High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990
Abundance of Kemp’s ridley sea turtle Lepidochelys kempii Garman, 1880 in the Northwest Atlantic Ocean (NWA) is far less than in the Gulf of Mexico (GOM), but encounters of this species in the NWA have increased in recent decades. Consequently, improved opportunity exists to evaluate population stru...
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ftdoajarticles:oai:doaj.org/article:5a5e0112fc014770ade96218843277b9 2023-05-15T17:45:34+02:00 High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 MD Arendt RP Webster JA Schwenter 2022-07-01T00:00:00Z https://doi.org/10.3354/esr01190 https://doaj.org/article/5a5e0112fc014770ade96218843277b9 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v48/p107-121/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01190 https://doaj.org/article/5a5e0112fc014770ade96218843277b9 Endangered Species Research, Vol 48, Pp 107-121 (2022) Zoology QL1-991 Botany QK1-989 article 2022 ftdoajarticles https://doi.org/10.3354/esr01190 2022-12-31T00:26:17Z Abundance of Kemp’s ridley sea turtle Lepidochelys kempii Garman, 1880 in the Northwest Atlantic Ocean (NWA) is far less than in the Gulf of Mexico (GOM), but encounters of this species in the NWA have increased in recent decades. Consequently, improved opportunity exists to evaluate population structure, which is of particular interest given suggestions of renewed decline in annual survival rates in the GOM. Here we use size structure for Kemp’s ridley sea turtles captured (n = 617) by research trawling in the South Atlantic Bight (SAB) to assess survival since 1990 following age assignment using recently published size-at-age keys. With limited exception, the ratio of older (≥age 10) to younger (ages 1 to 9) sea turtles captured randomly was overwhelmingly stable and best aligned with high (≥0.9) annual neritic survival in theoretical models with fixed annual hatchling (H) recruitment. When annual H recruitment reflected exponential increase in H production since 1985, following low and generally stable production between 1966 and 1984, reduced H emigration proportion from the GOM to NWA and further increase in annual neritic survival were required to achieve the size/age structure reported for in-water data. Stepwise regression using monthly values for 5 climate indices simulated (adj. r2 = 0.77) proportionate annual H decline, which better explained observed survey size/age structure than climate-based prediction (adj. r2 = 1.00) of published particle emigration rates. Temporal decline in proportionate H recruitment to the NWA should increase retention of juveniles in the GOM to further enhance multi-generational population rebuilding. Article in Journal/Newspaper Northwest Atlantic Directory of Open Access Journals: DOAJ Articles Endangered Species Research 48 107 121 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Zoology QL1-991 Botany QK1-989 |
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Zoology QL1-991 Botany QK1-989 MD Arendt RP Webster JA Schwenter High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
Abundance of Kemp’s ridley sea turtle Lepidochelys kempii Garman, 1880 in the Northwest Atlantic Ocean (NWA) is far less than in the Gulf of Mexico (GOM), but encounters of this species in the NWA have increased in recent decades. Consequently, improved opportunity exists to evaluate population structure, which is of particular interest given suggestions of renewed decline in annual survival rates in the GOM. Here we use size structure for Kemp’s ridley sea turtles captured (n = 617) by research trawling in the South Atlantic Bight (SAB) to assess survival since 1990 following age assignment using recently published size-at-age keys. With limited exception, the ratio of older (≥age 10) to younger (ages 1 to 9) sea turtles captured randomly was overwhelmingly stable and best aligned with high (≥0.9) annual neritic survival in theoretical models with fixed annual hatchling (H) recruitment. When annual H recruitment reflected exponential increase in H production since 1985, following low and generally stable production between 1966 and 1984, reduced H emigration proportion from the GOM to NWA and further increase in annual neritic survival were required to achieve the size/age structure reported for in-water data. Stepwise regression using monthly values for 5 climate indices simulated (adj. r2 = 0.77) proportionate annual H decline, which better explained observed survey size/age structure than climate-based prediction (adj. r2 = 1.00) of published particle emigration rates. Temporal decline in proportionate H recruitment to the NWA should increase retention of juveniles in the GOM to further enhance multi-generational population rebuilding. |
format |
Article in Journal/Newspaper |
author |
MD Arendt RP Webster JA Schwenter |
author_facet |
MD Arendt RP Webster JA Schwenter |
author_sort |
MD Arendt |
title |
High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
title_short |
High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
title_full |
High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
title_fullStr |
High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
title_full_unstemmed |
High annual survival suggested by size structure of Kemp’s ridley sea turtles captured by coastal research trawling in the Northwest Atlantic Ocean since 1990 |
title_sort |
high annual survival suggested by size structure of kemp’s ridley sea turtles captured by coastal research trawling in the northwest atlantic ocean since 1990 |
publisher |
Inter-Research |
publishDate |
2022 |
url |
https://doi.org/10.3354/esr01190 https://doaj.org/article/5a5e0112fc014770ade96218843277b9 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Endangered Species Research, Vol 48, Pp 107-121 (2022) |
op_relation |
https://www.int-res.com/abstracts/esr/v48/p107-121/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01190 https://doaj.org/article/5a5e0112fc014770ade96218843277b9 |
op_doi |
https://doi.org/10.3354/esr01190 |
container_title |
Endangered Species Research |
container_volume |
48 |
container_start_page |
107 |
op_container_end_page |
121 |
_version_ |
1766148687882354688 |