Interannual variation in larval abundance and growth in snapper Chrysophrys auratus (Sparidae) is related to prey availability and temperature

2013 ◽  
Vol 487 ◽  
pp. 151-162 ◽  
Author(s):  
HM Murphy ◽  
GP Jenkins ◽  
PA Hamer ◽  
SE Swearer
Keyword(s):  
Interannual Variation ◽  
Prey Availability ◽  
Larval Abundance

Interannual variation in larval survival of snapper (Chrysophrys auratus, Sparidae) is linked to diet breadth and prey availability

2012 ◽  
Vol 69 (8) ◽  
pp. 1340-1351 ◽  
Author(s):  
Hannah M. Murphy ◽  
Gregory P. Jenkins ◽  
Paul A. Hamer ◽  
Stephen E. Swearer
Keyword(s):  
Niche Breadth ◽  
Prey Availability ◽  
Larval Survival ◽  
Trophic Niche ◽  
Foraging Strategies ◽  
Feeding Strategies ◽  
Larval Abundance ◽  
Larval Diet ◽  
Larval Size ◽  
Prey Quality

Larval snapper ( Chrysophrys auratus , Sparidae) sampled over 7 years had different diets and feeding strategies between years with lower versus higher larval and 0+ abundances. We analysed stomach contents of snapper larvae from each year to determine diet composition, prey selectivity, prey quality, and trophic niche breadth and compared larval diet with prey availability. Snapper larvae from higher abundance years were specialized foragers selecting for calanoid nauplii at 2–4 mm standard length (SL) and calanoid copepodites and cladocerans at >4 mm SL. These larvae were characterized by either a constant or dome-shaped trophic niche breadth and an increase in prey quality (size of consumed prey) with increasing larval size. Snapper larvae from lower abundance years were generalist foragers characterized by an increase in trophic niche breadth, but not prey quality, with increasing larval size. Changes in foraging strategies were concordant with changes in the prey environment, with low zooplankton densities corresponding with generalist diet (lower larval abundance) years and high zooplankton densities with specialist diet (higher larval abundance) years. These findings suggest that snapper larval survival and juvenile recruitment strength is linked to changes in larval diet that relate to prey abundance and composition.

scholarly journals Blepharipoda spinosa (H. Milne Edwards & Lucas, 1841) and Lepidopa chilensis Lenz, 1902 (Crustacea: Hippoidea) larvae on a north-central zone of Chile

2021 ◽  
Vol 49 (4) ◽  
pp. 678-683
Author(s):  
Armando Mujica ◽  
Francisca González-Salas ◽  
María Luisa Nava
Keyword(s):  
Interannual Variation ◽  
Central Zone ◽  
Reproductive Activity ◽  
Development Stage ◽  
Sandy Beaches ◽  
Larval Abundance ◽  
Frequency Of Occurrence ◽  
Sampling Area ◽  
North Central ◽  
Development Stages

The larvae of Blepharipoda spinosa and Lepidopa chilensis were collected from Chile's north-central coast (Paposo 25.0ºS and Oscuro Port 31.5ºS) in each February of 2013-2017. Larvae were separated by their development stage. Their abundance, occurrence, and distribution concerning its proximity to the coast were analyzed. Larval abundance and frequency of occurrence were low in both species. Zoea I dominated the highest concentrations detected in coastal stations and near the study area's longest sandy beaches. Interannual variation of larvae was seen in the abundance and composition by development stages. The highest abundance of B. spinosa larvae was found in February 2016, while L. chilensis larvae had the highest abundance in February 2014. Their presence and development stages in the wide sampling area provide information on both species' distribution and reproductive activity.

Interannual variation in life-cycle characteristics of the veined squid (Loligo forbesi) in Scottish (UK) waters

2005 ◽  
Vol 18 (4) ◽  
pp. 327-340 ◽  
Author(s):  
Graham J. Pierce ◽  
Alain F. Zuur ◽  
Jennifer M. Smith ◽  
M. Begoña Santos ◽  
Nick Bailey ◽  
...  
Keyword(s):  
Life Cycle ◽  
Interannual Variation ◽  
Loligo Forbesi

Spatial ecology and growth in early life stages of bay anchovy Anchoa mitchilli in Chesapeake Bay (USA)

2020 ◽  
Vol 651 ◽  
pp. 125-143
Author(s):  
TD Auth ◽  
T Arula ◽  
ED Houde ◽  
RJ Woodland
Keyword(s):  
Chesapeake Bay ◽  
Spatial Ecology ◽  
Environmental Variability ◽  
Larval Growth ◽  
Larval Abundance ◽  
Spatial And Temporal Variability ◽  
Estuarine Ecosystem ◽  
Anchoa Mitchilli ◽  
Larval Production ◽  
Bay Anchovy

The bay anchovy Anchoa mitchilli is the most abundant fish in Chesapeake Bay (USA) and is a vital link between plankton and piscivores within the trophic structure of this large estuarine ecosystem. Baywide distributions and abundances of bay anchovy eggs and larvae, and larval growth, were analyzed in a 5 yr program to evaluate temporal and spatial variability based on research surveys in the 1995-1999 spawning seasons. Effects of environmental variability and abundance of zooplankton that serve as prey for larval bay anchovy were analyzed. In the years of these surveys, 97.6% of eggs and 98.8% of larvae occurred in the polyhaline lower bay. Median egg and larval abundances differed more than 10-fold for surveys conducted in the 5 yr and were highest in the lower bay. Within years, median larval abundance (ind. m-2) in the lower bay was generally 1-2 orders of magnitude higher than upper-bay abundance. Salinity, temperature, and dissolved oxygen explained 12% of the spatial and temporal variability in egg abundances and accounted for 27% of the variability in larval abundances. The mean, baywide growth rate for larvae over the 5 yr period was 0.75 ± 0.01 mm d-1, and was best explained by zooplankton concentration and feeding incidence. Among years, mean growth rates ranged from 0.68 (in 1999) to 0.81 (in 1998) mm d-1 and were fastest in the upper bay. We identified environmental factors, especially salinity, that contributed to broadscale variability in egg and larval production.

Annual and interannual variation in boreal forest aerosol particle number and volume concentration and their connection to particle formation

Tellus B ◽  
2008 ◽  
Vol 60 (4) ◽  
Author(s):  
Miikka Dal Maso ◽  
Antti Hyvärinen ◽  
Mika Komppula ◽  
Peter Tunved ◽  
Veli-Matti Kerminen ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Aerosol Particle ◽  
Interannual Variation ◽  
Particle Number ◽  
Volume Concentration ◽  
Particle Formation
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