Estimating the complex patterns of survey availability for loggerhead turtles

Hatch, Joshua M.; Haas, Heather L.; Sasso, Christopher R.; Patel, Samir H.; Smolowitz, Ronald J.

doi:10.1002/jwmg.22208

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Estimating the complex patterns of survey availability for loggerhead turtles

2022
By Hatch, Joshua M. ; Haas, Heather L. ; Sasso, Christopher R. ; ...
Source: Journal of Wildlife Management 86:e22208

[PDF-3.00 MB]

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Details:

Journal Title:

The Journal of Wildlife Management
Personal Author:

Hatch, Joshua M. ; Haas, Heather L. ; Sasso, Christopher R. ; Patel, Samir H. ; Smolowitz, Ronald J.

Hatch, Joshua M. ; Haas, Heather L. ; Sasso, Christopher R. ; Patel, Samir H. ; Smolowitz, Ronald J. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) ; SEFSC (Southeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) ; SEFSC (Southeast Fisheries Science Center) Less -
Description:

Successful management strategies are important for conservation and allow accurate surveying and monitoring of populations for presence, abundance, and trend. This becomes challenging for cryptic, low-density species, and for animals that have complicated life histories where not every stage of the life cycle can be surveyed effectively. We used information from animal-borne data loggers to characterize the dive-surfacing behavior of cryptic loggerhead turtles (Caretta caretta) in the northwest Atlantic from 2009–2018. Our data covered a large geographic area off the east coast of North America, and allowed us to present estimates for and variation in 3 metrics that can be used to assess availability bias affecting visual surveys: average dive duration, average surface duration, and the proportion of time at the surface. We used a stochastic partial differential equation approach to construct spatiotemporal regression models for the availability bias metrics. Model predictions showed pronounced individual, spatial, and spatiotemporal (seasonal) variation among the 245 turtles. Overall, we estimated an average dive duration of 14.5 ± 1.36 minutes (SE), an average surface duration of 15.1 ± 2.77 minutes, and an average proportion of time at the surface of 0.50 (95% CI = 0.41–0.59). We made predictions of the 3 availability bias metrics on a 20-km × 20-km grid and further used predictions to explore seasonal variations. Our results contribute new insights into loggerhead turtle behavior and provide information that enables survey counts to be translated into more accurate abundance estimates.
Keywords:

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Animal Behavior Loggerhead Turtle Availability Bias Behavior Caretta Caretta Ecology Ecology, Evolution, Behavior And Systematics Loggerhead Turtles Nature And Landscape Conservation Northwest Atlantic Spatiotemporal Regression
Source:

Journal of Wildlife Management 86:e22208
DOI:

https://doi.org/10.1002/jwmg.22208
Document Type:

Journal Article
Funding:

M14PG00005 ; M10PG00075 ; M19PG00007

M14PG00005 ; M10PG00075 ; M19PG00007 Less -
Place as Subject:

Atlantic Ocean
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:6f19a15e3a93588bd1cf5c19bc5b53b06a0a2a3dde6f8282c5786f45041d9f5a
Download URL:

https://repository.library.noaa.gov/view/noaa/43771/noaa_43771_DS1.pdf
File Type:

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