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- Publisher Website: 10.1111/j.1365-2656.2008.01383.x
- Scopus: eid_2-s2.0-51649113356
- PMID: 18422559
- WOS: WOS:000260052400008
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Article: The impact of climate fluctuation on food availability and reproductive performance of the planktivorous red-billed gull Larus novaehollandiae scopulinus
Title | The impact of climate fluctuation on food availability and reproductive performance of the planktivorous red-billed gull Larus novaehollandiae scopulinus |
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Authors | |
Keywords | Euphausiid availability Nyctiphanes australis El Niño-Southern oscillation Age at first breeding Non-breeding Oceanography |
Issue Date | 2008 |
Citation | Journal of Animal Ecology, 2008, v. 77, n. 6, p. 1129-1142 How to Cite? |
Abstract | 1. Using 41 years of data, we examined annual variations in the reproductive performance of the red-billed gull at the Kaikoura Peninsula, New Zealand and related these to changes in climate, oceanography and the availability of the planktonic euphausiid Nyctiphanes australis, the bird's principal food. 2. In 1994 the population began to decline, and between 1983 and 2003 it was reduced by 51%. Adult non-breeders comprised an average of 32% of the population between 1983 and 1994, but following the decline they averaged only 18%. The age at recruitment changed markedly following the population decline: 27% of 2-year-old males bred for the first time prior to the decline, whereas the corresponding figure after the decline was 38%. The proportion of females commencing to breed as a 3-year-old was not significantly different before or after the decline. 3. An increase in the availability of euphausiids increased the likelihood of breeding and the recruitment of young individuals, caused earlier laying and resulted in an increase in the condition of adults, egg volume of gulls laying two egg clutches, clutch size and fledging success. 4. The relationship between food availability and the number of pairs that bred, laying date, clutch size and fledging success was significantly different prior to and after the population decline. The underlying cause appears to be a compensatory density-dependent mechanism that reduced interspecific competition for food. 5. The relative abundance of N. australis was correlated positively with the Southern Oscillation Index (SOI) and the frequency of occurrence of NE winds. The proportion of non-breeders and mean laying date were correlated negatively with the SOI, and mean egg volume of two egg clutches correlated positively with the SOI. 6. These results emphasize that availability of adult euphausiids is critical for red-billed gulls. We hypothesize that high primary productivity of inshore water near Kaikoura in winter, linked to a stable water column of coastal water and upwelling of additional dissolved inorganic nutrients, increases the availability of adult euphausiids to the red-billed gull as long as the coastal water is not replaced by offshore subtropical water intrusions of warmer, low-nutrient water. © 2008 The Authors. |
Persistent Identifier | http://hdl.handle.net/10722/291856 |
ISSN | 2023 Impact Factor: 3.5 2023 SCImago Journal Rankings: 1.801 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Mills, James A. | - |
dc.contributor.author | Yarrall, John W. | - |
dc.contributor.author | Bradford-Grieve, Janet M. | - |
dc.contributor.author | Uddstrom, Michael J. | - |
dc.contributor.author | Renwick, James A. | - |
dc.contributor.author | Merilä, Juha | - |
dc.date.accessioned | 2020-11-17T14:55:15Z | - |
dc.date.available | 2020-11-17T14:55:15Z | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | Journal of Animal Ecology, 2008, v. 77, n. 6, p. 1129-1142 | - |
dc.identifier.issn | 0021-8790 | - |
dc.identifier.uri | http://hdl.handle.net/10722/291856 | - |
dc.description.abstract | 1. Using 41 years of data, we examined annual variations in the reproductive performance of the red-billed gull at the Kaikoura Peninsula, New Zealand and related these to changes in climate, oceanography and the availability of the planktonic euphausiid Nyctiphanes australis, the bird's principal food. 2. In 1994 the population began to decline, and between 1983 and 2003 it was reduced by 51%. Adult non-breeders comprised an average of 32% of the population between 1983 and 1994, but following the decline they averaged only 18%. The age at recruitment changed markedly following the population decline: 27% of 2-year-old males bred for the first time prior to the decline, whereas the corresponding figure after the decline was 38%. The proportion of females commencing to breed as a 3-year-old was not significantly different before or after the decline. 3. An increase in the availability of euphausiids increased the likelihood of breeding and the recruitment of young individuals, caused earlier laying and resulted in an increase in the condition of adults, egg volume of gulls laying two egg clutches, clutch size and fledging success. 4. The relationship between food availability and the number of pairs that bred, laying date, clutch size and fledging success was significantly different prior to and after the population decline. The underlying cause appears to be a compensatory density-dependent mechanism that reduced interspecific competition for food. 5. The relative abundance of N. australis was correlated positively with the Southern Oscillation Index (SOI) and the frequency of occurrence of NE winds. The proportion of non-breeders and mean laying date were correlated negatively with the SOI, and mean egg volume of two egg clutches correlated positively with the SOI. 6. These results emphasize that availability of adult euphausiids is critical for red-billed gulls. We hypothesize that high primary productivity of inshore water near Kaikoura in winter, linked to a stable water column of coastal water and upwelling of additional dissolved inorganic nutrients, increases the availability of adult euphausiids to the red-billed gull as long as the coastal water is not replaced by offshore subtropical water intrusions of warmer, low-nutrient water. © 2008 The Authors. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of Animal Ecology | - |
dc.subject | Euphausiid availability | - |
dc.subject | Nyctiphanes australis | - |
dc.subject | El Niño-Southern oscillation | - |
dc.subject | Age at first breeding | - |
dc.subject | Non-breeding | - |
dc.subject | Oceanography | - |
dc.title | The impact of climate fluctuation on food availability and reproductive performance of the planktivorous red-billed gull Larus novaehollandiae scopulinus | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2656.2008.01383.x | - |
dc.identifier.pmid | 18422559 | - |
dc.identifier.scopus | eid_2-s2.0-51649113356 | - |
dc.identifier.volume | 77 | - |
dc.identifier.issue | 6 | - |
dc.identifier.spage | 1129 | - |
dc.identifier.epage | 1142 | - |
dc.identifier.eissn | 1365-2656 | - |
dc.identifier.isi | WOS:000260052400008 | - |
dc.identifier.issnl | 0021-8790 | - |