Population Size and Factors Affecting At-Sea Distributions of Four Endangered Procellariids in the Tropical Pacific

Spear, Larry B.; Ainley, David G.; Nur, Nadav; Howell, Steve N. G.

doi:10.2307/1369172

Cited by 48 publications

(41 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Schneider et al (1987) found that seabird associations with fronts was related to the strength of the gradient and Elphick & Hunt (1993) hypothesized that the strength of the discontinuity may determine whether or not seabirds perceive differences between features. Past seabird studies in the eastern tropical Pacific have noted that seabird densities increased at the convergence between the North Equatorial Current and Equatorial Countercurrent, an area with a strong TG (King & Pyle 1957, Ashmole & Ashmole 1967, Gould 1974, King 1974, Spear et al 1995also reviewed in Hunt & Schneider 1987). In our study, currents were defined by discontinuities in the thermocline while water masses were defined by zonal differences in SST and SSS.…”

Section: Environmental Relationshipsmentioning

confidence: 99%

“…There were many other less common species that we could not evaluate due to low sample size within and between years. Our study area encompassed the edge of many of these species ranges (Ribic et al 1992, Spear et al 1995 and in order to address environmental variable associations and the effects of ENSO/LNSO, a larger portion of the Paciflc basin would have to be considered. Spear et al (1995) did this, finding no effects of ENSO/LNSO on the seabird associations with physical variables.…”

Section: Effect Of Ensoflnsomentioning

confidence: 99%

“…Our study area encompassed the edge of many of these species ranges (Ribic et al 1992, Spear et al 1995 and in order to address environmental variable associations and the effects of ENSO/LNSO, a larger portion of the Paciflc basin would have to be considered. Spear et al (1995) did this, finding no effects of ENSO/LNSO on the seabird associations with physical variables. ENSO/ LNSO events do affect seabird populations, particularly in terms of survival and breeding in tropical and mid-latitudes of the Pacific (e.g.…”

Section: Effect Of Ensoflnsomentioning

confidence: 99%

“…This multispecies approach, then, sacrifices details on individual species to look at overall patterns across all species. An alternative approach would be to take an individual species approach as was done by Spear et al (1995); this would give us many more details about individual species. For example, we looked at individual speciesenvironmental relationships for the spring cruises in conjunction with exploring the extent of seabird assemblage relationships to physical features (Ribic & Ainley 1997).…”

Section: Analysis Techniquesmentioning

confidence: 99%

“…ocean, research on the association of seabirds with Work at larger scales has progressed on relationships environmental factors has been concentrated at the of seabirds to latitudinal gradients in sea-surface temcourse and mesoscale levels, e.g. studies of frontal perature (SST), salinity (SSS; Ainley & Boekelheide eddies in the Gulf Stream, Atlantic Ocean (Haney 1983, Ribic & Ainley 1988 and other factors in the Pacific (Spear et al 1995); longitudinal gradients in thermocline depth as they affect feeding flocks in the 'E-mail: caribic@facstaff.wisc.edu Pacific (Ballance et al 1997); and associations of seabirds with water masses in the Indian Ocean (Pocklington 1979). Thus, there exists a mix of studies at different spatial and temporal scales on the relationship of seabird habitat features in trop~cal oceans.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Scale-related seabird-environmental relationships in Pacific equatorial waters, with reference to El Niño-Southern Oscillation events

Ribic¹,

Ainley²,

Spear³

1997

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

ABSTRACT. We assessed the spatial scales at which variability in ocean climate could affect habitat associations of tropical seabirds and whether species-environmental variable relationships at the smallest scale provide insight into occurrence patterns at larger scales. In the eastern tropical Pacific (lOON to 10" S and 140" to 90°W), seabirds were censused on 16 cruises that followed the same tracks every spring and autumn, 1984 to 1991. T h~s study area possesses closely spaced, well-defined water types and the time period was sufficient to include 2 ENSOs (El Nino-Southern Oscillation) and 1 cold water event (LNSO), thus insuring maximum environmental variability. On the cruises, we measured physical features such as sea-surface temperature (SST) and salinity (SSS) at a coarse scale (1 to 100 km) as well as, at the large scale, the identity of surface water masses and current systems. During spring, at the coarse scale, seabirds were associated mainly with a canonical axis consisting of SST and SSS. During autumn, coarse scale seabird/environment associations were defined by a canonical axis composed of SST and thermocline depth; SSS was of secondary importance. Using SST and SSS optima from the coarse scale analysis, we could predict only the water mass associations for lnd~vidual species during spring. Consistent between-year associations with water masses were not found In either season. Regardless of season, seabirds at the large scale were associated most consistently w~t h current systems rather than water masses. At the coarse scale, neither the canonical axes nor the seabird associatlons wlth these axes were affected by ENSO/LNSO events. At the large scale, seabird associations with currents remained the same during the ENSO/LNSO events for sooty tern, black-winged and white-w~nged petrels, and wedge-tailed shearwater. Juan Fernandez petrel, wedge-rumped stormpetrel, and Leach's storm-petrel had different associations with currents during the ENSO/LNSO events. We hypothesize that the effect of ENSO/LNSO events on individual species is mitigated by the ability of species to persist in low productivity waters during the non-ENSO/LNSO years.

show abstract

Section: Environmental Relationshipsmentioning

confidence: 99%

Section: Effect Of Ensoflnsomentioning

confidence: 99%

Section: Effect Of Ensoflnsomentioning

confidence: 99%

Section: Analysis Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Scale-related seabird-environmental relationships in Pacific equatorial waters, with reference to El Niño-Southern Oscillation events

Ribic¹,

Ainley²,

Spear³

1997

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

The relationships of seabird assemblages to physical habitat features in Pacific equatorial waters during spring 1984–1991

Ribic

Ainley

1997

ICES Journal of Marine Science

View full text Add to dashboard Cite

Birds in Coastal and Marine Environments

Barrantes

Chaves‐Campos

2009

Marine Biodiversity of Costa Rica, Central America

View full text Add to dashboard Cite

In Costa Rican coastal and marine environments (e.g., estuaries, mudflats, islands, open ocean) 96 bird species have been recorded, 11% of the total avifauna in the country. This high diversity is primarily explained by the complex topography of the coasts, the large variety of habitats available for coastal and marine birds, and Isla del Coco, a volcanic island that includes a particular marine avifauna. The Pacific coast, including Isla del Coco, possesses a much higher diversity of birds (93 species) than the Caribbean coast (54 species). This difference is likely explained by higher fluctuation in tides, larger extension, and greater topographical complexity on the Pacific coast. There are only 15 coastal or marine birds that reproduce (but not exclusively) in the country. From a conservation perspective, coastal and marine birds have received little attention in Costa Rica. Consequently, contamination, caused by pesticides, sewage, and solid trash, and habitat destruction, due to the construction of tourist infrastructure, seriously threaten the coastal and marine avifauna in Costa Rica.

show abstract

Population Size and Factors Affecting At-Sea Distributions of Four Endangered Procellariids in the Tropical Pacific

Cited by 48 publications

References 22 publications

Scale-related seabird-environmental relationships in Pacific equatorial waters, with reference to El Niño-Southern Oscillation events

Scale-related seabird-environmental relationships in Pacific equatorial waters, with reference to El Niño-Southern Oscillation events

The relationships of seabird assemblages to physical habitat features in Pacific equatorial waters during spring 1984–1991

Birds in Coastal and Marine Environments

Contact Info

Product

Resources

About