Improving conservation planning for an endangered sawfish using data from acoustic telemetry

Simpfendorfer, Colin A.; Wiley, Tonya R.; Yeiser, Beau G.

doi:10.1016/j.biocon.2010.03.021

Cited by 101 publications

(107 citation statements)

References 13 publications

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“…Juvenile smalltooth sawfish spend the majority of their time in waters less than 13 ft (4 m) in depth and are seldom found in depths greater than 32 ft (10 m; [Poulakis and Seitz 2004]). Simpfendorfer et al (2010) also indicated developmental differences in habitat use: the smallest juveniles (young-of-the-year juveniles measuring <100 cm in length) generally used water depths less than 0.5 m (1.64 ft), had small home ranges (4,264 to 4,557 sq m), and exhibited high levels of site fidelity. Although small juveniles exhibit high levels of site fidelity for specific nursery habitats for periods of time lasting up to three months , they do undergo small movements coinciding with changing tidal stages.…”

Section: Life History Informationmentioning

confidence: 99%

Kemp's Ridley Sea Turtle Saga and Setback: Novel Analyses of Cumulative Hatchlings Released and Time-Lagged Annual Nests in Tamaulipas, Mexico

Caillouet¹,

Gallaway

Putman

2016

Chelonian Conservation and Biology

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Section: Life History Informationmentioning

confidence: 99%

Kemp's Ridley Sea Turtle Saga and Setback: Novel Analyses of Cumulative Hatchlings Released and Time-Lagged Annual Nests in Tamaulipas, Mexico

Caillouet¹,

Gallaway

Putman

2016

Chelonian Conservation and Biology

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“…nursery areas) that are critical to conservation efforts (e.g. Simpfendorfer et al 2010, Morgan et al 2015, this information is still largely lacking for vast areas of the developing world. Very little is known about the spatial ecology of guitarfishes to inform conservation, and what is known is largely limited to the developed world (Farrugia et al 2011, White et al 2014b.…”

Section: Discussionmentioning

confidence: 99%

Are guitarfishes the next sawfishes? Extinction risk and an urgent call for conservation action

Moore¹

2017

Endang. Species. Res.

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Focusing on the most critical conservation priorities to prevent extinctions risks missing declines of lower priority taxa that may become tomorrow's emergency. Sawfishes (5 species) underwent catastrophic but largely unnoticed global declines in the latter part of the 20th century, and are now the subject of intensive research and conservation efforts. Guitarfishes (at least 55 species) share many characteristics with sawfishes: they are shark-like batoids with an often large body, prefer sedimentary habitats in warm shallow coastal waters exposed to intensive fisheries, and have high value fins and good quality meat. Guitarfishes represent a unique element of evolution and biodiversity and are vital components of complex coastal socio-ecological systems. Existing global IUCN Red List of Threatened Species assessments for nearly 60% of guitarfish species are 10 or more years old, and over 70% of species are either in threatened categories or Data Deficient. Recently described taxa not yet assessed include those likely to be at risk of extinction. Severe declines and localised extinctions have already been reported for guitarfishes. In notable contrast to sawfishes, total extinction of several guitarfish species is plausible given small distributions occurring solely in developing or least developed countries where conservation is highly challenging. Furthermore, species identification of guitarfishes is often problematic and they may lack the appeal often needed to promote conservation. To ensure that they do not follow the same trajectory as sawfishes, there is an urgent need for comprehensive and coordinated action on guitarfishes, which in many cases could integrate with sawfish conservation efforts.

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“…Within these nurseries, multiple lines of evidence gathered over almost a decade have documented specific areas of high use, or nursery hotspots, for juvenile smalltooth sawfish (Simpfendorfer et al 2010, 2013, 2016, Nagelkerken et al 2015, Hollensead et al 2016). The present study, which was as comprehensive as previous work in the Caloosahatchee River nursery, included a random-sampling approach, an acoustic monitoring array, and broad sampling coverage of northern Charlotte Harbor, including the Peace River, and still concluded that juvenile sawfish occurred almost exclusively in the Harborview-Protected Cove nursery hotspot, making it the only known nursery hot spot in the northern portion of the Charlotte Harbor Estuary Unit of juvenile critical habitat.…”

Section: Spatial Considerations Within the Nursery: The Importance Ofmentioning

confidence: 99%

“…Hotspots of animal relative abundance identify the core areas of habitat mosaics (Nagelkerken et al 2015), and for juvenile smalltooth sawfish, the presence of nursery hotspots has become increasingly well documented in multiple nurseries throughout their range (Simpfendorfer et al 2010, 2013, 2016, Hollensead et al 2016, Huston et al 2017. These nursery hotspots are emerging as areas of special conservation concern, especially because of recently documented parturition site-fidelity (philopatry) to individual nur series (Feldheim et al 2017).…”

Section: River Management Within Critical Habitatmentioning

confidence: 99%

All nurseries are not created equal: large-scale habitat use patterns in two smalltooth sawfish nurseries

Scharer¹,

Stevens²,

Shea³

et al. 2017

Endang. Species. Res.

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Smalltooth sawfish Pristis pectinata use southwest Florida nurseries during at least their first 2 to 3 yr, and understanding region-specific habitat use patterns is important for effective management. Research occurred in 2 nurseries within the Charlotte Harbor estuarine system: the Caloosahatchee River, a highly human-altered nursery, and a more natural nursery, the Peace River. Between 2010 and 2013, a total of 148 juveniles ranging from 70.8 to 218.7 cm stretch total length were caught in gill nets, and 133 were acoustically tagged. The probability of encountering a sawfish during sampling was most influenced by season in both nurseries (highest during spring and summer), followed by dissolved oxygen in the Caloosahatchee River, and salinity and temperature in the Peace River. Temperature had lasting, atypical effects on movements when severe cold events occurred during the study. Outside of these disturbances, sawfish used all habitats available to them in both nurseries, but tended to reside in perennial high-use areas called nursery hotspots. Acoustic monitoring showed that juveniles gradually moved between 4 hotspots along a 20 river kilometer stretch of the Caloosahatchee River with seasonal changes in freshwater inflows or sometimes suddenly in response to large flow events. In contrast, sawfish in the Peace River remained associated with one nursery hotspot year-round. Reasons for these inter-nursery variations are attributed to differences in geomorphology and freshwater inflow regimes. This study illustrates that a full understanding of the life history of a species and the development of a conceptual model requires investigation of the species on a broad spatial scale. This consideration is important to avoid overgeneralization of habitat use patterns between nurseries.

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Improving conservation planning for an endangered sawfish using data from acoustic telemetry

Cited by 101 publications

References 13 publications

Kemp's Ridley Sea Turtle Saga and Setback: Novel Analyses of Cumulative Hatchlings Released and Time-Lagged Annual Nests in Tamaulipas, Mexico

Kemp's Ridley Sea Turtle Saga and Setback: Novel Analyses of Cumulative Hatchlings Released and Time-Lagged Annual Nests in Tamaulipas, Mexico

Are guitarfishes the next sawfishes? Extinction risk and an urgent call for conservation action

All nurseries are not created equal: large-scale habitat use patterns in two smalltooth sawfish nurseries

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