A subtropical embayment serves as essential habitat for sub-adults and adults of the critically endangered smalltooth sawfish

Papastamatiou, Yannis P.; Grubbs, R. Dean; Imhoff, Johanna L.; Gulak, Simon J. B.; Carlson, John K.; Burgess, George H.

doi:10.1016/j.gecco.2015.03.003

Cited by 23 publications

(32 citation statements)

References 27 publications

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“…Tagged adults spent the majority of their time at shallow depths (<10 m) and warm water temperatures (22−28°C). In a similar study, Papastamatiou et al (2015) reported that adults rarely occurred in waters warmer than 30°C, although they have occasionally been documented in water 32−34°C (Carlson et al 2014). These data suggest that temperature is a cue for triggering seasonal movements of large juveniles and adults.…”

Section: Large Juveniles and Adultsmentioning

confidence: 72%

“…Encounter data suggest that larger individuals migrate seasonally northward up the US east coast (NMFS 2009a), although early satellite tracking data were not able to confirm such behavior (Carlson et al 2014). Papastamatiou et al (2015) obtained some evidence to support the migration hypothesis, as northward summer movements were observed from 3 individuals, but no data were collected during late fall and winter to observe subsequent southerly movements. The recapture of an adult in 2015 off Cumberland Island, Georgia, which was originally tagged in 2010 in the Florida Keys (NMFS unpubl.…”

Section: Spatial Distributionmentioning

confidence: 99%

“…Limited data are available about site fidelity of large juveniles and adults (but see Section 3.5). Males displayed site fidelity to Florida Bay, as some individuals were recaptured 1−2 yr after originally being tagged, and showed high periods of residency at East Cape Canal with some individuals being detected almost daily over periods of 1−3 mo (Papastamatiou et al 2015). Seitz & Poulakis (2002) reported that 1 adultsized animal with a broken rostrum was recaptured multiple times in the same location during a month near Big Carlos Pass.…”

Section: Large Juveniles and Adultsmentioning

confidence: 99%

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Biology, ecology, and status of the smalltooth sawfish Pristis pectinata in the USA

Brame¹,

Wiley²,

Carlson³

et al. 2019

Endang. Species. Res.

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The smalltooth sawfish Pristis pectinata is threatened with extinction throughout its range and has been designated as Critically Endangered by the IUCN. In the USA, the species historically ranged from Texas to North Carolina, but mortality in fisheries and habitat loss have reduced the range to primarily southwest Florida. The US population was listed as endangered under the US Endangered Species Act in 2003. At that time, data on the biology and ecology of the species were limited. Research and outreach efforts have since expanded, and the quality and quantity of information has increased such that the US population is now one of the most wellstudied sawfish populations worldwide. Smalltooth sawfish are born in litters of 7−14 individuals at lengths of 64−81 cm stretched total length (STL), reach maturity in 7−11 yr at approximately 340 cm STL for males and 370 cm STL for females, grow to a maximum size of about 500 cm STL, and live an estimated 30 yr in the wild. Smalltooth sawfish are piscivorous and shift from shallow estuarine waters as small juveniles to a broader array of coastal habitats as large juveniles and adults. The species is physiologically resilient to anthropogenic stressors, but preserving habitat and reducing fishing effects remain priorities. Data synthesized in this review have advanced our understanding of smalltooth sawfish life history and habitat needs, as well as the threats that continue to affect the population. Cumulatively, these data support optimism for recovery of the smalltooth sawfish in the USA and potentially beyond, though recovery will still require decades.

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Section: Large Juveniles and Adultsmentioning

confidence: 72%

Section: Spatial Distributionmentioning

confidence: 99%

Section: Large Juveniles and Adultsmentioning

confidence: 99%

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Biology, ecology, and status of the smalltooth sawfish Pristis pectinata in the USA

Brame¹,

Wiley²,

Carlson³

et al. 2019

Endang. Species. Res.

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“…To understand seasonality of habitat use for migratory fish of conservation concern, grid sampling may help maximize information gained about the animal (e.g. Papastamatiou et al, 2015). Furthermore, grid sampling provides a more rigorous foundation to evaluate the interconnectedness of receiver locations through application of network analysis (Jacoby, Brooks, Croft, & Sims, 2012).…”

Section: Autonomous Receiver Sampling For Survivalmentioning

confidence: 99%

Evaluation of acoustic telemetry grids for determining aquatic animal movement and survival

et al. 2018

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Acoustic telemetry studies have frequently prioritized linear configurations of hydrophone receivers, such as perpendicular from shorelines or across rivers, to detect the presence of tagged aquatic animals. This approach introduces unknown bias when receivers are stationed for convenience at geographic bottlenecks (e.g. at the mouth of an embayment or between islands) as opposed to deployments following a statistical sampling design. We evaluated two‐dimensional acoustic receiver arrays (grids: receivers spread uniformly across space) as an alternative approach to provide estimates of survival, movement and habitat use. Performance of variably spaced receiver grids (5–25 km spacing) was evaluated by simulating (1) animal tracks as correlated random walks (speed: 0.1–0.9 m/s; turning angle SD: 5–30°); (2) variable tag transmission intervals along each track (nominal delay: 15–300 s); and (3) probability of detection of each transmission based on logistic detection range curves (mid‐point: 200–1,500 m). From simulations, we quantified (i) time between successive detections on any receiver (detection time), (ii) time between successive detections on different receivers (transit time), and (iii) distance between successive detections on different receivers (transit distance). In the most restrictive detection range scenario (200 m), the 95th percentile of transit time was 3.2 days at 5 km, 5.7 days at 7 km and 15.2 days at 25 km grid spacing; for the 1,500 m detection range scenario, it was 0.1 days at 5 km, 0.5 days at 7 km and 10.8 days at 25 km. These values represented upper bounds on the expected maximum time that an animal could go undetected. Comparison of the simulations with pilot studies on three fishes (walleye Sander vitreus, common carp Cyprinus carpio and channel catfish Ictalurus punctatus) from two independent large lake ecosystems (lakes Erie and Winnipeg) revealed shorter detection and transit times than what simulations predicted. By spreading effort uniformly across space, grids can improve understanding of fish migration over the commonly employed receiver line approach, but at increased time cost for maintaining grids.

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“…Sawfish habitats in the western Atlantic are well documented (e.g. Papastamatiou et al, 2015;Seitz & Poulakis, 2002), and tagging studies have given further insights into sawfish ecology (e.g. Carlson et al, 2014;Guttridge et al, 2015;Simpfendorfer, Wiley, & Yeiser, 2010).…”

mentioning

confidence: 99%

Smalltooth sawfish (Pristis pectinata Latham, 1794) in the Casamance River, Senegal: A historical perspective

Downing

Leeney

2018

Aquatic Conservation

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A study of euryhaline elasmobranchs was conducted in the Casamance River, southern Senegal, between June 1974 and October 1975. Data were collected from 159 sawfish, comprising 158 smalltooth sawfish (Pristis pectinata Latham, 1794) and one largetooth sawfish (Pristis pristis Linnaeus, 1758). The mean total rostral tooth count for P. pectinata was 46 (range 41–53), significantly lower than the total tooth counts for the western Atlantic population. No sexual dimorphism in rostral tooth counts was apparent, in contrast to findings from the western Atlantic. The total rostral length averaged 22.9% of the total length. One hundred and forty‐four individuals were caught within the river system itself, all of them were juveniles. Fifteen adults, including the single largetooth sawfish documented during the study, were caught at the river mouth or at sea. Six sawfish, caught between May and July, bore rostral sheaths, indicating that they had recently been born. Although the Casamance and Gambia rivers are only 120 km apart, the findings from this study combined with published data collected from the Gambia River during the same period suggest the partitioning of juvenile habitats by the two sawfish species present in the region, to the level of different river systems. Both species are likely to have used the same coastal habitats as adults. The Casamance River was clearly an important habitat for smalltooth sawfish some 40 years ago, but it is unknown whether the species persists there. Intensive artisanal fisheries for sharks and rays in the region poses a significant threat to any remaining sawfishes, and a challenge for elasmobranch fisheries management.

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A subtropical embayment serves as essential habitat for sub-adults and adults of the critically endangered smalltooth sawfish

Abstract: 2016-11-02T18:49:00

Cited by 23 publications

References 27 publications

Biology, ecology, and status of the smalltooth sawfish Pristis pectinata in the USA

Biology, ecology, and status of the smalltooth sawfish Pristis pectinata in the USA

Evaluation of acoustic telemetry grids for determining aquatic animal movement and survival

Smalltooth sawfish (Pristis pectinata Latham, 1794) in the Casamance River, Senegal: A historical perspective

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