Diel-depth distributions of fish larvae off the Balearic Islands (western Mediterranean) under two environmental scenarios

Olivar, M. Pilar; Sabatés, Ana; Alemany, F.; Balbín, Rosa; Puelles, María Luz Fernández de; Torres, Asvin P.

doi:10.1016/j.jmarsys.2013.10.009

Cited by 42 publications

(29 citation statements)

References 71 publications

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“…The myctophid group showed short dispersal scales and a steep distance-decay slope comparable with those of other large-bodied passive dispersers (i.e., gelatinous zooplankton and macrozooplankton). This evidence of dispersal limitation for myctophids is likely a result of their migration patterns being mostly vertical (rather than horizontal), as they move daily between the mesopelagic and epipelagic zones 43 . In contrast, numerous marine megafauna, such as large pelagic fish and marine mammals, actively move horizontally, either to forage for food or to complete long-distance migration 44 .…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, previous research has demonstrated a positive relationship between dispersal distance and body size for such megafauna 45 . For myctophids, horizontal movement occurs predominantly as larvae, with passive transport by ocean currents in epipelagic waters 43 . The observed similarity in dispersal patterns of myctophids and macrozooplankton may thus arise from the same processes: passive horizontal dispersion of larvae, with movement as juvenile and adults mainly devoted to diel vertical behavior.…”

Section: Discussionmentioning

confidence: 99%

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Large-scale ocean connectivity and planktonic body size

et al. 2018

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Global patterns of planktonic diversity are mainly determined by the dispersal of propagules with ocean currents. However, the role that abundance and body size play in determining spatial patterns of diversity remains unclear. Here we analyse spatial community structure - β-diversity - for several planktonic and nektonic organisms from prokaryotes to small mesopelagic fishes collected during the Malaspina 2010 Expedition. β-diversity was compared to surface ocean transit times derived from a global circulation model, revealing a significant negative relationship that is stronger than environmental differences. Estimated dispersal scales for different groups show a negative correlation with body size, where less abundant large-bodied communities have significantly shorter dispersal scales and larger species spatial turnover rates than more abundant small-bodied plankton. Our results confirm that the dispersal scale of planktonic and micro-nektonic organisms is determined by local abundance, which scales with body size, ultimately setting global spatial patterns of diversity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Large-scale ocean connectivity and planktonic body size

et al. 2018

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“…Observations of recruitment in the Bay of Palma (Cabanellas-Reboredo et al, 2009a) have pointed to a second larval peak in January; however, this data shows that our particular shallow population cannot be the source of this second peak. It is possible that populations at greater depths are responsible for a second spawning period, as bivalve spawning triggers are related to water temperature and the thermocline around the island of Mallorca is approximately 20 m depth during the summer months and 60 m during the winter months (Reglero et al, 2013;Olivar et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Reproductive investment of the pen shell Pinna nobilis Linnaeus, 1758 in Cabrera National Park (Spain)

et al. 2017

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The spawning period can be a period of particular vulnerability for a species. In hermaphroditic species like the long-lived pen shell Pinna nobilis different costs could be associated with female, male or hermaphrodite stages. Here we evaluate gonad development in a population with few anthropogenic pressures and describe the timing and succession of developmental stages, determine the ratio of the sexes and the condition of the animals. We assess resource mobilisation and associated costs through the relationship between stable isotopes and condition indexes with reproductive parameters and evaluate the role of the adductor muscle as storage organ used in gonad maturation. In our study area only one spawning season is observed, starting in May and peaking in June-July. The onset of spawning coincides with water temperatures of 20 °C. Condition indexes drop during the spawning period and recover afterwards to reach pre-spawning values in November. Stable isotope signals are negatively related to the gonadal condition index, while the CN ratio shows a positive correlation with the same index. Additionally, the muscle condition index sharply decreases after the start of the spawning season, which suggests that P. nobilis uses the reserves stored in the adductor muscle for reproduction as in other Pinnidae species. Reproductive indices and stable isotopes ratios indicate ‘capital breeding’ as reproductive strategy of the pen shell. Decreased muscle force could mean a higher vulnerability during the summer period, coinciding with the peak in recreational activities involving poaching and anchoring.

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“…The plankton oblique tows were carried with a constant speed of 2 knots lasting from 12 to 15 minutes out to a depth of 100 m, wherever possible, because this layer characterizes the majority of the fish larvae in the study areas (Olivar et al, , 2014Sabatés et al, 2008). The larval fish A C C E P T E D M A N U S C R I P T…”

Section: Ichthyoplankton and Oceanographic Samplingmentioning

confidence: 99%

“…collecting procedure was conducted during day and night, because, during the summer, fish pelagic larvae are more concentrated in the surface layer during the night and more dispersed along the column water during the day Sabatés et al, 2008), whereas the opposite occurs at least for most abundant mesopelagic species larvae (Olivar, 2014).…”

Section: Accepted Manuscriptmentioning

confidence: 99%