Idioma:

Bottom-up and top-down control of small pelagic forage fish: factors affecting age-0 herring in the Strait of Georgia, British Columbia

Boldt, Jennifer L. ; Thompson, Matthew ; Rooper, Christopher N. ; Hay, Douglas E. ; Schweigert, Jacob F. ; Quinn, Terrance J. ; Cleary, Jaclyn S. ; Neville, Chrys M.

Marine ecology. Progress series (Halstenbek), 2019-05, Vol.617/618, p.53-66 [Periódico revisado por pares]

Oldendorf: Inter-Research Science Center

Texto completo disponível

Citações Citado por

Enviar para

Título:
Bottom-up and top-down control of small pelagic forage fish: factors affecting age-0 herring in the Strait of Georgia, British Columbia
Autor: Boldt, Jennifer L. ; Thompson, Matthew ; Rooper, Christopher N. ; Hay, Douglas E. ; Schweigert, Jacob F. ; Quinn, Terrance J. ; Cleary, Jaclyn S. ; Neville, Chrys M.
Assuntos: Abundance ; Adults ; Age ; Annual variations ; Aquatic crustaceans ; Biomass ; Blooms ; Competitors ; Density ; Ecosystems ; Environmental factors ; Fish ; Forage ; Forage fishes ; Freshwater fishes ; Larvae ; Life history ; Marine ecosystems ; Marine fishes ; Pelagic fish ; Plankton feeders ; Predators ; Prey ; Primary production ; Recruitment ; Recruitment (fisheries) ; Salmon ; Spatial variations ; Spawning ; Spring ; Survival ; Variability ; Zooplankton
É parte de: Marine ecology. Progress series (Halstenbek), 2019-05, Vol.617/618, p.53-66
Descrição: Small pelagic fish are key planktivores and prey in marine ecosystems, and their population abundances undergo strong temporal and spatial variability. Top-down (predator controlled) and bottom-up (prey-driven) processes during early life history are important for determining forage fish survival and recruitment. We examined biological and environmental factors hypothesized to influence age-0 Pacific herring Clupea pallasi in the Strait of Georgia (SOG), British Columbia, Canada. Primarily bottom-up processes affected interannual variability in age-0 herring abundance and condition, with some evidence of top-down effects on condition. Age-0 herring abundance increased with increasing adult spawning biomass and peaked when most adults spawned about 20 d prior to the peak spring primary production bloom. This timeline would temporally align first-feeding herring larvae with their prey, such as small copepods. Age-0 herring abundance also increased with increasing juvenile salmon abundance, indicating that conditions favourable for herring were also favourable for their predators and competitors. Age-0 herring condition decreased with increasing spawning biomass, increased when most adults spawned closer to the peak spring bloom, increased with increasing temperatures above 8.2°C, and increased then stabilized with increasing prey zooplankton density. Age-0 herring condition had a dome-shaped relationship with predator abundance, indicating that high predator abundances negatively affected fish condition. Study results suggest that density-dependent processes, such as intraspecific competition, may be important in the SOG. A positive correlation between age-0 herring abundance and subsequent age-3 recruit abundance may provide a leading indicator of low recruitment years.
Editor: Oldendorf: Inter-Research Science Center
Idioma: Inglês

Voltar para lista de resultados

Anterior Resultado 8 Avançar Ir para próxima página

Realização: Logos de Redes Sociais:

Bottom-up and top-down control of small pelagic forage fish: factors affecting age-0 herring in the Strait of Georgia, British Columbia

Boldt, Jennifer L. ; Thompson, Matthew ; Rooper, Christopher N. ; Hay, Douglas E. ; Schweigert, Jacob F. ; Quinn, Terrance J. ; Cleary, Jaclyn S. ; Neville, Chrys M.

Oldendorf: Inter-Research Science Center

Buscando em bases de dados remotas. Favor aguardar.