Spatial and short-term variability of larval, post-larval and macrobenthic assemblages associated with subtidal kelp forest ecosystems in Central Chile

Carrasco, Sergio A.; Vandecasteele, Loes; Rivadeneira, Marcelo M.; Fernández, Miriam; Pérez‐Matus, Alejandro

doi:10.1080/17451000.2017.1322704

Cited by 6 publications

(8 citation statements)

References 56 publications

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“…In this context, the Coquimbo Bay system is located within an important upwelling center (Moraga et al, 2001;Thiel et al, 2007), with copepods dominating the zooplankton community structure, while euphausiids are frequently observed in lower abundances (Mattos and Mujica, 2012;Torreblanca et al, 2016) as response to extensive diel vertical migration into the oxygen minimum zone (Thiel et al, 2007). The presence of amphipods and swimming nereid polychaetes in nocturnal pelagic assemblages is not rare, and has been associated to the incidence of artificial lights in shallow depths (<30 m) in the former (Carrasco et al, 2017), or to the presence of reproductive stages (i.e., epitokes) attracted by lunar phases in the latter (Fong, 1993). Consistently with the present records, the presence of the polychaete P. gallapagensis has been reported in stomach content of individuals D. gahi from Peru (Cardoso et al, 1998) as well as in other members of the Family Loliginidae (Rocha et al, 1994), whereas amphipods have been recorded in the Atlantic Ocean (Arkhipkin et al, 2013).…”

Section: Trophic Ecology Of D Gahi In Northern-central Chilementioning

confidence: 99%

“…Consistently with the present records, the presence of the polychaete P. gallapagensis has been reported in stomach content of individuals D. gahi from Peru (Cardoso et al, 1998) as well as in other members of the Family Loliginidae (Rocha et al, 1994), whereas amphipods have been recorded in the Atlantic Ocean (Arkhipkin et al, 2013). Therefore, the potential contribution of polychaetes and amphipods in the diet of D. gahi may provide temporal trophic subsidize to juvenile and adult squids in these coastal waters via emergent macrobenthic fauna (see Carrasco et al, 2017).…”

Section: Trophic Ecology Of D Gahi In Northern-central Chilementioning

confidence: 99%

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Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

et al. 2021

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Heterogeneous environmental conditions along the Humboldt Current System (HCS) influence the life-history strategy of a variety of species in different ways. There is limited information on latitudinal traits of coastal cephalopods as part of the interacting species in pelagic and benthic environments. The present study used the loliginid squid Doryteuthis gahi as a model organism to: (1) evaluate latitudinal traits on egg laying patterns, (2) characterize a particular spawning ground, (3) quantify the isotopic variation from different tissues, (4) evaluate potential trophic ontogenetic changes, (5) determinate trophic position, and (6) isotopically estimate the relative importance of putative preys in the squid’s assimilated diet. Results evidenced that egg-masses collected between 2014 and 2020 presented similar patterns along northern-central Chile (27–36°S), with females attaching small egg-capsules (10–50 mm length) through the year and over a variety of anthropogenic and natural substrates. At a small scale (Coquimbo; 29°S), early life history traits showed distinct patterns depending on SST, with warmer collection periods (∼18°C) evidencing larger capsules and smaller embryos, although small paralarvae were obtained over the 4-year sampling period. In this site, sampling of older ontogenetic stages supported the constant presence of small-sized squids (19–77 mm ML). Males had larger mean sizes compared to females and undetermined specimens, with a high proportion of mature stages. Observations in captivity were extended for up to 110 d, validating that small females (45–64 mm ML) spawn the small egg-capsules typically observed in the field. Differences in stable isotope composition between beaks and soft tissues of adult squids were lower for δ13C values (1.1 vs. 1.4‰, respectively) and higher for δ15N values (5.3 vs. 4.7‰, respectively). Isotopic composition through ontogeny found similar δ13C and δ15N values, suggesting that carbon sources (pelagic origin) and trophic position did not change significantly, with copepods, euphausiids and nereid polychaetes being the most important preys. This study unveils the permanent occurrence of a small reproductive morphotype of D. gahi in shallow coastal habitats of northern-central Chile (i.e., center of the distribution range), providing the first insights for understanding the species’ potential adaptations to heterogeneous conditions in the HCS and the unexplored distribution gap between the two centers of abundance (Peru and the Falkland/Malvinas islands).

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Section: Trophic Ecology Of D Gahi In Northern-central Chilementioning

confidence: 99%

Section: Trophic Ecology Of D Gahi In Northern-central Chilementioning

confidence: 99%

Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

et al. 2021

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“…trap intentionally removed from the bottom, and accidental loss of collection container), samples were obtained from only one trap at RCI. The light traps used in this study corresponded to those previously used by Carrasco, Vandecasteele, Rivadeneira, Fernández, and Pérez-Matus (2017) in northern-central Chile. As in those preliminary tests, control traps without light systems were not evaluated; however, deployments in which lights failed to turn on resulted in empty traps, providing evidence of the low attraction capacity of the structure itself.…”

Section: Pelagic Samplingmentioning

confidence: 99%

“…The total number of specimens caught overnight in each light trap (including emerging macrobenthos and early-life stages) was standardized to catch per unit effort (CPUE) as a proxy for species abundance in the water column (Carrasco et al, 2017;Jones, 2006), and defined as individuals collected per hour (ind h −1 ). This was done by dividing the total counts per trap by the total time (in hours) the light traps were sampling (i.e.…”

Section: Pelagic Samplingmentioning

confidence: 99%

Exploring overlooked components of remote South‐east Pacific oceanic islands: Larval and macrobenthic assemblages in reef habitats with distinct underwater soundscapes

Carrasco

Bravo

Avilés

et al. 2020

Aquatic Conservation

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1. Identifying the diverse assemblage of species inhabiting rocky and coral reef habitats in isolated oceanic environments, and the important sound cues emitted from the reef, are crucial components to understand how species locate suitable habitats for the completion of their life-cycle and, thus, the functioning of these vulnerable ecosystems. 2. Recent field information suggests that the majority of reef biodiversity comprises small cryptic invertebrates; however, knowledge on these small components is extremely scarce. 3. The present study used light attraction methods to explore the diversity of larval, post-larval and macrobenthic cryptic fauna, and hydrophones to characterize the natural soundscape of rocky and coral reef habitats at the Robinson Crusoe island (Juan Fernandez Archipelago; 33 38 0 S, 78 50 0 W), and Rapa Nui (Easter Island; 27 7 0 S, 109 21 0 W), respectively. 4. Pelagic collections found important site-specific patterns and identified two main species assemblages: early-life stages (e.g. eggs, larval and juvenile stages of crustaceans, molluscs, and fishes) and emerging macrobenthos (e.g. demersal zooplankton such as peracarid crustaceans, ostracods, copepods, and polychaetes), with the latter contributing between 73 and 98% to the total catches. 5. The soundscape records showed marked differences among sites and seasons at Robinson Crusoe island, with variable differences found between day and night. However, at Rapa Nui, there were no differences between sites, but the ambient sound was higher at night possibly due to higher snapping shrimp activity. 6. This information highlights the importance of considering small-scale (site-to-site) patterns when evaluating overlooked components of diversity (i.e. biological or acoustic) in oceanic habitats, and provides the basis for understanding the importance of natural noise in the settlement of most reef-associated species, crucial features for the conservation of these remote and vulnerable ecosystems.

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“…Previous studies have described several aspects of the biology (Greenfield & Woods, ), trophic ecology (Aguilar‐Medrano et al, ; Angel & Ojeda, ; Fariña et al, ; Pequeño et al, ; Pérez‐Matus et al, ) and reproductive ecology (Navarrete‐Fernández et al, ) of C. crusma , but the early life history, ontogenesis, larval morphology and ecological traits associated with reproduction remain poorly known. Nonetheless, early life stages, particularly yolk‐sac and pre‐flexion larvae, have been collected in nearshore waters in northern and central Chile (Díaz‐Astudillo et al, , ; Landaeta et al, ; Paredes et al, ), with recent light trapping surveys being used to capture postlarvae and juvenile stages of C. crusma (Carrasco et al, ; Díaz‐Astudillo et al, ).…”

Section: Introductionmentioning

confidence: 99%

Embryonic and larval traits of the temperate damselfish Chromis crusma reveal important similarities with other Pomacentridae throughout the family's thermal range

Muñoz-Cordovez

Maza

Pérez‐Matus

et al. 2019

Journal of Fish Biology

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Embryonic development and larval morphology of Chromis crusma was described from five nests sampled between 21 and 25 m depth in central Chile (33°S). From each nest, a set of c. 100 randomly selected eggs were hand‐collected and transported in seawater to the laboratory. Subsets of c. 30 eggs per nest were maintained in 50 ml glass containers at a constant ambient temperature of c. 12°C (range 11.5–12.9°C). Egg length (L) and width (W) and larval notochordal length (LN) were measured from photographs. Geometric morphometric analyses were performed in newly hatched and 1 week old larvae to quantify shape changes. Ellipsoid eggs had an average (mean ± SE) size of 1.12 ± 0.05 mm L and 0.67 ± 0.02 mm W, with volume being similar throughout 15 developmental stages (i.e., ellipsoid‐shaped; 0.27 mm3). Planktonic larvae hatched between 5 and 11 days at 12°C and had a mean LN of 3.13 ± 0.25 mm, a yolk sack volume of 0.03 mm3 and an oil droplet volume of 0.005 mm3. Morphological traits at hatching included: (a) lack of paired fins and jaws; (b) single medial fin fold; (c) lack of eye pigmentation; (d) yolk sac present near anterior tip; (e) melanophores distributed along ventral surface with one pair over the forehead. In order to generate an up‐to‐date summary of developmental traits within Pomacentridae, we reviewed literature on egg development (e.g., shape and number of oil droplets), hatching and larval traits (e.g., morphology, pigmentation patterns). Thirty‐two publications accounting for 35 species were selected, where eggs, embryonic development, hatching and larval traits were found for 26, 21, 24 and 34 species, respectively. In order to evaluate potential phylogenetic and environmental relationships within the early stages of Pomacentridae, cluster analyses (Bray Curtis similarity, group average) were also performed on egg and larval traits of 22 species divided by subfamily (Stegastinae, Chrominae, Abudefdufinae, Pomacentrinae) and thermal ranges (i.e., low: 16.5°C (range: 12–21°C), medium: 24.5°C (range:21–28°C) and high: 27°C (range: 26–28°C)), suggesting that early developmental patterns can be segregated by both temperature and phylogenetic relationships.

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Spatial and short-term variability of larval, post-larval and macrobenthic assemblages associated with subtidal kelp forest ecosystems in Central Chile

Cited by 6 publications

References 56 publications

Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

Exploring overlooked components of remote South‐east Pacific oceanic islands: Larval and macrobenthic assemblages in reef habitats with distinct underwater soundscapes

Embryonic and larval traits of the temperate damselfish Chromis crusma reveal important similarities with other Pomacentridae throughout the family's thermal range

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