Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

Rueda, Lucía; Massutı́, Enric; Alvarez-Berastegui, Diego; Hidalgo, Manuel

doi:10.1890/es15-00087.1

Cited by 22 publications

(20 citation statements)

References 67 publications

(81 reference statements)

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“…live corals), despite the loss of nutritional value (Shraim et al 2017). On the contrary, we did not observe any correlation between changes in primary productivity and changes in feeding activity, suggesting that shifts in diet may not be related to primary productivity (measured as chlorophyll-a concentration) (Rueda et al 2015; Zhou et al 2016) but the result of temperature-related differences in food preference (Shraim et al 2017). Ultimately, we would need manipulative experiments to confirm the potential for predators or other drivers to produce similar behavioural changes to those seen in our temperature manipulation.…”

Section: Discussioncontrasting

confidence: 78%

The influence of thermal extremes on coral reef fish behaviour in the Persian Gulf

D’Agostino¹,

Burt

Reader³

et al. 2019

Preprint

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Despite increasing environmental variability within marine ecosystems, little is known about how coral reef fish species will cope with future climate scenarios. The Arabian/Persian Gulf is an extreme environment, providing an opportunity to study fish behaviour on reefs with seasonal temperature ranges which include both values above the mortality threshold of Indo-Pacific reef fish, and values below the optimum temperature for growth. Summer temperatures in the Gulf are comparable to those predicted for the tropical ocean by 2090-2099. Using field observations in winter, spring and summer, and laboratory experiments, we examined the foraging activity, distance from refugia and resting time of Pomacentrus trichrourus (pale-tail damselfish). Observations of fish behaviour in natural conditions showed that individuals substantially reduced distance from refugia and feeding rate and increased resting time at sub-optimal environmental temperatures in winter (average SST = 21°C) and summer (average SST = 34°C), while showing high movement and feeding activity in spring (average SST= 27°C). Diet was dominated by plankton in winter and spring, while fish used both plankton and benthic trophic resources in summer. These findings were corroborated under laboratory conditions: in a replicated aquarium experiment, time away from refugia and activity were significantly higher at 28°C (i.e., spring temperature conditions) compared to 21 °C (i.e., winter temperature conditions). Our findings suggest that P. trichrourus may have adapted to the Arabian/Persian Gulf environment by downregulating costly activity during winter and summer and upregulating activity and increasing energy stores in spring. Such adaptive behavioural plasticity may be an important factor in the persistence of populations within increasing environmentally variable coral reef ecosystems.

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Section: Discussioncontrasting

confidence: 78%

The influence of thermal extremes on coral reef fish behaviour in the Persian Gulf

D’Agostino¹,

Burt

Reader³

et al. 2019

Preprint

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“…A similar effect was observed in age 0 year T. chalcogramma in the eastern Bering Sea, where productivity in the pelagic environment as well as consumption of euphausiids was suggested to favour condition during summer (Moss et al ., ). Chlorophyll a concentration also played a key role in determining body condition of gadoids in the Balearic Islands (Rueda et al ., ). In the southern extreme of the gulf, under the influence of the South Patagonian Frontal System, a similar process might be occurring.…”

Section: Discussionmentioning

confidence: 98%

“…(2008) compared recruit condition in two locations with different oceanographic conditions, attributing the observed patterns to differential productivity of water masses. The identification of spatial patterns is of essential interest, because local effects of environmental drivers on fish condition that might be considered for assessment and management (Rueda et al ., ) could be ignored when searching for general responses at large scales. In this sense, and considering the key role that age 0+ year individuals play in M. hubbsi fisheries recruitment in the ACS, studies linking their condition with the environment are essential to understanding the influence of bottom‐up factors on the recruitment levels of the species and should continue in the future.…”

Section: Discussionmentioning

confidence: 99%

“…In M. merluccius from the Balearic Islands, Hidalgo et al (2008) compared recruit condition in two locations with different oceanographic conditions, attributing the observed patterns to differential productivity of water masses. The identification of spatial patterns is of essential interest, because local effects of environmental drivers on fish condition that might be considered for assessment and management (Rueda et al, 2015) could be ignored when searching for general responses at large scales. In this sense, and considering the key role that age 0+ Following the "ideal free distribution" hypothesis (Fretwell & Lucas, 1970), age 0+ year M. hubbsi should have distributed within the San Jorge Gulf in a way that equalizes feeding incidence, resulting in spatially-uniform condition, but results indicate otherwise.…”

Section: Spatial Changes In Conditionmentioning

confidence: 99%

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Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Temperoni

Massa

Derisio

et al. 2018

Journal of Fish Biology

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This study examined the southern or Patagonian (41°–55° S) stock of Argentine hake Merluccius hubbsi, the more abundant of the two stocks on the Argentinean continental shelf. Pre‐recruits (age 0+ year individuals) of this stock settle and grow in the San Jorge Gulf (45°–47° S, 65° 30′ W), a complex habitat with large spatial variability in environmental features. Relative condition factor, hepatosomatic index, lipid content and fatty‐acid composition of muscle and liver, and diet information were combined with physical and biological data to evaluate: how nutritional status of age 0+ year hake varies spatially within the nursery ground; whether changes in condition are related to environmental factors and feeding; whether the indices are interchangeable metrics of condition. Both morphometric and biochemical indices showed dissimilar spatial trends; enhanced liver‐based condition coincided with low salinity nutrient rich waters, higher chlorophyll‐a values and abundances of Euphausia spp., the preferred prey at most stations, suggesting a bottom‐up effect on age 0+ year hake condition. Diminished condition at stations where Thermisto gaudichaudii was the main prey could derive from lower prey quality in terms of energy density and essential fatty acids content. Coastal waters of the gulf would be essential habitats for M. hubbsi pre‐recruits. Future monitoring of condition with liver‐based indices is encouraged in the gulf, where interannual increasing trends of satellite‐derived chlorophyll‐a values have been observed, which could have implications for recruitment of the species.

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“…Finally, we used publicly available remotely-sensed chlorophyll a data as a proxy for primary productivity. The SeaWiFS and MODIS Ocean Color datasets (Hu et al 2012, NASA Goddard Space Flight Center 1997-2010, 2003 are frequently used as an indicator of primary productivity in the literature (Witman et al 2008, Lander et al 2009, Wood et al 2015, Rueda et al 2015. In addition, in this region, there are no other publicly available sources for ocean productivity data.…”

Section: Datamentioning

confidence: 99%

Spatial community structure of groundfish is conserved across the Gulf of Alaska

Blake¹,

Ward²,

Hunsicker³

et al. 2019

Mar. Ecol. Prog. Ser.

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The mechanisms structuring patterns of diversity and community composition can be difficult to identify in large, open ecological systems. However, it is important to understand what drives these patterns at larger scales, especially in the face of climate change and other perturbations. The Gulf of Alaska (GOA) is an ideal study system because it has complex topography, climate-driven variability, and an ongoing groundfish community survey. We used groundfish community data to examine the ecological theory underlying spatial diversity and community composition across 10 study areas in the GOA. We created geostatistically modeled groundfish abundance and biomass from the Alaska Fisheries Science Center trawl survey data (1984 to 2015) to address inherent errors in trawl observations. We found that species richness and alpha, beta, and functional diversity varied little both within and between study areas. However, turnover in community composition was significant along a longitudinal gradient, with differences driven by lower-abundance species. Fishing pressure had non-linear effects only on species richness and local diversity, while productivity was linearly related to beta diversity. We conclude that spatial patterns of diversity were not driven by disturbance, but were largely driven by environmental heterogeneity, because of the longitudinal turnover in community composition and high beta diversity (and thus low saturation). In addition, the invariant functional diversity but varying community composition together indicate functional redundancy in this ecosystem. Finally, the spatially invariant alpha and functional diversity show that the underlying community structure of the GOA groundfish community was conserved across this large marine ecosystem.

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Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

Cited by 22 publications

References 67 publications

The influence of thermal extremes on coral reef fish behaviour in the Persian Gulf

The influence of thermal extremes on coral reef fish behaviour in the Persian Gulf

Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Spatial community structure of groundfish is conserved across the Gulf of Alaska

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