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  1. Article: Native and non-native fish predators differ in their consumptive and non-consumptive impacts on a native freshwater snail

    Siegfried, Tabitha R. / Gutierre, Silvia M. M. / Piacenza, Susan E. / Darby, Philip C.

    Aquatic ecology. 2022 Sept., v. 56, no. 3

    2022  

    Abstract: Florida apple snails, Pomacea paludosa, serve as the nearly exclusive prey for the endangered Florida snail kite, Rostrhamus sociabilis, and many other predators in Florida wetlands. As the Florida Everglades is a hotspot for non-native species, it is ... ...

    Abstract Florida apple snails, Pomacea paludosa, serve as the nearly exclusive prey for the endangered Florida snail kite, Rostrhamus sociabilis, and many other predators in Florida wetlands. As the Florida Everglades is a hotspot for non-native species, it is prudent to understand the potential impacts non-native predators have on apple snails. In an aquarium setting, we recorded and documented the interactions between the non-native jewelfish, Hemichromis letourneuxi, and native apple snails. We compared these interactions to those recorded between apple snails and redear sunfish, Lepomis microlophus, a native predator. We found that sunfish successfully ate more snails. However, jewelfish attacked apple snails more frequently (n = 314) compared to sunfish (n = 68), resulting in apple snails withdrawing into their shells and displaying longer recovery times from attacks. Apple snails appear to spend more time recovering from attacks or possibly avoiding predation risk, rather than conducting normal movements, in the presence of the jewelfish. This may have impacts on apple snail behavioral ecology, physiology, and demography, potentially reducing prey availability for the endangered snail kite and other predators. Our research provides evidence that jewelfish negatively impact a critically important prey species in Florida wetland food webs.
    Keywords Hemichromis ; Lepomis ; Pomacea paludosa ; apples ; demography ; fish ; freshwater ; introduced species ; physiology ; predation ; prey species ; risk ; snails ; wetlands ; Florida
    Language English
    Dates of publication 2022-09
    Size p. 865-876.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1411979-1
    ISSN 1573-5125 ; 1386-2588
    ISSN (online) 1573-5125
    ISSN 1386-2588
    DOI 10.1007/s10452-022-09944-y
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Design and fabrication of a stereo-video camera equipped unoccupied aerial vehicle for measuring sea turtles, sharks, and other marine fauna.

    Piacenza, Susan E H / Piacenza, Joseph R / Faller, Kenneth J / Robinson, Nathan J / Siegfried, Tabitha R

    PloS one

    2022  Volume 17, Issue 10, Page(s) e0276382

    Abstract: The recent commercialization of unoccupied aerial vehicles (UAVs) has facilitated their incorporation into a variety of ecological studies. While UAVs are able to provide accurate visual data of marine species from an aerial perspective, these devices ... ...

    Abstract The recent commercialization of unoccupied aerial vehicles (UAVs) has facilitated their incorporation into a variety of ecological studies. While UAVs are able to provide accurate visual data of marine species from an aerial perspective, these devices have some limitations that make measuring marine animals below the surface challenging. Many marine organisms are often visible from the air, but are deeper in the water column, and current methods cannot measure animals below the surface. Here, we developed and tested a stereo-video camera (SVC) system that was mounted onto a commercially-available UAV. We used the SVC-UAV to conduct remote body-size measurements for two marine species: the green sea turtle (Chelonia mydas) and the nurse shark (Ginglymostoma cirratum). When comparing SVC measurements to those taken by hand, the SVC-UAV had a mean absolute error (MAE) of 4.44 cm (n = 6; mean percent error (MPE) = 10.6%) for green sea turtles and 7.16 cm absolute error (n = 1; PE = 3.6%) for the nurse shark. Using a linear model, we estimated the slope of the SVC versus hand measurements for green sea turtles to be 1.085 (±0.099 SE), and accounting for the standard error, a measurement bias was not apparent. Using model selection, based on a global model predicting MAE from animal distance to the SVC and body size, the top ranked model was the intercept-only model. This indicates that neither animal distance nor body size strongly influenced measurement error. Incorporating SVC systems into UAVs can allow for relatively accurate measurements of near surface-dwelling marine species. To our knowledge, there is no other stand-alone SVC for UAVs available that offers similar accuracy and utility.
    MeSH term(s) Animals ; Turtles ; Sharks ; Aquatic Organisms ; Water
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2022-10-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0276382
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Validating the use of stereo-video cameras to conduct remote measurements of sea turtles.

    Siegfried, Tabitha R / Fuentes, Mariana M P B / Ware, Matthew / Robinson, Nathan J / Roberto, Emma / Piacenza, Joseph R / Piacenza, Susan E

    Ecology and evolution

    2021  Volume 11, Issue 12, Page(s) 8226–8237

    Abstract: Point 1: Stereo-video camera systems (SVCSs) are a promising tool to remotely measure body size of wild animals without the need for animal handling. Here, we assessed the accuracy of SVCSs for measuring straight carapace length (SCL) of sea turtles. ... ...

    Abstract Point 1: Stereo-video camera systems (SVCSs) are a promising tool to remotely measure body size of wild animals without the need for animal handling. Here, we assessed the accuracy of SVCSs for measuring straight carapace length (SCL) of sea turtles. Point 2: To achieve this, we hand captured and measured 63 juvenile, subadult, and adult sea turtles across three species: greens,
    Language English
    Publishing date 2021-05-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 2635675-2
    ISSN 2045-7758
    ISSN 2045-7758
    DOI 10.1002/ece3.7653
    Database MEDical Literature Analysis and Retrieval System OnLINE

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