Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Tu... more Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Turtles Eretmochelys imbricate nesting at Milman Island, northern Great Barrier Reef, Australia. This information describes gonadal hormone concentration during the Austral summer months for peak nesting in an E. imbricata population that nest year-round. A total of 173 samples was collected from 95 turtles, with 39 turtles sampled sequentially within their nesting cycle (n = 117 samples) and the remainder sampled at random. E2 -levels were measured from seven turtles sampled sequentially within their nesting cycle (n = 31 samples). T-Ievels ranged from 0 to 7 520 pg/ml; E2-Ieveis varied between 0.0 and 119.0 pg/ml. Peak T-Ievels in turtles sampled sequentially within their nesting cycle occurred after laying clutch number two or three while E2-levels peaked after clutch number one or two; levels of both hormones decreased thereafter. T- and E2-levels decreased monthly (December to March) within a nesting season. Based on T-Ievels, the greatest proportion (58%) of turtles began their nesting cycle in December. Turtles in the middle of their nesting cycle were found in equal proportions (27?35%) throughout the Austral summer months. Turtles at the end of their nesting cycle were most frequent (61%) in March. The implications of these results for future research and for managing access to islands with year-round marine turtle nesting are discussed.
Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Tu... more Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Turtles Eretmochelys imbricate nesting at Milman Island, northern Great Barrier Reef, Australia. This information describes gonadal hormone concentration during the Austral summer months for peak nesting in an E. imbricata population that nest year-round. A total of 173 samples was collected from 95 turtles, with 39 turtles sampled sequentially within their nesting cycle (n = 117 samples) and the remainder sampled at random. E2 -levels were measured from seven turtles sampled sequentially within their nesting cycle (n = 31 samples). T-Ievels ranged from 0 to 7 520 pg/ml; E2-Ieveis varied between 0.0 and 119.0 pg/ml. Peak T-Ievels in turtles sampled sequentially within their nesting cycle occurred after laying clutch number two or three while E2-levels peaked after clutch number one or two; levels of both hormones decreased thereafter. T- and E2-levels decreased monthly (December to March) within a nesting season. Based on T-Ievels, the greatest proportion (58%) of turtles began their nesting cycle in December. Turtles in the middle of their nesting cycle were found in equal proportions (27?35%) throughout the Austral summer months. Turtles at the end of their nesting cycle were most frequent (61%) in March. The implications of these results for future research and for managing access to islands with year-round marine turtle nesting are discussed.
The marine mammals of the Great Barrier Reef include dugongs, whales and dolphins. This chapter i... more The marine mammals of the Great Barrier Reef include dugongs, whales and dolphins. This chapter is divided into two sections, the first concerning dugongs and the second cetaceans (whales, dolphins and porpoises)
Summary The management of natural resources creates feedbacks between ecosystems and societies, b... more Summary The management of natural resources creates feedbacks between ecosystems and societies, both of which exist at characteristic scales. Theory predicts that sustainability is higher when governance and management scales align with scales of ecological heterogeneity. We analyzed the areas of institutions (10,030 permissions from 7,478 permits in the Great Barrier Reef Marine Park, 2007–2017) and compared these with the areas of reef features and non-reef marine bioregions. Permission extents were bimodal; 72% were fine scale (median 16.5 km2), and 28% were broad scale (median 99,193 km2). Biophysical data were unimodal and at significantly smaller scales than permissions. Different permission scales for different activities indicated adaptability within the permitting system. Our analysis demonstrates a new approach to quantifying scale mismatches. It suggests that discrete institutional scales exist but differ from ecological scales and that rules at broader scales than the managed resource may allow greater adaptation and responsiveness by human users than rules at the same scales.
Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Tu... more Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Turtles Eretmochelys imbricate nesting at Milman Island, northern Great Barrier Reef, Australia. This information describes gonadal hormone concentration during the Austral summer months for peak nesting in an E. imbricata population that nest year-round. A total of 173 samples was collected from 95 turtles, with 39 turtles sampled sequentially within their nesting cycle (n = 117 samples) and the remainder sampled at random. E2 -levels were measured from seven turtles sampled sequentially within their nesting cycle (n = 31 samples). T-Ievels ranged from 0 to 7 520 pg/ml; E2-Ieveis varied between 0.0 and 119.0 pg/ml. Peak T-Ievels in turtles sampled sequentially within their nesting cycle occurred after laying clutch number two or three while E2-levels peaked after clutch number one or two; levels of both hormones decreased thereafter. T- and E2-levels decreased monthly (December to March) within a nesting season. Based on T-Ievels, the greatest proportion (58%) of turtles began their nesting cycle in December. Turtles in the middle of their nesting cycle were found in equal proportions (27?35%) throughout the Austral summer months. Turtles at the end of their nesting cycle were most frequent (61%) in March. The implications of these results for future research and for managing access to islands with year-round marine turtle nesting are discussed.
Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Tu... more Serum testosterone (T) and estradiol-17� (E2 ) concentrations were determined for 95 Hawksbill Turtles Eretmochelys imbricate nesting at Milman Island, northern Great Barrier Reef, Australia. This information describes gonadal hormone concentration during the Austral summer months for peak nesting in an E. imbricata population that nest year-round. A total of 173 samples was collected from 95 turtles, with 39 turtles sampled sequentially within their nesting cycle (n = 117 samples) and the remainder sampled at random. E2 -levels were measured from seven turtles sampled sequentially within their nesting cycle (n = 31 samples). T-Ievels ranged from 0 to 7 520 pg/ml; E2-Ieveis varied between 0.0 and 119.0 pg/ml. Peak T-Ievels in turtles sampled sequentially within their nesting cycle occurred after laying clutch number two or three while E2-levels peaked after clutch number one or two; levels of both hormones decreased thereafter. T- and E2-levels decreased monthly (December to March) within a nesting season. Based on T-Ievels, the greatest proportion (58%) of turtles began their nesting cycle in December. Turtles in the middle of their nesting cycle were found in equal proportions (27?35%) throughout the Austral summer months. Turtles at the end of their nesting cycle were most frequent (61%) in March. The implications of these results for future research and for managing access to islands with year-round marine turtle nesting are discussed.
The marine mammals of the Great Barrier Reef include dugongs, whales and dolphins. This chapter i... more The marine mammals of the Great Barrier Reef include dugongs, whales and dolphins. This chapter is divided into two sections, the first concerning dugongs and the second cetaceans (whales, dolphins and porpoises)
Summary The management of natural resources creates feedbacks between ecosystems and societies, b... more Summary The management of natural resources creates feedbacks between ecosystems and societies, both of which exist at characteristic scales. Theory predicts that sustainability is higher when governance and management scales align with scales of ecological heterogeneity. We analyzed the areas of institutions (10,030 permissions from 7,478 permits in the Great Barrier Reef Marine Park, 2007–2017) and compared these with the areas of reef features and non-reef marine bioregions. Permission extents were bimodal; 72% were fine scale (median 16.5 km2), and 28% were broad scale (median 99,193 km2). Biophysical data were unimodal and at significantly smaller scales than permissions. Different permission scales for different activities indicated adaptability within the permitting system. Our analysis demonstrates a new approach to quantifying scale mismatches. It suggests that discrete institutional scales exist but differ from ecological scales and that rules at broader scales than the managed resource may allow greater adaptation and responsiveness by human users than rules at the same scales.
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