Changes in proximate composition and somatic energy content for Pacific sand lance (Ammodytes hexapterus) from Kachemak Bay, Alaska relative to maturity and season

Robards, Martin D.; Anthony, Jill A.; Rose, George A.; Piatt, John F.

doi:10.1016/s0022-0981(99)00102-1

Cited by 76 publications

(63 citation statements)

References 22 publications

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“…There are no comprehensive sources of information on the energy density of seabird prey from the Gulf of Alaska. The energy content varies with the age of the prey, the season, and even the region (Van Pelt et al, 1997;Robards et al, 1999;Iverson et al, 2002), as well as with its condition when ingested (Hunt et al, 2000). We have used updated values from the literature to provide the following estimates of prey energy density: miscellaneous invertebrates, 3 kJ g À1 ; mollusks, 2 kJ g À1 ; gelatinous zooplankton, 0.6 kJ g À1 ; crustacean zooplankton, 2.6 kJ g À1 ; cephalopods, 5.5 kJ g À1 ; fish, 5.7 kJ g À1 ; birds and mammals, 7 kJ g À1 ; carrion, offal and discards, 6 kJ g À1 (Davis et al, 1998).…”

Section: Article In Pressmentioning

confidence: 99%

Prey consumption and energy transfer by marine birds in the Gulf of Alaska

Hunt

Drew

Jahncke

et al. 2005

Deep Sea Research Part II: Topical Studies in Oceanography

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We investigated prey consumption by marine birds and their contribution to cross-shelf fluxes in the northern Gulf of Alaska. We utilized data from the North Pacific Pelagic Seabird Database for modeling energy demand and prey consumption. We found that prey consumption by marine birds was much greater over the continental shelf than it was over the basin. Over the shelf, subsurface-foraging marine birds dominated food consumption, whereas over the basin, surface-foraging birds took the most prey biomass. Daily consumption by marine birds during the non-breeding season (''winter'') from September through April was greater than daily consumption during the breeding season, between May and August. Over the shelf, shearwaters, murres and, in winter, sea ducks, were the most important consumers. Over the basin, northern fulmars, gulls and kittiwakes predominated in winter and storm-petrels dominated in May to August. Our results suggest that marine birds contribute little to cross-shelf fluxes of energy or matter, but they do remove energy from the marine system through consumption, respiration and migration. r

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Section: Article In Pressmentioning

confidence: 99%

Prey consumption and energy transfer by marine birds in the Gulf of Alaska

Hunt

Drew

Jahncke

et al. 2005

Deep Sea Research Part II: Topical Studies in Oceanography

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“…often act as important trophic links between zooplankton and the broad suite of predators that feed on small forage fishes (Wanless et al 2005). the energy densities, growth rates, and fecundity of sand lances all vary spatially and temporally (robards et al 2002;Wanless et al 2005), and this suggests that feeding conditions for sand lances can be highly variable.…”

Section: Introductionmentioning

confidence: 99%

Diet of the Pacific Sand Lance (<em>Ammodytes hexapterus</em>) in the Salish Sea, British Columbia, in the 1960s

Hipfner

Galbraith

2014

Can Field Nat

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The diet of the Pacific Sand Lance (Ammodytes hexapterus) was quantified from the stomach contents of 115 Pacific Sand Lance caught in the Strait of Georgia and Saanich Inlet (Vancouver Island) in the Salish Sea, British Columbia, in the spring and summer of 1966, in the Strait of Georgia in the spring and summer of 1967, and in the Strait of Georgia and Saanich Inlet in the spring and summer of 1968. There were 12 major taxa of prey in diets, 8 of which were Crustacea. Based on an index of relative importance, copepods were the dominant prey in 1966 and 1968, but not in 1967, when cladocerans, larvaceans, and teleosts also were common. The copepods Pseudocalanus spp. and Calanus marshallae were the only taxa to appear in diets in all three years. Pseudocalanus dominated the copepod component of diets in 1966, when sampling occurred in July; unspecified copepod nauplii (an early larval stage) were dominant in 1967 and 1968, when sampling occurred earlier (April to June). With the profound changes that have occurred in the Salish Sea over recent decades, these data can serve as a baseline for comparison.

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“…Myctophids (family Myctophidae), Pacific sand lance Ammodytes hexapterus (hereafter referred to as sand lance), and capelin are highly efficient in this energy transfer (Van Pelt et al 1997, Anthony et al 2000, and vary in nutritional value with season and age (Payne et al 1999, Robards et al 1999a. Because most forage fishes have relatively short life spans, early maturation, and high fecundity, their populations are prone to rapid fluctuations as a result of predation and environmental change (Anderson & Piatt 1999, Chavez et al 2003.…”

Section: Introductionmentioning

confidence: 99%