R. G. POWLESLAND ◽  
B. D. LLOYD ◽  
H. A. BEST ◽  
D. V. MERTON
Keyword(s):  
New Zealand ◽  
Breeding Biology

Breeding biology of the critically endangered Malherbe's parakeet on Maud Island, New Zealand, following the release of captive-bred individuals

2009 ◽  
Vol 57 (6) ◽  
pp. 433 ◽  
Author(s):  
Luis Ortiz-Catedral ◽  
Jonathan C. Kearvell ◽  
Mark E. Hauber ◽  
Dianne H. Brunton
Keyword(s):  
New Zealand ◽  
Clutch Size ◽  
Captive Breeding ◽  
Breeding Biology ◽  
Critically Endangered ◽  
Limiting Factor ◽  
Early Age ◽  
Small Islands ◽  
Austral Spring ◽  
Nesting Sites

We studied a population of the critically endangered Malherbe’s parakeet (Cyanoramphus malherbi), following the release of 62 captive-bred individuals on Maud Island, New Zealand, to identify and characterise nesting sites in a novel island environment. Previous work on Malherbe’s parakeets consisted of limited observations on remnant mainland populations. The age of breeding pairs on Maud Island was 7.2 ± 4.7 months and included both captive-bred individuals of the first release flock and individuals hatched on Maud Island within a year of the first release. Nests were found in hollows of mamaku (Cyathea medullaris), vacant nests of sacred kingfisher (Todiramphus sanctus), a hole in the ground and a hollow in a kohekohe (Disoxylum spectabile). Active nests were found in the austral spring, summer and autumn. Clutch size was 5 eggs. The fledging of three Malherbe’s parakeets was confirmed for one nest 43 days after hatching. Observations of newly fledged individuals around the island indicate that at least seven successful nesting attempts occurred. Consistent with other studies in Cyanoramphus parakeets, our results suggest that availability of nesting sites on small islands may not be a limiting factor for the establishment of additional populations of Malherbe’s parakeets via captive breeding and translocation. The formation of breeding pairs at an early age, the use of diverse nesting sites in regenerating vegetation, and the evidence of successful breeding shortly after release on an island represent encouraging prospects for the conservation of New Zealand’s rarest parakeet.

scholarly journals Th e Relationship Between Fish Length and Otolith Size and Weight of the Australian Ancnovy, En-graulis australis (Clupeiformes, Engraulidae), Retrieved from the Food of the Australasian Gannet, Morus serrator (Suliformes, Sulidae), Hauraki Gulf, New Zealand

Zoodiversity ◽  
2021 ◽  
Vol 55 (4) ◽  
pp. 331-338
Author(s):  
L. A. Jawad ◽  
N. J. Adams
Keyword(s):  
New Zealand ◽  
Fish Length ◽  
Linear Regression Models ◽  
The Pacific ◽  
Ocean Region ◽  
Length Width ◽  
The Pacific Ocean ◽  
Relationship Of ◽  
Morus Serrator ◽  
Otolith Size

Relationships between fish length and otolith length, width and mass were examined in the Australian anchovy Engraulis australis (White, 1790) recovered from the food of Gannet examined from colonies at islands of Horuhoru Rock and Mahuki Islands in the Hauraki Gulf, New Zealand. The relationships between otolith length- fish total length (TL), otolith-weight-TL, and otolith-width-TL were investigated by means of non-linear regression models (TL = 0.54 OL 16.86, TL = 4.39 OW 7.61 and TL = 26.19 OWe 2.2). This study characterizes the first reference available on the relationship of fish size and otolith size and weight for E. australis obtained from bird’s food in the Pacific Ocean region

scholarly journals Long-term changes in the breeding biology of a New Zealand bellbird population suggest plasticity in life-history responses to ecological restoration

2021 ◽  
Author(s):  
Michelle M. Roper ◽  
M.T. Harmer Aaron ◽  
Dianne H Brunton
Keyword(s):  
Life History ◽  
New Zealand ◽  
Reproductive Success ◽  
Ecological Restoration ◽  
Breeding Biology ◽  
Life History Strategies ◽  
Local Conditions ◽  
Anthornis Melanura ◽  
Over Time

AbstractEcological restoration projects provide excellent opportunities to study how animals adapt their life-history strategies in response to changeable environments. A fundamental way animals can optimise reproductive success in changing conditions is trading-off aspects of their breeding system. The New Zealand bellbird (Anthornis melanura) has had a long-term presence on the small restoration island, Tiritiri Matangi Island (Tiri), spanning the island’s degraded agricultural past to its current extensively restored state. We studied the breeding biology of this bellbird population to assess how their reproductive life-history strategies have responded over time to the restoration on Tiri. We compared the current breeding data (2012–2016) of the bellbirds with data from between 2001–2010 (including Baillie, 2011, Cope, 2007), and from 1977–1978 (Anderson and Craig, 2003), prior to the island’s restoration. We also explored associations between abiotic/biotic factors and bellbird reproductive success for the most recent period (2012–2016). Our main finding was that clutch size significantly declined over time from a mean of 3.6 to 2.4 eggs per nest and this decline correlated with increasing population density. This is consistent with a density dependent effect, although further data are required to empirically test this conclusion. Overall, the earliest spring laying dates were in late August and the latest extended to January, with all chicks fledged by the end of February. Nest success was 47% (range 40 – 54%) across 2012–2016, falling within a similar range as previous studies. We found little effect of year, weather, parental age or morphometrics on reproductive success. We observed directional change in patterns of parental investment between 1977–1978 and 2012–2016; in 2012–2016, parents persisted with raising single broods rather than abandoning and re-nesting to raise larger broods. These results suggest that the bellbirds’ life-history traits are plastic in response to local conditions which provides an advantage when repopulating a regenerating or changing habitat.

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