Environmental DNA reveals fine scale spatial and temporal variation of prey species for marine mammals in a Scottish marine protected area DOI Creative Commons
Elizabeth Boyse, Kevin P. Robinson, Maria Beger

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Дек. 23, 2023

Abstract Marine mammal foraging grounds are popular focal points for marine protected area (MPA) implementation, but may be temporally dynamic, requiring continuous monitoring to infer prey availability and abundance. distributions assumed driven by their in areas, limited understanding of often prevents us from exploring how shifting impacts both seasonal long-term distributions. Environmental DNA (eDNA) metabarcoding could enhance habitat use relation through simultaneous both. However, eDNA applications focused on mammals or predator-prey dynamics have been date. In this study, we assess spatiotemporal changes the abundance minke whale ( Balaenoptera acutorostrata ) species a newly established MPA, employing metabarcoding. We recovered 105 molecular operational taxonomic units (OTUs) vertebrates using two primer sets targeting 12S 16S genes, along with 112 OTUs broader eukaryotic set 18S rRNA. Overall, key forage fish species, sandeels clupeids, were most abundant teleost fishes detected, although varied distance shore. also found clear spatial partitioning between coastal bottlenose dolphins more pelagic whales harbour porpoises, paralleling main species. Other conservation interest detected including critically endangered European eel Anguilla anguilla ), blue fin tuna Thunnus thynnus invasive pink salmon Oncorhynchus gorbuscha ). This study demonstrates application detect trends occurrence cetacean predators prey, furthering our fine-scale within MPAs. Future, improve ability predict climate-induced shifts rapid responses appropriate management actions.

Язык: Английский

Humpback-krill relationships are strongest at fine spatial scales in the Northern California Current region DOI Creative Commons
Rachel L Kaplan, Solène Derville,

KS Bernard

и другие.

Marine Ecology Progress Series, Год журнала: 2024, Номер 729, С. 219 - 232

Опубликована: Янв. 4, 2024

Understanding scale-dependent variability in predator-prey relationships is essential to ecosystem management. The Northern California Current (NCC) an important foraging ground for humpback ( Megaptera novaengliae ) and other rorqual whales, but it also area that presents diverse anthropogenic threats. Clarifying the most meaningful spatial scale analyze between whales krill, a key prey item, understanding function informing research management efforts. To examine spatially explicit krill NCC, we analyzed concurrent whale sightings acoustically detected abundance estimates collected May September 2018 2022. We used generalized additive mixed models predict occurrence at series of ecologically relevant nested scales: 1, 2, 5, 20 km. found relative 5 km had greatest influence on occurrence. Our results suggest may be both energetically profitable optimize efficiency detectable using our traditional methodological approaches (paired observer echosounder surveys). recommend zooplankton data incorporated into future distribution considered applications this region.

Язык: Английский

Процитировано

5
Environmental DNA reveals fine‐scale spatial and temporal variation of marine mammals and their prey species in a Scottish marine protected area DOI Creative Commons
Elizabeth Boyse, Kevin P. Robinson, Maria Beger

и другие.

Environmental DNA, Год журнала: 2024, Номер 6(4)

Опубликована: Июль 1, 2024

Abstract Marine mammal foraging grounds are popular focal points for marine protected area (MPA) implementation, despite being temporally dynamic, requiring continuous monitoring to infer prey availability and abundance. distributions assumed be driven by their in areas, but limited understanding of often prevents us from exploring how shifting impacts both seasonal long‐term distributions. Environmental DNA (eDNA) metabarcoding could enhance the habitat use relation through simultaneous both. However, eDNA applications focused on mammals or predator–prey dynamics have been date. In this study, we assess spatiotemporal changes distribution abundance cetaceans, minke whales ( Balaenoptera acutorostrata ), bottlenose dolphins Tursiops truncatus ) harbor porpoises Phocoena phocoena key species a newly established MPA, employing metabarcoding. We recovered 105 molecular operational taxonomic units (OTUs) vertebrates using two primer sets targeting 12S 16S genes, along with 112 OTUs broader eukaryotic set 18S rRNA. Overall, forage fish species, sandeels clupeids, were most abundant teleost fishes detected, although varied distance shore. also found clear spatial partitioning between coastal more pelagic porpoises, paralleling main species. Other conservation interest detected including critically endangered European eel Anguilla anguilla Atlantic bluefin tuna Thunnus thynnus invasive pink salmon Oncorhynchus gorbuscha ). This study demonstrates application detect trends occurrence cetacean predators prey, furthering our fine‐scale within MPAs. Future improve ability predict climate‐induced shifts rapid responses appropriate management actions.

Язык: Английский

Процитировано

5
Trophoscapes of predatory fish reveal biogeographic structuring of spatial dietary overlap and inform fisheries bycatch patterns DOI

BK Wells,

JA Santora,

JJ Bizzarro

и другие.

Marine Ecology Progress Series, Год журнала: 2023, Номер 741, С. 47 - 70

Опубликована: Май 15, 2023

Trophic interactions are proximate drivers of ecosystem function, including predator-prey dynamics, and their spatio-temporal variability may reflect shifts changes in trophic transfer. We investigated biogeographic structuring by analyzing multi-decadal time series diet for Pacific hake Merluccius productus Chinook salmon Oncorhynchus tshawytscha from a large marine ecosystem. compared our predictions trophoscapes (i.e. spatially explicit relationships) to inform dynamics fishery bycatch patterns. have 3 inter-related findings pertaining the spatial coherence potential consequences juvenile sub-adult after first year at sea but prior maturation) when sharing foraging areas with hake. First, scale represents coastwide variability, diets differs across regions demonstrates broad diet. Second, expectation increased overlap during low productivity periods (e.g. krill biomass, suboptimal upwelling) can management challenges. In this regard, we explore role shared habitats on predation, consequentially reduced recruitment, sub-optimal upwelling conditions. Third, show that above-average was associated later spring transition, potentially as result both prey species shelf break.

Язык: Английский

Процитировано

8
The migratory whale herd concept: A novel unit to conserve under the ecological paradigm DOI Creative Commons
Karen K. Martien, Barbara L. Taylor, Aimée R. Lang

и другие.

Marine Mammal Science, Год журнала: 2023, Номер 39(4), С. 1267 - 1292

Опубликована: Май 10, 2023

Abstract Photographic and genetic studies have revealed the complex population structure of migratory large whales. Most research management are geographically based, focusing on either wintering or summering areas, which in most cases fails to capture this complexity. We use examples from humpback whales ( Megaptera novaeangliae ) gray Eschrichtius robustus illustrate concept herds, defined here as conspecific that migrate between same feeding ground. In where individuals show strong fidelity both grounds, therefore a herd, dispersal herds can be low enough render them demographically independent populations, dynamics determined more by net internal recruitment (births minus deaths) than immigration outside sources. these cases, whale herd is appropriate unit conserve under ecological paradigm focuses groups united demographic forces. suggest when addressing questions focused timescales for species with destinations, better initial working hypothesis rather one based strata.

Язык: Английский

Процитировано

5
Environmental variability and krill abundance in the central California current: Implications for ecosystem monitoring DOI Creative Commons
Jeffrey G. Dorman, William J. Sydeman, Sarah Thompson

и другие.

Frontiers in Marine Science, Год журнала: 2023, Номер 10

Опубликована: Март 22, 2023

Krill are a direct conduit between primary productivity and recreationally commercially important higher trophic level species globally. Determining how krill abundance varies with temporal environmental variation is key to understanding their function in coastal-pelagic food webs, as well applications fisheries management. We used nine years (2012–19 2021) of late spring/early summer hydroacoustic-trawl survey data the California Current Ecosystem (CCE), coupled new target strength models two ( Euphausia pacifica Thysanoessa spinifera ), investigate adult biomass varied during decade unusual ocean climate variability. estimate mean 1.75–2.0 million metric tons on central northern continental shelf. Overall, relative was ~30% lower 2015 2016, corresponding major warming event, 2013 2018, exceptionally strong upwelling. Variation related prior year’s conditions derived from our seasonal Multivariate Ocean Climate Index (MOCI), E. T. showed similar covariation study period. Biomass co-varied at different spatial scales across sampling devices, suggesting that multiple indicators (and dispersion) available should be applied ecosystem monitoring modeling krill-dependent predators ecosystem.

Язык: Английский

Процитировано

4
Genetic data reveal wintering ground affiliation of humpback whales from the Mexican Central Pacific DOI Open Access
Myriam Llamas‐González, Christian D. Ortega‐Ortiz, Luis Manuel Enríquez‐Paredes

и другие.

Marine Mammal Science, Год журнала: 2023, Номер 40(1), С. 54 - 72

Опубликована: Июль 30, 2023

ABSTRACT Two groups of humpback whales inhabit the waters off Pacific coast Mexico coastal wintering aggregation in north (MX), and southern Mexico/Central America (S‐MX/CEA) south. However, along Mexican Central (MCP), population affiliation is uncertain. Some studies have concluded that MCP are part S‐MX/CEA, while others suggested may represent an overlap zone between two aggregations. In this study, data from 354 biopsy samples were collected over a 12‐year period, to provide insight genetic information into boundaries Using mitochondrial control region sequences, we found majority (73%) MX, but boundary aggregations shift latitudinally depending on environmental conditions. The high haplotypic ( h ± SD = 0.859 0.0138) nucleotide diversity (π 0.0145 0.0075) also consistent with our sample, including animals both More research needed better describe ranges MX S‐MX/CEA ensure their successful conservation management.

Язык: Английский

Процитировано

2
Environmental DNA reveals fine scale spatial and temporal variation of prey species for marine mammals in a Scottish marine protected area DOI Creative Commons
Elizabeth Boyse, Kevin P. Robinson, Maria Beger

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Дек. 23, 2023

Abstract Marine mammal foraging grounds are popular focal points for marine protected area (MPA) implementation, but may be temporally dynamic, requiring continuous monitoring to infer prey availability and abundance. distributions assumed driven by their in areas, limited understanding of often prevents us from exploring how shifting impacts both seasonal long-term distributions. Environmental DNA (eDNA) metabarcoding could enhance habitat use relation through simultaneous both. However, eDNA applications focused on mammals or predator-prey dynamics have been date. In this study, we assess spatiotemporal changes the abundance minke whale ( Balaenoptera acutorostrata ) species a newly established MPA, employing metabarcoding. We recovered 105 molecular operational taxonomic units (OTUs) vertebrates using two primer sets targeting 12S 16S genes, along with 112 OTUs broader eukaryotic set 18S rRNA. Overall, key forage fish species, sandeels clupeids, were most abundant teleost fishes detected, although varied distance shore. also found clear spatial partitioning between coastal bottlenose dolphins more pelagic whales harbour porpoises, paralleling main species. Other conservation interest detected including critically endangered European eel Anguilla anguilla ), blue fin tuna Thunnus thynnus invasive pink salmon Oncorhynchus gorbuscha ). This study demonstrates application detect trends occurrence cetacean predators prey, furthering our fine-scale within MPAs. Future, improve ability predict climate-induced shifts rapid responses appropriate management actions.

Язык: Английский

Процитировано

1