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Spatial segregation within the spawning migration of North Eastern Atlantic mackerel (Scomber scombrus) as indicated by juvenile growth patterns.

Jansen T, Campbell A, Brunel T, Worsøe Clausen L - PLoS ONE (2013)

Bottom Line: A similar significant relationship was found between the growth in the first year (derived from the otolith inner winter ring) and latitude for adult mackerel spawning between 44°N (Bay of Biscay) and 54°N (west of Ireland).No such relationship was found in mackerel spawning at more northerly latitudes, possibly as a consequence of increased spatial mixing in a more energetic regime with stronger currents.This study provides previously lacking support for spawning segregation behaviour among North East Atlantic mackerel--an important step towards understanding the migratory behaviour of mackerel and hence the spatiotemporal distribution dynamics around spawning time.

View Article: PubMed Central - PubMed

Affiliation: DTU AQUA-National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark. Tej@aqua.dtu.dk

ABSTRACT
A comparison of growth data (fish length) with latitude shows that southern juvenile mackerel attain a greater length than those originating from further north before growth ceases during their first winter. A similar significant relationship was found between the growth in the first year (derived from the otolith inner winter ring) and latitude for adult mackerel spawning between 44°N (Bay of Biscay) and 54°N (west of Ireland). These observations are consistent with spatial segregation of the spawning migration; the further north that the fish were hatched, the further north they will tend to spawn. No such relationship was found in mackerel spawning at more northerly latitudes, possibly as a consequence of increased spatial mixing in a more energetic regime with stronger currents. This study provides previously lacking support for spawning segregation behaviour among North East Atlantic mackerel--an important step towards understanding the migratory behaviour of mackerel and hence the spatiotemporal distribution dynamics around spawning time.

Show MeSH
Latitude-length relation by mackerel age.Early life observations during the first year show negative latitude-length relations (p = 0.0011), while later observations show no significant correlation. The inclination (slope) parameter (β1) on the Y-axis are the effect of latitude in the model log(mean body length)  =  β0 + β1 * Latitude + βy + ε, where βy is the year-specific effect and ε is the random error term.
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pone-0058114-g001: Latitude-length relation by mackerel age.Early life observations during the first year show negative latitude-length relations (p = 0.0011), while later observations show no significant correlation. The inclination (slope) parameter (β1) on the Y-axis are the effect of latitude in the model log(mean body length)  =  β0 + β1 * Latitude + βy + ε, where βy is the year-specific effect and ε is the random error term.

Mentions: In order to ensure that the observed relationship between latitude and body length after the first year of growth is not a consequence of size- dependent migration, we investigated the variability of this relationship through the first two years of growth. While the earliest observations (July-September) confirmed the negative latitude-length relation, later observations (during the mackerel's second year) showed no significant correlation, consistent with spatial mixing (Figure 1).


Spatial segregation within the spawning migration of North Eastern Atlantic mackerel (Scomber scombrus) as indicated by juvenile growth patterns.

Jansen T, Campbell A, Brunel T, Worsøe Clausen L - PLoS ONE (2013)

Latitude-length relation by mackerel age.Early life observations during the first year show negative latitude-length relations (p = 0.0011), while later observations show no significant correlation. The inclination (slope) parameter (β1) on the Y-axis are the effect of latitude in the model log(mean body length)  =  β0 + β1 * Latitude + βy + ε, where βy is the year-specific effect and ε is the random error term.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3585244&req=5

pone-0058114-g001: Latitude-length relation by mackerel age.Early life observations during the first year show negative latitude-length relations (p = 0.0011), while later observations show no significant correlation. The inclination (slope) parameter (β1) on the Y-axis are the effect of latitude in the model log(mean body length)  =  β0 + β1 * Latitude + βy + ε, where βy is the year-specific effect and ε is the random error term.
Mentions: In order to ensure that the observed relationship between latitude and body length after the first year of growth is not a consequence of size- dependent migration, we investigated the variability of this relationship through the first two years of growth. While the earliest observations (July-September) confirmed the negative latitude-length relation, later observations (during the mackerel's second year) showed no significant correlation, consistent with spatial mixing (Figure 1).

Bottom Line: A similar significant relationship was found between the growth in the first year (derived from the otolith inner winter ring) and latitude for adult mackerel spawning between 44°N (Bay of Biscay) and 54°N (west of Ireland).No such relationship was found in mackerel spawning at more northerly latitudes, possibly as a consequence of increased spatial mixing in a more energetic regime with stronger currents.This study provides previously lacking support for spawning segregation behaviour among North East Atlantic mackerel--an important step towards understanding the migratory behaviour of mackerel and hence the spatiotemporal distribution dynamics around spawning time.

View Article: PubMed Central - PubMed

Affiliation: DTU AQUA-National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark. Tej@aqua.dtu.dk

ABSTRACT
A comparison of growth data (fish length) with latitude shows that southern juvenile mackerel attain a greater length than those originating from further north before growth ceases during their first winter. A similar significant relationship was found between the growth in the first year (derived from the otolith inner winter ring) and latitude for adult mackerel spawning between 44°N (Bay of Biscay) and 54°N (west of Ireland). These observations are consistent with spatial segregation of the spawning migration; the further north that the fish were hatched, the further north they will tend to spawn. No such relationship was found in mackerel spawning at more northerly latitudes, possibly as a consequence of increased spatial mixing in a more energetic regime with stronger currents. This study provides previously lacking support for spawning segregation behaviour among North East Atlantic mackerel--an important step towards understanding the migratory behaviour of mackerel and hence the spatiotemporal distribution dynamics around spawning time.

Show MeSH