Temporal variation in the early life-history characteristics of the King George whiting (Sillaginodes punctata) from analysis of otolith microstructure

1996 ◽  
Vol 47 (6) ◽  
pp. 809 ◽  
Author(s):  
AJ Fowler ◽  
DA Short
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Early Life ◽  
Somatic Growth ◽  
South Australia ◽  
Early Life History ◽  
Exponential Relationship ◽  
Life History Characteristics ◽  
Linear Relationships ◽  
Temperature Regimes

This study describes the duration of the settlement season, the somatic and otolith growth rates, and presettlement durations for Sillaginodes punctata at Barker Inlet, South Australia. The settlement season was from June to November, with settlement occurring in two phases over this period. Somatic growth rates ranged from <0.1 to 0.25 mm day-1 depending on age and time of year, making size (SL) a relatively poor indicator of age. Alternatively, otolith size (OL) was strongly related to age, but the linear relationships varied systematically among sampling occasions. Because of variation in somatic growth rates, the SL-OL relationships were relatively poor. The biological intercept method was used to back-calculate fish sizes from otolith increment widths for three samples of fish. These growth trajectories differed considerably, two being logistic in shape and the third being an exponential relationship. Presettlement durations increased from 80 to 130 days between June and September and were inversely related to growth rate. Settlement competence is related more to size than to age. The broad natural variation in early life-history characteristics is likely to relate to water temperature regimes along larval advection pathways through the long settlement season.

Settlement and recruitment of the abalone Haliotis cyclobates Péron, 1816

1999 ◽  
Vol 50 (3) ◽  
pp. 229
Author(s):  
Jonathon Stevenson ◽  
Andrew Melville
Keyword(s):  
Life History ◽  
Early Life ◽  
Seagrass Meadow ◽  
South Australia ◽  
Early Life History ◽  
Hard Substratum ◽  
Abalone Species ◽  
History Of ◽  
Settlement Behaviour ◽  
Hard Substrata

The settlement preference, distribution and juvenile recruitment distribution of Haliotis cyclobates were investigated in a seagrass meadow in Gulf St Vincent, South Australia, in 1993 and 1994. Samples of hard substratum and seagrass were collected from seagrass patches and open areas and examined for newly settled and 0+ recruits. Hard substrata consisted of small rocks, large bivalve shells and bottles. Twelve newly settled recruits (<3 mm) were found: 11 on seagrass and one on hard substratum. Settlement onto seagrass blades is the first field example of an abalone species settling naturally onto soft substratum. 0+ recruits (4–9 mm) were found from March to October, indicating a single spawning and settlement season. 0+ recruits were found on small isolated patches of hard substratum in open and seagrass areas, suggesting that post-settlement migration may have some influence on recruitment patterns. The results indicate that the early life history of Haliotis cyclobates is adapted for enhancing recruitment into seagrass areas. Settlement onto seagrass blades is different from that observed for other species of abalone, and clarification of the specific settlement cue may contribute to the understanding of abalone settlement behaviour.

scholarly journals Local adaptation in brown trout early life-history traits: implications for climate change adaptability

2008 ◽  
Vol 275 (1653) ◽  
pp. 2859-2868 ◽  
Author(s):  
Lasse Fast Jensen ◽  
Michael M Hansen ◽  
Cino Pertoldi ◽  
Gert Holdensgaard ◽  
Karen-Lise Dons Mensberg ◽  
...  
Keyword(s):  
Climate Change ◽  
Life History ◽  
Local Adaptation ◽  
Brown Trout ◽  
Early Life ◽  
Salmo Trutta ◽  
Life History Traits ◽  
Additive Genetic Variance ◽  
Early Life History ◽  
Temperature Regimes

Knowledge of local adaptation and adaptive potential of natural populations is becoming increasingly relevant due to anthropogenic changes in the environment, such as climate change. The concern is that populations will be negatively affected by increasing temperatures without the capacity to adapt. Temperature-related adaptability in traits related to phenology and early life history are expected to be particularly important in salmonid fishes. We focused on the latter and investigated whether four populations of brown trout ( Salmo trutta ) are locally adapted in early life-history traits. These populations spawn in rivers that experience different temperature conditions during the time of incubation of eggs and embryos. They were reared in a common-garden experiment at three different temperatures. Quantitative genetic differentiation ( Q ST ) exceeded neutral molecular differentiation ( F ST ) for two traits, indicating local adaptation. A temperature effect was observed for three traits. However, this effect varied among populations due to locally adapted reaction norms, corresponding to the temperature regimes experienced by the populations in their native environments. Additive genetic variance and heritable variation in phenotypic plasticity suggest that although increasing temperatures are likely to affect some populations negatively, they may have the potential to adapt to changing temperature regimes.

scholarly journals Embryo and larval biology of the deep-sea octocoral Dentomuricea aff. meteor under different temperature regimes

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11604
Author(s):  
Maria Rakka ◽  
António Godinho ◽  
Covadonga Orejas ◽  
Marina Carreiro-Silva
Keyword(s):  
Life History ◽  
Median Survival ◽  
Swimming Speed ◽  
Deep Sea ◽  
Early Life ◽  
Early Life History ◽  
Larval Biology ◽  
Cascading Effects ◽  
Temperature Regimes ◽  
Maximum Temperatures

Deep-sea octocorals are common habitat-formers in deep-sea ecosystems, however, our knowledge on their early life history stages is extremely limited. The present study focuses on the early life history of the species Dentomuricea aff. meteor, a common deep-sea octocoral in the Azores. The objective was to describe the embryo and larval biology of the target species under two temperature regimes, corresponding to the minimum and maximum temperatures in its natural environment during the spawning season. At temperature of 13 ±0.5 °C, embryos of the species reached the planula stage after 96h and displayed a median survival of 11 days. Planulae displayed swimming only after stimulation, swimming speed was 0.24 ±0.16 mm s−1 and increased slightly but significantly with time. Under a higher temperature (15 °C ±0.5 °C) embryos reached the planula stage 24 h earlier (after 72 h), displayed a median survival of 16 days and had significantly higher swimming speed (0.3 ±0.27 mm s−1). Although the differences in survival were not statistically significant, our results highlight how small changes in temperature can affect embryo and larval characteristics with potential cascading effects in larval dispersal and success. In both temperatures, settlement rates were low and metamorphosis occurred even without settlement. Such information is rarely available for deep-sea corals, although essential to achieve a better understanding of dispersal, connectivity and biogeographical patterns of benthic species.

Influences of spawning timing, water temperature, and climatic warming on early life history phenology in western Alaska sockeye salmon

2019 ◽  
Vol 76 (1) ◽  
pp. 123-135 ◽  
Author(s):  
Morgan M. Sparks ◽  
Jeffrey A. Falke ◽  
Thomas P. Quinn ◽  
Milo D. Adkison ◽  
Daniel E. Schindler ◽  
...  
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Early Life ◽  
Sockeye Salmon ◽  
Early Life History ◽  
Life History Stage ◽  
Climatic Warming ◽  
Temperature Regimes ◽  
Close Proximity ◽  
Lake Temperature

We applied an empirical model to predict hatching and emergence timing for 25 western Alaska sockeye salmon (Oncorhynchus nerka) populations in four lake-nursery systems to explore current patterns and potential responses of early life history phenology to warming water temperatures. Given the temperature regimes sockeye salmon experienced during development, we predicted hatching to occur in as few as 58 days to as many as 260 days depending on spawning timing and temperature. For a focal lake spawning population, our climate–lake temperature model predicted a water temperature increase of 0.7 to 1.4 °C from 2015 to 2099 during the incubation period, which translated to a hatching timing that was 16 to 30 days earlier. The most extreme warming scenarios shifted development to approximately 1 week earlier than historical minima and thus climatic warming may lead to only modest shifts in phenology during the early life history stage of this population. The marked variation in the predicted timing of hatching and emergence among populations in close proximity on the landscape may serve to buffer this metapopulation from climate change.

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