Ontogenetic patterns in juvenile blue crab density: effects of habitat and turbidity in a Chesapeake Bay tributary DOI Creative Commons
A. Challen Hyman, Grace S. Chiu,

MS Seebo

и другие.

Marine Ecology Progress Series, Год журнала: 2023, Номер 729, С. 135 - 150

Опубликована: Ноя. 30, 2023

Nursery habitats are characterized by favorable conditions for juveniles, including higher food availability and lower predation risk, disproportionately contribute more individuals per unit area to adult populations compared other habitats. However, nursery habitat inference is complicated changes in preferences with ontogeny; early-life stages frequently inhabit different than older juveniles or adults. In this field experiment, we modeled the density of 4 size classes juvenile blue crabs Callinectes sapidus based on carapace width (CW) across multiple at various locations within an estuarine seascape during crab recruitment season. We examined types—unstructured sand, seagrass meadows, salt marsh edges (SME), shallow detrital (SDH). Results indicated that densities small (≤10 mm CW) were highest seagrass, whereas larger (16-25 SME. Although declined as a function size, SME remained consistently high, suggesting secondary dispersal smaller after settlement may supplement losses due mortality. Turbidity was positively correlated both classes, although our model did not address whether top-down (refuge) bottom-up (food availability) mechanisms. Observed patterns size-specific utilization result from changing requirements animals minimize mortality-to-growth ratios. Our findings emphasize role ontogeny significance structurally complex supporting sizes previously recognized, challenging past notions about singular importance system. also underscore need quantify preserve complete chain used juveniles.

Язык: Английский

Assessment of treatment-specific tethering survival bias for the juvenile blue crab Callinectes sapidus in a simulated salt marsh DOI Creative Commons
Cole R. Miller, A. Challen Hyman, Daniel Shi

и другие.

PLoS ONE, Год журнала: 2023, Номер 18(10), С. e0289398 - e0289398

Опубликована: Окт. 23, 2023

The blue crab (Callinectes sapidus) is ecologically and economically important in Chesapeake Bay. Nursery habitats, such as seagrass beds, disproportionately contribute individuals to the adult segment of populations. Salt marshes dominated by smooth cordgrass Spartina alterniflora are intertidal nursery habitats which may serve a refuge from predation for juvenile crabs. However, effects various characteristics salt on metrics, survival, have not been quantified. Comparisons survival between other often employ tethering assess survival. Although experimental bias when prey well recognized, potential habitat-specific has experimentally tested. Using short-term mesocosm experiments, we tested if simulated marsh produces bias. Juvenile crabs were tethered or un-tethered randomly allocated mesocosms at varying shoot densities unstructured sand. Tethering reduced its effect was habitat specific, irrespective density, evidenced non-significant interaction treatment habitat. Thus, did produce treatment-specific relative unvegetated across range densities; positively related density. These findings indicate that useful method assessing marshes, with including algae

Язык: Английский

Процитировано

2
Effects of structural complexity and water depth on the juvenile blue crabCallinectes Sapidusin a simulated salt marsh mesocosm DOI Creative Commons
A. Challen Hyman, Cole R. Miller, Daniel Shi

и другие.

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

Опубликована: Янв. 23, 2023

The blue crab ( Callinectes sapidus ) is ecologically and economically important in Chesapeake Bay. Nursery habitats, which disproportionately contribute individuals to the adult segment of populations, are essential population dynamics. Spartina alterniflora salt marshes productive but fragmented intertidal nursery habitats may serve as a refuge from predation for juvenile crabs. However, effects various characteristics on metrics, such survival, have not been quantified. Using mesocosm experiments, we examined shoot density water depth survival using crabs predators. Survival increased significantly with density, whereas did affect survival. Thus, contrast several previous studies, influence crabs, possibly due different environmental conditions prior studies. These findings indicate that marsh structural complexity enhances beneficial effect shallow differs by conditions.

Язык: Английский

Процитировано

1
Ontogenetic Patterns in Juvenile Blue Crab density: Effects of Habitat and Turbidity in a Chesapeake Bay Tributary DOI Creative Commons
A. Challen Hyman, Grace S. Chiu,

Michael S. Seebo

и другие.

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

Опубликована: Июнь 7, 2023

Nursery habitats are characterized by favorable conditions for juveniles, such as higher food availability and lower predation risk, dispropor-tionately contribute more individuals per unit area to adult segments of the population compared other habitats. However, nursery habitat inference is complicated changes in preferences with ontogeny; early-life stages frequently inhabit different than older juveniles or adults. In this mensurative field experiment, we modeled density two juvenile blue crab, Callinectes sapidus , size classes based on carapace width (CW) across multiple at various locations within an estuarine seascape during crab recruitment season. We examined four habi-tat types—unstructured sand, seagrass meadows, salt marsh edge (SME), shallow detrital (SDH). Results indicated that densities small ju-venile crabs ( ≤ 15 mm CW) were highest seagrass, whereas larger (16–30 SME. Densities large SME also greater those suggest-ing possible secondary dispersal after settlement seagrass. Turbidity was positively correlated densi-ties both classes, although our model did not address whether due top-down (refuge) bottom-up (food availability) mechanisms. Ob-served patterns size-specific utilization may result from changing requirements size, animals minimize mortality-to-growth ratios. Taken together previous work observed SME, these findings emphasize role juve-nile ontogeny underscore need quantify preserve complete chain used juveniles.

Язык: Английский

Процитировано

1
Model-based evaluation of critical nursery habitats for juvenile blue crabs through ontogeny: abundance and survival in seagrass, salt marsh, and unstructured bottom DOI Creative Commons
A. Challen Hyman, Grace S. Chiu,

Michael S. Seebo

и другие.

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

Опубликована: Июль 23, 2023

Nursery habitats confer higher food availability and reduced predation risk, thereby contributing disproportionately more individuals per unit area to the population compared with other habitats. status is inferred through evaluation of four metrics: density, growth, survival, linkage between juveniles adults. Moreover, organisms commonly use multiple as nurseries throughout ontogeny satisfy shifting resource requirements. To this end, we conducted manipulative mensurative field experiments evaluate two nursery metrics, abundance for juvenile blue crabs across size classes habitats, including structurally complex — seagrass meadows salt marshes unstructured habitat (sand flats) in York River, Chesapeake Bay. We also considered effects site-specific spatial orientation within seasonality, physicochemical variables, postlarval influx. Our results showed that was both relative sand, positively associated turbidity post-larval abundance. Notably, harbored highest abundances small ( ≤ 15 mm carapace width) juveniles, whereas marsh edge medium (16–30 large (31– 60 juveniles. survival unvegetated controls. Seasonally, peaked April, reached a seasonal minimum August, increased fall. Finally, habitat-specific dependent on position: elevated at upriver sand downriver counterparts. In marine species, ontogenetic shifts has typically focused relatively broad ranges phase. Yet, may occur much narrower ranges, which not been well studied critical conservation restoration found utilization rates differed by class over surprisingly narrow range size, were related (1) structural biological characteristics nominal (2) gradients environmental variables tributary, (3) likely trade-offs growth ontogeny. Taken together, indicate are key primarily early-stage an intermediate larger maximize growth-to-mortality ratios. underscore need consider

Язык: Английский

Процитировано

0
Ontogenetic patterns in juvenile blue crab density: effects of habitat and turbidity in a Chesapeake Bay tributary DOI Creative Commons
A. Challen Hyman, Grace S. Chiu,

MS Seebo

и другие.

Marine Ecology Progress Series, Год журнала: 2023, Номер 729, С. 135 - 150

Опубликована: Ноя. 30, 2023

Nursery habitats are characterized by favorable conditions for juveniles, including higher food availability and lower predation risk, disproportionately contribute more individuals per unit area to adult populations compared other habitats. However, nursery habitat inference is complicated changes in preferences with ontogeny; early-life stages frequently inhabit different than older juveniles or adults. In this field experiment, we modeled the density of 4 size classes juvenile blue crabs Callinectes sapidus based on carapace width (CW) across multiple at various locations within an estuarine seascape during crab recruitment season. We examined types—unstructured sand, seagrass meadows, salt marsh edges (SME), shallow detrital (SDH). Results indicated that densities small (≤10 mm CW) were highest seagrass, whereas larger (16-25 SME. Although declined as a function size, SME remained consistently high, suggesting secondary dispersal smaller after settlement may supplement losses due mortality. Turbidity was positively correlated both classes, although our model did not address whether top-down (refuge) bottom-up (food availability) mechanisms. Observed patterns size-specific utilization result from changing requirements animals minimize mortality-to-growth ratios. Our findings emphasize role ontogeny significance structurally complex supporting sizes previously recognized, challenging past notions about singular importance system. also underscore need quantify preserve complete chain used juveniles.

Язык: Английский

Процитировано

0