Feeding ecology of little terns Sterna albifrons sinensis in south-eastern Australia and the effects of pilchard mass mortality on breeding success and population size

Iain Taylor, Emma L. Roe

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12 Citations (Scopus)

Abstract

Little terns Sterna albifrons sinensis breeding on Rigby Island, Gippsland Lakes in south-east Australia fed their chicks entirely on juvenile fish of the families Clupeidae, Engraulidae, Pomatomidae and Carangidae, including pilchard Sardinops neopilchardus, southern anchovy Engraulis australis and blue sprat Spratelloides robustus. The entrance channel to the Lakes was an important feeding site. Numbers feeding there increased on the flood tide and decreased on the ebb tide. Their dive rates followed the same pattern, suggesting they depended on shoals of juvenile fish entering the estuary during high tide. The number feeding varied from day to day, and dive rates were positively correlated with numbers, suggesting that the abundance of juvenile fish entering the channel also varied from day to day. There was no evidence that breeding success or number of breeding pairs were adversely affected by the 1995 mass mortalities of pilchard in the area. However, breeding success was reduced significantly in 1999 and 2000 following the 1998/1999 pilchard mortality. The 1995 mortality affected mainly larger size classes of pilchard, whereas the 1998/1999 mortality also affected younger age classes. This difference may explain why little terns seemed only to be adversely affected by the second mortality event.
Original languageEnglish
Pages (from-to)799-808
Number of pages10
JournalMarine and Freshwater Research
Volume55
Issue number8
DOIs
Publication statusPublished - 2004

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Sterna
mass mortality
feeding ecology
sardines
breeding population
Laridae
reproductive success
population size
ecology
mortality
tide
breeding
tides
fish
Engraulidae
Sardinops
Pomatomidae
lake
Clupeidae
lakes

Cite this

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title = "Feeding ecology of little terns Sterna albifrons sinensis in south-eastern Australia and the effects of pilchard mass mortality on breeding success and population size",
abstract = "Little terns Sterna albifrons sinensis breeding on Rigby Island, Gippsland Lakes in south-east Australia fed their chicks entirely on juvenile fish of the families Clupeidae, Engraulidae, Pomatomidae and Carangidae, including pilchard Sardinops neopilchardus, southern anchovy Engraulis australis and blue sprat Spratelloides robustus. The entrance channel to the Lakes was an important feeding site. Numbers feeding there increased on the flood tide and decreased on the ebb tide. Their dive rates followed the same pattern, suggesting they depended on shoals of juvenile fish entering the estuary during high tide. The number feeding varied from day to day, and dive rates were positively correlated with numbers, suggesting that the abundance of juvenile fish entering the channel also varied from day to day. There was no evidence that breeding success or number of breeding pairs were adversely affected by the 1995 mass mortalities of pilchard in the area. However, breeding success was reduced significantly in 1999 and 2000 following the 1998/1999 pilchard mortality. The 1995 mortality affected mainly larger size classes of pilchard, whereas the 1998/1999 mortality also affected younger age classes. This difference may explain why little terns seemed only to be adversely affected by the second mortality event.",
author = "Iain Taylor and Roe, {Emma L.}",
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T1 - Feeding ecology of little terns Sterna albifrons sinensis in south-eastern Australia and the effects of pilchard mass mortality on breeding success and population size

AU - Taylor, Iain

AU - Roe, Emma L.

N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Marine and Freshwater Research. ISSNs: 1323-1650;

PY - 2004

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N2 - Little terns Sterna albifrons sinensis breeding on Rigby Island, Gippsland Lakes in south-east Australia fed their chicks entirely on juvenile fish of the families Clupeidae, Engraulidae, Pomatomidae and Carangidae, including pilchard Sardinops neopilchardus, southern anchovy Engraulis australis and blue sprat Spratelloides robustus. The entrance channel to the Lakes was an important feeding site. Numbers feeding there increased on the flood tide and decreased on the ebb tide. Their dive rates followed the same pattern, suggesting they depended on shoals of juvenile fish entering the estuary during high tide. The number feeding varied from day to day, and dive rates were positively correlated with numbers, suggesting that the abundance of juvenile fish entering the channel also varied from day to day. There was no evidence that breeding success or number of breeding pairs were adversely affected by the 1995 mass mortalities of pilchard in the area. However, breeding success was reduced significantly in 1999 and 2000 following the 1998/1999 pilchard mortality. The 1995 mortality affected mainly larger size classes of pilchard, whereas the 1998/1999 mortality also affected younger age classes. This difference may explain why little terns seemed only to be adversely affected by the second mortality event.

AB - Little terns Sterna albifrons sinensis breeding on Rigby Island, Gippsland Lakes in south-east Australia fed their chicks entirely on juvenile fish of the families Clupeidae, Engraulidae, Pomatomidae and Carangidae, including pilchard Sardinops neopilchardus, southern anchovy Engraulis australis and blue sprat Spratelloides robustus. The entrance channel to the Lakes was an important feeding site. Numbers feeding there increased on the flood tide and decreased on the ebb tide. Their dive rates followed the same pattern, suggesting they depended on shoals of juvenile fish entering the estuary during high tide. The number feeding varied from day to day, and dive rates were positively correlated with numbers, suggesting that the abundance of juvenile fish entering the channel also varied from day to day. There was no evidence that breeding success or number of breeding pairs were adversely affected by the 1995 mass mortalities of pilchard in the area. However, breeding success was reduced significantly in 1999 and 2000 following the 1998/1999 pilchard mortality. The 1995 mortality affected mainly larger size classes of pilchard, whereas the 1998/1999 mortality also affected younger age classes. This difference may explain why little terns seemed only to be adversely affected by the second mortality event.

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