Niche Partitioning Among Snook (Pisces: Centropomidae) in Rivers of Southeastern Florida and Implications for Species Range Limits

Stevens, Philip W.; Dutka‐Gianelli, Jynessa; Nagid, Eric J.; Trotter, Alexis A.; Johnson, Kevin G.; Tuten, Travis; Whittington, James A.

doi:10.1007/s12237-019-00650-x

Cited by 16 publications

(21 citation statements)

References 46 publications

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“…It is unclear whether the mangrove expansion northward is a mechanism for snook expansion, but clearly the habitats are shifting from salt marsh to mangroves in this region [8,14], which will further improve habitat for snook. Snook commonly use mangrove habitat in southern estuaries, however are habitat generalists and use habitats in proportion to their relative availability [51]. Therefore, we predict as mangroves expand northward, snook are likely to utilize those habitats.…”

Section: Plos Onementioning

confidence: 92%

Poleward expansion of common snook Centropomus undecimalis in the northeastern Gulf of Mexico and future research needs

2020

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Globally, rising temperatures have resulted in numerous examples of poleward shifts in species distribution patterns with accompanying changes in community structure and ecosystem processes. In the Gulf of Mexico, higher mean temperatures and less frequent winter freezes have led to the expansion of tropics-associated marine organisms. Our objectives were to quantify changing environmental conditions and the poleward expansion of the common snook Centropomus undecimalis into the Cedar Keys area of Florida, USA (29 deg N). The snook is an economically and recreationally important sport fish found from southern Brazil to south Florida. Cedar Key and the Lower Suwannee River are north of the snook's historically documented range, likely due to lethal water temperatures during winter. Using data from a long-term monitoring program, we report an increase in catches of snook in this area since 2007. The spatial and temporal expansion of the species began with adult fish in 2007. By 2018, snook of all sizes were found in the region, and we found strong evidence of local reproduction during 2016-2018. The locations of nursery habitat and winter thermal refuges (e.g., freshwater springs) need to be identified and have implications for land-use policy and minimum-flow regulations for rivers. The arrival of the snook in the northern Gulf of Mexico could affect food web ecology and habitat interactions among estuarine predators, and future studies should evaluate snook's food habits and competitive interactions with resident fishes in this expanded range. Our study provides an example of how species range expansions due to changing temperatures should result in new research priorities to evaluate impacts of climate change on coastal systems.

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Section: Plos Onementioning

confidence: 92%

Poleward expansion of common snook Centropomus undecimalis in the northeastern Gulf of Mexico and future research needs

2020

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“…This information reveals the main species available at a certain time of the year, and indicates which preys are used as energy source for e.g. reproduction and growth (Gonzalez et al, 2019;Stevens et al, 2019). Knowing a diet's composition and seasonal variations in the fish stomach improve knowledge of about a species' feeding behavior, such as tendencies to specialization and generalization (Bennemann et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Landings from shrimp trawlers and freshwater prawn traps were mainly observed between January and April in delta of Parnaíba throughout the rainy season (Farias et al, 2015;Fernandes & Cunha, 2017). C. undecimalis is a diadromous species with wide-range habitat selection that tolerates high salinity variations, which increases the chance of finding different preys throughout the year (Stevens et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

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Feeding habits of Centropomus undecimalis (Actinopterygii, Centropomidae) in the Parnaíba river delta, Piauí, Brazil / Alimentação do Centropomus undecimalis (Actinopterygii, Centropomidae) no estuário do delta do rio Parnaíba, Piauí, Brasil

Fonseca¹,

Fernandes²,

Cunha³

2021

BJDV

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The objective of this work was to evaluate the feeding of Centropomus undecimalis in the estuary of the Parnaíba river delta, with emphasis on diet composition during seasonal variations between dry and rainy seasons. The samples were obtained from artisanal fishing with gillnets, from June 2014 -July 2015. The individuals were measured, weighed and dissected to remove the stomachs. The fish diet was analyzed using the methods: Gravimetric, Frequency of Occurrence, Dominance of the item and Food Index. One hundred and seven stomachs were sampled, of which 72% had food content. The diet consisted of eight Teleostei fish and crustaceans during the dry and rainy seasons, as well as organic material of remains, sediments and plastic. Similarities were observed in stomach contents, indicating specialization, but at individual scale (inter-phenotypic). Thus, it may not occur for the entire population. The analyses of the diet allowed to confirm that C. undecimalis is a carnivorous species for the food chain of the estuary of the Parnaíba River delta, and the diet varies according to prey abundance in the environment.

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“…Modifications in the site FISH selection process were implemented to include upriver freshwater habitats in each river system and to add a randomly assigned direction (N, E, S or W) from the starting point of the transect (Dutka-Gianelli et al, 2011). Gear type and sampling protocol have been described (Stevens et al, 2020). C. undecimalis were sorted into two size classes based on standard length (L S ): 300-500 and >500 mm.…”

Section: Methodsmentioning

confidence: 99%

Maturation of female common snook Centropomus undecimalis: implications for managing protandrous fishes

Young

Yeiser

Whittington

et al. 2020

Journal of Fish Biology

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The assumption for hermaphroditic fish species that mature individuals of the terminal sex arise directly from mature individuals of the primary sex has led to the use of sex ratios as a proxy for age at maturity (A 50). The timing of transition and deficient energy reserves, however, can result in a delay between transition and spawning. To test the assumption of female maturity and investigate the relationship between maturation and energy reserves, common snook, Centropomus undecimalis, a protandrous hermaphrodite, were collected from rivers, estuaries, inlets and offshore habitats on the east coast of Florida during 2010-2015. Immature females were observed every month, with lowest proportions during the peak spawning months of July and August. When calculated based on sex ratio, A 50 (8.1 years) overestimated the age at which 50% of the female population was, in fact, mature (4.1-4.9 years). Best-fit models indicate that mesenteric fat index (I F) and hepato-somatic index (I H) were significantly affected by gonad phase, month and size and weakly by habitat. In post hoc analysis, immature female I F did not differ significantly from developing and regenerating females, but immature female I H was significantly lower than that for all mature phases except animals in the regressing phase. Although immature females may have sufficient energy in terms of fat, it appears that energy is not allocated to reproductive processes, as evidenced by lower I H. Nonetheless, approximately 95% of females were spawning-capable during peak spawning months, suggesting that the energy threshold at which immature females reach maturity is met by most females each spawning cycle.

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Niche Partitioning Among Snook (Pisces: Centropomidae) in Rivers of Southeastern Florida and Implications for Species Range Limits

Cited by 16 publications

References 46 publications

Poleward expansion of common snook Centropomus undecimalis in the northeastern Gulf of Mexico and future research needs

Poleward expansion of common snook Centropomus undecimalis in the northeastern Gulf of Mexico and future research needs

Feeding habits of Centropomus undecimalis (Actinopterygii, Centropomidae) in the Parnaíba river delta, Piauí, Brazil / Alimentação do Centropomus undecimalis (Actinopterygii, Centropomidae) no estuário do delta do rio Parnaíba, Piauí, Brasil

Maturation of female common snook Centropomus undecimalis: implications for managing protandrous fishes

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