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Fig. 15 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 15. Carapace length (SCLmin), weight, and maturity status for 56 Chelonia mydas captured at Secretary, Panama, (1989–1997). For explanation of stages of maturity status, see Methods. Minimum adult size, indicated by the dashed line, is based on laparoscopy of 178 C. mydas in Bocas del Toro, Panama, and size criteria developed from laparoscopy data (this study; Meylan and Meylan, unpubl. data).

Fig. 14 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 14. Size distribution of all Chelonia mydas captured (A) at Secretary, Chiriqui Lagoon, Panama, 1989–1997, and (B) immature C. mydas captured at the Zapatilla Cays, Panama, 1990– 2005. C, Size at last capture versus time in years to foreign recapture of 26 C. mydas captured at these site (y 5 22.830x + 233.75, r 2 5 0.4996, P,0.001 Minimum adult size, indicated by the dashed line, is based on laparoscopy of 178 C. mydas in Bocas del Toro, Panama, and size criteria developed from laparoscopy data (this study; Meylan and Meylan, unpubl. data).

Fig. 13 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 13. Size distribution of Eretmochelys imbricata from Bermuda. A, Individuals captured alive by scuba, snorkeling, or in the entrapment net (1970–2005). B, Stranded individuals that were dead, injured, sick, or trapped in marine debris (1980–2005).

Fig. 3 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 3. Study site at Secretary, Chiriqui Lagoon, Ngöbe-Buglé Comarca, Panama. Set nets were deployed on all labeled banks.

Fig. 9 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 9. The time in years from first capture to last recapture for 609 Chelonia mydas recaptured in Bermuda waters through August 2005. Time elapsed was calculated as number of months divided by 12, rounded to nearest year.

Fig. 2 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 2. The islands of Bermuda and the adjacent Bermuda Platform. Labeled sites indicate localities that were regularly sampled with an entrapment net by the Bermuda Turtle Project between 1990 and 2005.

Fig. 1 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 1. Life stage model of Chelonia mydas redrawn from Carr et al. (1978: fig. 2). Terminology for the two earliest stages has been updated.

Fig. 12 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 12. Satellite transmission history of a large subadult (78.6 cm SCLmin) Chelonia mydas from Bermuda. Argos locations displayed are the highest location class per day, selected from the hybrid output of the Douglas Argos filter algorithm. This output includes points passing the minimum redundant distance filter supplemented with points passing the distance angle rate filter during periods of migration.

Fig. 5 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 5. Size composition of Chelonia mydas in Bermuda. A, All turtles captured with an entrapment net from 1968–2005 (excludes recaptures). B, A subsample of C. mydas from Bermuda for which sex and maturity status were determined using laparoscopy; all animals were immature. C, Size distribution of 141 C. mydas that stranded in Bermuda between 1992 and 2005. D, Size (SCLmin) at last capture versus time in years to foreign recapture of 53 C. mydas tagged in Bermuda. Minimum adult size, indicated by the dashed line, is based on laparoscopy of 178 C. mydas in Bocas del Toro, Panama (this study; Meylan and Meylan, unpubl. data).

Fig. 11 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 11. Geographic distribution of 88 foreign tag returns (numbers in circles) through 2005 of Chelonia mydas originally tagged in Bermuda. The star indicates the only known nesting by a C. mydas tagged in Bermuda. This turtle was tagged in November 1992 and nested near Cancun, Mexico, during the summer of 2006.

Fig. 4 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 4. Study site at Zapatilla Cays, Bocas del Toro Province, Panama. Solid circles indicate sites sampled with nets between 1990 and 2005. Point O' Reef, Peachy, and Comfort are in the Caribbean Sea and were fished with ''ocean sets.'' All remaining sites are within Chiriqui Lagoon and were fished with standard set nets (see Methods).

Fig. 6 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 6. Carapace length (SCLmin), weight, and maturity status for 131 Chelonia mydas from Bermuda that were examined laparoscopically. Minimum adult size, indicated by the dashed line, is based on laparoscopy of 178 C. mydas in Bocas del Toro, Panama (this study; Meylan and Meylan, unpubl. data). For explanation of stages, see Methods.

Fig. 10 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 10. Satellite transmission histories of four large subadult Chelonia mydas from Bermuda. Argos locations displayed are the minimum redundant distance (MRD) output of the Douglas Argos filter algorithm. This output includes points that have a consecutive or near-consecutive neighbor within 6 km. Adaptive kernel density percent volume contours, calculated from the MRD dataset, are also displayed. A, Locations (n 5 103) and volume contours for PTT 07665 (70.4 cm SCLmin). B, Locations (n 5 103) and volume contours for PTT 11676 (72.0 cm SCLmin). C, Locations (n 5 141) and volume contours for PTT 11677 (71.8 cm SCLmin). D, Locations (n 5 253) and volume contours for PTT 60810 (70.0 cm SCLmin).

Fig. 7 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 7. Average number of Chelonia mydas caught per set of the entrapment net at Bermuda by month. Mean and one standard deviation are shown for all sets from January 1992–August 2005. Sample size above each bar is for the number of sets made during each month.

Fig. 8 in The Ecology And Migrations Of Sea Turtles 8. Tests Of The Developmental Habitat Hypothesis

Fig. 8. The number of Chelonia mydas caught at Bermuda per set of the entrapment net as a function of water temperature. Data shown are for 258 samples from January 1992–August 2005.

publicFeb 2025View details →

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Data from: Evaluating migration hypotheses for the extinct Glyptotherium using Ecological Niche Modeling

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opencc-zeroFeb 2020View details →

Comparative migration ecology of striped bass and Atlantic sturgeon in the US Southern Mid-Atlantic Bight flyway

Seasonal migrations are key to the production and persistence of marine fish populations but movements within shelf movement corridors or, "flyways", are poorly known. Atlantic sturgeon and striped bass, two anadromous species of concern, are known for their extensive migrations along the US Middle-Atlantic Bight. Seasonal patterns of habitat selection are well described within spawning rivers, estuaries, and shelf foraging habitats, but information on the location and timing of key coastal migrations is limited. Using a gradient-based array of acoustic telemetry receivers, we compared the seasonal incidence and movement behavior of these species in the near-shelf region of Maryland, USA. Atlantic sturgeon incidence was highest in the spring and fall and tended to be biased toward shallow regions, while striped bass had increased presence during spring and winter months and selected deeper waters. Incidence was transient (mean = ~2 d) for both species with a pattern of increased residency (> 2 d) during autumn and winter, particularly for striped bass, with many individuals exhibiting prolonged presence on the outer shelf during winter. Flyways also differed spatially between northern and southern migrations for both species and were related to temperature: striped bass were more likely to occur in cool conditions while Atlantic sturgeon preferred warmer temperatures. Observed timing and spatial distribution within the Middle-Atlantic flyway were dynamic between years and sensitive to climate variables. As shelf ecosystems come under increasing maritime development, gridded telemetry designs represent a feasible approach to provide impact responses within key marine flyways like those that occur within the US Middle-Atlantic Bight.

opencc-zeroAug 2022View details →

Shell colour diversification induced by ecological release: a shift in natural selection after a migration event

Ecological release is often attributed to the rapid adaptive diversification of phenotypic traits. However, it is not well understood how natural selection changes its strength and direction through the process of ecological release. Herein, we demonstrated how shell colour of the Japanese land snail Euhadra peliomphala simodae has diversified via a shift in natural selection due to ecological release after migration from the mainland to an island. This snail's shell colour diversified on the island due to disruptive selection after migration from the mainland. We used trail-camera traps to identify the cause of natural selection on both the mainland and island. We then conducted a mark-recapture experiment while collecting microhabitat use data. In total, we captured and marked around 1700 snails on the mainland, some of which were preyed upon by an unknown predator. The trail-camera traps showed that the predator is the large Japanese field mouse Apodemus speciosus, and the predatory frequency was higher on the mainland than on the island. However, this predation did not correlate with shell colour. Microhabitat use on the island was more extensive than on the mainland, with snails on the island using both ground and arboreal microhabitats. A Bayesian estimation showed that the stabilising selection on shell colour came from factors other than predation. Our results suggest that the course of natural selection was modified due to ecological release after migration from the mainland, explaining one cause of the phenotypic diversification.

opencc-zeroApr 2024View details →

Data from: Dine and dash: How trophic ecology and migration shape functional locomotory traits in Clupeiform fishes

Understanding how interactions between multiple selective forces influence traits at the macroevolutionary scale is key to understanding adaptive landscapes. Diadromy, an extreme form of migration between marine and freshwater environments, is thought to require locomotory traits conducive to long-distance migration. Yet, other selective forces, such as predator avoidance, habitat use, and prey acquisition, are also likely to shape locomotory adaptation in fishes. We examined how diadromy and trophic ecology together influenced locomotory trait diversity across Clupeiformes, a clade of fishes containing high trophic diversity and numerous transitions to diadromy. We found that both diadromy and trophic ecology influenced the pattern and pace of trait evolution. Diadromous taxa rapidly evolved traits characterized by high cruising efficiency, but the extent to which diadromous and non-diadromous taxa differed depended on their trophic ecology. Macropredators showed greater differences in locomotory traits between diadromous and non-diadromous taxa than phytodetritivores and micropredators, suggesting that traits conducive to migration might be most costly to consumers of evasive prey. This work shows that simultaneously characterizing the roles of multiple ecological or life-history factors in phenotypic evolution can bring the topography of adaptive landscapes into sharper focus and provide a more holistic view of the forces driving patterns of trait evolution.